文档修改

doc/6.txt

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-12

src/androidTest/java/net/micode/notes/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package net.micode.notes;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("net.micode.notes", appContext.getPackageName());
+    }
+}

src/main/AndroidManifest.xml

@@ -0,0 +1,157 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.READ_CONTACTS" />
+    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
+    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
+    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
+    <uses-permission android:name="android.permission.USE_CREDENTIALS" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Notesmaster"
+        tools:targetApi="31">
+        <activity
+            android:name=".ui.NotesListActivity"
+            android:configChanges="keyboardHidden|orientation|screenSize"
+            android:label="@string/app_name"
+            android:launchMode="singleTop"
+            android:theme="@style/NoteTheme"
+            android:uiOptions="splitActionBarWhenNarrow"
+            android:windowSoftInputMode="adjustPan"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+
+        <activity
+            android:name=".ui.NoteEditActivity"
+            android:configChanges="keyboardHidden|orientation|screenSize"
+            android:launchMode="singleTop"
+            android:theme="@style/NoteTheme"
+            android:exported="true">
+
+            <intent-filter >
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="vnd.android.cursor.item/text_note" />
+                <data android:mimeType="vnd.android.cursor.item/call_note" />
+            </intent-filter >>
+
+            <intent-filter >
+                <action android:name="android.intent.action.INSERT_OR_EDIT" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="vnd.android.cursor.item/text_note" />
+                <data android:mimeType="vnd.android.cursor.item/call_note" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.SEARCH" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.app.searchable"
+                android:resource="@xml/searchable" />
+        </activity>
+
+
+        <provider
+            android:name="net.micode.notes.data.NotesProvider"
+            android:authorities="micode_notes"
+            android:multiprocess="true" />
+
+        <receiver
+            android:name=".widget.NoteWidgetProvider_2x"
+            android:label="@string/app_widget2x2"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+                <action android:name="android.appwidget.action.APPWIDGET_DELETED" />
+
+
+                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_2x_info" />
+        </receiver>
+        <receiver
+            android:name=".widget.NoteWidgetProvider_4x"
+            android:label="@string/app_widget4x4"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+                <action android:name="android.appwidget.action.APPWIDGET_DELETED" />
+                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_4x_info" />
+        </receiver>
+
+        <receiver android:name=".ui.AlarmInitReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+
+        <receiver
+            android:name="net.micode.notes.ui.AlarmReceiver"
+            android:process=":remote" >
+        </receiver>
+
+        <activity
+            android:name=".ui.AlarmAlertActivity"
+            android:label="@string/app_name"
+            android:launchMode="singleInstance"
+            android:theme="@android:style/Theme.Holo.Wallpaper.NoTitleBar" >
+        </activity>
+
+        <activity
+            android:name="net.micode.notes.ui.NotesPreferenceActivity"
+
+
+            android:label="@string/preferences_title"
+            android:launchMode="singleTop"
+            android:theme="@android:style/Theme.Holo.Light" >
+        </activity>
+
+        <service
+            android:name="net.micode.notes.gtask.remote.GTaskSyncService"
+            android:exported="false" >
+        </service>
+
+        <meta-data
+            android:name="android.app.default_searchable"
+            android:value=".ui.NoteEditActivity" />
+
+        <!--        <activity-->
+        <!--            android:name=".MainActivity"-->
+        <!--            android:exported="true">-->
+        <!--            <intent-filter>-->
+        <!--                <action android:name="android.intent.action.MAIN" />-->
+
+        <!--                <category android:name="android.intent.category.LAUNCHER" />-->
+        <!--            </intent-filter>-->
+        <!--        </activity>-->
+
+    </application>
+
+</manifest>

src/main/java/net/micode/notes/MainActivity.java

@@ -0,0 +1,41 @@
+
+package net.micode.notes;
+
+/**
+ * 笔记应用的主活动类，作为应用的入口点。
+ * <p>
+ * 该类是小米笔记应用的主活动，负责初始化应用界面和处理窗口边距设置。
+ * </p>
+ */
+
+import android.os.Bundle;
+
+import androidx.activity.EdgeToEdge;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+public class MainActivity extends AppCompatActivity {
+
+    /**
+     * 活动创建时调用的方法，初始化应用界面和窗口设置。
+     * <p>
+     * 该方法启用了边缘到边缘显示模式，设置了活动布局，并处理了系统栏
+     * 的边距问题，确保内容不会被系统UI遮挡。
+     * </p>
+     * 
+     * @param savedInstanceState 保存的实例状态，用于恢复活动状态
+     */
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+        setContentView(R.layout.activity_main);
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+    }
+}

src/main/java/net/micode/notes/data/Contact.java

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+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.provider.ContactsContract.CommonDataKinds.Phone;
+import android.provider.ContactsContract.Data;
+import android.telephony.PhoneNumberUtils;
+import android.util.Log;
+
+import java.util.HashMap;
+
+/**
+ * 联系人工具类，用于根据电话号码获取联系人姓名
+ * <p>
+ * 该类提供了获取联系人信息的静态方法，并使用缓存机制提高查询效率
+ * </p>
+ */
+public class Contact {
+    /**
+     * 联系人缓存，用于存储已查询过的电话号码和对应联系人姓名
+     */
+    private static HashMap<String, String> sContactCache;
+    /**
+     * 日志标签
+     */
+    private static final String TAG = "Contact";
+
+    /**
+     * 用于查询联系人的选择条件，根据电话号码匹配联系人
+     */
+    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
+    + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
+    + " AND " + Data.RAW_CONTACT_ID + " IN "
+            + "(SELECT raw_contact_id "
+            + " FROM phone_lookup"
+            + " WHERE min_match = '+')";
+
+    /**
+     * 根据电话号码获取联系人姓名
+     * <p>
+     * 该方法会先检查缓存，如果缓存中存在则直接返回，否则查询联系人数据库
+     * </p>
+     * @param context 上下文对象
+     * @param phoneNumber 电话号码
+     * @return 联系人姓名，若未找到则返回null
+     */
+    public static String getContact(Context context, String phoneNumber) {
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,
+                new String [] { Phone.DISPLAY_NAME },
+                selection,
+                new String[] { phoneNumber },
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                String name = cursor.getString(0);
+                sContactCache.put(phoneNumber, name);
+                return name;
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                cursor.close();
+            }
+        } else {
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}

src/main/java/net/micode/notes/data/Notes.java

@@ -0,0 +1,357 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.net.Uri;
+
+/**
+ * 便签应用的核心数据模型类，定义了便签系统的常量、URI和数据结构
+ * <p>
+ * 该类包含了便签应用的核心数据定义，包括便签类型、系统文件夹ID、意图额外参数、
+ * 组件类型、以及各种URI定义。同时还定义了便签表和数据表的列名，以及文本便签和
+ * 通话便签的具体数据结构。
+ * </p>
+ */
+public class Notes {
+    /**
+     * 内容提供者的授权名称，用于构建内容URI
+     */
+    public static final String AUTHORITY = "micode_notes";
+    /**
+     * 日志标签，用于日志输出
+     */
+    public static final String TAG = "Notes";
+    /**
+     * 便签类型：普通便签
+     */
+    public static final int TYPE_NOTE     = 0;
+    /**
+     * 便签类型：文件夹
+     */
+    public static final int TYPE_FOLDER   = 1;
+    /**
+     * 便签类型：系统便签
+     */
+    public static final int TYPE_SYSTEM   = 2;
+
+    /**
+     * 以下是系统文件夹的标识符
+     * {@link Notes#ID_ROOT_FOLDER } 是默认文件夹
+     * {@link Notes#ID_TEMPARAY_FOLDER } 用于存放不属于任何文件夹的便签
+     * {@link Notes#ID_CALL_RECORD_FOLDER} 用于存储通话记录便签
+     */
+    public static final int ID_ROOT_FOLDER = 0;
+    public static final int ID_TEMPARAY_FOLDER = -1;
+    public static final int ID_CALL_RECORD_FOLDER = -2;
+    /**
+     * 回收站文件夹ID，用于存储被删除的便签和文件夹
+     */
+    public static final int ID_TRASH_FOLER = -3;
+
+    /**
+     * 意图额外参数：提醒日期
+     */
+    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
+    /**
+     * 意图额外参数：背景颜色ID
+     */
+    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
+    /**
+     * 意图额外参数：组件ID
+     */
+    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
+    /**
+     * 意图额外参数：组件类型
+     */
+    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
+    /**
+     * 意图额外参数：文件夹ID
+     */
+    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
+    /**
+     * 意图额外参数：通话日期
+     */
+    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";
+
+    /**
+     * 组件类型：无效组件
+     */
+    public static final int TYPE_WIDGET_INVALIDE      = -1;
+    /**
+     * 组件类型：2x2大小的便签组件
+     */
+    public static final int TYPE_WIDGET_2X            = 0;
+    /**
+     * 组件类型：4x4大小的便签组件
+     */
+    public static final int TYPE_WIDGET_4X            = 1;
+
+    /**
+     * 数据类型常量类，定义了不同类型便签的数据项类型
+     */
+    public static class DataConstants {
+        /**
+         * 文本便签的数据项类型
+         */
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
+        /**
+         * 通话便签的数据项类型
+         */
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
+    }
+
+    /**
+     * 用于查询所有便签和文件夹的Uri
+     */
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+
+    /**
+     * 用于查询数据的Uri
+     */
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+
+    public interface NoteColumns {
+        /**
+         * 行的唯一ID
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String ID = "_id";
+
+        /**
+         * 便签或文件夹的父ID
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String PARENT_ID = "parent_id";
+
+        /**
+         * 便签或文件夹的创建日期
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String CREATED_DATE = "created_date";
+
+        /**
+         * 最近修改日期
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String MODIFIED_DATE = "modified_date";
+
+
+        /**
+         * 提醒日期
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String ALERTED_DATE = "alert_date";
+
+        /**
+         * 文件夹名称或便签的文本内容
+         * <P> 类型: TEXT </P>
+         */
+        public static final String SNIPPET = "snippet";
+
+        /**
+         * 便签的组件ID
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String WIDGET_ID = "widget_id";
+
+        /**
+         * 便签的组件类型
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String WIDGET_TYPE = "widget_type";
+
+        /**
+         * 便签的背景颜色ID
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String BG_COLOR_ID = "bg_color_id";
+
+        /**
+         * 对于文本便签，没有附件；对于多媒体便签，至少有一个附件
+         * <P> 类型: INTEGER </P>
+         */
+        public static final String HAS_ATTACHMENT = "has_attachment";
+
+        /**
+         * 文件夹中的便签数量
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String NOTES_COUNT = "notes_count";
+
+        /**
+         * 文件类型：文件夹或便签
+         * <P> 类型: INTEGER </P>
+         */
+        public static final String TYPE = "type";
+
+        /**
+         * 最后同步ID
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String SYNC_ID = "sync_id";
+
+        /**
+         * 表示本地是否修改的标志
+         * <P> 类型: INTEGER </P>
+         */
+        public static final String LOCAL_MODIFIED = "local_modified";
+
+        /**
+         * 移动到临时文件夹之前的原始父ID
+         * <P> 类型: INTEGER </P>
+         */
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+
+        /**
+         * GTask ID
+         * <P> 类型: TEXT </P>
+         */
+        public static final String GTASK_ID = "gtask_id";
+
+        /**
+         * 版本号
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String VERSION = "version";
+    }
+
+    public interface DataColumns {
+        /**
+         * 行的唯一ID
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String ID = "_id";
+
+        /**
+         * 该行表示的项目的MIME类型
+         * <P> 类型: Text </P>
+         */
+        public static final String MIME_TYPE = "mime_type";
+
+        /**
+         * 该数据所属便签的引用ID
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String NOTE_ID = "note_id";
+
+        /**
+         * 便签或文件夹的创建日期
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String CREATED_DATE = "created_date";
+
+        /**
+         * 最近修改日期
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String MODIFIED_DATE = "modified_date";
+
+        /**
+         * 数据内容
+         * <P> 类型: TEXT </P>
+         */
+        public static final String CONTENT = "content";
+
+
+        /**
+         * 通用数据列，含义由{@link # MIMETYPE}决定，用于整数数据类型
+         * <P> 类型: INTEGER </P>
+         */
+        public static final String DATA1 = "data1";
+
+        /**
+         * 通用数据列，含义由{@link # MIMETYPE}决定，用于整数数据类型
+         * <P> 类型: INTEGER </P>
+         */
+        public static final String DATA2 = "data2";
+
+        /**
+         * 通用数据列，含义由{@link # MIMETYPE}决定，用于文本数据类型
+         * <P> 类型: TEXT </P>
+         */
+        public static final String DATA3 = "data3";
+
+        /**
+         * 通用数据列，含义由{@link # MIMETYPE}决定，用于文本数据类型
+         * <P> 类型: TEXT </P>
+         */
+        public static final String DATA4 = "data4";
+
+        /**
+         * 通用数据列，含义由{@link # MIMETYPE}决定，用于文本数据类型
+         * <P> 类型: TEXT </P>
+         */
+        public static final String DATA5 = "data5";
+    }
+
+    public static final class TextNote implements DataColumns {
+        /**
+         * 指示文本是否处于清单模式
+         * <P> 类型: Integer 1:清单模式 0:普通模式 </P>
+         */
+        public static final String MODE = DATA1;
+
+        /**
+         * 清单模式
+         */
+        public static final int MODE_CHECK_LIST = 1;
+
+        /**
+         * 文本便签的目录MIME类型
+         */
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
+
+        /**
+         * 文本便签的单项MIME类型
+         */
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
+
+        /**
+         * 文本便签的内容URI
+         */
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
+    }
+
+    public static final class CallNote implements DataColumns {
+        /**
+         * 此记录的通话日期
+         * <P> 类型: INTEGER (long) </P>
+         */
+        public static final String CALL_DATE = DATA1;
+
+        /**
+         * 此记录的电话号码
+         * <P> 类型: TEXT </P>
+         */
+        public static final String PHONE_NUMBER = DATA3;
+
+        /**
+         * 通话便签的目录MIME类型
+         */
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
+
+        /**
+         * 通话便签的单项MIME类型
+         */
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
+
+        /**
+         * 通话便签的内容URI
+         */
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
+    }
+}

src/main/java/net/micode/notes/data/NotesDatabaseHelper.java

@@ -0,0 +1,432 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.util.Log;
+
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+
+
+/**
+ * 笔记数据库帮助类，负责数据库的创建、升级及触发器管理
+ * 采用单例模式确保数据库连接的唯一性，封装了表结构定义、系统文件夹初始化等核心操作
+ */
+public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    // 数据库文件名
+    private static final String DB_NAME = "note.db";
+    // 数据库版本号，用于升级控制
+    private static final int DB_VERSION = 4;
+
+    /**
+     * 数据库表名常量定义
+     */
+    public interface TABLE {
+        // 笔记表，存储笔记和文件夹的元数据
+        public static final String NOTE = "note";
+        // 数据表，存储笔记的具体内容（如文本、通话记录等）
+        public static final String DATA = "data";
+    }
+
+    // 日志标签
+    private static final String TAG = "NotesDatabaseHelper";
+    // 单例实例
+    private static NotesDatabaseHelper mInstance;
+
+    /**
+     * 笔记表创建SQL语句
+     * 包含笔记/文件夹的基本属性：ID、父文件夹ID、提醒时间、背景色、创建/修改时间等
+     */
+    private static final String CREATE_NOTE_TABLE_SQL =
+            "CREATE TABLE " + TABLE.NOTE + "(" +
+                    NoteColumns.ID + " INTEGER PRIMARY KEY," +
+                    NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+                    NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+                    NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
+                    NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
+                    NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
+                    NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
+                    ")";
+
+    /**
+     * 数据表创建SQL语句
+     * 存储笔记的具体内容，支持多种类型（文本、通话记录等），通过MIME_TYPE区分
+     */
+    private static final String CREATE_DATA_TABLE_SQL =
+            "CREATE TABLE " + TABLE.DATA + "(" +
+                    DataColumns.ID + " INTEGER PRIMARY KEY," +
+                    DataColumns.MIME_TYPE + " TEXT NOT NULL," +
+                    DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+                    NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+                    DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
+                    DataColumns.DATA1 + " INTEGER," +
+                    DataColumns.DATA2 + " INTEGER," +
+                    DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
+                    DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
+                    DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
+                    ")";
+
+    /**
+     * 为数据表的NOTE_ID字段创建索引
+     * 优化根据笔记ID查询数据的性能
+     */
+    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
+            "CREATE INDEX IF NOT EXISTS note_id_index ON " +
+                    TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+
+    /**
+     * 触发器：更新笔记父文件夹时，增加新父文件夹的笔记计数
+     */
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+            "CREATE TRIGGER increase_folder_count_on_update "+
+                    " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+                    " BEGIN " +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+                    "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+                    " END";
+
+    /**
+     * 触发器：更新笔记父文件夹时，减少旧父文件夹的笔记计数
+     */
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+            "CREATE TRIGGER decrease_folder_count_on_update " +
+                    " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+                    " BEGIN " +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+                    "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+                    "  AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
+                    " END";
+
+    /**
+     * 触发器：插入新笔记时，增加其父文件夹的笔记计数
+     */
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
+            "CREATE TRIGGER increase_folder_count_on_insert " +
+                    " AFTER INSERT ON " + TABLE.NOTE +
+                    " BEGIN " +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+                    "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+                    " END";
+
+    /**
+     * 触发器：删除笔记时，减少其父文件夹的笔记计数
+     */
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
+            "CREATE TRIGGER decrease_folder_count_on_delete " +
+                    " AFTER DELETE ON " + TABLE.NOTE +
+                    " BEGIN " +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+                    "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+                    "  AND " + NoteColumns.NOTES_COUNT + ">0;" +
+                    " END";
+
+    /**
+     * 触发器：插入文本笔记数据时，更新对应笔记的摘要内容
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
+            "CREATE TRIGGER update_note_content_on_insert " +
+                    " AFTER INSERT ON " + TABLE.DATA +
+                    " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+                    " BEGIN" +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+                    "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+                    " END";
+
+    /**
+     * 触发器：更新文本笔记数据时，同步更新对应笔记的摘要内容
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
+            "CREATE TRIGGER update_note_content_on_update " +
+                    " AFTER UPDATE ON " + TABLE.DATA +
+                    " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+                    " BEGIN" +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+                    "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+                    " END";
+
+    /**
+     * 触发器：删除文本笔记数据时，清空对应笔记的摘要内容
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
+            "CREATE TRIGGER update_note_content_on_delete " +
+                    " AFTER delete ON " + TABLE.DATA +
+                    " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+                    " BEGIN" +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.SNIPPET + "=''" +
+                    "  WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
+                    " END";
+
+    /**
+     * 触发器：删除笔记时，级联删除其关联的数据记录
+     */
+    private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
+            "CREATE TRIGGER delete_data_on_delete " +
+                    " AFTER DELETE ON " + TABLE.NOTE +
+                    " BEGIN" +
+                    "  DELETE FROM " + TABLE.DATA +
+                    "   WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
+                    " END";
+
+    /**
+     * 触发器：删除文件夹时，级联删除其包含的所有笔记
+     */
+    private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
+            "CREATE TRIGGER folder_delete_notes_on_delete " +
+                    " AFTER DELETE ON " + TABLE.NOTE +
+                    " BEGIN" +
+                    "  DELETE FROM " + TABLE.NOTE +
+                    "   WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+                    " END";
+
+    /**
+     * 触发器：当文件夹被移到回收站时，其包含的所有笔记也自动移到回收站
+     */
+    private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
+            "CREATE TRIGGER folder_move_notes_on_trash " +
+                    " AFTER UPDATE ON " + TABLE.NOTE +
+                    " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+                    " BEGIN" +
+                    "  UPDATE " + TABLE.NOTE +
+                    "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+                    "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+                    " END";
+
+    /**
+     * 私有构造方法，防止外部实例化
+     * @param context 上下文对象
+     */
+    public NotesDatabaseHelper(Context context) {
+        super(context, DB_NAME, null, DB_VERSION);
+    }
+
+    /**
+     * 创建笔记表并初始化相关触发器和系统文件夹
+     * @param db 数据库实例
+     */
+    public void createNoteTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_NOTE_TABLE_SQL);
+        reCreateNoteTableTriggers(db);
+        createSystemFolder(db);
+        Log.d(TAG, "note table has been created");
+    }
+
+    /**
+     * 重新创建笔记表的所有触发器（先删除旧触发器再创建新的）
+     * @param db 数据库实例
+     */
+    private void reCreateNoteTableTriggers(SQLiteDatabase db) {
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
+
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
+        db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
+        db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
+        db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
+    }
+
+    /**
+     * 初始化系统文件夹（通话记录文件夹、根目录、临时文件夹、回收站）
+     * @param db 数据库实例
+     */
+    private void createSystemFolder(SQLiteDatabase db) {
+        ContentValues values = new ContentValues();
+
+        // 通话记录文件夹：存储通话笔记
+        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        // 根目录：默认文件夹
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        // 临时文件夹：用于移动笔记的中间存储
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        // 回收站：存储被删除的笔记和文件夹
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    /**
+     * 创建数据表并初始化相关触发器和索引
+     * @param db 数据库实例
+     */
+    public void createDataTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_DATA_TABLE_SQL);
+        reCreateDataTableTriggers(db);
+        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
+        Log.d(TAG, "data table has been created");
+    }
+
+    /**
+     * 重新创建数据表的所有触发器（先删除旧触发器再创建新的）
+     * @param db 数据库实例
+     */
+    private void reCreateDataTableTriggers(SQLiteDatabase db) {
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
+
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
+    }
+
+    /**
+     * 获取单例实例
+     * @param context 上下文对象
+     * @return 数据库帮助类实例
+     */
+    static synchronized NotesDatabaseHelper getInstance(Context context) {
+        if (mInstance == null) {
+            mInstance = new NotesDatabaseHelper(context);
+        }
+        return mInstance;
+    }
+
+    /**
+     * 数据库首次创建时调用，初始化表结构
+     * @param db 数据库实例
+     */
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        createNoteTable(db);
+        createDataTable(db);
+    }
+
+    /**
+     * 数据库版本升级时调用
+     * @param db 数据库实例
+     * @param oldVersion 旧版本号
+     * @param newVersion 新版本号
+     */
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        boolean reCreateTriggers = false;
+        boolean skipV2 = false;
+
+        // 版本1升级到版本2
+        if (oldVersion == 1) {
+            upgradeToV2(db);
+            skipV2 = true; // 此升级包含了从v2到v3的升级
+            oldVersion++;
+        }
+
+        // 版本2升级到版本3（跳过已包含在v1->v2中的情况）
+        if (oldVersion == 2 && !skipV2) {
+            upgradeToV3(db);
+            reCreateTriggers = true;
+            oldVersion++;
+        }
+
+        // 版本3升级到版本4
+        if (oldVersion == 3) {
+            upgradeToV4(db);
+            oldVersion++;
+        }
+
+        // 如果需要，重新创建触发器
+        if (reCreateTriggers) {
+            reCreateNoteTableTriggers(db);
+            reCreateDataTableTriggers(db);
+        }
+
+        // 验证升级是否完成
+        if (oldVersion != newVersion) {
+            throw new IllegalStateException("Upgrade notes database to version " + newVersion
+                    + "fails");
+        }
+    }
+
+    /**
+     * 升级到版本2：删除旧表并重新创建（结构调整）
+     * @param db 数据库实例
+     */
+    private void upgradeToV2(SQLiteDatabase db) {
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
+        createNoteTable(db);
+        createDataTable(db);
+    }
+
+    /**
+     * 升级到版本3：添加GTask ID字段和回收站文件夹
+     * @param db 数据库实例
+     */
+    private void upgradeToV3(SQLiteDatabase db) {
+        // 删除未使用的触发器
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
+        // 添加GTask ID字段，用于同步
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
+                + " TEXT NOT NULL DEFAULT ''");
+        // 添加回收站系统文件夹
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    /**
+     * 升级到版本4：添加版本号字段，用于数据同步控制
+     * @param db 数据库实例
+     */
+    private void upgradeToV4(SQLiteDatabase db) {
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
+                + " INTEGER NOT NULL DEFAULT 0");
+    }
+}

src/main/java/net/micode/notes/data/NotesProvider.java

@@ -0,0 +1,420 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.app.SearchManager;
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Intent;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+
+/**
+ * 便签应用的内容提供者（ContentProvider）
+ * 负责管理便签数据的CRUD操作，包括搜索功能
+ */
+public class NotesProvider extends ContentProvider {
+    /**
+     * URI匹配器，用于匹配不同的URI请求，根据URI类型执行相应的操作
+     */
+    private static final UriMatcher mMatcher;
+
+    /**
+     * 数据库帮助类实例，用于获取数据库连接
+     */
+    private NotesDatabaseHelper mHelper;
+
+    /**
+     * 日志标签，用于日志输出
+     */
+    private static final String TAG = "NotesProvider";
+
+    /**
+     * URI匹配类型常量定义，用于区分不同的URI请求类型
+     */
+    private static final int URI_NOTE            = 1;      // 操作便签表（所有记录）
+    private static final int URI_NOTE_ITEM       = 2;      // 操作便签表（单条记录）
+    private static final int URI_DATA            = 3;      // 操作数据表（所有记录）
+    private static final int URI_DATA_ITEM       = 4;      // 操作数据表（单条记录）
+    private static final int URI_SEARCH          = 5;      // 搜索操作
+    private static final int URI_SEARCH_SUGGEST  = 6;      // 搜索建议操作
+
+    /**
+     * 静态初始化块，配置URI匹配规则
+     * 为不同类型的URI请求配置对应的匹配类型
+     */
+    static {
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        // 匹配便签表的URI
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
+        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
+        // 匹配数据表的URI
+        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
+        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
+        // 匹配搜索相关的URI
+        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
+    }
+
+    /**
+     * 搜索查询的投影（列）定义
+     * x'0A' 在SQLite中代表 '\n' 字符
+     * 对于搜索结果中的标题和内容，我们将修剪 '\n' 和空白字符以显示更多信息
+     */
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+            + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
+            + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
+            + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+            + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+            + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+            + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
+
+    /**
+     * 便签片段搜索查询的SQL语句
+     * 搜索条件：便签片段包含关键词，且不在回收站中，类型为普通便签
+     */
+    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+            + " FROM " + TABLE.NOTE
+            + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
+            + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
+            + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
+
+    /**
+     * 初始化内容提供者
+     * @return 如果初始化成功返回true，否则返回false
+     */
+    @Override
+    public boolean onCreate() {
+        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        return true;
+    }
+
+    /**
+     * 查询数据
+     * @param uri 要查询的URI
+     * @param projection 要返回的列，null表示所有列
+     * @param selection 查询条件，null表示无条件
+     * @param selectionArgs 查询条件参数
+     * @param sortOrder 排序方式，null表示默认排序
+     * @return 包含查询结果的Cursor对象
+     */
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+                        String sortOrder) {
+        Cursor c = null;
+        SQLiteDatabase db = mHelper.getReadableDatabase();
+        String id = null;
+
+        // 根据URI类型执行不同的查询操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                // 查询所有便签
+                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_NOTE_ITEM:
+                // 查询单条便签记录
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_DATA:
+                // 查询所有数据记录
+                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_DATA_ITEM:
+                // 查询单条数据记录
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_SEARCH:
+            case URI_SEARCH_SUGGEST:
+                // 处理搜索和搜索建议请求
+                if (sortOrder != null || projection != null) {
+                    throw new IllegalArgumentException(
+                            "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
+                }
+
+                String searchString = null;
+                // 根据URI类型获取搜索关键词
+                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
+                    if (uri.getPathSegments().size() > 1) {
+                        searchString = uri.getPathSegments().get(1);
+                    }
+                } else {
+                    searchString = uri.getQueryParameter("pattern");
+                }
+
+                // 如果搜索关键词为空，返回null
+                if (TextUtils.isEmpty(searchString)) {
+                    return null;
+                }
+
+                try {
+                    // 构造模糊查询字符串
+                    searchString = String.format("%%%s%%", searchString);
+                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
+                            new String[] { searchString });
+                } catch (IllegalStateException ex) {
+                    Log.e(TAG, "got exception: " + ex.toString());
+                }
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        // 设置内容观察者，以便在数据变化时通知相关组件
+        if (c != null) {
+            c.setNotificationUri(getContext().getContentResolver(), uri);
+        }
+        return c;
+    }
+
+    /**
+     * 插入数据
+     * @param uri 要插入数据的URI
+     * @param values 要插入的数据值
+     * @return 新插入数据的URI
+     */
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        long dataId = 0, noteId = 0, insertedId = 0;
+
+        // 根据URI类型执行不同的插入操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                // 插入便签数据
+                insertedId = noteId = db.insert(TABLE.NOTE, null, values);
+                break;
+            case URI_DATA:
+                // 插入数据表记录
+                if (values.containsKey(DataColumns.NOTE_ID)) {
+                    noteId = values.getAsLong(DataColumns.NOTE_ID);
+                } else {
+                    Log.d(TAG, "Wrong data format without note id:" + values.toString());
+                }
+                insertedId = dataId = db.insert(TABLE.DATA, null, values);
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        // 通知便签URI的数据变化
+        if (noteId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
+        }
+
+        // 通知数据URI的数据变化
+        if (dataId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
+        }
+
+        // 返回新插入数据的URI
+        return ContentUris.withAppendedId(uri, insertedId);
+    }
+
+    /**
+     * 删除数据
+     * @param uri 要删除数据的URI
+     * @param selection 删除条件，null表示无条件
+     * @param selectionArgs 删除条件参数
+     * @return 被删除的行数
+     */
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean deleteData = false;
+
+        // 根据URI类型执行不同的删除操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                // 删除便签记录（不删除ID小于0的系统文件夹）
+                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                count = db.delete(TABLE.NOTE, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM:
+                // 删除单条便签记录
+                id = uri.getPathSegments().get(1);
+                /**
+                 * ID小于0的是系统文件夹，不允许删除（移动到回收站）
+                 */
+                long noteId = Long.valueOf(id);
+                if (noteId <= 0) {
+                    break;
+                }
+                count = db.delete(TABLE.NOTE,
+                        NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA:
+                // 删除数据记录
+                count = db.delete(TABLE.DATA, selection, selectionArgs);
+                deleteData = true;
+                break;
+            case URI_DATA_ITEM:
+                // 删除单条数据记录
+                id = uri.getPathSegments().get(1);
+                count = db.delete(TABLE.DATA,
+                        DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                deleteData = true;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        // 如果成功删除数据，发送数据变化通知
+        if (count > 0) {
+            if (deleteData) {
+                // 如果删除的是数据表记录，通知便签URI数据变化
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            // 通知当前URI数据变化
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    /**
+     * 更新数据
+     * @param uri 要更新数据的URI
+     * @param values 更新的数据值
+     * @param selection 更新条件，null表示无条件
+     * @param selectionArgs 更新条件参数
+     * @return 被更新的行数
+     */
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean updateData = false;
+
+        // 根据URI类型执行不同的更新操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                // 更新便签记录，增加版本号
+                increaseNoteVersion(-1, selection, selectionArgs);
+                count = db.update(TABLE.NOTE, values, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM:
+                // 更新单条便签记录，增加版本号
+                id = uri.getPathSegments().get(1);
+                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
+                count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA:
+                // 更新数据记录
+                count = db.update(TABLE.DATA, values, selection, selectionArgs);
+                updateData = true;
+                break;
+            case URI_DATA_ITEM:
+                // 更新单条数据记录
+                id = uri.getPathSegments().get(1);
+                count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs);
+                updateData = true;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        // 如果成功更新数据，发送数据变化通知
+        if (count > 0) {
+            if (updateData) {
+                // 如果更新的是数据表记录，通知便签URI数据变化
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            // 通知当前URI数据变化
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    /**
+     * 解析查询/更新条件
+     * 将原始条件转换为SQL语句中的AND条件
+     * @param selection 原始条件字符串
+     * @return 格式化后的条件字符串
+     */
+    private String parseSelection(String selection) {
+        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+    }
+
+    /**
+     * 增加便签版本号
+     * 当便签被修改时，调用此方法增加版本号
+     * @param id 便签ID，如果id>0则更新指定便签，否则更新所有匹配条件的便签
+     * @param selection 更新条件
+     * @param selectionArgs 更新条件参数
+     */
+    private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
+        StringBuilder sql = new StringBuilder(120);
+        sql.append("UPDATE ");
+        sql.append(TABLE.NOTE);
+        sql.append(" SET ");
+        sql.append(NoteColumns.VERSION);
+        sql.append("=" + NoteColumns.VERSION + "+1 ");
+
+        // 构造WHERE子句
+        if (id > 0 || !TextUtils.isEmpty(selection)) {
+            sql.append(" WHERE ");
+        }
+        if (id > 0) {
+            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+        }
+        if (!TextUtils.isEmpty(selection)) {
+            String selectString = id > 0 ? parseSelection(selection) : selection;
+            // 替换预编译语句中的占位符
+            for (String args : selectionArgs) {
+                selectString = selectString.replaceFirst("\\?", args);
+            }
+            sql.append(selectString);
+        }
+
+        // 执行SQL语句更新版本号
+        mHelper.getWritableDatabase().execSQL(sql.toString());
+    }
+
+    /**
+     * 返回指定URI的MIME类型
+     * @param uri 要获取MIME类型的URI
+     * @return MIME类型字符串
+     */
+    @Override
+    public String getType(Uri uri) {
+        // TODO: 实现此方法，返回合适的MIME类型
+        return null;
+    }
+}

src/main/java/net/micode/notes/gtask/data/MetaData.java

@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * MetaData类是Task的子类，用于存储与Google Tasks同步相关的元数据信息。
+ * <p>
+ * 该类主要用于在GTask同步过程中存储任务的关联信息，将元数据以JSON格式存储在
+ * Task的notes字段中，并提供了相应的解析和访问方法。
+ * </p>
+ */
+public class MetaData extends Task {
+    private final static String TAG = MetaData.class.getSimpleName();
+
+    /**
+     * 与当前元数据相关联的Google Task ID
+     */
+    private String mRelatedGid = null;
+
+    /**
+     * 设置元数据信息
+     * <p>
+     * 将Google Task ID添加到元数据JSON对象中，并将其存储在Task的notes字段中。
+     * 同时设置任务名称为元数据标识名称。
+     * </p>
+     * 
+     * @param gid 与元数据关联的Google Task ID
+     * @param metaInfo 包含元数据信息的JSON对象
+     */
+    public void setMeta(String gid, JSONObject metaInfo) {
+        try {
+            // 将关联的Google Task ID添加到元数据中
+            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
+        } catch (JSONException e) {
+            Log.e(TAG, "failed to put related gid");
+        }
+        // 将元数据JSON对象转换为字符串并存储在notes字段中
+        setNotes(metaInfo.toString());
+        // 设置任务名称为元数据标识名称
+        setName(GTaskStringUtils.META_NOTE_NAME);
+    }
+
+    /**
+     * 获取与当前元数据相关联的Google Task ID
+     * 
+     * @return 关联的Google Task ID，如果没有则返回null
+     */
+    public String getRelatedGid() {
+        return mRelatedGid;
+    }
+
+    /**
+     * 判断当前元数据是否值得保存
+     * <p>
+     * 只有当notes字段不为null时，元数据才值得保存
+     * </p>
+     * 
+     * @return 如果notes字段不为null则返回true，否则返回false
+     */
+    @Override
+    public boolean isWorthSaving() {
+        return getNotes() != null;
+    }
+
+    /**
+     * 从远程JSON数据设置内容
+     * <p>
+     * 从远程获取的JSON数据中解析元信息，并提取关联的Google Task ID
+     * </p>
+     * 
+     * @param js 包含远程数据的JSON对象
+     */
+    @Override
+    public void setContentByRemoteJSON(JSONObject js) {
+        // 调用父类方法设置基本内容
+        super.setContentByRemoteJSON(js);
+        // 如果notes字段不为null，则解析元数据
+        if (getNotes() != null) {
+            try {
+                // 解析notes字段中的JSON元数据
+                JSONObject metaInfo = new JSONObject(getNotes().trim());
+                // 提取关联的Google Task ID
+                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
+            } catch (JSONException e) {
+                Log.w(TAG, "failed to get related gid");
+                mRelatedGid = null;
+            }
+        }
+    }
+
+    /**
+     * 从本地JSON数据设置内容（不支持）
+     * <p>
+     * 该方法不应该被调用，因为MetaData主要用于处理远程同步数据
+     * </p>
+     * 
+     * @param js 本地JSON对象
+     * @throws IllegalAccessError 总是抛出此异常，表示该方法不应该被调用
+     */
+    @Override
+    public void setContentByLocalJSON(JSONObject js) {
+        // 此方法不应该被调用
+        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
+    }
+
+    /**
+     * 从内容获取本地JSON数据（不支持）
+     * <p>
+     * 该方法不应该被调用，因为MetaData主要用于处理远程同步数据
+     * </p>
+     * 
+     * @return 本地JSON对象
+     * @throws IllegalAccessError 总是抛出此异常，表示该方法不应该被调用
+     */
+    @Override
+    public JSONObject getLocalJSONFromContent() {
+        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
+    }
+
+    /**
+     * 获取同步操作（不支持）
+     * <p>
+     * 该方法不应该被调用，因为MetaData主要用于处理远程同步数据
+     * </p>
+     * 
+     * @param c 本地数据库游标
+     * @return 同步操作类型
+     * @throws IllegalAccessError 总是抛出此异常，表示该方法不应该被调用
+     */
+    @Override
+    public int getSyncAction(Cursor c) {
+        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
+    }
+
+}

src/main/java/net/micode/notes/gtask/data/Node.java

@@ -0,0 +1,223 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+
+import org.json.JSONObject;
+
+/**
+ * Node类是GTask同步系统中的抽象基类，定义了同步节点的基本属性和操作接口。
+ * <p>
+ * 该类为所有参与GTask同步的实体（如Task、TaskList等）提供了统一的接口和基础属性，
+ * 包括唯一标识符、名称、最后修改时间、删除状态等，并定义了同步操作所需的抽象方法。
+ * </p>
+ */
+public abstract class Node {
+    /**
+     * 同步操作：无操作
+     */
+    public static final int SYNC_ACTION_NONE = 0;
+
+    /**
+     * 同步操作：向远程添加节点
+     */
+    public static final int SYNC_ACTION_ADD_REMOTE = 1;
+
+    /**
+     * 同步操作：向本地添加节点
+     */
+    public static final int SYNC_ACTION_ADD_LOCAL = 2;
+
+    /**
+     * 同步操作：从远程删除节点
+     */
+    public static final int SYNC_ACTION_DEL_REMOTE = 3;
+
+    /**
+     * 同步操作：从本地删除节点
+     */
+    public static final int SYNC_ACTION_DEL_LOCAL = 4;
+
+    /**
+     * 同步操作：更新远程节点
+     */
+    public static final int SYNC_ACTION_UPDATE_REMOTE = 5;
+
+    /**
+     * 同步操作：更新本地节点
+     */
+    public static final int SYNC_ACTION_UPDATE_LOCAL = 6;
+
+    /**
+     * 同步操作：更新冲突（本地和远程都有修改）
+     */
+    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7;
+
+    /**
+     * 同步操作：同步错误
+     */
+    public static final int SYNC_ACTION_ERROR = 8;
+
+    /**
+     * 节点的唯一标识符（Google Task ID）
+     */
+    private String mGid;
+
+    /**
+     * 节点的名称
+     */
+    private String mName;
+
+    /**
+     * 节点的最后修改时间戳
+     */
+    private long mLastModified;
+
+    /**
+     * 节点的删除状态
+     */
+    private boolean mDeleted;
+
+    /**
+     * 构造函数，初始化节点的默认值
+     */
+    public Node() {
+        mGid = null;
+        mName = "";
+        mLastModified = 0;
+        mDeleted = false;
+    }
+
+    /**
+     * 获取创建节点的同步操作JSON对象
+     * 
+     * @param actionId 操作ID
+     * @return 创建操作的JSON对象
+     */
+    public abstract JSONObject getCreateAction(int actionId);
+
+    /**
+     * 获取更新节点的同步操作JSON对象
+     * 
+     * @param actionId 操作ID
+     * @return 更新操作的JSON对象
+     */
+    public abstract JSONObject getUpdateAction(int actionId);
+
+    /**
+     * 从远程JSON数据设置节点内容
+     * 
+     * @param js 包含远程数据的JSON对象
+     */
+    public abstract void setContentByRemoteJSON(JSONObject js);
+
+    /**
+     * 从本地JSON数据设置节点内容
+     * 
+     * @param js 包含本地数据的JSON对象
+     */
+    public abstract void setContentByLocalJSON(JSONObject js);
+
+    /**
+     * 从节点内容获取本地JSON数据
+     * 
+     * @return 包含本地数据的JSON对象
+     */
+    public abstract JSONObject getLocalJSONFromContent();
+
+    /**
+     * 根据本地数据库游标获取同步操作类型
+     * 
+     * @param c 本地数据库游标
+     * @return 同步操作类型（参考SYNC_ACTION_*常量）
+     */
+    public abstract int getSyncAction(Cursor c);
+
+    /**
+     * 设置节点的唯一标识符
+     * 
+     * @param gid 节点的唯一标识符（Google Task ID）
+     */
+    public void setGid(String gid) {
+        this.mGid = gid;
+    }
+
+    /**
+     * 设置节点的名称
+     * 
+     * @param name 节点的名称
+     */
+    public void setName(String name) {
+        this.mName = name;
+    }
+
+    /**
+     * 设置节点的最后修改时间戳
+     * 
+     * @param lastModified 最后修改时间戳
+     */
+    public void setLastModified(long lastModified) {
+        this.mLastModified = lastModified;
+    }
+
+    /**
+     * 设置节点的删除状态
+     * 
+     * @param deleted 是否删除
+     */
+    public void setDeleted(boolean deleted) {
+        this.mDeleted = deleted;
+    }
+
+    /**
+     * 获取节点的唯一标识符
+     * 
+     * @return 节点的唯一标识符（Google Task ID）
+     */
+    public String getGid() {
+        return this.mGid;
+    }
+
+    /**
+     * 获取节点的名称
+     * 
+     * @return 节点的名称
+     */
+    public String getName() {
+        return this.mName;
+    }
+
+    /**
+     * 获取节点的最后修改时间戳
+     * 
+     * @return 最后修改时间戳
+     */
+    public long getLastModified() {
+        return this.mLastModified;
+    }
+
+    /**
+     * 获取节点的删除状态
+     * 
+     * @return 是否删除
+     */
+    public boolean getDeleted() {
+        return this.mDeleted;
+    }
+
+}

src/main/java/net/micode/notes/gtask/data/SqlData.java

@@ -0,0 +1,337 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+import net.micode.notes.gtask.exception.ActionFailureException;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+/**
+ * SqlData类是小米笔记应用中GTask同步模块的核心数据处理类，负责本地SQL数据的CRUD操作。CRUD 是数据库操作的四种基本功能缩写：
+
+- C（Create）：创建新笔记数据
+- R（Read）：读取现有笔记数据
+- U（Update）：更新笔记数据
+- D（Delete）：删除笔记数据
+ * <p>
+ * 在Notes与Google Tasks的同步过程中，该类扮演着桥梁角色：
+ * 1. 接收并解析来自GTask的JSON格式数据
+ * 2. 将数据转换为本地数据库可存储的格式
+ * 3. 通过ContentResolver与本地ContentProvider交互，执行数据的插入、更新和删除操作
+ * 4. 支持数据差异跟踪，仅提交修改的字段以优化性能
+ * 5. 提供版本验证机制，避免同步冲突
+ * </p>
+ * <p>
+ * 该类是同步流程中的关键组件，确保本地笔记数据与Google Tasks之间的数据一致性和完整性。
+ * </p>
+ */
+public class SqlData {
+    private static final String TAG = SqlData.class.getSimpleName();
+
+    /**
+     * 无效ID常量，用于标记未初始化或无效的数据ID
+     * 在同步过程中用于区分新创建的数据和已存在的数据
+     */
+    private static final int INVALID_ID = -99999;
+
+    /**
+     * 数据库查询投影列，定义了从数据库中获取的数据字段
+     * 包含数据ID、MIME类型、内容以及扩展字段DATA1和DATA3
+     */
+    public static final String[] PROJECTION_DATA = new String[] {
+            DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
+            DataColumns.DATA3
+    };
+
+    /**
+     * 数据ID列在投影中的索引位置
+     */
+    public static final int DATA_ID_COLUMN = 0;
+
+    /**
+     * 数据MIME类型列在投影中的索引位置
+     * 用于区分不同类型的数据（如文本笔记、通话记录等）
+     */
+    public static final int DATA_MIME_TYPE_COLUMN = 1;
+
+    /**
+     * 数据内容列在投影中的索引位置
+     * 存储笔记的主要内容
+     */
+    public static final int DATA_CONTENT_COLUMN = 2;
+
+    /**
+     * 数据内容DATA1字段在投影中的索引位置
+     * 用于存储整数类型的扩展数据（如笔记模式、通话日期等）
+     */
+    public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
+
+    /**
+     * 数据内容DATA3字段在投影中的索引位置
+     * 用于存储字符串类型的扩展数据（如电话号码等）
+     */
+    public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
+
+    /**
+     * 用于访问ContentProvider的ContentResolver实例
+     * 是与本地数据库交互的核心接口
+     */
+    private ContentResolver mContentResolver;
+
+    /**
+     * 标记是否为新建数据
+     * true表示该数据需要插入数据库，false表示需要更新数据库
+     */
+    private boolean mIsCreate;
+
+    /**
+     * 数据ID
+     * 唯一标识数据库中的数据记录
+     */
+    private long mDataId;
+
+    /**
+     * 数据MIME类型
+     * 定义数据的类型，如文本笔记(DataConstants.NOTE)或通话记录
+     */
+    private String mDataMimeType;
+
+    /**
+     * 数据内容
+     * 存储笔记的主要文本内容
+     */
+    private String mDataContent;
+
+    /**
+     * 数据内容的DATA1字段
+     * 根据MIME类型不同存储不同的整数数据，如：
+     * - 对于文本笔记：存储笔记模式（普通模式或 checklist 模式）
+     * - 对于通话记录：存储通话日期
+     */
+    private long mDataContentData1;
+
+    /**
+     * 数据内容的DATA3字段
+     * 根据MIME类型不同存储不同的字符串数据，如：
+     * - 对于通话记录：存储电话号码
+     */
+    private String mDataContentData3;
+
+    /**
+     * 用于跟踪数据变化的ContentValues对象
+     * 只包含已修改的字段，用于优化数据库更新操作
+     */
+    private ContentValues mDiffDataValues;
+
+    /**
+     * 构造函数，用于创建新的SqlData实例（用于插入新数据）
+     * <p>
+     * 初始化所有字段为默认值，并将mIsCreate标记设置为true
+     * </p>
+     * 
+     * @param context 上下文对象，用于获取ContentResolver实例
+     */
+    public SqlData(Context context) {
+        mContentResolver = context.getContentResolver();
+        mIsCreate = true;
+        mDataId = INVALID_ID;
+        mDataMimeType = DataConstants.NOTE;
+        mDataContent = "";
+        mDataContentData1 = 0;
+        mDataContentData3 = "";
+        mDiffDataValues = new ContentValues();
+    }
+
+    /**
+     * 构造函数，用于从数据库Cursor加载SqlData实例（用于更新现有数据）
+     * <p>
+     * 从Cursor中读取数据并初始化所有字段，将mIsCreate标记设置为false
+     * </p>
+     * 
+     * @param context 上下文对象，用于获取ContentResolver实例
+     * @param c 数据库Cursor对象，包含要加载的数据记录
+     */
+    public SqlData(Context context, Cursor c) {
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(c);
+        mDiffDataValues = new ContentValues();
+    }
+
+    /**
+     * 从数据库Cursor中加载数据到当前SqlData实例
+     * <p>
+     * 根据PROJECTION_DATA中定义的列顺序，从Cursor中读取对应字段的值
+     * </p>
+     * 
+     * @param c 包含数据的Cursor对象，必须指向有效的数据行
+     */
+    private void loadFromCursor(Cursor c) {
+        mDataId = c.getLong(DATA_ID_COLUMN);
+        mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
+        mDataContent = c.getString(DATA_CONTENT_COLUMN);
+        mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
+        mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
+    }
+
+    /**
+     * 从JSON对象设置数据内容，并跟踪数据变化
+     * <p>
+     * 该方法是同步过程中的关键方法，用于将从GTask获取的JSON数据转换为本地数据格式
+     * 同时会跟踪数据变化，仅将修改的字段记录到mDiffDataValues中
+     * </p>
+     * 
+     * @param js 包含GTask数据的JSON对象
+     * @throws JSONException 如果JSON解析失败
+     */
+    public void setContent(JSONObject js) throws JSONException {
+        long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
+        if (mIsCreate || mDataId != dataId) {
+            mDiffDataValues.put(DataColumns.ID, dataId);
+        }
+        mDataId = dataId;
+
+        String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
+                : DataConstants.NOTE;
+        if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
+            mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
+        }
+        mDataMimeType = dataMimeType;
+
+        String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
+        if (mIsCreate || !mDataContent.equals(dataContent)) {
+            mDiffDataValues.put(DataColumns.CONTENT, dataContent);
+        }
+        mDataContent = dataContent;
+
+        long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
+        if (mIsCreate || mDataContentData1 != dataContentData1) {
+            mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
+        }
+        mDataContentData1 = dataContentData1;
+
+        String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
+        if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
+            mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
+        }
+        mDataContentData3 = dataContentData3;
+    }
+
+    /**
+     * 获取当前数据的JSON表示
+     * <p>
+     * 将本地数据转换为JSON格式，用于与GTask进行数据交换
+     * 注意：只有已提交到数据库的数据才能获取JSON表示
+     * </p>
+     * 
+     * @return 包含当前数据的JSON对象，如果数据未提交到数据库则返回null
+     * @throws JSONException 如果JSON构建失败
+     */
+    public JSONObject getContent() throws JSONException {
+        if (mIsCreate) {
+            Log.e(TAG, "it seems that we haven't created this in database yet");
+            return null;
+        }
+        JSONObject js = new JSONObject();
+        js.put(DataColumns.ID, mDataId);
+        js.put(DataColumns.MIME_TYPE, mDataMimeType);
+        js.put(DataColumns.CONTENT, mDataContent);
+        js.put(DataColumns.DATA1, mDataContentData1);
+        js.put(DataColumns.DATA3, mDataContentData3);
+        return js;
+    }
+
+    /**
+     * 将数据提交到本地数据库
+     * <p>
+     * 这是SqlData类的核心方法，根据mIsCreate标记执行插入或更新操作：
+     * 1. 如果是新数据(mIsCreate=true)，执行插入操作
+     * 2. 如果是现有数据(mIsCreate=false)，仅当有数据变化时执行更新操作
+     * 3. 支持版本验证机制，避免在同步过程中出现数据冲突
+     * </p>
+     * 
+     * @param noteId 所属的Note ID，用于关联到具体的笔记
+     * @param validateVersion 是否验证版本，true表示需要进行版本检查
+     * @param version 版本号，用于版本验证
+     * @throws ActionFailureException 如果数据提交失败
+     */
+    public void commit(long noteId, boolean validateVersion, long version) {
+
+        if (mIsCreate) {
+            if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
+                mDiffDataValues.remove(DataColumns.ID);
+            }
+
+            mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
+            Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
+            try {
+                mDataId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+        } else {
+            if (mDiffDataValues.size() > 0) {
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
+                } else {
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
+                            " ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
+                                    + " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
+                                    String.valueOf(noteId), String.valueOf(version)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }
+        }
+
+        mDiffDataValues.clear();
+        mIsCreate = false;
+    }
+
+    /**
+     * 获取数据ID
+     * <p>
+     * 返回当前数据的唯一标识符，用于在数据库中定位该记录
+     * </p>
+     * 
+     * @return 数据ID，如果数据未提交到数据库则返回INVALID_ID
+     */
+    public long getId() {
+        return mDataId;
+    }
+}

src/main/java/net/micode/notes/gtask/data/SqlNote.java

@@ -0,0 +1,714 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.tool.ResourceParser;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+/**
+ * SqlNote类是小米笔记应用中GTask同步模块的核心类，负责本地笔记数据的CRUD操作。
+ * <p>
+ * 在Notes与Google Tasks的同步过程中，该类扮演着重要角色：
+ * 1. 封装本地笔记数据模型，支持笔记和文件夹两种类型
+ * 2. 通过ContentResolver与本地ContentProvider交互，执行数据的插入、更新和删除操作
+ * 3. 支持将JSON格式的GTask数据转换为本地数据模型
+ * 4. 支持将本地数据模型转换为JSON格式以便与GTask同步
+ * 5. 实现数据差异跟踪，仅提交修改的字段以优化性能
+ * 6. 提供版本验证机制，避免同步冲突
+ * </p>
+ */
+public class SqlNote {
+    private static final String TAG = SqlNote.class.getSimpleName();
+
+    /**
+     * 无效的ID值，用于初始化和错误检查
+     */
+    private static final int INVALID_ID = -99999;
+
+/**
+     * 查询笔记时使用的投影列，包含笔记的所有核心字段
+     */
+    public static final String[] PROJECTION_NOTE = new String[] {
+            NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
+            NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
+            NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
+            NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
+            NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
+            NoteColumns.VERSION
+    };
+
+/**
+     * 投影列索引：笔记ID
+     */
+    public static final int ID_COLUMN = 0;
+
+    /**
+     * 投影列索引：提醒日期
+     */
+    public static final int ALERTED_DATE_COLUMN = 1;
+
+    /**
+     * 投影列索引：背景颜色ID
+     */
+    public static final int BG_COLOR_ID_COLUMN = 2;
+
+    /**
+     * 投影列索引：创建日期
+     */
+    public static final int CREATED_DATE_COLUMN = 3;
+
+    /**
+     * 投影列索引：是否有附件
+     */
+    public static final int HAS_ATTACHMENT_COLUMN = 4;
+
+    /**
+     * 投影列索引：修改日期
+     */
+    public static final int MODIFIED_DATE_COLUMN = 5;
+
+    /**
+     * 投影列索引：笔记数量
+     */
+    public static final int NOTES_COUNT_COLUMN = 6;
+
+    /**
+     * 投影列索引：父文件夹ID
+     */
+    public static final int PARENT_ID_COLUMN = 7;
+
+    /**
+     * 投影列索引：笔记摘要
+     */
+    public static final int SNIPPET_COLUMN = 8;
+
+    /**
+     * 投影列索引：笔记类型（笔记或文件夹）
+     */
+    public static final int TYPE_COLUMN = 9;
+
+    /**
+     * 投影列索引：小部件ID
+     */
+    public static final int WIDGET_ID_COLUMN = 10;
+
+    /**
+     * 投影列索引：小部件类型
+     */
+    public static final int WIDGET_TYPE_COLUMN = 11;
+
+    /**
+     * 投影列索引：同步ID
+     */
+    public static final int SYNC_ID_COLUMN = 12;
+
+    /**
+     * 投影列索引：本地修改标记
+     */
+    public static final int LOCAL_MODIFIED_COLUMN = 13;
+
+    /**
+     * 投影列索引：原始父文件夹ID
+     */
+    public static final int ORIGIN_PARENT_ID_COLUMN = 14;
+
+    /**
+     * 投影列索引：Google Task ID
+     */
+    public static final int GTASK_ID_COLUMN = 15;
+
+    /**
+     * 投影列索引：版本号
+     */
+    public static final int VERSION_COLUMN = 16;
+
+    /**
+     * 上下文对象，用于访问系统服务
+     */
+    private Context mContext;
+
+    /**
+     * ContentResolver对象，用于与ContentProvider交互
+     */
+    private ContentResolver mContentResolver;
+
+    /**
+     * 标记是否为新创建的笔记
+     */
+    private boolean mIsCreate;
+
+    /**
+     * 笔记ID
+     */
+    private long mId;
+
+    /**
+     * 提醒日期
+     */
+    private long mAlertDate;
+
+    /**
+     * 背景颜色ID
+     */
+    private int mBgColorId;
+
+    /**
+     * 创建日期
+     */
+    private long mCreatedDate;
+
+    /**
+     * 是否有附件（0：无，1：有）
+     */
+    private int mHasAttachment;
+
+    /**
+     * 修改日期
+     */
+    private long mModifiedDate;
+
+    /**
+     * 父文件夹ID
+     */
+    private long mParentId;
+
+    /**
+     * 笔记摘要
+     */
+    private String mSnippet;
+
+    /**
+     * 笔记类型（笔记或文件夹）
+     */
+    private int mType;
+
+    /**
+     * 小部件ID
+     */
+    private int mWidgetId;
+
+    /**
+     * 小部件类型
+     */
+    private int mWidgetType;
+
+    /**
+     * 原始父文件夹ID
+     */
+    private long mOriginParent;
+
+    /**
+     * 版本号，用于避免同步冲突
+     */
+    private long mVersion;
+
+    /**
+     * 记录笔记数据的变更，仅提交修改的字段以优化性能
+     */
+    private ContentValues mDiffNoteValues;
+
+    /**
+     * 笔记内容列表，每个SqlData对象代表笔记的一个内容部分
+     */
+    private ArrayList<SqlData> mDataList;
+
+/**
+     * 构造函数，创建一个新的SqlNote对象
+     * 
+     * @param context 上下文对象
+     */
+    public SqlNote(Context context) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = true;
+        mId = INVALID_ID;
+        mAlertDate = 0;
+        mBgColorId = ResourceParser.getDefaultBgId(context);
+        mCreatedDate = System.currentTimeMillis();
+        mHasAttachment = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mParentId = 0;
+        mSnippet = "";
+        mType = Notes.TYPE_NOTE;
+        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
+        mOriginParent = 0;
+        mVersion = 0;
+        mDiffNoteValues = new ContentValues();
+        mDataList = new ArrayList<SqlData>();
+    }
+
+/**
+     * 构造函数，从Cursor对象创建SqlNote对象
+     * 
+     * @param context 上下文对象
+     * @param c Cursor对象，包含笔记数据
+     */
+    public SqlNote(Context context, Cursor c) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(c);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+    }
+
+/**
+     * 构造函数，根据ID从数据库加载SqlNote对象
+     * 
+     * @param context 上下文对象
+     * @param id 笔记ID
+     */
+    public SqlNote(Context context, long id) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(id);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+
+    }
+
+/**
+     * 根据ID从数据库加载笔记数据
+     * 
+     * @param id 笔记ID
+     */
+    private void loadFromCursor(long id) {
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(id)
+                    }, null);
+            if (c != null) {
+                c.moveToNext();
+                loadFromCursor(c);
+            } else {
+                Log.w(TAG, "loadFromCursor: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+/**
+     * 从Cursor对象加载笔记数据
+     * 
+     * @param c Cursor对象，包含笔记数据
+     */
+    private void loadFromCursor(Cursor c) {
+        mId = c.getLong(ID_COLUMN);
+        mAlertDate = c.getLong(ALERTED_DATE_COLUMN);
+        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);
+        mCreatedDate = c.getLong(CREATED_DATE_COLUMN);
+        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);
+        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);
+        mParentId = c.getLong(PARENT_ID_COLUMN);
+        mSnippet = c.getString(SNIPPET_COLUMN);
+        mType = c.getInt(TYPE_COLUMN);
+        mWidgetId = c.getInt(WIDGET_ID_COLUMN);
+        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
+        mVersion = c.getLong(VERSION_COLUMN);
+    }
+
+/**
+     * 加载笔记的内容数据
+     */
+    private void loadDataContent() {
+        Cursor c = null;
+        mDataList.clear();
+        try {
+            c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
+                    "(note_id=?)", new String[] {
+                        String.valueOf(mId)
+                    }, null);
+            if (c != null) {
+                if (c.getCount() == 0) {
+                    Log.w(TAG, "it seems that the note has not data");
+                    return;
+                }
+                while (c.moveToNext()) {
+                    SqlData data = new SqlData(mContext, c);
+                    mDataList.add(data);
+                }
+            } else {
+                Log.w(TAG, "loadDataContent: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+/**
+     * 从JSON对象设置笔记内容
+     * 
+     * @param js JSON对象，包含GTask格式的笔记数据
+     * @return 设置成功返回true，否则返回false
+     */
+    public boolean setContent(JSONObject js) {
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                Log.w(TAG, "cannot set system folder");
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                // for folder we can only update the snnipet and type
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
+                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
+                if (mIsCreate || mId != id) {
+                    mDiffNoteValues.put(NoteColumns.ID, id);
+                }
+                mId = id;
+
+                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
+                        .getLong(NoteColumns.ALERTED_DATE) : 0;
+                if (mIsCreate || mAlertDate != alertDate) {
+                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
+                }
+                mAlertDate = alertDate;
+
+                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note
+                        .getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext);
+                if (mIsCreate || mBgColorId != bgColorId) {
+                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
+                }
+                mBgColorId = bgColorId;
+
+                long createDate = note.has(NoteColumns.CREATED_DATE) ? note
+                        .getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mCreatedDate != createDate) {
+                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
+                }
+                mCreatedDate = createDate;
+
+                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
+                        .getInt(NoteColumns.HAS_ATTACHMENT) : 0;
+                if (mIsCreate || mHasAttachment != hasAttachment) {
+                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
+                }
+                mHasAttachment = hasAttachment;
+
+                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
+                        .getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mModifiedDate != modifiedDate) {
+                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
+                }
+                mModifiedDate = modifiedDate;
+
+                long parentId = note.has(NoteColumns.PARENT_ID) ? note
+                        .getLong(NoteColumns.PARENT_ID) : 0;
+                if (mIsCreate || mParentId != parentId) {
+                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
+                }
+                mParentId = parentId;
+
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+
+                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
+                        : AppWidgetManager.INVALID_APPWIDGET_ID;
+                if (mIsCreate || mWidgetId != widgetId) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
+                }
+                mWidgetId = widgetId;
+
+                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note
+                        .getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE;
+                if (mIsCreate || mWidgetType != widgetType) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
+                }
+                mWidgetType = widgetType;
+
+                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note
+                        .getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
+                if (mIsCreate || mOriginParent != originParent) {
+                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
+                }
+                mOriginParent = originParent;
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    SqlData sqlData = null;
+                    if (data.has(DataColumns.ID)) {
+                        long dataId = data.getLong(DataColumns.ID);
+                        for (SqlData temp : mDataList) {
+                            if (dataId == temp.getId()) {
+                                sqlData = temp;
+                            }
+                        }
+                    }
+
+                    if (sqlData == null) {
+                        sqlData = new SqlData(mContext);
+                        mDataList.add(sqlData);
+                    }
+
+                    sqlData.setContent(data);
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        }
+        return true;
+    }
+
+/**
+     * 获取笔记内容的JSON表示
+     * 
+     * @return 包含笔记数据的JSON对象，如果获取失败返回null
+     */
+    public JSONObject getContent() {
+        try {
+            JSONObject js = new JSONObject();
+
+            if (mIsCreate) {
+                Log.e(TAG, "it seems that we haven't created this in database yet");
+                return null;
+            }
+
+            JSONObject note = new JSONObject();
+            if (mType == Notes.TYPE_NOTE) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.ALERTED_DATE, mAlertDate);
+                note.put(NoteColumns.BG_COLOR_ID, mBgColorId);
+                note.put(NoteColumns.CREATED_DATE, mCreatedDate);
+                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment);
+                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);
+                note.put(NoteColumns.PARENT_ID, mParentId);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.WIDGET_ID, mWidgetId);
+                note.put(NoteColumns.WIDGET_TYPE, mWidgetType);
+                note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+
+                JSONArray dataArray = new JSONArray();
+                for (SqlData sqlData : mDataList) {
+                    JSONObject data = sqlData.getContent();
+                    if (data != null) {
+                        dataArray.put(data);
+                    }
+                }
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+            } else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+            }
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+/**
+     * 设置笔记的父文件夹ID
+     * 
+     * @param id 父文件夹ID
+     */
+    public void setParentId(long id) {
+        mParentId = id;
+        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
+    }
+
+/**
+     * 设置笔记的Google Task ID
+     * 
+     * @param gid Google Task ID
+     */
+    public void setGtaskId(String gid) {
+        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
+    }
+
+/**
+     * 设置笔记的同步ID
+     * 
+     * @param syncId 同步ID
+     */
+    public void setSyncId(long syncId) {
+        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
+    }
+
+/**
+     * 重置本地修改标记
+     */
+    public void resetLocalModified() {
+        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
+    }
+
+/**
+     * 获取笔记ID
+     * 
+     * @return 笔记ID
+     */
+    public long getId() {
+        return mId;
+    }
+
+/**
+     * 获取父文件夹ID
+     * 
+     * @return 父文件夹ID
+     */
+    public long getParentId() {
+        return mParentId;
+    }
+
+/**
+     * 获取笔记摘要
+     * 
+     * @return 笔记摘要
+     */
+    public String getSnippet() {
+        return mSnippet;
+    }
+
+/**
+     * 判断是否为笔记类型（非文件夹类型）
+     * 
+     * @return 是笔记类型返回true，否则返回false
+     */
+    public boolean isNoteType() {
+        return mType == Notes.TYPE_NOTE;
+    }
+
+/**
+     * 将笔记数据提交到本地数据库
+     * 
+     * @param validateVersion 是否验证版本，true表示需要进行版本检查以避免冲突
+     * @throws ActionFailureException 如果创建笔记失败
+     * @throws IllegalStateException 如果更新笔记时ID无效
+     */
+    public void commit(boolean validateVersion) {
+        if (mIsCreate) {
+            if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
+                mDiffNoteValues.remove(NoteColumns.ID);
+            }
+
+            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
+            try {
+                mId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+            if (mId == 0) {
+                throw new IllegalStateException("Create thread id failed");
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, false, -1);
+                }
+            }
+        } else {
+            if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
+                Log.e(TAG, "No such note");
+                throw new IllegalStateException("Try to update note with invalid id");
+            }
+            if (mDiffNoteValues.size() > 0) {
+                mVersion ++;
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?)", new String[] {
+                        String.valueOf(mId)
+                    });
+                } else {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
+                            new String[] {
+                                    String.valueOf(mId), String.valueOf(mVersion)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, validateVersion, mVersion);
+                }
+            }
+        }
+
+        // refresh local info
+        loadFromCursor(mId);
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+
+        mDiffNoteValues.clear();
+        mIsCreate = false;
+    }
+}

src/main/java/net/micode/notes/gtask/data/Task.java

@@ -0,0 +1,483 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+/**
+ * Task类是Node类的子类，用于表示Google Tasks中的任务项。
+ * <p>
+ * 在小米笔记与Google Tasks的同步过程中，该类负责：
+ * 1. 封装Google Tasks任务的数据模型
+ * 2. 实现任务的创建、更新等同步操作
+ * 3. 处理本地数据与Google Tasks数据之间的转换
+ * 4. 管理任务的层次结构和关系
+ * </p>
+ */
+public class Task extends Node {
+    private static final String TAG = Task.class.getSimpleName();
+
+    /**
+     * 任务是否已完成
+     */
+    private boolean mCompleted;
+
+    /**
+     * 任务的备注信息
+     */
+    private String mNotes;
+
+    /**
+     * 任务的元信息，包含与本地笔记的关联数据
+     */
+    private JSONObject mMetaInfo;
+
+    /**
+     * 任务的前一个兄弟节点（在同一父任务列表中的前一个任务）
+     */
+    private Task mPriorSibling;
+
+    /**
+     * 任务的父任务列表
+     */
+    private TaskList mParent;
+
+/**
+     * 构造函数，创建一个新的Task对象
+     */
+    public Task() {
+        super();
+        mCompleted = false;
+        mNotes = null;
+        mPriorSibling = null;
+        mParent = null;
+        mMetaInfo = null;
+    }
+
+/**
+     * 获取创建任务的JSON动作
+     * <p>
+     * 该方法生成用于向Google Tasks服务器发送创建任务请求的JSON数据
+     * </p>
+     * 
+     * @param actionId 动作ID，用于标识当前操作
+     * @return 包含创建任务信息的JSON对象
+     * @throws ActionFailureException 如果生成JSON对象失败
+     */
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // index
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this));
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_TASK);
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+            // parent_id
+            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
+
+            // dest_parent_type
+            js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+
+            // list_id
+            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
+
+            // prior_sibling_id
+            if (mPriorSibling != null) {
+                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid());
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate task-create jsonobject");
+        }
+
+        return js;
+    }
+
+/**
+     * 获取更新任务的JSON动作
+     * <p>
+     * 该方法生成用于向Google Tasks服务器发送更新任务请求的JSON数据
+     * </p>
+     * 
+     * @param actionId 动作ID，用于标识当前操作
+     * @return 包含更新任务信息的JSON对象
+     * @throws ActionFailureException 如果生成JSON对象失败
+     */
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // id
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate task-update jsonobject");
+        }
+
+        return js;
+    }
+
+/**
+     * 从Google Tasks服务器返回的JSON数据设置任务内容
+     * 
+     * @param js 包含Google Tasks任务数据的JSON对象
+     * @throws ActionFailureException 如果解析JSON数据失败
+     */
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                // id
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+
+                // last_modified
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+
+                // name
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+
+                // notes
+                if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
+                    setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
+                }
+
+                // deleted
+                if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
+                    setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
+                }
+
+                // completed
+                if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
+                    setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
+                }
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("fail to get task content from jsonobject");
+            }
+        }
+    }
+
+/**
+     * 从本地JSON数据设置任务内容
+     * 
+     * @param js 包含本地笔记数据的JSON对象
+     */
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)
+                || !js.has(GTaskStringUtils.META_HEAD_DATA)) {
+            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
+        }
+
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) {
+                Log.e(TAG, "invalid type");
+                return;
+            }
+
+            for (int i = 0; i < dataArray.length(); i++) {
+                JSONObject data = dataArray.getJSONObject(i);
+                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                    setName(data.getString(DataColumns.CONTENT));
+                    break;
+                }
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+/**
+     * 获取任务内容的本地JSON表示
+     * <p>
+     * 该方法将任务数据转换为本地笔记系统使用的JSON格式
+     * </p>
+     * 
+     * @return 包含任务数据的本地JSON对象，如果转换失败返回null
+     */
+    public JSONObject getLocalJSONFromContent() {
+        String name = getName();
+        try {
+            if (mMetaInfo == null) {
+                // new task created from web
+                if (name == null) {
+                    Log.w(TAG, "the note seems to be an empty one");
+                    return null;
+                }
+
+                JSONObject js = new JSONObject();
+                JSONObject note = new JSONObject();
+                JSONArray dataArray = new JSONArray();
+                JSONObject data = new JSONObject();
+                data.put(DataColumns.CONTENT, name);
+                dataArray.put(data);
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+                return js;
+            } else {
+                // synced task
+                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                        data.put(DataColumns.CONTENT, getName());
+                        break;
+                    }
+                }
+
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                return mMetaInfo;
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+/**
+     * 设置任务的元信息
+     * <p>
+     * 元信息包含任务与本地笔记的关联数据
+     * </p>
+     * 
+     * @param metaData 包含元信息的MetaData对象
+     */
+    public void setMetaInfo(MetaData metaData) {
+        if (metaData != null && metaData.getNotes() != null) {
+            try {
+                mMetaInfo = new JSONObject(metaData.getNotes());
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                mMetaInfo = null;
+            }
+        }
+    }
+
+/**
+     * 获取任务的同步动作类型
+     * <p>
+     * 该方法根据本地数据和远程数据的状态，确定需要执行的同步操作类型
+     * </p>
+     * 
+     * @param c 包含本地笔记数据的Cursor对象
+     * @return 同步动作类型，取值为SYNC_ACTION_*常量之一
+     */
+    public int getSyncAction(Cursor c) {
+        try {
+            JSONObject noteInfo = null;
+            if (mMetaInfo != null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            }
+
+            if (noteInfo == null) {
+                Log.w(TAG, "it seems that note meta has been deleted");
+                return SYNC_ACTION_UPDATE_REMOTE;
+            }
+
+            if (!noteInfo.has(NoteColumns.ID)) {
+                Log.w(TAG, "remote note id seems to be deleted");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            // validate the note id now
+            if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
+                Log.w(TAG, "note id doesn't match");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // there is no local update
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // no update both side
+                    return SYNC_ACTION_NONE;
+                } else {
+                    // apply remote to local
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                // validate gtask id
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask id doesn't match");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // local modification only
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    return SYNC_ACTION_UPDATE_CONFLICT;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+/**
+     * 判断任务是否值得保存
+     * <p>
+     * 如果任务有元信息、名称或备注，则认为值得保存
+     * </p>
+     * 
+     * @return 任务值得保存返回true，否则返回false
+     */
+    public boolean isWorthSaving() {
+        return mMetaInfo != null || (getName() != null && getName().trim().length() > 0)
+                || (getNotes() != null && getNotes().trim().length() > 0);
+    }
+
+/**
+     * 设置任务的完成状态
+     * 
+     * @param completed 任务是否已完成
+     */
+    public void setCompleted(boolean completed) {
+        this.mCompleted = completed;
+    }
+
+/**
+     * 设置任务的备注信息
+     * 
+     * @param notes 任务的备注信息
+     */
+    public void setNotes(String notes) {
+        this.mNotes = notes;
+    }
+
+/**
+     * 设置任务的前一个兄弟节点
+     * 
+     * @param priorSibling 前一个兄弟任务
+     */
+    public void setPriorSibling(Task priorSibling) {
+        this.mPriorSibling = priorSibling;
+    }
+
+/**
+     * 设置任务的父任务列表
+     * 
+     * @param parent 父任务列表
+     */
+    public void setParent(TaskList parent) {
+        this.mParent = parent;
+    }
+
+/**
+     * 获取任务的完成状态
+     * 
+     * @return 任务是否已完成
+     */
+    public boolean getCompleted() {
+        return this.mCompleted;
+    }
+
+/**
+     * 获取任务的备注信息
+     * 
+     * @return 任务的备注信息
+     */
+    public String getNotes() {
+        return this.mNotes;
+    }
+
+/**
+     * 获取任务的前一个兄弟节点
+     * 
+     * @return 前一个兄弟任务
+     */
+    public Task getPriorSibling() {
+        return this.mPriorSibling;
+    }
+
+/**
+     * 获取任务的父任务列表
+     * 
+     * @return 父任务列表
+     */
+    public TaskList getParent() {
+        return this.mParent;
+    }
+
+}

src/main/java/net/micode/notes/gtask/data/TaskList.java

@@ -0,0 +1,486 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+/**
+ * TaskList类是Node类的子类，用于表示Google Tasks中的任务列表。
+ * <p>
+ * 在小米笔记与Google Tasks的同步过程中，该类负责：
+ * 1. 封装Google Tasks任务列表的数据模型
+ * 2. 管理任务列表中的子任务（Task对象）
+ * 3. 实现任务列表的创建、更新等同步操作
+ * 4. 处理本地文件夹与Google Tasks列表之间的转换
+ * </p>
+ */
+public class TaskList extends Node {
+    private static final String TAG = TaskList.class.getSimpleName();
+
+    /**
+     * 任务列表的索引位置
+     */
+    private int mIndex;
+
+    /**
+     * 任务列表中的子任务列表
+     */
+    private ArrayList<Task> mChildren;
+
+/**
+     * 构造函数，创建一个新的TaskList对象
+     */
+    public TaskList() {
+        super();
+        mChildren = new ArrayList<Task>();
+        mIndex = 1;
+    }
+
+/**
+     * 获取创建任务列表的JSON动作
+     * <p>
+     * 该方法生成用于向Google Tasks服务器发送创建任务列表请求的JSON数据
+     * </p>
+     * 
+     * @param actionId 动作ID，用于标识当前操作
+     * @return 包含创建任务列表信息的JSON对象
+     * @throws ActionFailureException 如果生成JSON对象失败
+     */
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // index
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mIndex);
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate tasklist-create jsonobject");
+        }
+
+        return js;
+    }
+
+/**
+     * 获取更新任务列表的JSON动作
+     * <p>
+     * 该方法生成用于向Google Tasks服务器发送更新任务列表请求的JSON数据
+     * </p>
+     * 
+     * @param actionId 动作ID，用于标识当前操作
+     * @return 包含更新任务列表信息的JSON对象
+     * @throws ActionFailureException 如果生成JSON对象失败
+     */
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // id
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate tasklist-update jsonobject");
+        }
+
+        return js;
+    }
+
+/**
+     * 从Google Tasks服务器返回的JSON数据设置任务列表内容
+     * 
+     * @param js 包含Google Tasks任务列表数据的JSON对象
+     * @throws ActionFailureException 如果解析JSON数据失败
+     */
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                // id
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+
+                // last_modified
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+
+                // name
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("fail to get tasklist content from jsonobject");
+            }
+        }
+    }
+
+/**
+     * 从本地JSON数据设置任务列表内容
+     * <p>
+     * 根据本地文件夹类型设置任务列表名称，支持普通文件夹、系统文件夹等
+     * </p>
+     * 
+     * @param js 包含本地文件夹数据的JSON对象
+     */
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
+        }
+
+        try {
+            JSONObject folder = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+
+            if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                String name = folder.getString(NoteColumns.SNIPPET);
+                setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + name);
+            } else if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                if (folder.getLong(NoteColumns.ID) == Notes.ID_ROOT_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT);
+                else if (folder.getLong(NoteColumns.ID) == Notes.ID_CALL_RECORD_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                            + GTaskStringUtils.FOLDER_CALL_NOTE);
+                else
+                    Log.e(TAG, "invalid system folder");
+            } else {
+                Log.e(TAG, "error type");
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+/**
+     * 获取任务列表内容的本地JSON表示
+     * <p>
+     * 该方法将任务列表数据转换为本地文件夹系统使用的JSON格式
+     * </p>
+     * 
+     * @return 包含任务列表数据的本地JSON对象，如果转换失败返回null
+     */
+    public JSONObject getLocalJSONFromContent() {
+        try {
+            JSONObject js = new JSONObject();
+            JSONObject folder = new JSONObject();
+
+            String folderName = getName();
+            if (getName().startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX))
+                folderName = folderName.substring(GTaskStringUtils.MIUI_FOLDER_PREFFIX.length(),
+                        folderName.length());
+            folder.put(NoteColumns.SNIPPET, folderName);
+            if (folderName.equals(GTaskStringUtils.FOLDER_DEFAULT)
+                    || folderName.equals(GTaskStringUtils.FOLDER_CALL_NOTE))
+                folder.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+            else
+                folder.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
+
+            js.put(GTaskStringUtils.META_HEAD_NOTE, folder);
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+/**
+     * 获取任务列表的同步动作类型
+     * <p>
+     * 该方法根据本地数据和远程数据的状态，确定需要执行的同步操作类型
+     * </p>
+     * 
+     * @param c 包含本地文件夹数据的Cursor对象
+     * @return 同步动作类型，取值为SYNC_ACTION_*常量之一
+     */
+    public int getSyncAction(Cursor c) {
+        try {
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // there is no local update
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // no update both side
+                    return SYNC_ACTION_NONE;
+                } else {
+                    // apply remote to local
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                // validate gtask id
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask id doesn't match");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // local modification only
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    // for folder conflicts, just apply local modification
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+/**
+     * 获取任务列表中的子任务数量
+     * 
+     * @return 子任务数量
+     */
+    public int getChildTaskCount() {
+        return mChildren.size();
+    }
+
+/**
+     * 向任务列表中添加子任务
+     * 
+     * @param task 要添加的子任务
+     * @return 添加成功返回true，否则返回false
+     */
+    public boolean addChildTask(Task task) {
+        boolean ret = false;
+        if (task != null && !mChildren.contains(task)) {
+            ret = mChildren.add(task);
+            if (ret) {
+                // need to set prior sibling and parent
+                task.setPriorSibling(mChildren.isEmpty() ? null : mChildren
+                        .get(mChildren.size() - 1));
+                task.setParent(this);
+            }
+        }
+        return ret;
+    }
+
+/**
+     * 在指定位置向任务列表中添加子任务
+     * 
+     * @param task 要添加的子任务
+     * @param index 要添加的位置索引
+     * @return 添加成功返回true，否则返回false
+     */
+    public boolean addChildTask(Task task, int index) {
+        if (index < 0 || index > mChildren.size()) {
+            Log.e(TAG, "add child task: invalid index");
+            return false;
+        }
+
+        int pos = mChildren.indexOf(task);
+        if (task != null && pos == -1) {
+            mChildren.add(index, task);
+
+            // update the task list
+            Task preTask = null;
+            Task afterTask = null;
+            if (index != 0)
+                preTask = mChildren.get(index - 1);
+            if (index != mChildren.size() - 1)
+                afterTask = mChildren.get(index + 1);
+
+            task.setPriorSibling(preTask);
+            if (afterTask != null)
+                afterTask.setPriorSibling(task);
+        }
+
+        return true;
+    }
+
+/**
+     * 从任务列表中移除子任务
+     * 
+     * @param task 要移除的子任务
+     * @return 移除成功返回true，否则返回false
+     */
+    public boolean removeChildTask(Task task) {
+        boolean ret = false;
+        int index = mChildren.indexOf(task);
+        if (index != -1) {
+            ret = mChildren.remove(task);
+
+            if (ret) {
+                // reset prior sibling and parent
+                task.setPriorSibling(null);
+                task.setParent(null);
+
+                // update the task list
+                if (index != mChildren.size()) {
+                    mChildren.get(index).setPriorSibling(
+                            index == 0 ? null : mChildren.get(index - 1));
+                }
+            }
+        }
+        return ret;
+    }
+
+/**
+     * 移动任务列表中的子任务到指定位置
+     * 
+     * @param task 要移动的子任务
+     * @param index 目标位置索引
+     * @return 移动成功返回true，否则返回false
+     */
+    public boolean moveChildTask(Task task, int index) {
+
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "move child task: invalid index");
+            return false;
+        }
+
+        int pos = mChildren.indexOf(task);
+        if (pos == -1) {
+            Log.e(TAG, "move child task: the task should in the list");
+            return false;
+        }
+
+        if (pos == index)
+            return true;
+        return (removeChildTask(task) && addChildTask(task, index));
+    }
+
+/**
+     * 根据Google Task ID查找子任务
+     * 
+     * @param gid Google Task ID
+     * @return 找到的子任务，如果找不到返回null
+     */
+    public Task findChildTaskByGid(String gid) {
+        for (int i = 0; i < mChildren.size(); i++) {
+            Task t = mChildren.get(i);
+            if (t.getGid().equals(gid)) {
+                return t;
+            }
+        }
+        return null;
+    }
+
+/**
+     * 获取子任务在任务列表中的索引位置
+     * 
+     * @param task 要查找的子任务
+     * @return 子任务的索引位置，如果不存在返回-1
+     */
+    public int getChildTaskIndex(Task task) {
+        return mChildren.indexOf(task);
+    }
+
+/**
+     * 根据索引位置获取子任务
+     * 
+     * @param index 要获取的子任务的索引位置
+     * @return 索引位置对应的子任务，如果索引无效返回null
+     */
+    public Task getChildTaskByIndex(int index) {
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "getTaskByIndex: invalid index");
+            return null;
+        }
+        return mChildren.get(index);
+    }
+
+/**
+     * 根据Google Task ID获取子任务
+     * <p>
+     * 注意：该方法与findChildTaskByGid功能相同，名称可能存在拼写错误（"ChilTask"应为"ChildTask"）
+     * </p>
+     * 
+     * @param gid Google Task ID
+     * @return 找到的子任务，如果找不到返回null
+     */
+    public Task getChilTaskByGid(String gid) {
+        for (Task task : mChildren) {
+            if (task.getGid().equals(gid))
+                return task;
+        }
+        return null;
+    }
+
+/**
+     * 获取任务列表中的所有子任务
+     * 
+     * @return 包含所有子任务的ArrayList
+     */
+    public ArrayList<Task> getChildTaskList() {
+        return this.mChildren;
+    }
+
+/**
+     * 设置任务列表的索引位置
+     * 
+     * @param index 新的索引位置
+     */
+    public void setIndex(int index) {
+        this.mIndex = index;
+    }
+
+/**
+     * 获取任务列表的索引位置
+     * 
+     * @return 任务列表的索引位置
+     */
+    public int getIndex() {
+        return this.mIndex;
+    }
+}

src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.exception;
+
+/**
+ * ActionFailureException是GTask同步过程中用于表示操作失败的自定义异常类
+ * <p>
+ * 当GTask同步操作（如创建、更新、删除任务或任务列表）执行失败时抛出此异常
+ * </p>
+ */
+public class ActionFailureException extends RuntimeException {
+    private static final long serialVersionUID = 4425249765923293627L;
+
+    public ActionFailureException() {
+        super();
+    }
+
+    public ActionFailureException(String paramString) {
+        super(paramString);
+    }
+
+    public ActionFailureException(String paramString, Throwable paramThrowable) {
+        super(paramString, paramThrowable);
+    }
+}

src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.exception;
+
+/**
+ * NetworkFailureException是GTask同步过程中用于表示网络操作失败的自定义检查型异常
+ * <p>
+ * 当GTask同步操作（如网络请求、数据传输）因网络问题（如网络连接中断、超时等）失败时抛出此异常
+ * </p>
+ */
+public class NetworkFailureException extends Exception {
+    private static final long serialVersionUID = 2107610287180234136L;
+
+    public NetworkFailureException() {
+        super();
+    }
+
+    public NetworkFailureException(String paramString) {
+        super(paramString);
+    }
+
+    public NetworkFailureException(String paramString, Throwable paramThrowable) {
+        super(paramString, paramThrowable);
+    }
+}

src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java

@@ -0,0 +1,209 @@
+
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.NotesListActivity;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+
+/**
+ * GTaskASyncTask是用于在后台执行GTask同步操作的异步任务类
+ * <p>
+ * 该类负责：
+ * 1. 在后台线程执行GTask同步操作
+ * 2. 显示同步进度通知
+ * 3. 处理同步结果并显示相应通知
+ * 4. 支持同步取消功能
+ * </p>
+ */
+public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
+
+    /**
+     * GTask同步通知的唯一ID
+     */
+    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+
+    /**
+     * OnCompleteListener是GTask同步完成时的回调接口
+     */
+    public interface OnCompleteListener {
+        /**
+         * 当GTask同步完成时调用此方法
+         */
+        void onComplete();
+    }
+
+    /**
+     * Android应用上下文对象
+     */
+    private Context mContext;
+
+    /**
+     * 通知管理器，用于显示同步进度和结果通知
+     */
+    private NotificationManager mNotifiManager;
+
+    /**
+     * GTask管理器实例，负责执行实际的同步操作
+     */
+    private GTaskManager mTaskManager;
+
+    /**
+     * 同步完成监听器，用于在同步结束后回调通知
+     */
+    private OnCompleteListener mOnCompleteListener;
+
+    /**
+     * GTaskASyncTask构造函数
+     * 
+     * @param context 应用上下文
+     * @param listener 同步完成监听器
+     */
+    public GTaskASyncTask(Context context, OnCompleteListener listener) {
+        mContext = context;
+        mOnCompleteListener = listener;
+        mNotifiManager = (NotificationManager) mContext
+                .getSystemService(Context.NOTIFICATION_SERVICE);
+        mTaskManager = GTaskManager.getInstance();
+    }
+
+    /**
+     * 取消当前正在进行的GTask同步操作
+     */
+    public void cancelSync() {
+        mTaskManager.cancelSync();
+    }
+
+    /**
+     * 发布同步进度更新
+     * 
+     * @param message 进度消息内容
+     */
+    public void publishProgess(String message) {
+        publishProgress(new String[] {
+            message
+        });
+    }
+
+//
+     /* 显示GTask同步通知
+     * 
+     * @param tickerId 通知标题的字符串资源ID;
+     * @param content 通知内容
+     */
+//    private void showNotification(int tickerId, String content) {
+//        Notification notification = new Notification(R.drawable.notification, mContext
+//                .getString(tickerId), System.currentTimeMillis());
+ //       notification.defaults = Notification.DEFAULT_LIGHTS;
+//        notification.flags = Notification.FLAG_AUTO_CANCEL;
+  //      PendingIntent pendingIntent;
+//        if (tickerId != R.string.ticker_success) {
+//            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+//                    NotesPreferenceActivity.class), 0);
+//
+ //        } else {
+ //           pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+//                    NotesListActivity.class), 0);
+//        }
+//        notification.setLatestEventInfo(mContext, mContext.getString(R.string.app_name), content,
+//                pendingIntent);
+//        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
+//    }
+private void showNotification(int tickerId, String content) {
+    PendingIntent pendingIntent;
+    if (tickerId != R.string.ticker_success) {
+        pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                NotesPreferenceActivity.class), PendingIntent.FLAG_IMMUTABLE);
+    } else {
+        pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                NotesListActivity.class), PendingIntent.FLAG_IMMUTABLE);
+    }
+    Notification.Builder builder = new Notification.Builder(mContext)
+            .setAutoCancel(true)
+            .setContentTitle(mContext.getString(R.string.app_name))
+            .setContentText(content)
+            .setContentIntent(pendingIntent)
+            .setWhen(System.currentTimeMillis())
+            .setOngoing(true);
+    Notification notification=builder.getNotification();
+    mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
+}
+
+    /**
+     * 在后台线程执行GTask同步操作
+     * 
+     * @param unused 未使用的参数
+     * @return 同步结果状态码
+     */
+    @Override
+    protected Integer doInBackground(Void... unused) {
+        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
+                .getSyncAccountName(mContext)));
+        return mTaskManager.sync(mContext, this);
+    }
+
+    /**
+     * 当后台任务发布进度更新时调用
+     * 
+     * @param progress 进度消息数组
+     */
+    @Override
+    protected void onProgressUpdate(String... progress) {
+        showNotification(R.string.ticker_syncing, progress[0]);
+        if (mContext instanceof GTaskSyncService) {
+            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
+        }
+    }
+
+    /**
+     * 当后台任务执行完成后调用
+     * 
+     * @param result 同步结果状态码
+     */
+    @Override
+    protected void onPostExecute(Integer result) {
+        if (result == GTaskManager.STATE_SUCCESS) {
+            showNotification(R.string.ticker_success, mContext.getString(
+                    R.string.success_sync_account, mTaskManager.getSyncAccount()));
+            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis());
+        } else if (result == GTaskManager.STATE_NETWORK_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
+        } else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
+        } else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
+            showNotification(R.string.ticker_cancel, mContext
+                    .getString(R.string.error_sync_cancelled));
+        }
+        if (mOnCompleteListener != null) {
+            new Thread(new Runnable() {
+
+                public void run() {
+                    mOnCompleteListener.onComplete();
+                }
+            }).start();
+        }
+    }
+}

src/main/java/net/micode/notes/gtask/remote/GTaskClient.java

@@ -0,0 +1,782 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AccountManagerFuture;
+import android.app.Activity;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.gtask.data.Node;
+import net.micode.notes.gtask.data.Task;
+import net.micode.notes.gtask.data.TaskList;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.gtask.exception.NetworkFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.ClientProtocolException;
+import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.cookie.Cookie;
+import org.apache.http.impl.client.BasicCookieStore;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.message.BasicNameValuePair;
+import org.apache.http.params.BasicHttpParams;
+import org.apache.http.params.HttpConnectionParams;
+import org.apache.http.params.HttpParams;
+import org.apache.http.params.HttpProtocolParams;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.Inflater;
+import java.util.zip.InflaterInputStream;
+
+
+/**
+ * GTaskClient是GTask同步模块的核心客户端类，负责与Google Tasks服务器进行交互
+ * <p>
+ * 该类提供了以下主要功能：
+ * 1. Google账号登录和认证
+ * 2. 创建、更新、删除任务
+ * 3. 创建、更新、删除任务列表
+ * 4. 移动任务（在同一任务列表内或不同任务列表之间）
+ * 5. 获取任务列表和任务数据
+ * </p>
+ * <p>
+ * 该类采用单例模式设计，确保应用中只有一个GTask客户端实例
+ * </p>
+ */
+public class GTaskClient {
+    /**
+     * 日志标签
+     */
+    private static final String TAG = GTaskClient.class.getSimpleName();
+
+    /**
+     * Google Tasks基础URL
+     */
+    private static final String GTASK_URL = "https://mail.google.com/tasks/";
+
+    /**
+     * Google Tasks GET请求URL
+     */
+    private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig";
+
+    /**
+     * Google Tasks POST请求URL
+     */
+    private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig";
+
+    /**
+     * GTaskClient单例实例
+     */
+    private static GTaskClient mInstance = null;
+
+    /**
+     * HTTP客户端实例，用于与Google Tasks服务器进行通信
+     */
+    private DefaultHttpClient mHttpClient;
+
+    /**
+     * 当前使用的GET请求URL
+     */
+    private String mGetUrl;
+
+    /**
+     * 当前使用的POST请求URL
+     */
+    private String mPostUrl;
+
+    /**
+     * Google Tasks客户端版本号
+     */
+    private long mClientVersion;
+
+    /**
+     * 登录状态标志
+     */
+    private boolean mLoggedin;
+
+    /**
+     * 上次登录时间
+     */
+    private long mLastLoginTime;
+
+    /**
+     * 操作ID，用于标识不同的同步操作
+     */
+    private int mActionId;
+
+    /**
+     * 当前同步的Google账号
+     */
+    private Account mAccount;
+
+    /**
+     * 更新操作数组，用于批量提交更新操作
+     */
+    private JSONArray mUpdateArray;
+
+    /**
+     * GTaskClient构造函数（私有，用于单例模式）
+     */
+    private GTaskClient() {
+        mHttpClient = null;
+        mGetUrl = GTASK_GET_URL;
+        mPostUrl = GTASK_POST_URL;
+        mClientVersion = -1;
+        mLoggedin = false;
+        mLastLoginTime = 0;
+        mActionId = 1;
+        mAccount = null;
+        mUpdateArray = null;
+    }
+
+    /**
+     * 获取GTaskClient单例实例
+     * 
+     * @return GTaskClient单例实例
+     */
+    public static synchronized GTaskClient getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskClient();
+        }
+        return mInstance;
+    }
+
+    /**
+     * 登录Google Tasks账号
+     * <p>
+     * 如果距离上次登录时间不超过5分钟，则不需要重新登录
+     * 如果账号发生变化，需要重新登录
+     * </p>
+     * 
+     * @param activity 调用登录的Activity
+     * @return 登录成功返回true，失败返回false
+     */
+    public boolean login(Activity activity) {
+        // we suppose that the cookie would expire after 5 minutes
+        // then we need to re-login
+        final long interval = 1000 * 60 * 5;
+        if (mLastLoginTime + interval < System.currentTimeMillis()) {
+            mLoggedin = false;
+        }
+
+        // need to re-login after account switch
+        if (mLoggedin
+                && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity
+                        .getSyncAccountName(activity))) {
+            mLoggedin = false;
+        }
+
+        if (mLoggedin) {
+            Log.d(TAG, "already logged in");
+            return true;
+        }
+
+        mLastLoginTime = System.currentTimeMillis();
+        String authToken = loginGoogleAccount(activity, false);
+        if (authToken == null) {
+            Log.e(TAG, "login google account failed");
+            return false;
+        }
+
+        // login with custom domain if necessary
+        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase()
+                .endsWith("googlemail.com"))) {
+            StringBuilder url = new StringBuilder(GTASK_URL).append("a/");
+            int index = mAccount.name.indexOf('@') + 1;
+            String suffix = mAccount.name.substring(index);
+            url.append(suffix + "/");
+            mGetUrl = url.toString() + "ig";
+            mPostUrl = url.toString() + "r/ig";
+
+            if (tryToLoginGtask(activity, authToken)) {
+                mLoggedin = true;
+            }
+        }
+
+        // try to login with google official url
+        if (!mLoggedin) {
+            mGetUrl = GTASK_GET_URL;
+            mPostUrl = GTASK_POST_URL;
+            if (!tryToLoginGtask(activity, authToken)) {
+                return false;
+            }
+        }
+
+        mLoggedin = true;
+        return true;
+    }
+
+    /**
+     * 登录Google账号，获取认证令牌
+     * 
+     * @param activity 调用登录的Activity
+     * @param invalidateToken 是否使当前令牌失效
+     * @return 认证令牌字符串，失败返回null
+     */
+    private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
+        String authToken;
+        AccountManager accountManager = AccountManager.get(activity);
+        Account[] accounts = accountManager.getAccountsByType("com.google");
+
+        if (accounts.length == 0) {
+            Log.e(TAG, "there is no available google account");
+            return null;
+        }
+
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity);
+        Account account = null;
+        for (Account a : accounts) {
+            if (a.name.equals(accountName)) {
+                account = a;
+                break;
+            }
+        }
+        if (account != null) {
+            mAccount = account;
+        } else {
+            Log.e(TAG, "unable to get an account with the same name in the settings");
+            return null;
+        }
+
+        // get the token now
+        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account,
+                "goanna_mobile", null, activity, null, null);
+        try {
+            Bundle authTokenBundle = accountManagerFuture.getResult();
+            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN);
+            if (invalidateToken) {
+                accountManager.invalidateAuthToken("com.google", authToken);
+                loginGoogleAccount(activity, false);
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "get auth token failed");
+            authToken = null;
+        }
+
+        return authToken;
+    }
+
+    /**
+     * 尝试登录Google Tasks
+     * <p>
+     * 如果登录失败，会尝试使令牌失效并重新登录
+     * </p>
+     * 
+     * @param activity 调用登录的Activity
+     * @param authToken 认证令牌
+     * @return 登录成功返回true，失败返回false
+     */
+    private boolean tryToLoginGtask(Activity activity, String authToken) {
+        if (!loginGtask(authToken)) {
+            // maybe the auth token is out of date, now let's invalidate the
+            // token and try again
+            authToken = loginGoogleAccount(activity, true);
+            if (authToken == null) {
+                Log.e(TAG, "login google account failed");
+                return false;
+            }
+
+            if (!loginGtask(authToken)) {
+                Log.e(TAG, "login gtask failed");
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * 使用认证令牌登录Google Tasks
+     * 
+     * @param authToken 认证令牌
+     * @return 登录成功返回true，失败返回false
+     */
+    private boolean loginGtask(String authToken) {
+        int timeoutConnection = 10000;
+        int timeoutSocket = 15000;
+        HttpParams httpParameters = new BasicHttpParams();
+        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
+        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
+        mHttpClient = new DefaultHttpClient(httpParameters);
+        BasicCookieStore localBasicCookieStore = new BasicCookieStore();
+        mHttpClient.setCookieStore(localBasicCookieStore);
+        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false);
+
+        // login gtask
+        try {
+            String loginUrl = mGetUrl + "?auth=" + authToken;
+            HttpGet httpGet = new HttpGet(loginUrl);
+            HttpResponse response = null;
+            response = mHttpClient.execute(httpGet);
+
+            // get the cookie now
+            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
+            boolean hasAuthCookie = false;
+            for (Cookie cookie : cookies) {
+                if (cookie.getName().contains("GTL")) {
+                    hasAuthCookie = true;
+                }
+            }
+            if (!hasAuthCookie) {
+                Log.w(TAG, "it seems that there is no auth cookie");
+            }
+
+            // get the client version
+            String resString = getResponseContent(response.getEntity());
+            String jsBegin = "_setup(";
+            String jsEnd = ")}</script>";
+            int begin = resString.indexOf(jsBegin);
+            int end = resString.lastIndexOf(jsEnd);
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end);
+            }
+            JSONObject js = new JSONObject(jsString);
+            mClientVersion = js.getLong("v");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        } catch (Exception e) {
+            // simply catch all exceptions
+            Log.e(TAG, "httpget gtask_url failed");
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * 获取下一个操作ID
+     * 
+     * @return 操作ID
+     */
+    private int getActionId() {
+        return mActionId++;
+    }
+
+    /**
+     * 创建HTTP POST请求对象
+     * 
+     * @return HttpPost请求对象
+     */
+    private HttpPost createHttpPost() {
+        HttpPost httpPost = new HttpPost(mPostUrl);
+        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
+        httpPost.setHeader("AT", "1");
+        return httpPost;
+    }
+
+    /**
+     * 获取HTTP响应内容
+     * <p>
+     * 支持gzip和deflate压缩格式
+     * </p>
+     * 
+     * @param entity HTTP响应实体
+     * @return 响应内容字符串
+     * @throws IOException 如果读取响应内容失败
+     */
+    private String getResponseContent(HttpEntity entity) throws IOException {
+        String contentEncoding = null;
+        if (entity.getContentEncoding() != null) {
+            contentEncoding = entity.getContentEncoding().getValue();
+            Log.d(TAG, "encoding: " + contentEncoding);
+        }
+
+        InputStream input = entity.getContent();
+        if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) {
+            input = new GZIPInputStream(entity.getContent());
+        } else if (contentEncoding != null && contentEncoding.equalsIgnoreCase("deflate")) {
+            Inflater inflater = new Inflater(true);
+            input = new InflaterInputStream(entity.getContent(), inflater);
+        }
+
+        try {
+            InputStreamReader isr = new InputStreamReader(input);
+            BufferedReader br = new BufferedReader(isr);
+            StringBuilder sb = new StringBuilder();
+
+            while (true) {
+                String buff = br.readLine();
+                if (buff == null) {
+                    return sb.toString();
+                }
+                sb = sb.append(buff);
+            }
+        } finally {
+            input.close();
+        }
+    }
+
+    /**
+     * 发送POST请求到Google Tasks服务器
+     * 
+     * @param js 请求内容的JSON对象
+     * @return 响应内容的JSON对象
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果请求格式或响应解析失败
+     */
+    private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in");
+        }
+
+        HttpPost httpPost = createHttpPost();
+        try {
+            LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>();
+            list.add(new BasicNameValuePair("r", js.toString()));
+            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8");
+            httpPost.setEntity(entity);
+
+            // execute the post
+            HttpResponse response = mHttpClient.execute(httpPost);
+            String jsString = getResponseContent(response.getEntity());
+            return new JSONObject(jsString);
+
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed");
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("unable to convert response content to jsonobject");
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("error occurs when posting request");
+        }
+    }
+
+    /**
+     * 创建新任务
+     * 
+     * @param task 要创建的任务对象
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果任务创建失败
+     */
+    public void createTask(Task task) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            actionList.put(task.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // post
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+            task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create task: handing jsonobject failed");
+        }
+    }
+
+    /**
+     * 创建新任务列表
+     * 
+     * @param tasklist 要创建的任务列表对象
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果任务列表创建失败
+     */
+    public void createTaskList(TaskList tasklist) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            actionList.put(tasklist.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // post
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+            tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create tasklist: handing jsonobject failed");
+        }
+    }
+
+    /**
+     * 提交批量更新操作
+     * 
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果更新提交失败
+     */
+    public void commitUpdate() throws NetworkFailureException {
+        if (mUpdateArray != null) {
+            try {
+                JSONObject jsPost = new JSONObject();
+
+                // action_list
+                jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, mUpdateArray);
+
+                // client_version
+                jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+                postRequest(jsPost);
+                mUpdateArray = null;
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("commit update: handing jsonobject failed");
+            }
+        }
+    }
+
+    /**
+     * 添加节点更新操作到批量更新数组
+     * <p>
+     * 如果更新数组中的操作数量超过10个，则立即提交更新
+     * </p>
+     * 
+     * @param node 要更新的节点对象
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果更新操作添加失败
+     */
+    public void addUpdateNode(Node node) throws NetworkFailureException {
+        if (node != null) {
+            // too many update items may result in an error
+            // set max to 10 items
+            if (mUpdateArray != null && mUpdateArray.length() > 10) {
+                commitUpdate();
+            }
+
+            if (mUpdateArray == null)
+                mUpdateArray = new JSONArray();
+            mUpdateArray.put(node.getUpdateAction(getActionId()));
+        }
+    }
+
+    /**
+     * 移动任务
+     * <p>
+     * 支持在同一任务列表内移动或在不同任务列表之间移动
+     * </p>
+     * 
+     * @param task 要移动的任务
+     * @param preParent 任务原来的父任务列表
+     * @param curParent 任务现在的父任务列表
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果任务移动失败
+     */
+    public void moveTask(Task task, TaskList preParent, TaskList curParent)
+            throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // action_list
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid());
+            if (preParent == curParent && task.getPriorSibling() != null) {
+                // put prioring_sibing_id only if moving within the tasklist and
+                // it is not the first one
+                action.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, task.getPriorSibling());
+            }
+            action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid());
+            action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid());
+            if (preParent != curParent) {
+                // put the dest_list only if moving between tasklists
+                action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
+            }
+            actionList.put(action);
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("move task: handing jsonobject failed");
+        }
+    }
+
+    /**
+     * 删除节点（任务或任务列表）
+     * 
+     * @param node 要删除的节点对象
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果节点删除失败
+     */
+    public void deleteNode(Node node) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            node.setDeleted(true);
+            actionList.put(node.getUpdateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost);
+            mUpdateArray = null;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("delete node: handing jsonobject failed");
+        }
+    }
+
+    /**
+     * 获取所有任务列表
+     * 
+     * @return 包含所有任务列表的JSON数组
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果获取任务列表失败
+     */
+    public JSONArray getTaskLists() throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in");
+        }
+
+        try {
+            HttpGet httpGet = new HttpGet(mGetUrl);
+            HttpResponse response = null;
+            response = mHttpClient.execute(httpGet);
+
+            // get the task list
+            String resString = getResponseContent(response.getEntity());
+            String jsBegin = "_setup(";
+            String jsEnd = ")}</script>";
+            int begin = resString.indexOf(jsBegin);
+            int end = resString.lastIndexOf(jsEnd);
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end);
+            }
+            JSONObject js = new JSONObject(jsString);
+            return js.getJSONObject("t").getJSONArray(GTaskStringUtils.GTASK_JSON_LISTS);
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed");
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task lists: handing jasonobject failed");
+        }
+    }
+
+    /**
+     * 获取指定任务列表中的所有任务
+     * 
+     * @param listGid 任务列表的Google ID
+     * @return 包含任务列表中所有任务的JSON数组
+     * @throws NetworkFailureException 如果网络请求失败
+     * @throws ActionFailureException 如果获取任务失败
+     */
+    public JSONArray getTaskList(String listGid) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // action_list
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid);
+            action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false);
+            actionList.put(action);
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            JSONObject jsResponse = postRequest(jsPost);
+            return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS);
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task list: handing jsonobject failed");
+        }
+    }
+
+    /**
+     * 获取当前同步的Google账号
+     * 
+     * @return 当前同步的Google账号
+     */
+    public Account getSyncAccount() {
+        return mAccount;
+    }
+
+    /**
+     * 重置更新数组
+     */
+    public void resetUpdateArray() {
+        mUpdateArray = null;
+    }
+}

src/main/java/net/micode/notes/gtask/remote/GTaskManager.java

@@ -0,0 +1,944 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Activity;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.data.MetaData;
+import net.micode.notes.gtask.data.Node;
+import net.micode.notes.gtask.data.SqlNote;
+import net.micode.notes.gtask.data.Task;
+import net.micode.notes.gtask.data.TaskList;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.gtask.exception.NetworkFailureException;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+
+
+/**
+ * GTaskManager是GTask同步模块的核心管理类，负责协调本地笔记与Google Tasks服务器之间的同步
+ * <p>
+ * 该类采用单例模式，提供以下主要功能：
+ * 1. 管理同步状态和进度
+ * 2. 初始化远程任务列表
+ * 3. 同步本地和远程内容（文件夹和笔记）
+ * 4. 处理同步冲突和错误
+ * </p>
+ */
+public class GTaskManager {
+    private static final String TAG = GTaskManager.class.getSimpleName();
+
+    /**
+     * 同步成功状态
+     */
+    public static final int STATE_SUCCESS = 0;
+
+    /**
+     * 网络错误状态
+     */
+    public static final int STATE_NETWORK_ERROR = 1;
+
+    /**
+     * 内部错误状态
+     */
+    public static final int STATE_INTERNAL_ERROR = 2;
+
+    /**
+     * 同步进行中状态
+     */
+    public static final int STATE_SYNC_IN_PROGRESS = 3;
+
+    /**
+     * 同步已取消状态
+     */
+    public static final int STATE_SYNC_CANCELLED = 4;
+
+    /**
+     * GTaskManager的单例实例
+     */
+    private static GTaskManager mInstance = null;
+
+    /**
+     * 用于Google登录的Activity实例
+     */
+    private Activity mActivity;
+
+    /**
+     * 应用上下文
+     */
+    private Context mContext;
+
+    /**
+     * 内容解析器，用于访问本地数据库
+     */
+    private ContentResolver mContentResolver;
+
+    /**
+     * 同步状态标志，表示是否正在进行同步
+     */
+    private boolean mSyncing;
+
+    /**
+     * 取消标志，表示同步是否已被取消
+     */
+    private boolean mCancelled;
+
+    /**
+     * 远程任务列表的HashMap，键为任务列表的GID
+     */
+    private HashMap<String, TaskList> mGTaskListHashMap;
+
+    /**
+     * 所有远程任务的HashMap，键为任务的GID
+     */
+    private HashMap<String, Node> mGTaskHashMap;
+
+    /**
+     * 元数据的HashMap，键为相关节点的GID
+     */
+    private HashMap<String, MetaData> mMetaHashMap;
+
+    /**
+     * 存储元数据的任务列表
+     */
+    private TaskList mMetaList;
+
+    /**
+     * 本地已删除笔记的ID集合
+     */
+    private HashSet<Long> mLocalDeleteIdMap;
+
+    /**
+     * 远程GID到本地NID的映射
+     */
+    private HashMap<String, Long> mGidToNid;
+
+    /**
+     * 本地NID到远程GID的映射
+     */
+    private HashMap<Long, String> mNidToGid;
+
+    /**
+     * 私有构造方法，初始化GTaskManager的内部状态和集合
+     */
+    private GTaskManager() {
+        mSyncing = false;
+        mCancelled = false;
+        mGTaskListHashMap = new HashMap<String, TaskList>();
+        mGTaskHashMap = new HashMap<String, Node>();
+        mMetaHashMap = new HashMap<String, MetaData>();
+        mMetaList = null;
+        mLocalDeleteIdMap = new HashSet<Long>();
+        mGidToNid = new HashMap<String, Long>();
+        mNidToGid = new HashMap<Long, String>();
+    }
+
+    /**
+     * 获取GTaskManager的单例实例
+     * @return GTaskManager的单例实例
+     */
+    public static synchronized GTaskManager getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskManager();
+        }
+        return mInstance;
+    }
+
+    /**
+     * 设置用于Google登录的Activity上下文
+     * @param activity 用于获取认证令牌的Activity实例
+     */
+    public synchronized void setActivityContext(Activity activity) {
+        mActivity = activity;
+    }
+
+    /**
+     * 执行GTask同步操作，协调本地笔记与Google Tasks服务器之间的数据同步
+     * @param context 应用上下文
+     * @param asyncTask 用于发布同步进度的异步任务实例
+     * @return 同步结果状态：
+     *         - {@link #STATE_SUCCESS}：同步成功
+     *         - {@link #STATE_NETWORK_ERROR}：网络错误
+     *         - {@link #STATE_INTERNAL_ERROR}：内部错误
+     *         - {@link #STATE_SYNC_IN_PROGRESS}：同步已在进行中
+     *         - {@link #STATE_SYNC_CANCELLED}：同步被取消
+     */
+    public int sync(Context context, GTaskASyncTask asyncTask) {
+        if (mSyncing) {
+            Log.d(TAG, "Sync is in progress");
+            return STATE_SYNC_IN_PROGRESS;
+        }
+        mContext = context;
+        mContentResolver = mContext.getContentResolver();
+        mSyncing = true;
+        mCancelled = false;
+        mGTaskListHashMap.clear();
+        mGTaskHashMap.clear();
+        mMetaHashMap.clear();
+        mLocalDeleteIdMap.clear();
+        mGidToNid.clear();
+        mNidToGid.clear();
+
+        try {
+            GTaskClient client = GTaskClient.getInstance();
+            client.resetUpdateArray();
+
+            // login google task
+            if (!mCancelled) {
+                if (!client.login(mActivity)) {
+                    throw new NetworkFailureException("login google task failed");
+                }
+            }
+
+            // get the task list from google
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
+            initGTaskList();
+
+            // do content sync work
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
+            syncContent();
+        } catch (NetworkFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_NETWORK_ERROR;
+        } catch (ActionFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_INTERNAL_ERROR;
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return STATE_INTERNAL_ERROR;
+        } finally {
+            mGTaskListHashMap.clear();
+            mGTaskHashMap.clear();
+            mMetaHashMap.clear();
+            mLocalDeleteIdMap.clear();
+            mGidToNid.clear();
+            mNidToGid.clear();
+            mSyncing = false;
+        }
+
+        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;
+    }
+
+    /**
+     * 初始化远程任务列表，从Google Tasks服务器获取所有任务列表和任务
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void initGTaskList() throws NetworkFailureException {
+        if (mCancelled)
+            return;
+        GTaskClient client = GTaskClient.getInstance();
+        try {
+            JSONArray jsTaskLists = client.getTaskLists();
+
+            // init meta list first
+            mMetaList = null;
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name
+                        .equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                    mMetaList = new TaskList();
+                    mMetaList.setContentByRemoteJSON(object);
+
+                    // load meta data
+                    JSONArray jsMetas = client.getTaskList(gid);
+                    for (int j = 0; j < jsMetas.length(); j++) {
+                        object = (JSONObject) jsMetas.getJSONObject(j);
+                        MetaData metaData = new MetaData();
+                        metaData.setContentByRemoteJSON(object);
+                        if (metaData.isWorthSaving()) {
+                            mMetaList.addChildTask(metaData);
+                            if (metaData.getGid() != null) {
+                                mMetaHashMap.put(metaData.getRelatedGid(), metaData);
+                            }
+                        }
+                    }
+                }
+            }
+
+            // create meta list if not existed
+            if (mMetaList == null) {
+                mMetaList = new TaskList();
+                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                        + GTaskStringUtils.FOLDER_META);
+                GTaskClient.getInstance().createTaskList(mMetaList);
+            }
+
+            // init task list
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name.startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX)
+                        && !name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                                + GTaskStringUtils.FOLDER_META)) {
+                    TaskList tasklist = new TaskList();
+                    tasklist.setContentByRemoteJSON(object);
+                    mGTaskListHashMap.put(gid, tasklist);
+                    mGTaskHashMap.put(gid, tasklist);
+
+                    // load tasks
+                    JSONArray jsTasks = client.getTaskList(gid);
+                    for (int j = 0; j < jsTasks.length(); j++) {
+                        object = (JSONObject) jsTasks.getJSONObject(j);
+                        gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                        Task task = new Task();
+                        task.setContentByRemoteJSON(object);
+                        if (task.isWorthSaving()) {
+                            task.setMetaInfo(mMetaHashMap.get(gid));
+                            tasklist.addChildTask(task);
+                            mGTaskHashMap.put(gid, task);
+                        }
+                    }
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("initGTaskList: handing JSONObject failed");
+        }
+    }
+
+    /**
+     * 同步本地和远程内容，处理本地删除、文件夹和笔记的同步
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void syncContent() throws NetworkFailureException {
+        int syncType;
+        Cursor c = null;
+        String gid;
+        Node node;
+
+        mLocalDeleteIdMap.clear();
+
+        if (mCancelled) {
+            return;
+        }
+
+        // for local deleted note
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id=?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, null);
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        doContentSync(Node.SYNC_ACTION_DEL_REMOTE, node, c);
+                    }
+
+                    mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                }
+            } else {
+                Log.w(TAG, "failed to query trash folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // sync folder first
+        syncFolder();
+
+        // for note existing in database
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_NOTE), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // local add
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // remote delete
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing note in database");
+            }
+
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // go through remaining items
+        Iterator<Map.Entry<String, Node>> iter = mGTaskHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, Node> entry = iter.next();
+            node = entry.getValue();
+            doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+        }
+
+        // mCancelled can be set by another thread, so we neet to check one by
+        // one
+        // clear local delete table
+        if (!mCancelled) {
+            if (!DataUtils.batchDeleteNotes(mContentResolver, mLocalDeleteIdMap)) {
+                throw new ActionFailureException("failed to batch-delete local deleted notes");
+            }
+        }
+
+        // refresh local sync id
+        if (!mCancelled) {
+            GTaskClient.getInstance().commitUpdate();
+            refreshLocalSyncId();
+        }
+
+    }
+
+    /**
+     * 同步文件夹，包括根文件夹、通话记录文件夹和普通文件夹
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void syncFolder() throws NetworkFailureException {
+        Cursor c = null;
+        String gid;
+        Node node;
+        int syncType;
+
+        if (mCancelled) {
+            return;
+        }
+
+        // for root folder
+        try {
+            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                    Notes.ID_ROOT_FOLDER), SqlNote.PROJECTION_NOTE, null, null, null);
+            if (c != null) {
+                c.moveToNext();
+                gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                node = mGTaskHashMap.get(gid);
+                if (node != null) {
+                    mGTaskHashMap.remove(gid);
+                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER);
+                    mNidToGid.put((long) Notes.ID_ROOT_FOLDER, gid);
+                    // for system folder, only update remote name if necessary
+                    if (!node.getName().equals(
+                            GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT))
+                        doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                } else {
+                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query root folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for call-note folder
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(Notes.ID_CALL_RECORD_FOLDER)
+                    }, null);
+            if (c != null) {
+                if (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);
+                        mNidToGid.put((long) Notes.ID_CALL_RECORD_FOLDER, gid);
+                        // for system folder, only update remote name if
+                        // necessary
+                        if (!node.getName().equals(
+                                GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                                        + GTaskStringUtils.FOLDER_CALL_NOTE))
+                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                    } else {
+                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                    }
+                }
+            } else {
+                Log.w(TAG, "failed to query call note folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for local existing folders
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // local add
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // remote delete
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for remote add folders
+        Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, TaskList> entry = iter.next();
+            gid = entry.getKey();
+            node = entry.getValue();
+            if (mGTaskHashMap.containsKey(gid)) {
+                mGTaskHashMap.remove(gid);
+                doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+            }
+        }
+
+        if (!mCancelled)
+            GTaskClient.getInstance().commitUpdate();
+    }
+
+    /**
+     * 根据同步类型执行不同的同步操作
+     * @param syncType 同步类型，来自{@link Node}类的同步操作常量
+     * @param node 要同步的节点（可以是TaskList或Task）
+     * @param c 本地数据库游标，用于获取本地数据
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void doContentSync(int syncType, Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        MetaData meta;
+        switch (syncType) {
+            case Node.SYNC_ACTION_ADD_LOCAL:
+                addLocalNode(node);
+                break;
+            case Node.SYNC_ACTION_ADD_REMOTE:
+                addRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_DEL_LOCAL:
+                meta = mMetaHashMap.get(c.getString(SqlNote.GTASK_ID_COLUMN));
+                if (meta != null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                break;
+            case Node.SYNC_ACTION_DEL_REMOTE:
+                meta = mMetaHashMap.get(node.getGid());
+                if (meta != null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                GTaskClient.getInstance().deleteNode(node);
+                break;
+            case Node.SYNC_ACTION_UPDATE_LOCAL:
+                updateLocalNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_REMOTE:
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_CONFLICT:
+                // merging both modifications maybe a good idea
+                // right now just use local update simply
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_NONE:
+                break;
+            case Node.SYNC_ACTION_ERROR:
+            default:
+                throw new ActionFailureException("unkown sync action type");
+        }
+    }
+
+    /**
+     * 将远程节点添加到本地数据库
+     * @param node 要添加的远程节点
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void addLocalNode(Node node) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        if (node instanceof TaskList) {
+            if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_ROOT_FOLDER);
+            } else if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_CALL_RECORD_FOLDER);
+            } else {
+                sqlNote = new SqlNote(mContext);
+                sqlNote.setContent(node.getLocalJSONFromContent());
+                sqlNote.setParentId(Notes.ID_ROOT_FOLDER);
+            }
+        } else {
+            sqlNote = new SqlNote(mContext);
+            JSONObject js = node.getLocalJSONFromContent();
+            try {
+                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                    JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                    if (note.has(NoteColumns.ID)) {
+                        long id = note.getLong(NoteColumns.ID);
+                        if (DataUtils.existInNoteDatabase(mContentResolver, id)) {
+                            // the id is not available, have to create a new one
+                            note.remove(NoteColumns.ID);
+                        }
+                    }
+                }
+
+                if (js.has(GTaskStringUtils.META_HEAD_DATA)) {
+                    JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                    for (int i = 0; i < dataArray.length(); i++) {
+                        JSONObject data = dataArray.getJSONObject(i);
+                        if (data.has(DataColumns.ID)) {
+                            long dataId = data.getLong(DataColumns.ID);
+                            if (DataUtils.existInDataDatabase(mContentResolver, dataId)) {
+                                // the data id is not available, have to create
+                                // a new one
+                                data.remove(DataColumns.ID);
+                            }
+                        }
+                    }
+
+                }
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                e.printStackTrace();
+            }
+            sqlNote.setContent(js);
+
+            Long parentId = mGidToNid.get(((Task) node).getParent().getGid());
+            if (parentId == null) {
+                Log.e(TAG, "cannot find task's parent id locally");
+                throw new ActionFailureException("cannot add local node");
+            }
+            sqlNote.setParentId(parentId.longValue());
+        }
+
+        // create the local node
+        sqlNote.setGtaskId(node.getGid());
+        sqlNote.commit(false);
+
+        // update gid-nid mapping
+        mGidToNid.put(node.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), node.getGid());
+
+        // update meta
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    /**
+     * 更新本地节点，将远程节点的内容更新到本地数据库
+     * @param node 要同步的远程节点
+     * @param c 本地数据库游标，用于获取本地数据
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        // update the note locally
+        sqlNote = new SqlNote(mContext, c);
+        sqlNote.setContent(node.getLocalJSONFromContent());
+
+        Long parentId = (node instanceof Task) ? mGidToNid.get(((Task) node).getParent().getGid())
+                : new Long(Notes.ID_ROOT_FOLDER);
+        if (parentId == null) {
+            Log.e(TAG, "cannot find task's parent id locally");
+            throw new ActionFailureException("cannot update local node");
+        }
+        sqlNote.setParentId(parentId.longValue());
+        sqlNote.commit(true);
+
+        // update meta info
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    /**
+     * 将本地节点添加到远程服务器
+     * @param node 要同步的远程节点（可以为null，表示创建新节点）
+     * @param c 本地数据库游标，用于获取本地数据
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+        Node n;
+
+        // update remotely
+        if (sqlNote.isNoteType()) {
+            Task task = new Task();
+            task.setContentByLocalJSON(sqlNote.getContent());
+
+            String parentGid = mNidToGid.get(sqlNote.getParentId());
+            if (parentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot add remote task");
+            }
+            mGTaskListHashMap.get(parentGid).addChildTask(task);
+
+            GTaskClient.getInstance().createTask(task);
+            n = (Node) task;
+
+            // add meta
+            updateRemoteMeta(task.getGid(), sqlNote);
+        } else {
+            TaskList tasklist = null;
+
+            // we need to skip folder if it has already existed
+            String folderName = GTaskStringUtils.MIUI_FOLDER_PREFFIX;
+            if (sqlNote.getId() == Notes.ID_ROOT_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_DEFAULT;
+            else if (sqlNote.getId() == Notes.ID_CALL_RECORD_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_CALL_NOTE;
+            else
+                folderName += sqlNote.getSnippet();
+
+            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+            while (iter.hasNext()) {
+                Map.Entry<String, TaskList> entry = iter.next();
+                String gid = entry.getKey();
+                TaskList list = entry.getValue();
+
+                if (list.getName().equals(folderName)) {
+                    tasklist = list;
+                    if (mGTaskHashMap.containsKey(gid)) {
+                        mGTaskHashMap.remove(gid);
+                    }
+                    break;
+                }
+            }
+
+            // no match we can add now
+            if (tasklist == null) {
+                tasklist = new TaskList();
+                tasklist.setContentByLocalJSON(sqlNote.getContent());
+                GTaskClient.getInstance().createTaskList(tasklist);
+                mGTaskListHashMap.put(tasklist.getGid(), tasklist);
+            }
+            n = (Node) tasklist;
+        }
+
+        // update local note
+        sqlNote.setGtaskId(n.getGid());
+        sqlNote.commit(false);
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+
+        // gid-id mapping
+        mGidToNid.put(n.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), n.getGid());
+    }
+
+    /**
+     * 更新远程节点，将本地节点的内容更新到远程服务器
+     * @param node 要更新的远程节点
+     * @param c 本地数据库游标，用于获取本地数据
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+
+        // update remotely
+        node.setContentByLocalJSON(sqlNote.getContent());
+        GTaskClient.getInstance().addUpdateNode(node);
+
+        // update meta
+        updateRemoteMeta(node.getGid(), sqlNote);
+
+        // move task if necessary
+        if (sqlNote.isNoteType()) {
+            Task task = (Task) node;
+            TaskList preParentList = task.getParent();
+
+            String curParentGid = mNidToGid.get(sqlNote.getParentId());
+            if (curParentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot update remote task");
+            }
+            TaskList curParentList = mGTaskListHashMap.get(curParentGid);
+
+            if (preParentList != curParentList) {
+                preParentList.removeChildTask(task);
+                curParentList.addChildTask(task);
+                GTaskClient.getInstance().moveTask(task, preParentList, curParentList);
+            }
+        }
+
+        // clear local modified flag
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+    }
+
+    /**
+     * 更新远程元数据，将本地笔记的元数据信息同步到远程服务器
+     * @param gid 远程节点的GID
+     * @param sqlNote 本地笔记对象
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void updateRemoteMeta(String gid, SqlNote sqlNote) throws NetworkFailureException {
+        if (sqlNote != null && sqlNote.isNoteType()) {
+            MetaData metaData = mMetaHashMap.get(gid);
+            if (metaData != null) {
+                metaData.setMeta(gid, sqlNote.getContent());
+                GTaskClient.getInstance().addUpdateNode(metaData);
+            } else {
+                metaData = new MetaData();
+                metaData.setMeta(gid, sqlNote.getContent());
+                mMetaList.addChildTask(metaData);
+                mMetaHashMap.put(gid, metaData);
+                GTaskClient.getInstance().createTask(metaData);
+            }
+        }
+    }
+
+    /**
+     * 刷新本地同步ID，根据远程数据更新本地节点的同步时间戳
+     * @throws NetworkFailureException 网络操作失败时抛出
+     */
+    private void refreshLocalSyncId() throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        // get the latest gtask list
+        mGTaskHashMap.clear();
+        mGTaskListHashMap.clear();
+        mMetaHashMap.clear();
+        initGTaskList();
+
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    String gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    Node node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        ContentValues values = new ContentValues();
+                        values.put(NoteColumns.SYNC_ID, node.getLastModified());
+                        mContentResolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                                c.getLong(SqlNote.ID_COLUMN)), values, null, null);
+                    } else {
+                        Log.e(TAG, "something is missed");
+                        throw new ActionFailureException(
+                                "some local items don't have gid after sync");
+                    }
+                }
+            } else {
+                Log.w(TAG, "failed to query local note to refresh sync id");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+    }
+
+    /**
+     * 获取当前同步账户的名称
+     * @return 同步账户名称
+     */
+    public String getSyncAccount() {
+        return GTaskClient.getInstance().getSyncAccount().name;
+    }
+
+    /**
+     * 取消当前正在进行的同步操作
+     */
+    public void cancelSync() {
+        mCancelled = true;
+    }
+}

src/main/java/net/micode/notes/gtask/remote/GTaskSyncService.java

@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Activity;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.IBinder;
+
+/**
+ * GTaskSyncService是GTask同步的服务类，负责管理GTask同步的启动、取消和进度通知
+ * <p>
+ * 该服务提供了以下主要功能：
+ * 1. 启动GTask同步操作
+ * 2. 取消正在进行的同步操作
+ * 3. 通过广播通知同步状态和进度
+ * </p>
+ */
+public class GTaskSyncService extends Service {
+    /**
+     * 同步操作类型的Intent参数名称
+     */
+    public final static String ACTION_STRING_NAME = "sync_action_type";
+
+    /**
+     * 启动同步操作的常量
+     */
+    public final static int ACTION_START_SYNC = 0;
+
+    /**
+     * 取消同步操作的常量
+     */
+    public final static int ACTION_CANCEL_SYNC = 1;
+
+    /**
+     * 无效操作的常量
+     */
+    public final static int ACTION_INVALID = 2;
+
+    /**
+     * GTask同步服务广播的Intent名称
+     */
+    public final static String GTASK_SERVICE_BROADCAST_NAME = "net.micode.notes.gtask.remote.gtask_sync_service";
+
+    /**
+     * 广播中表示同步状态的参数名称
+     */
+    public final static String GTASK_SERVICE_BROADCAST_IS_SYNCING = "isSyncing";
+
+    /**
+     * 广播中表示同步进度的参数名称
+     */
+    public final static String GTASK_SERVICE_BROADCAST_PROGRESS_MSG = "progressMsg";
+
+    /**
+     * 当前正在执行的同步任务实例
+     */
+    private static GTaskASyncTask mSyncTask = null;
+
+    /**
+     * 当前同步进度信息
+     */
+    private static String mSyncProgress = "";
+
+    /**
+     * 启动同步操作
+     */
+    private void startSync() {
+        if (mSyncTask == null) {
+            mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
+                public void onComplete() {
+                    mSyncTask = null;
+                    sendBroadcast("");
+                    stopSelf();
+                }
+            });
+            sendBroadcast("");
+            mSyncTask.execute();
+        }
+    }
+
+    /**
+     * 取消正在进行的同步操作
+     */
+    private void cancelSync() {
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    @Override
+    public void onCreate() {
+        mSyncTask = null;
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        Bundle bundle = intent.getExtras();
+        if (bundle != null && bundle.containsKey(ACTION_STRING_NAME)) {
+            switch (bundle.getInt(ACTION_STRING_NAME, ACTION_INVALID)) {
+                case ACTION_START_SYNC:
+                    startSync();
+                    break;
+                case ACTION_CANCEL_SYNC:
+                    cancelSync();
+                    break;
+                default:
+                    break;
+            }
+            return START_STICKY;
+        }
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Override
+    public void onLowMemory() {
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    /**
+     * 发送同步状态广播
+     * @param msg 同步进度消息
+     */
+    public void sendBroadcast(String msg) {
+        mSyncProgress = msg;
+        Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, mSyncTask != null);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_PROGRESS_MSG, msg);
+        sendBroadcast(intent);
+    }
+
+    /**
+     * 启动GTask同步服务
+     * @param activity 调用该方法的Activity实例
+     */
+    public static void startSync(Activity activity) {
+        GTaskManager.getInstance().setActivityContext(activity);
+        Intent intent = new Intent(activity, GTaskSyncService.class);
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_START_SYNC);
+        activity.startService(intent);
+    }
+
+    /**
+     * 取消GTask同步服务
+     * @param context 调用该方法的上下文
+     */
+    public static void cancelSync(Context context) {
+        Intent intent = new Intent(context, GTaskSyncService.class);
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_CANCEL_SYNC);
+        context.startService(intent);
+    }
+
+    /**
+     * 检查是否正在进行同步
+     * @return 如果正在同步返回true，否则返回false
+     */
+    public static boolean isSyncing() {
+        return mSyncTask != null;
+    }
+
+    /**
+     * 获取当前同步进度信息
+     * @return 当前同步进度字符串
+     */
+    public static String getProgressString() {
+        return mSyncProgress;
+    }
+}

src/main/java/net/micode/notes/model/Note.java

@@ -0,0 +1,430 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.model;
+import android.content.ContentProviderOperation;
+import android.content.ContentProviderResult;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.OperationApplicationException;
+import android.net.Uri;
+import android.os.RemoteException;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.CallNote;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.Notes.TextNote;
+
+import java.util.ArrayList;
+
+
+/**
+ * 笔记核心数据模型类，负责笔记的创建、更新和同步操作。
+ * <p>
+ * 该类是笔记应用的核心数据模型，提供了笔记的创建、更新和同步功能，
+ * 支持文本笔记和通话笔记两种类型，并通过ContentResolver与数据库进行交互。
+ * </p>
+ */
+public class Note {
+    /**
+     * 用于存储笔记基本属性的变更值
+     */
+    private ContentValues mNoteDiffValues;
+    
+    /**
+     * 用于存储笔记具体数据（文本或通话数据）
+     */
+    private NoteData mNoteData;
+    
+    /**
+     * 日志标签
+     */
+    private static final String TAG = Note.class.getSimpleName();
+    /**
+     * 创建新笔记并返回其ID
+     * <p>
+     * 在数据库中创建一个新的笔记记录，并返回生成的笔记ID。
+     * 新笔记将包含默认的创建时间、修改时间、类型等信息。
+     * </p>
+     * 
+     * @param context 应用上下文，用于获取ContentResolver
+     * @param folderId 笔记所属文件夹ID
+     * @return 新创建的笔记ID
+     */
+    public static synchronized long getNewNoteId(Context context, long folderId) {
+        // Create a new note in the database
+        ContentValues values = new ContentValues();
+        long createdTime = System.currentTimeMillis();
+        values.put(NoteColumns.CREATED_DATE, createdTime);
+        values.put(NoteColumns.MODIFIED_DATE, createdTime);
+        values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+        values.put(NoteColumns.PARENT_ID, folderId);
+        Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
+
+        long noteId = 0;
+        try {
+            noteId = Long.valueOf(uri.getPathSegments().get(1));
+        } catch (NumberFormatException e) {
+            Log.e(TAG, "Get note id error :" + e.toString());
+            noteId = 0;
+        }
+        if (noteId == -1) {
+            throw new IllegalStateException("Wrong note id:" + noteId);
+        }
+        return noteId;
+    }
+
+    /**
+     * 构造方法，初始化笔记数据模型
+     */
+    public Note() {
+        mNoteDiffValues = new ContentValues();
+        mNoteData = new NoteData();
+    }
+
+    /**
+     * 设置笔记的基本属性值
+     * <p>
+     * 更新笔记的基本属性，并标记为本地修改状态，同时更新修改时间。
+     * </p>
+     * 
+     * @param key 属性键名，对应NoteColumns中的字段名
+     * @param value 属性值
+     */
+    public void setNoteValue(String key, String value) {
+        mNoteDiffValues.put(key, value);
+        mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+        mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+    }
+
+    /**
+     * 设置笔记文本数据
+     * <p>
+     * 更新笔记的文本内容数据，并标记为本地修改状态。
+     * </p>
+     * 
+     * @param key 文本数据键名，对应TextNote中的字段名
+     * @param value 文本数据值
+     */
+    public void setTextData(String key, String value) {
+        mNoteData.setTextData(key, value);
+    }
+
+    /**
+     * 设置文本数据ID
+     * <p>
+     * 设置与当前笔记关联的文本数据记录ID。
+     * </p>
+     * 
+     * @param id 文本数据ID
+     */
+    public void setTextDataId(long id) {
+        mNoteData.setTextDataId(id);
+    }
+
+    /**
+     * 获取文本数据ID
+     * <p>
+     * 获取与当前笔记关联的文本数据记录ID。
+     * </p>
+     * 
+     * @return 文本数据ID
+     */
+    public long getTextDataId() {
+        return mNoteData.mTextDataId;
+    }
+
+    /**
+     * 设置通话数据ID
+     * <p>
+     * 设置与当前笔记关联的通话数据记录ID。
+     * </p>
+     * 
+     * @param id 通话数据ID
+     */
+    public void setCallDataId(long id) {
+        mNoteData.setCallDataId(id);
+    }
+
+    /**
+     * 设置通话数据
+     * <p>
+     * 更新笔记的通话内容数据，并标记为本地修改状态。
+     * </p>
+     * 
+     * @param key 通话数据键名，对应CallNote中的字段名
+     * @param value 通话数据值
+     */
+    public void setCallData(String key, String value) {
+        mNoteData.setCallData(key, value);
+    }
+
+    /**
+     * 检查笔记是否在本地被修改
+     * <p>
+     * 检查笔记的基本属性或具体数据是否在本地被修改过。
+     * </p>
+     * 
+     * @return 如果有本地修改则返回true，否则返回false
+     */
+    public boolean isLocalModified() {
+        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
+    }
+
+    /**
+     * 执行笔记同步操作，将本地修改提交到数据库
+     * <p>
+     * 将本地对笔记的修改同步到数据库中，包括基本属性和具体数据的更新。
+     * 如果同步失败，会记录错误日志但仍尝试完成数据更新。
+     * </p>
+     * 
+     * @param context 应用上下文，用于获取ContentResolver
+     * @param noteId 笔记ID
+     * @return 同步成功返回true，失败返回false
+     */
+    public boolean syncNote(Context context, long noteId) {
+        if (noteId <= 0) {
+            throw new IllegalArgumentException("Wrong note id:" + noteId);
+        }
+
+        if (!isLocalModified()) {
+            return true;
+        }
+
+        /**
+         * In theory, once data changed, the note should be updated on {@link NoteColumns#LOCAL_MODIFIED} and
+         * {@link NoteColumns#MODIFIED_DATE}. For data safety, though update note fails, we also update the
+         * note data info
+         */
+        if (context.getContentResolver().update(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
+                null) == 0) {
+            Log.e(TAG, "Update note error, should not happen");
+            // Do not return, fall through
+        }
+        mNoteDiffValues.clear();
+
+        if (mNoteData.isLocalModified()
+                && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * 笔记数据内部类，负责管理笔记的文本和通话数据。
+     * <p>
+     * 该内部类封装了笔记的具体内容数据，包括文本笔记和通话笔记，
+     * 并提供了数据的设置和持久化方法。
+     * </p>
+     */
+    private class NoteData {
+        /**
+         * 文本数据ID
+         */
+        private long mTextDataId;
+
+        /**
+         * 文本数据内容
+         */
+        private ContentValues mTextDataValues;
+
+        /**
+         * 通话数据ID
+         */
+        private long mCallDataId;
+
+        /**
+         * 通话数据内容
+         */
+        private ContentValues mCallDataValues;
+
+        /**
+         * 日志标签
+         */
+        private static final String TAG = NoteData.class.getSimpleName();
+
+        /**
+         * 构造方法，初始化笔记数据
+         */
+        public NoteData() {
+            mTextDataValues = new ContentValues();
+            mCallDataValues = new ContentValues();
+            mTextDataId = 0;
+            mCallDataId = 0;
+        }
+
+        /**
+         * 检查笔记数据是否在本地被修改
+         * <p>
+         * 检查文本数据或通话数据是否在本地被修改过。
+         * </p>
+         * 
+         * @return 如果有本地修改则返回true，否则返回false
+         */
+        boolean isLocalModified() {
+            return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
+        }
+
+        /**
+         * 设置文本数据ID
+         * <p>
+         * 设置与当前笔记关联的文本数据记录ID。
+         * </p>
+         * 
+         * @param id 文本数据ID
+         */
+        void setTextDataId(long id) {
+            if(id <= 0) {
+                throw new IllegalArgumentException("Text data id should larger than 0");
+            }
+            mTextDataId = id;
+        }
+
+        /**
+         * 设置通话数据ID
+         * <p>
+         * 设置与当前笔记关联的通话数据记录ID。
+         * </p>
+         * 
+         * @param id 通话数据ID
+         */
+        void setCallDataId(long id) {
+            if (id <= 0) {
+                throw new IllegalArgumentException("Call data id should larger than 0");
+            }
+            mCallDataId = id;
+        }
+
+        /**
+         * 设置通话数据
+         * <p>
+         * 更新笔记的通话内容数据，并标记为本地修改状态。
+         * </p>
+         * 
+         * @param key 通话数据键名，对应CallNote中的字段名
+         * @param value 通话数据值
+         */
+        void setCallData(String key, String value) {
+            mCallDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        /**
+         * 设置文本数据
+         * <p>
+         * 更新笔记的文本内容数据，并标记为本地修改状态。
+         * </p>
+         * 
+         * @param key 文本数据键名，对应TextNote中的字段名
+         * @param value 文本数据值
+         */
+        void setTextData(String key, String value) {
+            mTextDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        /**
+         * 将笔记数据推送到ContentResolver进行持久化
+         * <p>
+         * 将本地修改的文本数据或通话数据持久化到数据库中。
+         * 如果数据ID为0，则执行插入操作；否则执行更新操作。
+         * </p>
+         * 
+         * @param context 应用上下文，用于获取ContentResolver
+         * @param noteId 笔记ID
+         * @return 成功返回笔记URI，失败返回null
+         */
+        Uri pushIntoContentResolver(Context context, long noteId) {
+            /**
+             * Check for safety
+             */
+            if (noteId <= 0) {
+                throw new IllegalArgumentException("Wrong note id:" + noteId);
+            }
+
+            ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+            ContentProviderOperation.Builder builder = null;
+
+            if(mTextDataValues.size() > 0) {
+                mTextDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mTextDataId == 0) {
+                    mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE);
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                            mTextDataValues);
+                    try {
+                        setTextDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new text data fail with noteId" + noteId);
+                        mTextDataValues.clear();
+                        return null;
+                    }
+                } else {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mTextDataId));
+                    builder.withValues(mTextDataValues);
+                    operationList.add(builder.build());
+                }
+                mTextDataValues.clear();
+            }
+
+            if(mCallDataValues.size() > 0) {
+                mCallDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mCallDataId == 0) {
+                    mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE);
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                            mCallDataValues);
+                    try {
+                        setCallDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new call data fail with noteId" + noteId);
+                        mCallDataValues.clear();
+                        return null;
+                    }
+                } else {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mCallDataId));
+                    builder.withValues(mCallDataValues);
+                    operationList.add(builder.build());
+                }
+                mCallDataValues.clear();
+            }
+
+            if (operationList.size() > 0) {
+                try {
+                    ContentProviderResult[] results = context.getContentResolver().applyBatch(
+                            Notes.AUTHORITY, operationList);
+                    return (results == null || results.length == 0 || results[0] == null) ? null
+                            : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);
+                } catch (RemoteException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    return null;
+                } catch (OperationApplicationException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    return null;
+                }
+            }
+            return null;
+        }
+    }
+}

src/main/java/net/micode/notes/model/WorkingNote.java

@@ -0,0 +1,727 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.model;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentUris;
+import android.content.Context;
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.CallNote;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.Notes.TextNote;
+import net.micode.notes.tool.ResourceParser.NoteBgResources;
+
+
+/**
+ * 工作笔记类，负责管理笔记的业务逻辑和UI状态。
+ * <p>
+ * 该类是笔记应用的业务逻辑封装类，提供了笔记的创建、加载、保存等功能，
+ * 负责管理笔记的UI状态和业务逻辑，是UI层与数据层之间的桥梁。
+ * </p>
+ */
+public class WorkingNote {
+    /**
+     * 内部笔记数据对象
+     */
+    private Note mNote;
+    
+    /**
+     * 笔记ID
+     */
+    private long mNoteId;
+    
+    /**
+     * 笔记内容
+     */
+    private String mContent;
+    
+    /**
+     * 笔记模式（普通模式或清单模式）
+     */
+    private int mMode;
+
+    /**
+     * 提醒日期时间戳
+     */
+    private long mAlertDate;
+
+    /**
+     * 最后修改日期时间戳
+     */
+    private long mModifiedDate;
+
+    /**
+     * 背景颜色ID
+     */
+    private int mBgColorId;
+
+    /**
+     * 小部件ID
+     */
+    private int mWidgetId;
+
+    /**
+     * 小部件类型
+     */
+    private int mWidgetType;
+
+    /**
+     * 文件夹ID
+     */
+    private long mFolderId;
+
+    /**
+     * 应用上下文
+     */
+    private Context mContext;
+
+    /**
+     * 日志标签
+     */
+    private static final String TAG = WorkingNote.class.getSimpleName();
+
+    /**
+     * 删除标记
+     */
+    private boolean mIsDeleted;
+
+    /**
+     * 笔记设置变更监听器
+     */
+    private NoteSettingChangedListener mNoteSettingStatusListener;
+
+    /**
+     * 数据查询投影，用于从ContentResolver获取笔记数据
+     */
+    public static final String[] DATA_PROJECTION = new String[] {
+            DataColumns.ID,
+            DataColumns.CONTENT,
+            DataColumns.MIME_TYPE,
+            DataColumns.DATA1,
+            DataColumns.DATA2,
+            DataColumns.DATA3,
+            DataColumns.DATA4,
+    };
+
+    /**
+     * 笔记查询投影，用于从ContentResolver获取笔记基本信息
+     */
+    public static final String[] NOTE_PROJECTION = new String[] {
+            NoteColumns.PARENT_ID,
+            NoteColumns.ALERTED_DATE,
+            NoteColumns.BG_COLOR_ID,
+            NoteColumns.WIDGET_ID,
+            NoteColumns.WIDGET_TYPE,
+            NoteColumns.MODIFIED_DATE
+    };
+
+    /**
+     * 数据查询结果列索引：数据ID
+     */
+    private static final int DATA_ID_COLUMN = 0;
+
+    /**
+     * 数据查询结果列索引：数据内容
+     */
+    private static final int DATA_CONTENT_COLUMN = 1;
+
+    /**
+     * 数据查询结果列索引：数据类型
+     */
+    private static final int DATA_MIME_TYPE_COLUMN = 2;
+
+    /**
+     * 数据查询结果列索引：数据模式
+     */
+    private static final int DATA_MODE_COLUMN = 3;
+
+    /**
+     * 笔记查询结果列索引：父文件夹ID
+     */
+    private static final int NOTE_PARENT_ID_COLUMN = 0;
+
+    /**
+     * 笔记查询结果列索引：提醒日期
+     */
+    private static final int NOTE_ALERTED_DATE_COLUMN = 1;
+
+    /**
+     * 笔记查询结果列索引：背景颜色ID
+     */
+    private static final int NOTE_BG_COLOR_ID_COLUMN = 2;
+
+    /**
+     * 笔记查询结果列索引：小部件ID
+     */
+    private static final int NOTE_WIDGET_ID_COLUMN = 3;
+
+    /**
+     * 笔记查询结果列索引：小部件类型
+     */
+    private static final int NOTE_WIDGET_TYPE_COLUMN = 4;
+
+    /**
+     * 笔记查询结果列索引：修改日期
+     */
+    private static final int NOTE_MODIFIED_DATE_COLUMN = 5;
+
+    // New note construct
+    /**
+     * 构造新笔记的私有构造方法
+     * <p>
+     * 初始化一个新的工作笔记对象，设置默认属性值。
+     * </p>
+     * 
+     * @param context 应用上下文
+     * @param folderId 笔记所属文件夹ID
+     */
+    private WorkingNote(Context context, long folderId) {
+        mContext = context;
+        mAlertDate = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mFolderId = folderId;
+        mNote = new Note();
+        mNoteId = 0;
+        mIsDeleted = false;
+        mMode = 0;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
+    }
+
+    // Existing note construct
+    /**
+     * 构造现有笔记的私有构造方法
+     * <p>
+     * 根据笔记ID初始化一个工作笔记对象，并从数据库加载笔记数据。
+     * </p>
+     * 
+     * @param context 应用上下文
+     * @param noteId 笔记ID
+     * @param folderId 笔记所属文件夹ID
+     */
+    private WorkingNote(Context context, long noteId, long folderId) {
+        mContext = context;
+        mNoteId = noteId;
+        mFolderId = folderId;
+        mIsDeleted = false;
+        mNote = new Note();
+        loadNote();
+    }
+
+    /**
+     * 从数据库加载笔记基本信息
+     * <p>
+     * 从ContentResolver中查询并加载笔记的基本信息，包括文件夹ID、背景颜色、
+     * 小部件信息、提醒日期和修改日期等。
+     * </p>
+     */
+    private void loadNote() {
+        Cursor cursor = mContext.getContentResolver().query(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mNoteId), NOTE_PROJECTION, null,
+                null, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                mFolderId = cursor.getLong(NOTE_PARENT_ID_COLUMN);
+                mBgColorId = cursor.getInt(NOTE_BG_COLOR_ID_COLUMN);
+                mWidgetId = cursor.getInt(NOTE_WIDGET_ID_COLUMN);
+                mWidgetType = cursor.getInt(NOTE_WIDGET_TYPE_COLUMN);
+                mAlertDate = cursor.getLong(NOTE_ALERTED_DATE_COLUMN);
+                mModifiedDate = cursor.getLong(NOTE_MODIFIED_DATE_COLUMN);
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No note with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note with id " + mNoteId);
+        }
+        loadNoteData();
+    }
+
+    /**
+     * 从数据库加载笔记详细数据
+     * <p>
+     * 从ContentResolver中查询并加载笔记的详细数据，包括文本内容和模式等。
+     * </p>
+     */
+    private void loadNoteData() {
+        Cursor cursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, DATA_PROJECTION,
+                DataColumns.NOTE_ID + "=?", new String[] {
+                    String.valueOf(mNoteId)
+                }, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                do {
+                    String type = cursor.getString(DATA_MIME_TYPE_COLUMN);
+                    if (DataConstants.NOTE.equals(type)) {
+                        mContent = cursor.getString(DATA_CONTENT_COLUMN);
+                        mMode = cursor.getInt(DATA_MODE_COLUMN);
+                        mNote.setTextDataId(cursor.getLong(DATA_ID_COLUMN));
+                    } else if (DataConstants.CALL_NOTE.equals(type)) {
+                        mNote.setCallDataId(cursor.getLong(DATA_ID_COLUMN));
+                    } else {
+                        Log.d(TAG, "Wrong note type with type:" + type);
+                    }
+                } while (cursor.moveToNext());
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No data with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note's data with id " + mNoteId);
+        }
+    }
+
+    /**
+     * 创建空笔记的静态工厂方法
+     * <p>
+     * 创建一个新的空工作笔记对象，并设置默认属性值。
+     * </p>
+     * 
+     * @param context 应用上下文
+     * @param folderId 笔记所属文件夹ID
+     * @param widgetId 小部件ID
+     * @param widgetType 小部件类型
+     * @param defaultBgColorId 默认背景颜色ID
+     * @return 创建的空工作笔记
+     */
+    public static WorkingNote createEmptyNote(Context context, long folderId, int widgetId,
+            int widgetType, int defaultBgColorId) {
+        WorkingNote note = new WorkingNote(context, folderId);
+        note.setBgColorId(defaultBgColorId);
+        note.setWidgetId(widgetId);
+        note.setWidgetType(widgetType);
+        return note;
+    }
+
+    /**
+     * 加载现有笔记的静态工厂方法
+     * <p>
+     * 根据笔记ID加载一个现有的工作笔记对象。
+     * </p>
+     * 
+     * @param context 应用上下文
+     * @param id 笔记ID
+     * @return 加载的工作笔记
+     */
+    public static WorkingNote load(Context context, long id) {
+        return new WorkingNote(context, id, 0);
+    }
+
+    /**
+     * 保存笔记到数据库
+     * <p>
+     * 将当前工作笔记保存到数据库中。如果笔记不存在，则创建新笔记；
+     * 如果笔记已存在，则更新现有笔记。
+     * </p>
+     * 
+     * @return 保存成功返回true，否则返回false
+     */
+    public synchronized boolean saveNote() {
+        if (isWorthSaving()) {
+            if (!existInDatabase()) {
+                if ((mNoteId = Note.getNewNoteId(mContext, mFolderId)) == 0) {
+                    Log.e(TAG, "Create new note fail with id:" + mNoteId);
+                    return false;
+                }
+            }
+
+            mNote.syncNote(mContext, mNoteId);
+
+            /**
+             * Update widget content if there exist any widget of this note
+             */
+            if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                    && mWidgetType != Notes.TYPE_WIDGET_INVALIDE
+                    && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+            }
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * 检查笔记是否存在于数据库
+     * <p>
+     * 检查当前工作笔记是否已存在于数据库中。
+     * </p>
+     * 
+     * @return 存在返回true，否则返回false
+     */
+    public boolean existInDatabase() {
+        return mNoteId > 0;
+    }
+
+    /**
+     * 检查笔记是否值得保存
+     * <p>
+     * 检查当前工作笔记是否值得保存到数据库中。如果笔记已删除、
+     * 内容为空且不存在于数据库中，或者存在于数据库但未修改，则不值得保存。
+     * </p>
+     * 
+     * @return 值得保存返回true，否则返回false
+     */
+    private boolean isWorthSaving() {
+        if (mIsDeleted || (!existInDatabase() && TextUtils.isEmpty(mContent))
+                || (existInDatabase() && !mNote.isLocalModified())) {
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    /**
+     * 设置笔记设置变更监听器
+     * <p>
+     * 设置笔记设置变更监听器，用于监听笔记设置的变化，如背景颜色、
+     * 提醒日期、小部件等的变化。
+     * </p>
+     * 
+     * @param l 监听器实例
+     */
+    public void setOnSettingStatusChangedListener(NoteSettingChangedListener l) {
+        mNoteSettingStatusListener = l;
+    }
+
+    /**
+     * 设置提醒日期
+     * <p>
+     * 设置笔记的提醒日期，并通知监听器。
+     * </p>
+     * 
+     * @param date 提醒日期时间戳
+     * @param set 是否设置提醒
+     */
+    public void setAlertDate(long date, boolean set) {
+        if (date != mAlertDate) {
+            mAlertDate = date;
+            mNote.setNoteValue(NoteColumns.ALERTED_DATE, String.valueOf(mAlertDate));
+        }
+        if (mNoteSettingStatusListener != null) {
+            mNoteSettingStatusListener.onClockAlertChanged(date, set);
+        }
+    }
+
+    /**
+     * 标记笔记是否删除
+     * <p>
+     * 标记笔记是否已删除，并通知监听器。
+     * </p>
+     * 
+     * @param mark 删除标记
+     */
+    public void markDeleted(boolean mark) {
+        mIsDeleted = mark;
+        if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                && mWidgetType != Notes.TYPE_WIDGET_INVALIDE && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+        }
+    }
+
+    /**
+     * 设置笔记背景颜色ID
+     * <p>
+     * 设置笔记的背景颜色ID，并通知监听器。
+     * </p>
+     * 
+     * @param id 背景颜色ID
+     */
+    public void setBgColorId(int id) {
+        if (id != mBgColorId) {
+            mBgColorId = id;
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onBackgroundColorChanged();
+            }
+            mNote.setNoteValue(NoteColumns.BG_COLOR_ID, String.valueOf(id));
+        }
+    }
+
+    /**
+     * 设置笔记的清单模式
+     * <p>
+     * 设置笔记的模式（普通模式或清单模式），并通知监听器。
+     * </p>
+     * 
+     * @param mode 清单模式
+     */
+    public void setCheckListMode(int mode) {
+        if (mMode != mode) {
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onCheckListModeChanged(mMode, mode);
+            }
+            mMode = mode;
+            mNote.setTextData(TextNote.MODE, String.valueOf(mMode));
+        }
+    }
+
+    /**
+     * 设置小部件类型
+     * <p>
+     * 设置与当前笔记关联的小部件类型。
+     * </p>
+     * 
+     * @param type 小部件类型
+     */
+    public void setWidgetType(int type) {
+        if (type != mWidgetType) {
+            mWidgetType = type;
+            mNote.setNoteValue(NoteColumns.WIDGET_TYPE, String.valueOf(mWidgetType));
+        }
+    }
+
+    /**
+     * 设置小部件ID
+     * <p>
+     * 设置与当前笔记关联的小部件ID。
+     * </p>
+     * 
+     * @param id 小部件ID
+     */
+    public void setWidgetId(int id) {
+        if (id != mWidgetId) {
+            mWidgetId = id;
+            mNote.setNoteValue(NoteColumns.WIDGET_ID, String.valueOf(mWidgetId));
+        }
+    }
+
+    /**
+     * 设置笔记内容
+     * <p>
+     * 设置笔记的文本内容。
+     * </p>
+     * 
+     * @param text 笔记内容
+     */
+    public void setWorkingText(String text) {
+        if (!TextUtils.equals(mContent, text)) {
+            mContent = text;
+            mNote.setTextData(DataColumns.CONTENT, mContent);
+        }
+    }
+
+    /**
+     * 将笔记转换为通话笔记
+     * <p>
+     * 将当前笔记转换为通话笔记，并设置通话相关信息，如电话号码和通话日期。
+     * </p>
+     * 
+     * @param phoneNumber 电话号码
+     * @param callDate 通话日期
+     */
+    public void convertToCallNote(String phoneNumber, long callDate) {
+        mNote.setCallData(CallNote.CALL_DATE, String.valueOf(callDate));
+        mNote.setCallData(CallNote.PHONE_NUMBER, phoneNumber);
+        mNote.setNoteValue(NoteColumns.PARENT_ID, String.valueOf(Notes.ID_CALL_RECORD_FOLDER));
+    }
+
+    /**
+     * 检查笔记是否有闹钟提醒
+     * <p>
+     * 检查当前笔记是否设置了提醒日期。
+     * </p>
+     * 
+     * @return 有提醒返回true，否则返回false
+     */
+    public boolean hasClockAlert() {
+        return (mAlertDate > 0 ? true : false);
+    }
+
+    /**
+     * 获取笔记内容
+     * <p>
+     * 获取当前笔记的文本内容。
+     * </p>
+     * 
+     * @return 笔记内容
+     */
+    public String getContent() {
+        return mContent;
+    }
+
+    /**
+     * 获取提醒日期
+     * <p>
+     * 获取当前笔记的提醒日期时间戳。
+     * </p>
+     * 
+     * @return 提醒日期时间戳
+     */
+    public long getAlertDate() {
+        return mAlertDate;
+    }
+
+    /**
+     * 获取修改日期
+     * <p>
+     * 获取当前笔记的最后修改日期时间戳。
+     * </p>
+     * 
+     * @return 修改日期时间戳
+     */
+    public long getModifiedDate() {
+        return mModifiedDate;
+    }
+
+    /**
+     * 获取背景颜色资源ID
+     * <p>
+     * 根据背景颜色ID获取对应的背景颜色资源ID。
+     * </p>
+     * 
+     * @return 背景颜色资源ID
+     */
+    public int getBgColorResId() {
+        return NoteBgResources.getNoteBgResource(mBgColorId);
+    }
+
+    /**
+     * 获取背景颜色ID
+     * <p>
+     * 获取当前笔记的背景颜色ID。
+     * </p>
+     * 
+     * @return 背景颜色ID
+     */
+    public int getBgColorId() {
+        return mBgColorId;
+    }
+
+    /**
+     * 获取标题背景资源ID
+     * <p>
+     * 根据背景颜色ID获取对应的标题背景资源ID。
+     * </p>
+     * 
+     * @return 标题背景资源ID
+     */
+    public int getTitleBgResId() {
+        return NoteBgResources.getNoteTitleBgResource(mBgColorId);
+    }
+
+    /**
+     * 获取清单模式
+     * <p>
+     * 获取当前笔记的模式（普通模式或清单模式）。
+     * </p>
+     * 
+     * @return 清单模式
+     */
+    public int getCheckListMode() {
+        return mMode;
+    }
+
+    /**
+     * 获取笔记ID
+     * <p>
+     * 获取当前笔记的ID。
+     * </p>
+     * 
+     * @return 笔记ID
+     */
+    public long getNoteId() {
+        return mNoteId;
+    }
+
+    /**
+     * 获取文件夹ID
+     * <p>
+     * 获取当前笔记所属的文件夹ID。
+     * </p>
+     * 
+     * @return 文件夹ID
+     */
+    public long getFolderId() {
+        return mFolderId;
+    }
+
+    /**
+     * 获取小部件ID
+     * <p>
+     * 获取与当前笔记关联的小部件ID。
+     * </p>
+     * 
+     * @return 小部件ID
+     */
+    public int getWidgetId() {
+        return mWidgetId;
+    }
+
+    /**
+     * 获取小部件类型
+     * <p>
+     * 获取与当前笔记关联的小部件类型。
+     * </p>
+     * 
+     * @return 小部件类型
+     */
+    public int getWidgetType() {
+        return mWidgetType;
+    }
+
+    /**
+     * 笔记设置变更监听器，用于监听笔记设置的变化。
+     * <p>
+     * 该接口定义了笔记设置变化的回调方法，如背景颜色、提醒日期、
+     * 小部件等的变化回调。
+     * </p>
+     */
+    public interface NoteSettingChangedListener {
+        /**
+         * 当笔记背景颜色改变时调用
+         * <p>
+         * 当笔记的背景颜色发生变化时，会调用该方法。
+         * </p>
+         */
+        void onBackgroundColorChanged();
+
+        /**
+         * 当笔记闹钟设置改变时调用
+         * <p>
+         * 当笔记的提醒日期发生变化时，会调用该方法。
+         * </p>
+         * 
+         * @param date 闹钟日期时间戳
+         * @param set 是否设置闹钟
+         */
+        void onClockAlertChanged(long date, boolean set);
+
+        /**
+         * 当笔记小部件改变时调用
+         * <p>
+         * 当与笔记关联的小部件发生变化时，会调用该方法。
+         * </p>
+         */
+        void onWidgetChanged();
+
+        /**
+         * 当笔记在清单模式和普通模式之间切换时调用
+         * <p>
+         * 当笔记的模式在普通模式和清单模式之间切换时，会调用该方法。
+         * </p>
+         * 
+         * @param oldMode 切换前的模式
+         * @param newMode 切换后的新模式
+         */
+        void onCheckListModeChanged(int oldMode, int newMode);
+    }
+}

src/main/java/net/micode/notes/tool/BackupUtils.java

@@ -0,0 +1,490 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.os.Environment;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
+
+/**
+ * 备份工具类，负责将笔记导出为文本文件。
+ * <p>
+ * 该类采用单例模式实现，提供了将笔记内容导出为用户可读文本格式的功能，
+ * 支持将不同文件夹的笔记分类导出，并处理SD卡状态检查和文件生成等操作。
+ * </p>
+ */
+public class BackupUtils {
+    /**
+     * 日志标签
+     */
+    private static final String TAG = BackupUtils.class.getSimpleName();
+    /**
+     * 单例实例
+     */
+    private static BackupUtils sInstance;
+
+    /**
+     * 获取BackupUtils的单例实例
+     * <p>
+     * 如果实例不存在，则创建一个新实例并返回；否则返回已存在的实例。
+     * </p>
+     * 
+     * @param context 应用上下文
+     * @return BackupUtils的单例实例
+     */
+    public static synchronized BackupUtils getInstance(Context context) {
+        if (sInstance == null) {
+            sInstance = new BackupUtils(context);
+        }
+        return sInstance;
+    }
+
+    /**
+     * 备份或恢复操作的状态常量
+     * <p>
+     * 这些状态常量用于表示备份或恢复操作的执行结果和状态。
+     * </p>
+     */
+    /**
+     * SD卡未挂载状态
+     */
+    public static final int STATE_SD_CARD_UNMOUONTED           = 0;
+    
+    /**
+     * 备份文件不存在状态
+     */
+    public static final int STATE_BACKUP_FILE_NOT_EXIST        = 1;
+    
+    /**
+     * 数据格式损坏状态，可能被其他程序修改
+     */
+    public static final int STATE_DATA_DESTROIED               = 2;
+    
+    /**
+     * 运行时异常导致备份或恢复失败状态
+     */
+    public static final int STATE_SYSTEM_ERROR                 = 3;
+    
+    /**
+     * 备份或恢复成功状态
+     */
+    public static final int STATE_SUCCESS                      = 4;
+
+    /**
+     * 文本导出实例，负责实际的文本导出操作
+     */
+    private TextExport mTextExport;
+
+    /**
+     * 私有构造方法，初始化BackupUtils实例
+     * <p>
+     * 创建TextExport实例用于文本导出操作。
+     * </p>
+     * 
+     * @param context 应用上下文
+     */
+    private BackupUtils(Context context) {
+        mTextExport = new TextExport(context);
+    }
+
+    /**
+     * 检查外部存储是否可用
+     * <p>
+     * 判断SD卡是否已挂载并可读写。
+     * </p>
+     * 
+     * @return 如果外部存储可用返回true，否则返回false
+     */
+    private static boolean externalStorageAvailable() {
+        return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
+    }
+
+    /**
+     * 将笔记导出为文本文件
+     * <p>
+     * 调用内部TextExport实例的exportToText方法执行实际导出操作。
+     * </p>
+     * 
+     * @return 导出操作的状态码，可能的值为STATE_SD_CARD_UNMOUONTED、STATE_SYSTEM_ERROR或STATE_SUCCESS
+     */
+    public int exportToText() {
+        return mTextExport.exportToText();
+    }
+
+    /**
+     * 获取导出的文本文件名
+     * <p>
+     * 返回最近一次导出操作生成的文本文件名。
+     * </p>
+     * 
+     * @return 导出的文本文件名
+     */
+    public String getExportedTextFileName() {
+        return mTextExport.mFileName;
+    }
+
+    /**
+     * 获取导出的文本文件目录
+     * <p>
+     * 返回导出文本文件的存储目录路径。
+     * </p>
+     * 
+     * @return 导出的文本文件目录路径
+     */
+    public String getExportedTextFileDir() {
+        return mTextExport.mFileDirectory;
+    }
+
+    /**
+     * 文本导出内部类，负责实际的笔记文本导出操作。
+     * <p>
+     * 该内部类实现了将笔记内容导出为用户可读文本格式的功能，
+     * 支持按文件夹分类导出，并处理文件生成和内容格式化等操作。
+     * </p>
+     */
+    private static class TextExport {
+        private static final String[] NOTE_PROJECTION = {
+                NoteColumns.ID,
+                NoteColumns.MODIFIED_DATE,
+                NoteColumns.SNIPPET,
+                NoteColumns.TYPE
+        };
+
+        private static final int NOTE_COLUMN_ID = 0;
+
+        private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
+
+        private static final int NOTE_COLUMN_SNIPPET = 2;
+
+        private static final String[] DATA_PROJECTION = {
+                DataColumns.CONTENT,
+                DataColumns.MIME_TYPE,
+                DataColumns.DATA1,
+                DataColumns.DATA2,
+                DataColumns.DATA3,
+                DataColumns.DATA4,
+        };
+
+        private static final int DATA_COLUMN_CONTENT = 0;
+
+        private static final int DATA_COLUMN_MIME_TYPE = 1;
+
+        private static final int DATA_COLUMN_CALL_DATE = 2;
+
+        private static final int DATA_COLUMN_PHONE_NUMBER = 4;
+
+        /**
+         * 文本格式化字符串数组，从资源文件中加载
+         */
+        private final String [] TEXT_FORMAT;
+        private static final int FORMAT_FOLDER_NAME          = 0;
+        private static final int FORMAT_NOTE_DATE            = 1;
+        private static final int FORMAT_NOTE_CONTENT         = 2;
+
+        /**
+         * 应用上下文
+         */
+        private Context mContext;
+        /**
+         * 导出的文件名
+         */
+        private String mFileName;
+        /**
+         * 导出的文件目录
+         */
+        private String mFileDirectory;
+
+        /**
+         * 构造方法，初始化TextExport实例
+         * <p>
+         * 从资源文件中加载文本格式化字符串，并初始化上下文和文件信息。
+         * </p>
+         * 
+         * @param context 应用上下文
+         */
+        public TextExport(Context context) {
+            TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
+            mContext = context;
+            mFileName = "";
+            mFileDirectory = "";
+        }
+
+        /**
+         * 获取指定ID的文本格式化字符串
+         * <p>
+         * 从TEXT_FORMAT数组中获取指定索引的格式化字符串。
+         * </p>
+         * 
+         * @param id 格式化字符串的索引
+         * @return 对应的格式化字符串
+         */
+        private String getFormat(int id) {
+            return TEXT_FORMAT[id];
+        }
+
+        /**
+         * 将指定文件夹的笔记导出为文本
+         * <p>
+         * 查询并导出指定文件夹下的所有笔记，包括每个笔记的修改日期和内容。
+         * </p>
+         * 
+         * @param folderId 文件夹ID
+         * @param ps 输出流，用于写入导出的文本内容
+         */
+        private void exportFolderToText(String folderId, PrintStream ps) {
+            // Query notes belong to this folder
+            Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
+                        folderId
+                    }, null);
+
+            if (notesCursor != null) {
+                if (notesCursor.moveToFirst()) {
+                    do {
+                        // Print note's last modified date
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // Query data belong to this note
+                        String noteId = notesCursor.getString(NOTE_COLUMN_ID);
+                        exportNoteToText(noteId, ps);
+                    } while (notesCursor.moveToNext());
+                }
+                notesCursor.close();
+            }
+        }
+
+        /**
+         * 将指定笔记导出到打印流
+         * <p>
+         * 查询并导出指定笔记的详细内容，区分文本笔记和通话笔记的不同格式。
+         * </p>
+         * 
+         * @param noteId 笔记ID
+         * @param ps 打印流，用于写入导出的笔记内容
+         */
+        private void exportNoteToText(String noteId, PrintStream ps) {
+            Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI,
+                    DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
+                        noteId
+                    }, null);
+
+            if (dataCursor != null) {
+                if (dataCursor.moveToFirst()) {
+                    do {
+                        String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
+                        if (DataConstants.CALL_NOTE.equals(mimeType)) {
+                            // Print phone number
+                            String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
+                            long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
+                            String location = dataCursor.getString(DATA_COLUMN_CONTENT);
+
+                            if (!TextUtils.isEmpty(phoneNumber)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        phoneNumber));
+                            }
+                            // Print call date
+                            ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
+                                    .format(mContext.getString(R.string.format_datetime_mdhm),
+                                            callDate)));
+                            // Print call attachment location
+                            if (!TextUtils.isEmpty(location)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        location));
+                            }
+                        } else if (DataConstants.NOTE.equals(mimeType)) {
+                            String content = dataCursor.getString(DATA_COLUMN_CONTENT);
+                            if (!TextUtils.isEmpty(content)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        content));
+                            }
+                        }
+                    } while (dataCursor.moveToNext());
+                }
+                dataCursor.close();
+            }
+            // print a line separator between note
+            try {
+                ps.write(new byte[] {
+                        Character.LINE_SEPARATOR, Character.LETTER_NUMBER
+                });
+            } catch (IOException e) {
+                Log.e(TAG, e.toString());
+            }
+        }
+
+        /**
+         * 将笔记导出为用户可读的文本格式
+         * <p>
+         * 检查SD卡状态，创建输出文件，然后按文件夹分类导出所有笔记内容。
+         * </p>
+         * 
+         * @return 导出操作的状态码，可能的值为STATE_SD_CARD_UNMOUONTED、STATE_SYSTEM_ERROR或STATE_SUCCESS
+         */
+        public int exportToText() {
+            if (!externalStorageAvailable()) {
+                Log.d(TAG, "Media was not mounted");
+                return STATE_SD_CARD_UNMOUONTED;
+            }
+
+            PrintStream ps = getExportToTextPrintStream();
+            if (ps == null) {
+                Log.e(TAG, "get print stream error");
+                return STATE_SYSTEM_ERROR;
+            }
+            // First export folder and its notes
+            Cursor folderCursor = mContext.getContentResolver().query(
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    "(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
+                            + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
+                            + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);
+
+            if (folderCursor != null) {
+                if (folderCursor.moveToFirst()) {
+                    do {
+                        // Print folder's name
+                        String folderName = "";
+                        if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {
+                            folderName = mContext.getString(R.string.call_record_folder_name);
+                        } else {
+                            folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);
+                        }
+                        if (!TextUtils.isEmpty(folderName)) {
+                            ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
+                        }
+                        String folderId = folderCursor.getString(NOTE_COLUMN_ID);
+                        exportFolderToText(folderId, ps);
+                    } while (folderCursor.moveToNext());
+                }
+                folderCursor.close();
+            }
+
+            // Export notes in root's folder
+            Cursor noteCursor = mContext.getContentResolver().query(
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
+                            + "=0", null, null);
+
+            if (noteCursor != null) {
+                if (noteCursor.moveToFirst()) {
+                    do {
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // Query data belong to this note
+                        String noteId = noteCursor.getString(NOTE_COLUMN_ID);
+                        exportNoteToText(noteId, ps);
+                    } while (noteCursor.moveToNext());
+                }
+                noteCursor.close();
+            }
+            ps.close();
+
+            return STATE_SUCCESS;
+        }
+
+        /**
+         * 获取用于导出文本的打印流
+         * <p>
+         * 创建并返回指向导出文本文件的打印流，用于写入导出的笔记内容。
+         * </p>
+         * 
+         * @return 指向导出文本文件的打印流，如果创建失败返回null
+         */
+        private PrintStream getExportToTextPrintStream() {
+            File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
+                    R.string.file_name_txt_format);
+            if (file == null) {
+                Log.e(TAG, "create file to exported failed");
+                return null;
+            }
+            mFileName = file.getName();
+            mFileDirectory = mContext.getString(R.string.file_path);
+            PrintStream ps = null;
+            try {
+                FileOutputStream fos = new FileOutputStream(file);
+                ps = new PrintStream(fos);
+            } catch (FileNotFoundException e) {
+                e.printStackTrace();
+                return null;
+            } catch (NullPointerException e) {
+                e.printStackTrace();
+                return null;
+            }
+            return ps;
+        }
+    }
+
+    /**
+     * 在SD卡上生成用于存储导入数据的文本文件
+     * <p>
+     * 根据指定的文件路径和文件名格式，在SD卡上创建相应的目录和文件。
+     * </p>
+     * 
+     * @param context 应用上下文
+     * @param filePathResId 文件路径资源ID
+     * @param fileNameFormatResId 文件名格式资源ID
+     * @return 创建的文件对象，如果创建失败返回null
+     */
+    private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(Environment.getExternalStorageDirectory());
+        sb.append(context.getString(filePathResId));
+        File filedir = new File(sb.toString());
+        sb.append(context.getString(
+                fileNameFormatResId,
+                DateFormat.format(context.getString(R.string.format_date_ymd),
+                        System.currentTimeMillis())));
+        File file = new File(sb.toString());
+
+        try {
+            if (!filedir.exists()) {
+                filedir.mkdir();
+            }
+            if (!file.exists()) {
+                file.createNewFile();
+            }
+            return file;
+        } catch (SecurityException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+}
+
+

src/main/java/net/micode/notes/tool/DataUtils.java

@@ -0,0 +1,437 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+import android.content.ContentProviderOperation;
+import android.content.ContentProviderResult;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.OperationApplicationException;
+import android.database.Cursor;
+import android.os.RemoteException;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.CallNote;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+
+
+/**
+ * 数据工具类，提供笔记数据的批量操作和查询功能。
+ * <p>
+ * 该类包含了笔记数据的批量删除、移动、查询等静态方法，
+ * 主要用于处理笔记应用中的数据操作，与ContentResolver进行交互。
+ * </p>
+ */
+public class DataUtils {
+    /**
+     * 日志标签
+     */
+    public static final String TAG = DataUtils.class.getSimpleName();
+    /**
+     * 批量删除笔记
+     * <p>
+     * 根据提供的笔记ID集合，批量删除对应的笔记。
+     * 系统根文件夹（ID_ROOT_FOLDER）不会被删除。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param ids 要删除的笔记ID集合
+     * @return 删除成功返回true，否则返回false
+     */
+    public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {
+        if (ids == null) {
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+        if (ids.size() == 0) {
+            Log.d(TAG, "no id is in the hashset");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        for (long id : ids) {
+            if(id == Notes.ID_ROOT_FOLDER) {
+                Log.e(TAG, "Don't delete system folder root");
+                continue;
+            }
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            operationList.add(builder.build());
+        }
+        try {
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        return false;
+    }
+
+    /**
+     * 将笔记移动到指定文件夹
+     * <p>
+     * 更新笔记的父文件夹ID和原始父文件夹ID，并标记为本地修改。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param id 要移动的笔记ID
+     * @param srcFolderId 源文件夹ID
+     * @param desFolderId 目标文件夹ID
+     */
+    public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.PARENT_ID, desFolderId);
+        values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);
+    }
+
+    /**
+     * 批量将笔记移动到指定文件夹
+     * <p>
+     * 根据提供的笔记ID集合，批量更新笔记的父文件夹ID。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param ids 要移动的笔记ID集合
+     * @param folderId 目标文件夹ID
+     * @return 移动成功返回true，否则返回false
+     */
+    public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
+            long folderId) {
+        if (ids == null) {
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        for (long id : ids) {
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            builder.withValue(NoteColumns.PARENT_ID, folderId);
+            builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
+            operationList.add(builder.build());
+        }
+
+        try {
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        return false;
+    }
+
+    /**
+     * 获取用户文件夹数量
+     * <p>
+     * 查询并返回除系统文件夹外的所有用户文件夹数量。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @return 用户文件夹数量
+     */
+    public static int getUserFolderCount(ContentResolver resolver) {
+        Cursor cursor =resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { "COUNT(*)" },
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
+                null);
+
+        int count = 0;
+        if(cursor != null) {
+            if(cursor.moveToFirst()) {
+                try {
+                    count = cursor.getInt(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "get folder count failed:" + e.toString());
+                } finally {
+                    cursor.close();
+                }
+            }
+        }
+        return count;
+    }
+
+    /**
+     * 检查笔记在数据库中是否可见
+     * <p>
+     * 检查指定ID和类型的笔记是否存在于数据库中，且不在垃圾箱中。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param noteId 笔记ID
+     * @param type 笔记类型
+     * @return 可见返回true，否则返回false
+     */
+    public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null,
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
+                new String [] {String.valueOf(type)},
+                null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 检查笔记是否存在于数据库中
+     * <p>
+     * 根据笔记ID检查笔记是否存在于数据库中。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param noteId 笔记ID
+     * @return 存在返回true，否则返回false
+     */
+    public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 检查数据是否存在于数据库中
+     * <p>
+     * 根据数据ID检查数据是否存在于数据库中。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param dataId 数据ID
+     * @return 存在返回true，否则返回false
+     */
+    public static boolean existInDataDatabase(ContentResolver resolver, long dataId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 检查可见文件夹名称是否存在
+     * <p>
+     * 检查指定名称的文件夹是否存在于数据库中，且不在垃圾箱中。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param name 文件夹名称
+     * @return 存在返回true，否则返回false
+     */
+    public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null,
+                NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER +
+                " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
+                " AND " + NoteColumns.SNIPPET + "=?",
+                new String[] { name }, null);
+        boolean exist = false;
+        if(cursor != null) {
+            if(cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 获取文件夹中笔记的小部件属性
+     * <p>
+     * 查询并返回指定文件夹下所有笔记的小部件ID和类型。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param folderId 文件夹ID
+     * @return 小部件属性集合，如果没有则返回null
+     */
+    public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
+        Cursor c = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
+                NoteColumns.PARENT_ID + "=?",
+                new String[] { String.valueOf(folderId) },
+                null);
+
+        HashSet<AppWidgetAttribute> set = null;
+        if (c != null) {
+            if (c.moveToFirst()) {
+                set = new HashSet<AppWidgetAttribute>();
+                do {
+                    try {
+                        AppWidgetAttribute widget = new AppWidgetAttribute();
+                        widget.widgetId = c.getInt(0);
+                        widget.widgetType = c.getInt(1);
+                        set.add(widget);
+                    } catch (IndexOutOfBoundsException e) {
+                        Log.e(TAG, e.toString());
+                    }
+                } while (c.moveToNext());
+            }
+            c.close();
+        }
+        return set;
+    }
+
+    /**
+     * 根据笔记ID获取电话号码
+     * <p>
+     * 查询并返回通话笔记中存储的电话号码。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param noteId 通话笔记ID
+     * @return 电话号码，如果没有则返回空字符串
+     */
+    public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.PHONE_NUMBER },
+                CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?",
+                new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE },
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                return cursor.getString(0);
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, "Get call number fails " + e.toString());
+            } finally {
+                cursor.close();
+            }
+        }
+        return "";
+    }
+
+    /**
+     * 根据电话号码和通话日期获取笔记ID
+     * <p>
+     * 查询并返回匹配指定电话号码和通话日期的通话笔记ID。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param phoneNumber 电话号码
+     * @param callDate 通话日期时间戳
+     * @return 笔记ID，如果没有找到则返回0
+     */
+    public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.NOTE_ID },
+                CallNote.CALL_DATE + "=? AND " + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
+                + CallNote.PHONE_NUMBER + ",?)",
+                new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
+                null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                try {
+                    return cursor.getLong(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "Get call note id fails " + e.toString());
+                }
+            }
+            cursor.close();
+        }
+        return 0;
+    }
+
+    /**
+     * 根据笔记ID获取摘要
+     * <p>
+     * 查询并返回指定笔记ID的摘要内容。
+     * 如果笔记不存在，将抛出IllegalArgumentException异常。
+     * </p>
+     * 
+     * @param resolver ContentResolver实例，用于与内容提供者交互
+     * @param noteId 笔记ID
+     * @return 笔记摘要
+     * @throws IllegalArgumentException 如果笔记不存在
+     */
+    public static String getSnippetById(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String [] { NoteColumns.SNIPPET },
+                NoteColumns.ID + "=?",
+                new String [] { String.valueOf(noteId)},
+                null);
+
+        if (cursor != null) {
+            String snippet = "";
+            if (cursor.moveToFirst()) {
+                snippet = cursor.getString(0);
+            }
+            cursor.close();
+            return snippet;
+        }
+        throw new IllegalArgumentException("Note is not found with id: " + noteId);
+    }
+
+    /**
+     * 格式化笔记摘要
+     * <p>
+     * 对笔记摘要进行格式化处理，去除首尾空格，并只保留第一行内容。
+     * </p>
+     * 
+     * @param snippet 原始摘要内容
+     * @return 格式化后的摘要内容
+     */
+    public static String getFormattedSnippet(String snippet) {
+        if (snippet != null) {
+            snippet = snippet.trim();
+            int index = snippet.indexOf('\n');
+            if (index != -1) {
+                snippet = snippet.substring(0, index);
+            }
+        }
+        return snippet;
+    }
+}

src/main/java/net/micode/notes/tool/GTaskStringUtils.java

@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+/**
+ * GTask字符串常量工具类，定义了与GTask服务交互时使用的各种JSON字段名和文件夹名称。
+ * <p>
+ * 该类包含了与Google任务服务(GTask)进行JSON数据交换时所需的所有字符串常量，
+ * 包括动作类型、实体类型、字段名称以及文件夹命名规则等。
+ * </p>
+ */
+public class GTaskStringUtils {
+
+    /** 动作ID字段名 */
+    public final static String GTASK_JSON_ACTION_ID = "action_id";
+
+    /** 动作列表字段名 */
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";
+
+    /** 动作类型字段名 */
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";
+
+    /** 创建动作类型 */
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";
+
+    /** 获取所有数据动作类型 */
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+
+    /** 移动动作类型 */
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";
+
+    /** 更新动作类型 */
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";
+
+    /** 创建者ID字段名 */
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";
+
+    /** 子实体字段名 */
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";
+
+    /** 客户端版本字段名 */
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";
+
+    /** 完成状态字段名 */
+    public final static String GTASK_JSON_COMPLETED = "completed";
+
+    /** 当前列表ID字段名 */
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";
+
+    /** 默认列表ID字段名 */
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";
+
+    /** 删除状态字段名 */
+    public final static String GTASK_JSON_DELETED = "deleted";
+
+    /** 目标列表字段名 */
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+
+    /** 目标父级字段名 */
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+
+    /** 目标父级类型字段名 */
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+
+    /** 实体增量字段名 */
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+
+    /** 实体类型字段名 */
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+
+    /** 获取已删除数据字段名 */
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+
+    /** ID字段名 */
+    public final static String GTASK_JSON_ID = "id";
+
+    /** 索引字段名 */
+    public final static String GTASK_JSON_INDEX = "index";
+
+    /** 最后修改时间字段名 */
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+
+    /** 最新同步点字段名 */
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+
+    /** 列表ID字段名 */
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+
+    /** 列表集合字段名 */
+    public final static String GTASK_JSON_LISTS = "lists";
+
+    /** 名称字段名 */
+    public final static String GTASK_JSON_NAME = "name";
+
+    /** 新ID字段名 */
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+
+    /** 笔记字段名 */
+    public final static String GTASK_JSON_NOTES = "notes";
+
+    /** 父级ID字段名 */
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";
+
+    /** 前一个兄弟节点ID字段名 */
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+
+    /** 结果集合字段名 */
+    public final static String GTASK_JSON_RESULTS = "results";
+
+    /** 源列表字段名 */
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+
+    /** 任务集合字段名 */
+    public final static String GTASK_JSON_TASKS = "tasks";
+
+    /** 类型字段名 */
+    public final static String GTASK_JSON_TYPE = "type";
+
+    /** 分组类型 */
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+
+    /** 任务类型 */
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";
+
+    /** 用户字段名 */
+    public final static String GTASK_JSON_USER = "user";
+
+    /** MIUI笔记文件夹前缀 */
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+
+    /** 默认文件夹名称 */
+    public final static String FOLDER_DEFAULT = "Default";
+
+    /** 通话笔记文件夹名称 */
+    public final static String FOLDER_CALL_NOTE = "Call_Note";
+
+    /** 元数据文件夹名称 */
+    public final static String FOLDER_META = "METADATA";
+
+    /** GTask ID元数据头 */
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+
+    /** 笔记元数据头 */
+    public final static String META_HEAD_NOTE = "meta_note";
+
+    /** 数据元数据头 */
+    public final static String META_HEAD_DATA = "meta_data";
+
+    /** 元数据笔记名称 */
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+
+}

src/main/java/net/micode/notes/tool/ResourceParser.java

@@ -0,0 +1,296 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+import android.content.Context;
+import android.preference.PreferenceManager;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+/**
+ * 资源解析工具类，管理笔记应用中使用的各种资源配置和常量。
+ * <p>
+ * 该类包含了笔记的背景颜色、字体大小等常量定义，以及管理笔记背景、
+ * 列表项背景、小部件背景和文本外观等资源的内部类。
+ * </p>
+ */
+public class ResourceParser {
+
+    /** 黄色背景ID */
+    public static final int YELLOW           = 0;
+    /** 蓝色背景ID */
+    public static final int BLUE             = 1;
+    /** 白色背景ID */
+    public static final int WHITE            = 2;
+    /** 绿色背景ID */
+    public static final int GREEN            = 3;
+    /** 红色背景ID */
+    public static final int RED              = 4;
+
+    /** 默认背景颜色ID */
+    public static final int BG_DEFAULT_COLOR = YELLOW;
+
+    /** 小字体大小ID */
+    public static final int TEXT_SMALL       = 0;
+    /** 中字体大小ID */
+    public static final int TEXT_MEDIUM      = 1;
+    /** 大字体大小ID */
+    public static final int TEXT_LARGE       = 2;
+    /** 超大字体大小ID */
+    public static final int TEXT_SUPER       = 3;
+
+    /** 默认字体大小ID */
+    public static final int BG_DEFAULT_FONT_SIZE = TEXT_MEDIUM;
+
+    /**
+     * 笔记背景资源管理类，提供笔记编辑界面的背景和标题背景资源。
+     */
+    public static class NoteBgResources {
+        /** 笔记编辑背景资源数组 */
+        private final static int [] BG_EDIT_RESOURCES = new int [] {
+            R.drawable.edit_yellow,
+            R.drawable.edit_blue,
+            R.drawable.edit_white,
+            R.drawable.edit_green,
+            R.drawable.edit_red
+        };
+
+        /** 笔记编辑标题背景资源数组 */
+        private final static int [] BG_EDIT_TITLE_RESOURCES = new int [] {
+            R.drawable.edit_title_yellow,
+            R.drawable.edit_title_blue,
+            R.drawable.edit_title_white,
+            R.drawable.edit_title_green,
+            R.drawable.edit_title_red
+        };
+
+        /**
+         * 获取笔记背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getNoteBgResource(int id) {
+            return BG_EDIT_RESOURCES[id];
+        }
+
+        /**
+         * 获取笔记标题背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的标题背景资源ID
+         */
+        public static int getNoteTitleBgResource(int id) {
+            return BG_EDIT_TITLE_RESOURCES[id];
+        }
+    }
+
+    /**
+     * 获取默认的笔记背景颜色ID
+     * <p>
+     * 根据用户设置决定返回固定默认颜色还是随机颜色。
+     * </p>
+     * 
+     * @param context 上下文对象
+     * @return 默认的背景颜色ID
+     */
+    public static int getDefaultBgId(Context context) {
+        if (PreferenceManager.getDefaultSharedPreferences(context).getBoolean(
+                NotesPreferenceActivity.PREFERENCE_SET_BG_COLOR_KEY, false)) {
+            return (int) (Math.random() * NoteBgResources.BG_EDIT_RESOURCES.length);
+        } else {
+            return BG_DEFAULT_COLOR;
+        }
+    }
+
+    /**
+     * 笔记列表项背景资源管理类，提供笔记列表中不同位置项的背景资源。
+     */
+    public static class NoteItemBgResources {
+        /** 列表第一项背景资源数组 */
+        private final static int [] BG_FIRST_RESOURCES = new int [] {
+            R.drawable.list_yellow_up,
+            R.drawable.list_blue_up,
+            R.drawable.list_white_up,
+            R.drawable.list_green_up,
+            R.drawable.list_red_up
+        };
+
+        /** 列表中间项背景资源数组 */
+        private final static int [] BG_NORMAL_RESOURCES = new int [] {
+            R.drawable.list_yellow_middle,
+            R.drawable.list_blue_middle,
+            R.drawable.list_white_middle,
+            R.drawable.list_green_middle,
+            R.drawable.list_red_middle
+        };
+
+        /** 列表最后一项背景资源数组 */
+        private final static int [] BG_LAST_RESOURCES = new int [] {
+            R.drawable.list_yellow_down,
+            R.drawable.list_blue_down,
+            R.drawable.list_white_down,
+            R.drawable.list_green_down,
+            R.drawable.list_red_down,
+        };
+
+        /** 列表单独项背景资源数组 */
+        private final static int [] BG_SINGLE_RESOURCES = new int [] {
+            R.drawable.list_yellow_single,
+            R.drawable.list_blue_single,
+            R.drawable.list_white_single,
+            R.drawable.list_green_single,
+            R.drawable.list_red_single
+        };
+
+        /**
+         * 获取列表第一项背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的第一项背景资源ID
+         */
+        public static int getNoteBgFirstRes(int id) {
+            return BG_FIRST_RESOURCES[id];
+        }
+
+        /**
+         * 获取列表最后一项背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的最后一项背景资源ID
+         */
+        public static int getNoteBgLastRes(int id) {
+            return BG_LAST_RESOURCES[id];
+        }
+
+        /**
+         * 获取列表单独项背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的单独项背景资源ID
+         */
+        public static int getNoteBgSingleRes(int id) {
+            return BG_SINGLE_RESOURCES[id];
+        }
+
+        /**
+         * 获取列表中间项背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的中间项背景资源ID
+         */
+        public static int getNoteBgNormalRes(int id) {
+            return BG_NORMAL_RESOURCES[id];
+        }
+
+        /**
+         * 获取文件夹背景资源ID
+         * 
+         * @return 文件夹背景资源ID
+         */
+        public static int getFolderBgRes() {
+            return R.drawable.list_folder;
+        }
+    }
+
+    /**
+     * 小部件背景资源管理类，提供不同尺寸小部件的背景资源。
+     */
+    public static class WidgetBgResources {
+        /** 2x尺寸小部件背景资源数组 */
+        private final static int [] BG_2X_RESOURCES = new int [] {
+            R.drawable.widget_2x_yellow,
+            R.drawable.widget_2x_blue,
+            R.drawable.widget_2x_white,
+            R.drawable.widget_2x_green,
+            R.drawable.widget_2x_red,
+        };
+
+        /**
+         * 获取2x尺寸小部件背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的2x尺寸小部件背景资源ID
+         */
+        public static int getWidget2xBgResource(int id) {
+            return BG_2X_RESOURCES[id];
+        }
+
+        /** 4x尺寸小部件背景资源数组 */
+        private final static int [] BG_4X_RESOURCES = new int [] {
+            R.drawable.widget_4x_yellow,
+            R.drawable.widget_4x_blue,
+            R.drawable.widget_4x_white,
+            R.drawable.widget_4x_green,
+            R.drawable.widget_4x_red
+        };
+
+        /**
+         * 获取4x尺寸小部件背景资源ID
+         * 
+         * @param id 背景颜色ID
+         * @return 对应的4x尺寸小部件背景资源ID
+         */
+        public static int getWidget4xBgResource(int id) {
+            return BG_4X_RESOURCES[id];
+        }
+    }
+
+    /**
+     * 文本外观资源管理类，提供不同字体大小的文本外观资源。
+     */
+    public static class TextAppearanceResources {
+        /** 文本外观资源数组 */
+        private final static int [] TEXTAPPEARANCE_RESOURCES = new int [] {
+            R.style.TextAppearanceNormal,
+            R.style.TextAppearanceMedium,
+            R.style.TextAppearanceLarge,
+            R.style.TextAppearanceSuper
+        };
+
+        /**
+         * 获取文本外观资源ID
+         * <p>
+         * 如果ID超出资源数组范围，返回默认字体大小的资源ID。
+         * </p>
+         * 
+         * @param id 字体大小ID
+         * @return 对应的文本外观资源ID
+         */
+        public static int getTexAppearanceResource(int id) {
+            /**
+             * HACKME: Fix bug of store the resource id in shared preference.
+             * The id may larger than the length of resources, in this case,
+             * return the {@link ResourceParser#BG_DEFAULT_FONT_SIZE}
+             */
+            if (id >= TEXTAPPEARANCE_RESOURCES.length) {
+                return BG_DEFAULT_FONT_SIZE;
+            }
+            return TEXTAPPEARANCE_RESOURCES[id];
+        }
+
+        /**
+         * 获取文本外观资源数组的大小
+         * 
+         * @return 文本外观资源数组的大小
+         */
+        public static int getResourcesSize() {
+            return TEXTAPPEARANCE_RESOURCES.length;
+        }
+    }
+}

src/main/java/net/micode/notes/ui/AlarmAlertActivity.java

@@ -0,0 +1,255 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.content.DialogInterface.OnDismissListener;
+import android.content.Intent;
+import android.media.AudioManager;
+import android.media.MediaPlayer;
+import android.media.RingtoneManager;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.PowerManager;
+import android.provider.Settings;
+import android.view.Window;
+import android.view.WindowManager;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.DataUtils;
+
+import java.io.IOException;
+
+
+/**
+ * 闹钟提醒活动类
+ * <p>
+ * 该类用于处理笔记的闹钟提醒功能，当设置了提醒的笔记到达指定时间时，
+ * 会显示提醒对话框并播放提醒铃声，用户可以选择关闭提醒或进入笔记编辑界面
+ * </p>
+ */
+public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
+    /**
+     * 触发提醒的笔记ID
+     */
+    private long mNoteId;
+    
+    /**
+     * 笔记内容的摘要，用于在提醒对话框中显示
+     */
+    private String mSnippet;
+    
+    /**
+     * 提醒对话框中显示的摘要最大长度
+     */
+    private static final int SNIPPET_PREW_MAX_LEN = 60;
+    
+    /**
+     * 用于播放提醒铃声的媒体播放器
+     */
+    MediaPlayer mPlayer;
+
+    /**
+     * 活动创建时的初始化方法
+     * <p>
+     * 该方法完成以下初始化工作：
+     * 1. 设置窗口特性，隐藏标题栏
+     * 2. 配置窗口标志，确保在锁屏状态下也能显示
+     * 3. 如果屏幕未开启，则添加额外标志以唤醒屏幕并保持点亮
+     * 4. 从Intent中获取笔记ID和摘要信息
+     * 5. 创建MediaPlayer实例用于播放提醒铃声
+     * 6. 检查笔记是否存在于数据库中
+     * 7. 如果笔记存在，则显示提醒对话框并播放提醒铃声
+     * </p>
+     * @param savedInstanceState 保存的实例状态
+     */
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+
+        final Window win = getWindow();
+        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+
+        if (!isScreenOn()) {
+            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
+                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
+                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
+                    | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
+        }
+
+        Intent intent = getIntent();
+
+        try {
+            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
+            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
+            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
+                    SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
+                    : mSnippet;
+        } catch (IllegalArgumentException e) {
+            e.printStackTrace();
+            return;
+        }
+
+        mPlayer = new MediaPlayer();
+        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
+            showActionDialog();
+            playAlarmSound();
+        } else {
+            finish();
+        }
+    }
+
+    /**
+     * 检查屏幕是否处于开启状态
+     * <p>
+     * 该方法通过PowerManager系统服务获取当前屏幕状态
+     * </p>
+     * @return 如果屏幕处于开启状态则返回true，否则返回false
+     */
+    private boolean isScreenOn() {
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+        return pm.isScreenOn();
+    }
+
+    /**
+     * 播放提醒铃声
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 获取系统默认的闹钟铃声URI
+     * 2. 检查系统的静音模式设置，确定应该使用的音频流类型
+     * 3. 根据静音模式设置选择合适的音频流类型
+     * 4. 设置MediaPlayer的数据源为获取到的铃声URI
+     * 5. 准备MediaPlayer并设置为循环播放模式
+     * 6. 开始播放提醒铃声
+     * 7. 处理可能出现的各种异常
+     * </p>
+     */
+    private void playAlarmSound() {
+        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
+
+        int silentModeStreams = Settings.System.getInt(getContentResolver(),
+                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
+
+        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
+            mPlayer.setAudioStreamType(silentModeStreams);
+        } else {
+            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
+        }
+        try {
+            mPlayer.setDataSource(this, url);
+            mPlayer.prepare();
+            mPlayer.setLooping(true);
+            mPlayer.start();
+        } catch (IllegalArgumentException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (SecurityException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (IllegalStateException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (IOException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 显示提醒对话框
+     * <p>
+     * 该方法创建并显示一个提醒对话框，包含以下内容：
+     * 1. 设置对话框标题为应用名称
+     * 2. 设置对话框消息为笔记的摘要内容
+     * 3. 添加确定按钮，点击后关闭对话框
+     * 4. 如果屏幕处于开启状态，添加进入按钮，点击后进入笔记编辑界面
+     * 5. 设置对话框关闭监听器，用于在对话框关闭时停止提醒铃声并结束活动
+     * </p>
+     */
+    private void showActionDialog() {
+        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
+        dialog.setTitle(R.string.app_name);
+        dialog.setMessage(mSnippet);
+        dialog.setPositiveButton(R.string.notealert_ok, this);
+        if (isScreenOn()) {
+            dialog.setNegativeButton(R.string.notealert_enter, this);
+        }
+        dialog.show().setOnDismissListener(this);
+    }
+
+    /**
+     * 处理提醒对话框中的按钮点击事件
+     * <p>
+     * 该方法实现了OnClickListener接口，根据点击的按钮执行不同的操作：
+     * 1. 如果点击的是负按钮（进入按钮），则创建Intent跳转到NoteEditActivity
+     * 2. 设置Intent的Action为ACTION_VIEW，并将笔记ID作为额外数据传递
+     * 3. 启动NoteEditActivity让用户查看或编辑对应的笔记
+     * 4. 如果点击的是其他按钮（如确定按钮），则不执行任何额外操作
+     * </p>
+     * @param dialog 触发点击事件的对话框
+     * @param which 点击的按钮ID，对应DialogInterface中的按钮常量
+     */
+    public void onClick(DialogInterface dialog, int which) {
+        switch (which) {
+            case DialogInterface.BUTTON_NEGATIVE:
+                Intent intent = new Intent(this, NoteEditActivity.class);
+                intent.setAction(Intent.ACTION_VIEW);
+                intent.putExtra(Intent.EXTRA_UID, mNoteId);
+                startActivity(intent);
+                break;
+            default:
+                break;
+        }
+    }
+
+    /**
+     * 处理提醒对话框关闭事件
+     * <p>
+     * 该方法实现了OnDismissListener接口，当提醒对话框被关闭时（无论点击了哪个按钮或通过其他方式关闭），
+     * 会停止提醒铃声并结束当前活动
+     * </p>
+     * @param dialog 被关闭的对话框
+     */
+    public void onDismiss(DialogInterface dialog) {
+        stopAlarmSound();
+        finish();
+    }
+
+    /**
+     * 停止提醒铃声并释放媒体播放器资源
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 检查媒体播放器是否存在
+     * 2. 如果存在，则停止播放铃声
+     * 3. 释放媒体播放器占用的资源
+     * 4. 将媒体播放器引用置为null，防止内存泄漏
+     * </p>
+     */
+    private void stopAlarmSound() {
+        if (mPlayer != null) {
+            mPlayer.stop();
+            mPlayer.release();
+            mPlayer = null;
+        }
+    }
+}

src/main/java/net/micode/notes/ui/AlarmInitReceiver.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.ContentUris;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+
+
+/**
+ * 闹钟初始化广播接收器
+ * <p>
+ * 该广播接收器负责在系统启动时重新注册所有未触发的笔记闹钟。
+ * 当系统重启后，之前设置的闹钟会丢失，需要通过该接收器重新初始化
+ * </p>
+ */
+public class AlarmInitReceiver extends BroadcastReceiver {
+    /**
+     * 闹钟数据查询的投影列数组
+     * <p>
+     * 定义了从数据库查询笔记闹钟数据时需要获取的列，包括笔记ID和闹钟触发日期
+     * </p>
+     */
+    private static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.ALERTED_DATE
+    };
+
+    /**
+     * 查询结果中笔记ID列的索引
+     */
+    private static final int COLUMN_ID                = 0;
+    
+    /**
+     * 查询结果中闹钟触发日期列的索引
+     */
+    private static final int COLUMN_ALERTED_DATE      = 1;
+
+    /**
+     * 接收广播时调用的方法
+     * <p>
+     * 当系统发送广播时（通常是系统启动完成），该方法会查询所有设置了未来闹钟的笔记，
+     * 并使用AlarmManager重新注册这些闹钟
+     * </p>
+     * @param context 上下文对象
+     * @param intent 接收到的广播意图
+     */
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        long currentDate = System.currentTimeMillis();
+        Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                PROJECTION,
+                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
+                new String[] { String.valueOf(currentDate) },
+                null);
+
+        if (c != null) {
+            if (c.moveToFirst()) {
+                do {
+                    long alertDate = c.getLong(COLUMN_ALERTED_DATE);
+                    Intent sender = new Intent(context, AlarmReceiver.class);
+                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
+                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
+                    AlarmManager alermManager = (AlarmManager)
+                            context.getSystemService(Context.ALARM_SERVICE);
+                    alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
+                } while (c.moveToNext());
+            }
+            c.close();
+        }
+    }
+}

src/main/java/net/micode/notes/ui/AlarmReceiver.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+/**
+ * 闹钟触发广播接收器
+ * <p>
+ * 该广播接收器负责处理闹钟触发事件，当闹钟时间到达时，它会启动闹钟提醒活动
+ * </p>
+ */
+public class AlarmReceiver extends BroadcastReceiver {
+    /**
+     * 接收闹钟触发广播时调用的方法
+     * <p>
+     * 当闹钟时间到达时，该方法会启动AlarmAlertActivity来显示闹钟提醒
+     * </p>
+     * @param context 上下文对象
+     * @param intent 接收到的广播意图，包含闹钟相关的笔记信息
+     */
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        intent.setClass(context, AlarmAlertActivity.class);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        context.startActivity(intent);
+    }
+}

src/main/java/net/micode/notes/ui/DateTimePicker.java

@@ -0,0 +1,646 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import java.text.DateFormatSymbols;
+import java.util.Calendar;
+
+import net.micode.notes.R;
+
+
+import android.content.Context;
+import android.text.format.DateFormat;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.NumberPicker;
+
+/**
+ * 日期时间选择组件
+ * <p>
+ * 该类是一个自定义的日期时间选择组件，继承自FrameLayout，用于在小米便签应用中
+ * 提供直观的日期时间选择界面。它支持12/24小时制切换，并通过NumberPicker组件
+ * 实现日期、小时、分钟和AM/PM的选择
+ * </p>
+ */
+public class DateTimePicker extends FrameLayout {
+
+    /**
+     * 默认启用状态
+     */
+    private static final boolean DEFAULT_ENABLE_STATE = true;
+
+    /**
+     * 半天的小时数（12小时）
+     */
+    private static final int HOURS_IN_HALF_DAY = 12;
+    
+    /**
+     * 全天的小时数（24小时）
+     */
+    private static final int HOURS_IN_ALL_DAY = 24;
+    
+    /**
+     * 一周的天数（7天）
+     */
+    private static final int DAYS_IN_ALL_WEEK = 7;
+    
+    /**
+     * 日期选择器的最小值
+     */
+    private static final int DATE_SPINNER_MIN_VAL = 0;
+    
+    /**
+     * 日期选择器的最大值
+     */
+    private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;
+    
+    /**
+     * 24小时制下小时选择器的最小值
+     */
+    private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;
+    
+    /**
+     * 24小时制下小时选择器的最大值
+     */
+    private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23;
+    
+    /**
+     * 12小时制下小时选择器的最小值
+     */
+    private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;
+    
+    /**
+     * 12小时制下小时选择器的最大值
+     */
+    private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12;
+    
+    /**
+     * 分钟选择器的最小值
+     */
+    private static final int MINUT_SPINNER_MIN_VAL = 0;
+    
+    /**
+     * 分钟选择器的最大值
+     */
+    private static final int MINUT_SPINNER_MAX_VAL = 59;
+    
+    /**
+     * AM/PM选择器的最小值
+     */
+    private static final int AMPM_SPINNER_MIN_VAL = 0;
+    
+    /**
+     * AM/PM选择器的最大值
+     */
+    private static final int AMPM_SPINNER_MAX_VAL = 1;
+
+    /**
+     * 日期选择器组件
+     */
+    private final NumberPicker mDateSpinner;
+    
+    /**
+     * 小时选择器组件
+     */
+    private final NumberPicker mHourSpinner;
+    
+    /**
+     * 分钟选择器组件
+     */
+    private final NumberPicker mMinuteSpinner;
+    
+    /**
+     * AM/PM选择器组件
+     */
+    private final NumberPicker mAmPmSpinner;
+    
+    /**
+     * 当前选择的日期和时间
+     */
+    private Calendar mDate;
+
+    /**
+     * 日期选择器显示的日期值数组
+     */
+    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
+
+    /**
+     * 是否为上午
+     */
+    private boolean mIsAm;
+
+    /**
+     * 是否为24小时制视图
+     */
+    private boolean mIs24HourView;
+
+    /**
+     * 组件是否启用
+     */
+    private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
+
+    /**
+     * 是否正在初始化
+     */
+    private boolean mInitialising;
+
+    /**
+     * 日期时间变化监听器
+     */
+    private OnDateTimeChangedListener mOnDateTimeChangedListener;
+
+    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
+            updateDateControl();
+            onDateTimeChanged();
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            boolean isDateChanged = false;
+            Calendar cal = Calendar.getInstance();
+            if (!mIs24HourView) {
+                if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1);
+                    isDateChanged = true;
+                } else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1);
+                    isDateChanged = true;
+                }
+                if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
+                        oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    mIsAm = !mIsAm;
+                    updateAmPmControl();
+                }
+            } else {
+                if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1);
+                    isDateChanged = true;
+                } else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1);
+                    isDateChanged = true;
+                }
+            }
+            int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
+            mDate.set(Calendar.HOUR_OF_DAY, newHour);
+            onDateTimeChanged();
+            if (isDateChanged) {
+                setCurrentYear(cal.get(Calendar.YEAR));
+                setCurrentMonth(cal.get(Calendar.MONTH));
+                setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
+            }
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            int minValue = mMinuteSpinner.getMinValue();
+            int maxValue = mMinuteSpinner.getMaxValue();
+            int offset = 0;
+            if (oldVal == maxValue && newVal == minValue) {
+                offset += 1;
+            } else if (oldVal == minValue && newVal == maxValue) {
+                offset -= 1;
+            }
+            if (offset != 0) {
+                mDate.add(Calendar.HOUR_OF_DAY, offset);
+                mHourSpinner.setValue(getCurrentHour());
+                updateDateControl();
+                int newHour = getCurrentHourOfDay();
+                if (newHour >= HOURS_IN_HALF_DAY) {
+                    mIsAm = false;
+                    updateAmPmControl();
+                } else {
+                    mIsAm = true;
+                    updateAmPmControl();
+                }
+            }
+            mDate.set(Calendar.MINUTE, newVal);
+            onDateTimeChanged();
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mIsAm = !mIsAm;
+            if (mIsAm) {
+                mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
+            } else {
+                mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
+            }
+            updateAmPmControl();
+            onDateTimeChanged();
+        }
+    };
+
+    /**
+     * 日期时间变化监听器接口
+     * <p>
+     * 当日期时间选择器的值发生变化时，会通过此接口通知外部
+     * </p>
+     */
+    public interface OnDateTimeChangedListener {
+        /**
+         * 日期时间变化时调用的方法
+         * @param view 日期时间选择器实例
+         * @param year 选择的年份
+         * @param month 选择的月份（0-11）
+         * @param dayOfMonth 选择的日（1-31）
+         * @param hourOfDay 选择的小时（0-23）
+         * @param minute 选择的分钟（0-59）
+         */
+        void onDateTimeChanged(DateTimePicker view, int year, int month,
+                int dayOfMonth, int hourOfDay, int minute);
+    }
+
+    /**
+     * 构造函数，使用当前时间初始化日期时间选择器
+     * @param context 上下文对象
+     */
+    public DateTimePicker(Context context) {
+        this(context, System.currentTimeMillis());
+    }
+
+    /**
+     * 构造函数，使用指定时间初始化日期时间选择器，根据系统设置决定是否使用24小时制
+     * @param context 上下文对象
+     * @param date 初始日期时间，以毫秒为单位
+     */
+    public DateTimePicker(Context context, long date) {
+        this(context, date, DateFormat.is24HourFormat(context));
+    }
+
+    /**
+     * 构造函数，使用指定时间和时间格式初始化日期时间选择器
+     * @param context 上下文对象
+     * @param date 初始日期时间，以毫秒为单位
+     * @param is24HourView 是否使用24小时制
+     */
+    public DateTimePicker(Context context, long date, boolean is24HourView) {
+        super(context);
+        mDate = Calendar.getInstance();
+        mInitialising = true;
+        mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
+        inflate(context, R.layout.datetime_picker, this);
+
+        mDateSpinner = (NumberPicker) findViewById(R.id.date);
+        mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
+        mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
+        mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
+
+        mHourSpinner = (NumberPicker) findViewById(R.id.hour);
+        mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
+        mMinuteSpinner =  (NumberPicker) findViewById(R.id.minute);
+        mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
+        mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
+        mMinuteSpinner.setOnLongPressUpdateInterval(100);
+        mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
+
+        String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings();
+        mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
+        mAmPmSpinner.setMinValue(AMPM_SPINNER_MIN_VAL);
+        mAmPmSpinner.setMaxValue(AMPM_SPINNER_MAX_VAL);
+        mAmPmSpinner.setDisplayedValues(stringsForAmPm);
+        mAmPmSpinner.setOnValueChangedListener(mOnAmPmChangedListener);
+
+        // update controls to initial state
+        updateDateControl();
+        updateHourControl();
+        updateAmPmControl();
+
+        set24HourView(is24HourView);
+
+        // set to current time
+        setCurrentDate(date);
+
+        setEnabled(isEnabled());
+
+        // set the content descriptions
+        mInitialising = false;
+    }
+
+    @Override
+    public void setEnabled(boolean enabled) {
+        if (mIsEnabled == enabled) {
+            return;
+        }
+        super.setEnabled(enabled);
+        mDateSpinner.setEnabled(enabled);
+        mMinuteSpinner.setEnabled(enabled);
+        mHourSpinner.setEnabled(enabled);
+        mAmPmSpinner.setEnabled(enabled);
+        mIsEnabled = enabled;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return mIsEnabled;
+    }
+
+    /**
+     * Get the current date in millis
+     *
+     * @return the current date in millis
+     */
+    public long getCurrentDateInTimeMillis() {
+        return mDate.getTimeInMillis();
+    }
+
+    /**
+     * Set the current date
+     *
+     * @param date The current date in millis
+     */
+    public void setCurrentDate(long date) {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(date);
+        setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
+                cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
+    }
+
+    /**
+     * Set the current date
+     *
+     * @param year The current year
+     * @param month The current month
+     * @param dayOfMonth The current dayOfMonth
+     * @param hourOfDay The current hourOfDay
+     * @param minute The current minute
+     */
+    public void setCurrentDate(int year, int month,
+            int dayOfMonth, int hourOfDay, int minute) {
+        setCurrentYear(year);
+        setCurrentMonth(month);
+        setCurrentDay(dayOfMonth);
+        setCurrentHour(hourOfDay);
+        setCurrentMinute(minute);
+    }
+
+    /**
+     * Get current year
+     *
+     * @return The current year
+     */
+    public int getCurrentYear() {
+        return mDate.get(Calendar.YEAR);
+    }
+
+    /**
+     * Set current year
+     *
+     * @param year The current year
+     */
+    public void setCurrentYear(int year) {
+        if (!mInitialising && year == getCurrentYear()) {
+            return;
+        }
+        mDate.set(Calendar.YEAR, year);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current month in the year
+     *
+     * @return The current month in the year
+     */
+    public int getCurrentMonth() {
+        return mDate.get(Calendar.MONTH);
+    }
+
+    /**
+     * Set current month in the year
+     *
+     * @param month The month in the year
+     */
+    public void setCurrentMonth(int month) {
+        if (!mInitialising && month == getCurrentMonth()) {
+            return;
+        }
+        mDate.set(Calendar.MONTH, month);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current day of the month
+     *
+     * @return The day of the month
+     */
+    public int getCurrentDay() {
+        return mDate.get(Calendar.DAY_OF_MONTH);
+    }
+
+    /**
+     * Set current day of the month
+     *
+     * @param dayOfMonth The day of the month
+     */
+    public void setCurrentDay(int dayOfMonth) {
+        if (!mInitialising && dayOfMonth == getCurrentDay()) {
+            return;
+        }
+        mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current hour in 24 hour mode, in the range (0~23)
+     * @return The current hour in 24 hour mode
+     */
+    public int getCurrentHourOfDay() {
+        return mDate.get(Calendar.HOUR_OF_DAY);
+    }
+
+    /**
+     * 获取当前小时
+     * <p>
+     * 根据当前视图模式返回正确的小时值：
+     * - 24小时制：直接返回当前小时（0-23）
+     * - 12小时制：返回1-12之间的小时值
+     * </p>
+     * @return 当前小时值
+     */
+    private int getCurrentHour() {
+        if (mIs24HourView){
+            return getCurrentHourOfDay();
+        } else {
+            int hour = getCurrentHourOfDay();
+            if (hour > HOURS_IN_HALF_DAY) {
+                return hour - HOURS_IN_HALF_DAY;
+            } else {
+                return hour == 0 ? HOURS_IN_HALF_DAY : hour;
+            }
+        }
+    }
+
+    /**
+     * 设置当前小时（24小时制，范围0-23）
+     * @param hourOfDay 当前小时值（24小时制）
+     */
+    public void setCurrentHour(int hourOfDay) {
+        if (!mInitialising && hourOfDay == getCurrentHourOfDay()) {
+            return;
+        }
+        mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
+        if (!mIs24HourView) {
+            if (hourOfDay >= HOURS_IN_HALF_DAY) {
+                mIsAm = false;
+                if (hourOfDay > HOURS_IN_HALF_DAY) {
+                    hourOfDay -= HOURS_IN_HALF_DAY;
+                }
+            } else {
+                mIsAm = true;
+                if (hourOfDay == 0) {
+                    hourOfDay = HOURS_IN_HALF_DAY;
+                }
+            }
+            updateAmPmControl();
+        }
+        mHourSpinner.setValue(hourOfDay);
+        onDateTimeChanged();
+    }
+
+    /**
+     * 获取当前分钟
+     * @return 当前分钟值（0-59）
+     */
+    public int getCurrentMinute() {
+        return mDate.get(Calendar.MINUTE);
+    }
+
+    /**
+     * 设置当前分钟
+     * @param minute 当前分钟值（0-59）
+     */
+    public void setCurrentMinute(int minute) {
+        if (!mInitialising && minute == getCurrentMinute()) {
+            return;
+        }
+        mMinuteSpinner.setValue(minute);
+        mDate.set(Calendar.MINUTE, minute);
+        onDateTimeChanged();
+    }
+
+    /**
+     * 获取当前是否为24小时制视图
+     * @return true表示为24小时制视图，false表示为12小时制视图
+     */
+    public boolean is24HourView () {
+        return mIs24HourView;
+    }
+
+    /**
+     * 设置是否使用24小时制或AM/PM模式
+     * @param is24HourView true表示使用24小时制，false表示使用AM/PM模式
+     */
+    public void set24HourView(boolean is24HourView) {
+        if (mIs24HourView == is24HourView) {
+            return;
+        }
+        mIs24HourView = is24HourView;
+        mAmPmSpinner.setVisibility(is24HourView ? View.GONE : View.VISIBLE);
+        int hour = getCurrentHourOfDay();
+        updateHourControl();
+        setCurrentHour(hour);
+        updateAmPmControl();
+    }
+
+    /**
+     * 更新日期控件
+     * <p>
+     * 该方法负责更新日期选择器的显示值，显示当前日期前后几天的日期
+     * </p>
+     */
+    private void updateDateControl() {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(mDate.getTimeInMillis());
+        cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1);
+        mDateSpinner.setDisplayedValues(null);
+        for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) {
+            cal.add(Calendar.DAY_OF_YEAR, 1);
+            mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal);
+        }
+        mDateSpinner.setDisplayedValues(mDateDisplayValues);
+        mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
+        mDateSpinner.invalidate();
+    }
+
+    /**
+     * 更新AM/PM控件
+     * <p>
+     * 该方法负责根据当前时间和视图模式更新AM/PM选择器的显示
+     * </p>
+     */
+    private void updateAmPmControl() {
+        if (mIs24HourView) {
+            mAmPmSpinner.setVisibility(View.GONE);
+        } else {
+            int index = mIsAm ? Calendar.AM : Calendar.PM;
+            mAmPmSpinner.setValue(index);
+            mAmPmSpinner.setVisibility(View.VISIBLE);
+        }
+    }
+
+    /**
+     * 更新小时控件
+     * <p>
+     * 该方法负责根据当前视图模式更新小时选择器的最小值和最大值
+     * </p>
+     */
+    private void updateHourControl() {
+        if (mIs24HourView) {
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW);
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW);
+        } else {
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW);
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW);
+        }
+    }
+
+    /**
+     * 设置日期时间变化监听器
+     * @param callback 日期时间变化时的回调函数，若为null则不执行任何操作
+     */
+    public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
+        mOnDateTimeChangedListener = callback;
+    }
+
+    /**
+     * 日期时间变化时调用的方法
+     * <p>
+     * 当日期或时间发生变化时，该方法会通知注册的监听器
+     * </p>
+     */
+    private void onDateTimeChanged() {
+        if (mOnDateTimeChangedListener != null) {
+            mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
+                    getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
+        }
+    }
+}

src/main/java/net/micode/notes/ui/DateTimePickerDialog.java

@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import java.util.Calendar;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.DateTimePicker;
+import net.micode.notes.ui.DateTimePicker.OnDateTimeChangedListener;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.text.format.DateFormat;
+import android.text.format.DateUtils;
+
+/**
+ * 日期时间选择对话框
+ * <p>
+ * 该类是一个封装了DateTimePicker组件的对话框，用于在小米便签应用中
+ * 提供一个完整的日期时间选择界面。用户可以通过该对话框选择日期和时间，
+ * 并在确认后将选择结果返回给调用者
+ * </p>
+ */
+public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
+
+    /**
+     * 当前选择的日期和时间
+     */
+    private Calendar mDate = Calendar.getInstance();
+    
+    /**
+     * 是否使用24小时制视图
+     */
+    private boolean mIs24HourView;
+    
+    /**
+     * 日期时间设置监听器，用于通知外部选择结果
+     */
+    private OnDateTimeSetListener mOnDateTimeSetListener;
+    
+    /**
+     * 日期时间选择器组件
+     */
+    private DateTimePicker mDateTimePicker;
+    /**
+     * 日期时间设置监听器接口
+     * <p>
+     * 当用户在对话框中确认选择日期时间后，会通过此接口通知外部
+     * </p>
+     */
+    public interface OnDateTimeSetListener {
+        /**
+         * 日期时间设置完成时调用的方法
+         * @param dialog 对话框实例
+         * @param date 选择的日期时间，以毫秒为单位
+         */
+        void OnDateTimeSet(AlertDialog dialog, long date);
+    }
+
+    /**
+     * 构造函数，使用指定日期初始化日期时间选择对话框
+     * @param context 上下文对象
+     * @param date 初始日期时间，以毫秒为单位
+     */
+    public DateTimePickerDialog(Context context, long date) {
+        super(context);
+        mDateTimePicker = new DateTimePicker(context);
+        setView(mDateTimePicker);
+        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
+            public void onDateTimeChanged(DateTimePicker view, int year, int month,
+                    int dayOfMonth, int hourOfDay, int minute) {
+                mDate.set(Calendar.YEAR, year);
+                mDate.set(Calendar.MONTH, month);
+                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
+                mDate.set(Calendar.MINUTE, minute);
+                updateTitle(mDate.getTimeInMillis());
+            }
+        });
+        mDate.setTimeInMillis(date);
+        mDate.set(Calendar.SECOND, 0);
+        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis());
+        setButton(context.getString(R.string.datetime_dialog_ok), this);
+        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null);
+        set24HourView(DateFormat.is24HourFormat(this.getContext()));
+        updateTitle(mDate.getTimeInMillis());
+    }
+
+    /**
+     * 设置是否使用24小时制视图
+     * @param is24HourView true表示使用24小时制，false表示使用12小时制
+     */
+    public void set24HourView(boolean is24HourView) {
+        mIs24HourView = is24HourView;
+    }
+
+    /**
+     * 设置日期时间设置监听器
+     * @param callBack 日期时间设置完成时的回调函数
+     */
+    public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
+        mOnDateTimeSetListener = callBack;
+    }
+
+    /**
+     * 更新对话框标题
+     * <p>
+     * 该方法根据当前选择的日期时间和视图模式更新对话框标题
+     * </p>
+     * @param date 当前选择的日期时间，以毫秒为单位
+     */
+    private void updateTitle(long date) {
+        int flag =
+            DateUtils.FORMAT_SHOW_YEAR |
+            DateUtils.FORMAT_SHOW_DATE |
+            DateUtils.FORMAT_SHOW_TIME;
+        flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR;
+        setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
+    }
+
+    /**
+     * 点击对话框按钮时调用的方法
+     * <p>
+     * 当用户点击对话框的确定按钮时，会调用该方法，通知注册的监听器
+     * </p>
+     * @param arg0 对话框实例
+     * @param arg1 点击的按钮ID
+     */
+    @Override
+    public void onClick(DialogInterface arg0, int arg1) {
+        if (mOnDateTimeSetListener != null) {
+            mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
+        }
+    }
+
+}

src/main/java/net/micode/notes/ui/DropdownMenu.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.PopupMenu;
+import android.widget.PopupMenu.OnMenuItemClickListener;
+
+import net.micode.notes.R;
+
+/**
+ * 下拉菜单封装类
+ * <p>
+ * 该类封装了Android的PopupMenu，提供了一个简单的接口来创建和管理下拉菜单
+ * </p>
+ */
+public class DropdownMenu {
+    /**
+     * 触发下拉菜单的按钮
+     */
+    private Button mButton;
+    
+    /**
+     * 下拉菜单实例
+     */
+    private PopupMenu mPopupMenu;
+    
+    /**
+     * 菜单对象
+     */
+    private Menu mMenu;
+
+    /**
+     * 构造函数，创建一个下拉菜单
+     * @param context 上下文对象
+     * @param button 触发下拉菜单的按钮
+     * @param menuId 菜单资源ID
+     */
+    public DropdownMenu(Context context, Button button, int menuId) {
+        mButton = button;
+        mButton.setBackgroundResource(R.drawable.dropdown_icon);
+        mPopupMenu = new PopupMenu(context, mButton);
+        mMenu = mPopupMenu.getMenu();
+        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
+        mButton.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                mPopupMenu.show();
+            }
+        });
+    }
+
+    /**
+     * 设置下拉菜单项点击监听器
+     * @param listener 菜单项点击监听器
+     */
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) {
+            mPopupMenu.setOnMenuItemClickListener(listener);
+        }
+    }
+
+    /**
+     * 查找指定ID的菜单项
+     * @param id 菜单项ID
+     * @return 指定ID的菜单项，若不存在则返回null
+     */
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id);
+    }
+
+    /**
+     * 设置下拉菜单按钮的标题
+     * @param title 按钮标题
+     */
+    public void setTitle(CharSequence title) {
+        mButton.setText(title);
+    }
+}

src/main/java/net/micode/notes/ui/FoldersListAdapter.java

@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CursorAdapter;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+
+
+/**
+ * 文件夹列表适配器
+ * <p>
+ * 该类继承自CursorAdapter，用于在小米便签应用中显示文件夹列表
+ * </p>
+ */
+public class FoldersListAdapter extends CursorAdapter {
+    /**
+     * 文件夹数据查询的投影列数组
+     * <p>
+     * 定义了从数据库查询文件夹数据时需要获取的列，包括文件夹ID和名称
+     * </p>
+     */
+    public static final String [] PROJECTION = {
+        NoteColumns.ID,
+        NoteColumns.SNIPPET
+    };
+
+    /**
+     * 查询结果中文件夹ID列的索引
+     */
+    public static final int ID_COLUMN   = 0;
+    
+    /**
+     * 查询结果中文件夹名称列的索引
+     */
+    public static final int NAME_COLUMN = 1;
+
+    /**
+     * 构造函数，创建文件夹列表适配器
+     * @param context 上下文对象
+     * @param c 包含文件夹数据的游标
+     */
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c);
+        // TODO Auto-generated constructor stub
+    }
+
+    /**
+     * 创建新的列表项视图
+     * @param context 上下文对象
+     * @param cursor 包含文件夹数据的游标
+     * @param parent 父视图组
+     * @return 新创建的列表项视图
+     */
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new FolderListItem(context);
+    }
+
+    /**
+     * 将数据绑定到列表项视图
+     * @param view 列表项视图
+     * @param context 上下文对象
+     * @param cursor 包含文件夹数据的游标
+     */
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof FolderListItem) {
+            String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                    .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+            ((FolderListItem) view).bind(folderName);
+        }
+    }
+
+    /**
+     * 获取指定位置的文件夹名称
+     * @param context 上下文对象
+     * @param position 列表项位置
+     * @return 文件夹名称
+     */
+    public String getFolderName(Context context, int position) {
+        Cursor cursor = (Cursor) getItem(position);
+        return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+    }
+
+    /**
+     * 文件夹列表项视图
+     * <p>
+     * 该内部类用于显示单个文件夹列表项
+     * </p>
+     */
+    private class FolderListItem extends LinearLayout {
+        /**
+         * 文件夹名称文本视图
+         */
+        private TextView mName;
+
+        /**
+         * 构造函数，创建文件夹列表项视图
+         * @param context 上下文对象
+         */
+        public FolderListItem(Context context) {
+            super(context);
+            inflate(context, R.layout.folder_list_item, this);
+            mName = (TextView) findViewById(R.id.tv_folder_name);
+        }
+
+        /**
+         * 绑定文件夹名称到视图
+         * @param name 文件夹名称
+         */
+        public void bind(String name) {
+            mName.setText(name);
+        }
+    }
+
+}

src/main/java/net/micode/notes/ui/NoteEditText.java

@@ -0,0 +1,319 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.text.Layout;
+import android.text.Selection;
+import android.text.Spanned;
+import android.text.TextUtils;
+import android.text.style.URLSpan;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.ContextMenu;
+import android.view.KeyEvent;
+import android.view.MenuItem;
+import android.view.MenuItem.OnMenuItemClickListener;
+import android.view.MotionEvent;
+import android.widget.EditText;
+
+import net.micode.notes.R;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * 自定义笔记编辑文本框
+ * <p>
+ * 该类继承自EditText，用于小米便签应用中的笔记编辑，支持链接识别、键盘事件处理
+ * 和文本视图变化监听等功能
+ * </p>
+ */
+public class NoteEditText extends EditText {
+    /**
+     * 日志标签
+     */
+    private static final String TAG = "NoteEditText";
+    
+    /**
+     * 当前编辑框的索引
+     */
+    private int mIndex;
+    
+    /**
+     * 删除操作前的选择起始位置
+     */
+    private int mSelectionStartBeforeDelete;
+
+    /**
+     * 电话链接协议
+     */
+    private static final String SCHEME_TEL = "tel:" ;
+    
+    /**
+     * HTTP链接协议
+     */
+    private static final String SCHEME_HTTP = "http:" ;
+    
+    /**
+     * 邮件链接协议
+     */
+    private static final String SCHEME_EMAIL = "mailto:" ;
+
+    /**
+     * 链接协议与资源ID的映射表
+     */
+    private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
+    static {
+        sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel);
+        sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web);
+        sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email);
+    }
+
+    /**
+     * 文本视图变化监听器接口
+     * <p>
+     * 由{@link NoteEditActivity}调用，用于处理编辑框的删除或添加
+     * </p>
+     */
+    public interface OnTextViewChangeListener {
+        /**
+         * 当按下{@link KeyEvent#KEYCODE_DEL}且文本为空时，删除当前编辑框
+         */
+        void onEditTextDelete(int index, String text);
+
+        /**
+         * 当按下{@link KeyEvent#KEYCODE_ENTER}时，在当前编辑框后添加新的编辑框
+         */
+        void onEditTextEnter(int index, String text);
+
+        /**
+         * 当文本变化时，隐藏或显示项目选项
+         */
+        void onTextChange(int index, boolean hasText);
+    }
+
+    /**
+     * 文本视图变化监听器实例
+     */
+    private OnTextViewChangeListener mOnTextViewChangeListener;
+
+    /**
+     * 构造函数，创建笔记编辑文本框
+     * @param context 上下文对象
+     */
+    public NoteEditText(Context context) {
+        super(context, null);
+        mIndex = 0;
+    }
+
+    /**
+     * 设置编辑框索引
+     * @param index 编辑框索引
+     */
+    public void setIndex(int index) {
+        mIndex = index;
+    }
+
+    /**
+     * 设置文本视图变化监听器
+     * @param listener 文本视图变化监听器
+     */
+    public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
+        mOnTextViewChangeListener = listener;
+    }
+
+    /**
+     * 构造函数，创建笔记编辑文本框
+     * @param context 上下文对象
+     * @param attrs 属性集合
+     */
+    public NoteEditText(Context context, AttributeSet attrs) {
+        super(context, attrs, android.R.attr.editTextStyle);
+    }
+
+    /**
+     * 构造函数，创建笔记编辑文本框
+     * @param context 上下文对象
+     * @param attrs 属性集合
+     * @param defStyle 默认样式
+     */
+    public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        // TODO Auto-generated constructor stub
+    }
+
+    /**
+     * 处理触摸事件
+     * <p>
+     * 当用户点击编辑框时，将光标定位到点击位置
+     * </p>
+     * @param event 触摸事件
+     * @return 事件是否被处理
+     */
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+
+                int x = (int) event.getX();
+                int y = (int) event.getY();
+                x -= getTotalPaddingLeft();
+                y -= getTotalPaddingTop();
+                x += getScrollX();
+                y += getScrollY();
+
+                Layout layout = getLayout();
+                int line = layout.getLineForVertical(y);
+                int off = layout.getOffsetForHorizontal(line, x);
+                Selection.setSelection(getText(), off);
+                break;
+        }
+
+        return super.onTouchEvent(event);
+    }
+
+    /**
+     * 处理按键按下事件
+     * <p>
+     * 监听回车键和删除键的按下事件
+     * </p>
+     * @param keyCode 按键代码
+     * @param event 按键事件
+     * @return 事件是否被处理
+     */
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    return false;
+                }
+                break;
+            case KeyEvent.KEYCODE_DEL:
+                mSelectionStartBeforeDelete = getSelectionStart();
+                break;
+            default:
+                break;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+
+    /**
+     * 处理按键释放事件
+     * <p>
+     * 监听删除键和回车键的释放事件，实现编辑框的删除和添加功能
+     * </p>
+     * @param keyCode 按键代码
+     * @param event 按键事件
+     * @return 事件是否被处理
+     */
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        switch(keyCode) {
+            case KeyEvent.KEYCODE_DEL:
+                if (mOnTextViewChangeListener != null) {
+                    if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
+                        mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
+                        return true;
+                    }
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted");
+                }
+                break;
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    int selectionStart = getSelectionStart();
+                    String text = getText().subSequence(selectionStart, length()).toString();
+                    setText(getText().subSequence(0, selectionStart));
+                    mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text);
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted");
+                }
+                break;
+            default:
+                break;
+        }
+        return super.onKeyUp(keyCode, event);
+    }
+
+    /**
+     * 处理焦点变化事件
+     * <p>
+     * 当编辑框失去焦点且文本为空时，通知监听器隐藏项目选项
+     * 当编辑框获得焦点或文本不为空时，通知监听器显示项目选项
+     * </p>
+     * @param focused 是否获得焦点
+     * @param direction 焦点变化方向
+     * @param previouslyFocusedRect 之前焦点所在的矩形区域
+     */
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        if (mOnTextViewChangeListener != null) {
+            if (!focused && TextUtils.isEmpty(getText())) {
+                mOnTextViewChangeListener.onTextChange(mIndex, false);
+            } else {
+                mOnTextViewChangeListener.onTextChange(mIndex, true);
+            }
+        }
+        super.onFocusChanged(focused, direction, previouslyFocusedRect);
+    }
+
+    /**
+     * 创建上下文菜单
+     * <p>
+     * 当选中的文本包含链接时，创建相应的链接操作菜单
+     * </p>
+     * @param menu 上下文菜单
+     */
+    @Override
+    protected void onCreateContextMenu(ContextMenu menu) {
+        if (getText() instanceof Spanned) {
+            int selStart = getSelectionStart();
+            int selEnd = getSelectionEnd();
+
+            int min = Math.min(selStart, selEnd);
+            int max = Math.max(selStart, selEnd);
+
+            final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
+            if (urls.length == 1) {
+                int defaultResId = 0;
+                for(String schema: sSchemaActionResMap.keySet()) {
+                    if(urls[0].getURL().indexOf(schema) >= 0) {
+                        defaultResId = sSchemaActionResMap.get(schema);
+                        break;
+                    }
+                }
+
+                if (defaultResId == 0) {
+                    defaultResId = R.string.note_link_other;
+                }
+
+                menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
+                        new OnMenuItemClickListener() {
+                            public boolean onMenuItemClick(MenuItem item) {
+                                // goto a new intent
+                                urls[0].onClick(NoteEditText.this);
+                                return true;
+                            }
+                        });
+            }
+        }
+        super.onCreateContextMenu(menu);
+    }
+}

src/main/java/net/micode/notes/ui/NoteItemData.java

@@ -0,0 +1,459 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.text.TextUtils;
+
+import net.micode.notes.data.Contact;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.tool.DataUtils;
+
+
+/**
+ * 笔记列表项数据类
+ * <p>
+ * 该类用于存储和管理小米便签应用中笔记列表项的数据，包括笔记的基本信息、
+ * 文件夹信息、提醒信息等
+ * </p>
+ */
+public class NoteItemData {
+    /**
+     * 笔记数据查询的投影列数组
+     * <p>
+     * 定义了从数据库查询笔记数据时需要获取的列
+     * </p>
+     */
+    static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.ALERTED_DATE,
+        NoteColumns.BG_COLOR_ID,
+        NoteColumns.CREATED_DATE,
+        NoteColumns.HAS_ATTACHMENT,
+        NoteColumns.MODIFIED_DATE,
+        NoteColumns.NOTES_COUNT,
+        NoteColumns.PARENT_ID,
+        NoteColumns.SNIPPET,
+        NoteColumns.TYPE,
+        NoteColumns.WIDGET_ID,
+        NoteColumns.WIDGET_TYPE,
+    };
+
+    /**
+     * 查询结果中笔记ID列的索引
+     */
+    private static final int ID_COLUMN                    = 0;
+    
+    /**
+     * 查询结果中提醒日期列的索引
+     */
+    private static final int ALERTED_DATE_COLUMN          = 1;
+    
+    /**
+     * 查询结果中背景颜色ID列的索引
+     */
+    private static final int BG_COLOR_ID_COLUMN           = 2;
+    
+    /**
+     * 查询结果中创建日期列的索引
+     */
+    private static final int CREATED_DATE_COLUMN          = 3;
+    
+    /**
+     * 查询结果中是否有附件列的索引
+     */
+    private static final int HAS_ATTACHMENT_COLUMN        = 4;
+    
+    /**
+     * 查询结果中修改日期列的索引
+     */
+    private static final int MODIFIED_DATE_COLUMN         = 5;
+    
+    /**
+     * 查询结果中笔记数量列的索引
+     */
+    private static final int NOTES_COUNT_COLUMN           = 6;
+    
+    /**
+     * 查询结果中父文件夹ID列的索引
+     */
+    private static final int PARENT_ID_COLUMN             = 7;
+    
+    /**
+     * 查询结果中笔记摘要列的索引
+     */
+    private static final int SNIPPET_COLUMN               = 8;
+    
+    /**
+     * 查询结果中笔记类型列的索引
+     */
+    private static final int TYPE_COLUMN                  = 9;
+    
+    /**
+     * 查询结果中小组件ID列的索引
+     */
+    private static final int WIDGET_ID_COLUMN             = 10;
+    
+    /**
+     * 查询结果中小组件类型列的索引
+     */
+    private static final int WIDGET_TYPE_COLUMN           = 11;
+
+    /**
+     * 笔记ID
+     */
+    private long mId;
+    
+    /**
+     * 提醒日期
+     */
+    private long mAlertDate;
+    
+    /**
+     * 背景颜色ID
+     */
+    private int mBgColorId;
+    
+    /**
+     * 创建日期
+     */
+    private long mCreatedDate;
+    
+    /**
+     * 是否有附件
+     */
+    private boolean mHasAttachment;
+    
+    /**
+     * 修改日期
+     */
+    private long mModifiedDate;
+    
+    /**
+     * 笔记数量（用于文件夹）
+     */
+    private int mNotesCount;
+    
+    /**
+     * 父文件夹ID
+     */
+    private long mParentId;
+    
+    /**
+     * 笔记摘要
+     */
+    private String mSnippet;
+    
+    /**
+     * 笔记类型
+     */
+    private int mType;
+    
+    /**
+     * 小组件ID
+     */
+    private int mWidgetId;
+    
+    /**
+     * 小组件类型
+     */
+    private int mWidgetType;
+    
+    /**
+     * 联系人名称（用于通话记录）
+     */
+    private String mName;
+    
+    /**
+     * 电话号码（用于通话记录）
+     */
+    private String mPhoneNumber;
+
+    /**
+     * 是否为最后一项
+     */
+    private boolean mIsLastItem;
+    
+    /**
+     * 是否为第一项
+     */
+    private boolean mIsFirstItem;
+    
+    /**
+     * 是否为唯一一项
+     */
+    private boolean mIsOnlyOneItem;
+    
+    /**
+     * 是否为文件夹后的唯一笔记
+     */
+    private boolean mIsOneNoteFollowingFolder;
+    
+    /**
+     * 是否为文件夹后的多个笔记
+     */
+    private boolean mIsMultiNotesFollowingFolder;
+
+    /**
+     * 构造函数，从游标中初始化笔记列表项数据
+     * @param context 上下文对象
+     * @param cursor 包含笔记数据的游标
+     */
+    public NoteItemData(Context context, Cursor cursor) {
+        mId = cursor.getLong(ID_COLUMN);
+        mAlertDate = cursor.getLong(ALERTED_DATE_COLUMN);
+        mBgColorId = cursor.getInt(BG_COLOR_ID_COLUMN);
+        mCreatedDate = cursor.getLong(CREATED_DATE_COLUMN);
+        mHasAttachment = (cursor.getInt(HAS_ATTACHMENT_COLUMN) > 0) ? true : false;
+        mModifiedDate = cursor.getLong(MODIFIED_DATE_COLUMN);
+        mNotesCount = cursor.getInt(NOTES_COUNT_COLUMN);
+        mParentId = cursor.getLong(PARENT_ID_COLUMN);
+        mSnippet = cursor.getString(SNIPPET_COLUMN);
+        mSnippet = mSnippet.replace(NoteEditActivity.TAG_CHECKED, "").replace(
+                NoteEditActivity.TAG_UNCHECKED, "");
+        mType = cursor.getInt(TYPE_COLUMN);
+        mWidgetId = cursor.getInt(WIDGET_ID_COLUMN);
+        mWidgetType = cursor.getInt(WIDGET_TYPE_COLUMN);
+
+        mPhoneNumber = "";
+        if (mParentId == Notes.ID_CALL_RECORD_FOLDER) {
+            mPhoneNumber = DataUtils.getCallNumberByNoteId(context.getContentResolver(), mId);
+            if (!TextUtils.isEmpty(mPhoneNumber)) {
+                mName = Contact.getContact(context, mPhoneNumber);
+                if (mName == null) {
+                    mName = mPhoneNumber;
+                }
+            }
+        }
+
+        if (mName == null) {
+            mName = "";
+        }
+        checkPostion(cursor);
+    }
+
+    /**
+     * 检查当前项在列表中的位置
+     * <p>
+     * 该方法用于判断当前项是否为第一项、最后一项、唯一一项，以及是否为文件夹后的笔记
+     * </p>
+     * @param cursor 包含笔记数据的游标
+     */
+    private void checkPostion(Cursor cursor) {
+        mIsLastItem = cursor.isLast() ? true : false;
+        mIsFirstItem = cursor.isFirst() ? true : false;
+        mIsOnlyOneItem = (cursor.getCount() == 1);
+        mIsMultiNotesFollowingFolder = false;
+        mIsOneNoteFollowingFolder = false;
+
+        if (mType == Notes.TYPE_NOTE && !mIsFirstItem) {
+            int position = cursor.getPosition();
+            if (cursor.moveToPrevious()) {
+                if (cursor.getInt(TYPE_COLUMN) == Notes.TYPE_FOLDER
+                        || cursor.getInt(TYPE_COLUMN) == Notes.TYPE_SYSTEM) {
+                    if (cursor.getCount() > (position + 1)) {
+                        mIsMultiNotesFollowingFolder = true;
+                    } else {
+                        mIsOneNoteFollowingFolder = true;
+                    }
+                }
+                if (!cursor.moveToNext()) {
+                    throw new IllegalStateException("cursor move to previous but can't move back");
+                }
+            }
+        }
+    }
+
+    /**
+     * 判断是否为文件夹后的唯一笔记
+     * @return 是否为文件夹后的唯一笔记
+     */
+    public boolean isOneFollowingFolder() {
+        return mIsOneNoteFollowingFolder;
+    }
+
+    /**
+     * 判断是否为文件夹后的多个笔记
+     * @return 是否为文件夹后的多个笔记
+     */
+    public boolean isMultiFollowingFolder() {
+        return mIsMultiNotesFollowingFolder;
+    }
+
+    /**
+     * 判断是否为最后一项
+     * @return 是否为最后一项
+     */
+    public boolean isLast() {
+        return mIsLastItem;
+    }
+
+    /**
+     * 获取通话记录联系人名称
+     * @return 通话记录联系人名称
+     */
+    public String getCallName() {
+        return mName;
+    }
+
+    /**
+     * 判断是否为第一项
+     * @return 是否为第一项
+     */
+    public boolean isFirst() {
+        return mIsFirstItem;
+    }
+
+    /**
+     * 判断是否为唯一一项
+     * @return 是否为唯一一项
+     */
+    public boolean isSingle() {
+        return mIsOnlyOneItem;
+    }
+
+    /**
+     * 获取笔记ID
+     * @return 笔记ID
+     */
+    public long getId() {
+        return mId;
+    }
+
+    /**
+     * 获取提醒日期
+     * @return 提醒日期，以毫秒为单位
+     */
+    public long getAlertDate() {
+        return mAlertDate;
+    }
+
+    /**
+     * 获取创建日期
+     * @return 创建日期，以毫秒为单位
+     */
+    public long getCreatedDate() {
+        return mCreatedDate;
+    }
+
+    /**
+     * 判断是否有附件
+     * @return 是否有附件
+     */
+    public boolean hasAttachment() {
+        return mHasAttachment;
+    }
+
+    /**
+     * 获取修改日期
+     * @return 修改日期，以毫秒为单位
+     */
+    public long getModifiedDate() {
+        return mModifiedDate;
+    }
+
+    /**
+     * 获取背景颜色ID
+     * @return 背景颜色ID
+     */
+    public int getBgColorId() {
+        return mBgColorId;
+    }
+
+    /**
+     * 获取父文件夹ID
+     * @return 父文件夹ID
+     */
+    public long getParentId() {
+        return mParentId;
+    }
+
+    /**
+     * 获取笔记数量（用于文件夹）
+     * @return 笔记数量
+     */
+    public int getNotesCount() {
+        return mNotesCount;
+    }
+
+    /**
+     * 获取文件夹ID
+     * @return 文件夹ID
+     */
+    public long getFolderId () {
+        return mParentId;
+    }
+
+    /**
+     * 获取笔记类型
+     * @return 笔记类型
+     */
+    public int getType() {
+        return mType;
+    }
+
+    /**
+     * 获取小组件类型
+     * @return 小组件类型
+     */
+    public int getWidgetType() {
+        return mWidgetType;
+    }
+
+    /**
+     * 获取小组件ID
+     * @return 小组件ID
+     */
+    public int getWidgetId() {
+        return mWidgetId;
+    }
+
+    /**
+     * 获取笔记摘要
+     * @return 笔记摘要
+     */
+    public String getSnippet() {
+        return mSnippet;
+    }
+
+    /**
+     * 判断是否有提醒
+     * @return 是否有提醒
+     */
+    public boolean hasAlert() {
+        return (mAlertDate > 0);
+    }
+
+    /**
+     * 判断是否为通话记录
+     * @return 是否为通话记录
+     */
+    public boolean isCallRecord() {
+        return (mParentId == Notes.ID_CALL_RECORD_FOLDER && !TextUtils.isEmpty(mPhoneNumber));
+    }
+
+    /**
+     * 获取笔记类型（静态方法）
+     * @param cursor 包含笔记数据的游标
+     * @return 笔记类型
+     */
+    public static int getNoteType(Cursor cursor) {
+        return cursor.getInt(TYPE_COLUMN);
+    }
+}

src/main/java/net/micode/notes/ui/NotesListAdapter.java

@@ -0,0 +1,304 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.util.Log;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CursorAdapter;
+
+import net.micode.notes.data.Notes;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+
+
+/**
+ * 笔记列表适配器类
+ * <p>
+ * 该类是CursorAdapter的子类，用于将数据库中的笔记数据绑定到列表视图上，
+ * 支持普通浏览模式和选择模式，能够管理选中的项目，并提供了各种方法来处理
+ * 列表项的选择状态、获取选中项目ID等功能。
+ * </p>
+ */
+public class NotesListAdapter extends CursorAdapter {
+    /** 日志标签 */
+    private static final String TAG = "NotesListAdapter";
+    /** 上下文对象 */
+    private Context mContext;
+    /** 保存选中项目的位置和状态 */
+    private HashMap<Integer, Boolean> mSelectedIndex;
+    /** 笔记数量 */
+    private int mNotesCount;
+    /** 是否处于选择模式 */
+    private boolean mChoiceMode;
+
+    /**
+     * 应用桌面组件属性类
+     * <p>
+     * 该类用于存储桌面组件的相关属性，包括组件ID和组件类型
+     * </p>
+     */
+    public static class AppWidgetAttribute {
+        /** 桌面组件ID */
+        public int widgetId;
+        /** 桌面组件类型 */
+        public int widgetType;
+    };
+
+    /**
+     * 构造函数
+     * <p>
+     * 初始化NotesListAdapter，创建选中项目的映射表，并设置初始上下文和笔记数量
+     * </p>
+     * @param context 上下文对象
+     */
+    public NotesListAdapter(Context context) {
+        super(context, null);
+        mSelectedIndex = new HashMap<Integer, Boolean>();
+        mContext = context;
+        mNotesCount = 0;
+    }
+
+    /**
+     * 创建新的列表项视图
+     * <p>
+     * 该方法在需要为新的数据项创建视图时调用，返回一个新的NotesListItem实例
+     * </p>
+     * @param context 上下文对象
+     * @param cursor 数据游标
+     * @param parent 父视图组
+     * @return 新创建的列表项视图
+     */
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new NotesListItem(context);
+    }
+
+    /**
+     * 将数据绑定到列表项视图
+     * <p>
+     * 该方法在需要将数据绑定到现有视图时调用，将游标中的数据转换为NoteItemData对象，
+     * 并调用NotesListItem的bind方法将数据绑定到视图上
+     * </p>
+     * @param view 要绑定数据的视图
+     * @param context 上下文对象
+     * @param cursor 数据游标
+     */
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof NotesListItem) {
+            NoteItemData itemData = new NoteItemData(context, cursor);
+            ((NotesListItem) view).bind(context, itemData, mChoiceMode,
+                    isSelectedItem(cursor.getPosition()));
+        }
+    }
+
+    /**
+     * 设置指定位置的项是否被选中
+     * <p>
+     * 该方法用于在选择模式下设置指定位置的项的选中状态，并通知数据集变化
+     * </p>
+     * @param position 项的位置
+     * @param checked 是否被选中
+     */
+    public void setCheckedItem(final int position, final boolean checked) {
+        mSelectedIndex.put(position, checked);
+        notifyDataSetChanged();
+    }
+
+    /**
+     * 检查是否处于选择模式
+     * @return 是否处于选择模式
+     */
+    public boolean isInChoiceMode() {
+        return mChoiceMode;
+    }
+
+    /**
+     * 设置是否进入选择模式
+     * <p>
+     * 该方法用于切换选择模式，进入选择模式时会清除之前的选中状态
+     * </p>
+     * @param mode 是否进入选择模式
+     */
+    public void setChoiceMode(boolean mode) {
+        mSelectedIndex.clear();
+        mChoiceMode = mode;
+    }
+
+    /**
+     * 全选或取消全选
+     * <p>
+     * 该方法用于在选择模式下全选或取消全选所有普通笔记项
+     * </p>
+     * @param checked 是否全选
+     */
+    public void selectAll(boolean checked) {
+        Cursor cursor = getCursor();
+        for (int i = 0; i < getCount(); i++) {
+            if (cursor.moveToPosition(i)) {
+                if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) {
+                    setCheckedItem(i, checked);
+                }
+            }
+        }
+    }
+
+    /**
+     * 获取所有选中项的ID
+     * <p>
+     * 该方法用于获取选择模式下所有选中项的ID集合，排除根文件夹ID
+     * </p>
+     * @return 选中项的ID集合
+     */
+    public HashSet<Long> getSelectedItemIds() {
+        HashSet<Long> itemSet = new HashSet<Long>();
+        for (Integer position : mSelectedIndex.keySet()) {
+            if (mSelectedIndex.get(position) == true) {
+                Long id = getItemId(position);
+                if (id == Notes.ID_ROOT_FOLDER) {
+                    Log.d(TAG, "Wrong item id, should not happen");
+                } else {
+                    itemSet.add(id);
+                }
+            }
+        }
+
+        return itemSet;
+    }
+
+    /**
+     * 获取所有选中的桌面组件属性
+     * <p>
+     * 该方法用于获取选择模式下所有选中的桌面组件的属性集合
+     * </p>
+     * @return 选中的桌面组件属性集合，若获取失败则返回null
+     */
+    public HashSet<AppWidgetAttribute> getSelectedWidget() {
+        HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
+        for (Integer position : mSelectedIndex.keySet()) {
+            if (mSelectedIndex.get(position) == true) {
+                Cursor c = (Cursor) getItem(position);
+                if (c != null) {
+                    AppWidgetAttribute widget = new AppWidgetAttribute();
+                    NoteItemData item = new NoteItemData(mContext, c);
+                    widget.widgetId = item.getWidgetId();
+                    widget.widgetType = item.getWidgetType();
+                    itemSet.add(widget);
+                    /**
+                     * Don't close cursor here, only the adapter could close it
+                     */
+                } else {
+                    Log.e(TAG, "Invalid cursor");
+                    return null;
+                }
+            }
+        }
+        return itemSet;
+    }
+
+    /**
+     * 获取选中项的数量
+     * @return 选中项的数量
+     */
+    public int getSelectedCount() {
+        Collection<Boolean> values = mSelectedIndex.values();
+        if (null == values) {
+            return 0;
+        }
+        Iterator<Boolean> iter = values.iterator();
+        int count = 0;
+        while (iter.hasNext()) {
+            if (true == iter.next()) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    /**
+     * 检查是否所有可选中项都已选中
+     * @return 是否所有可选中项都已选中
+     */
+    public boolean isAllSelected() {
+        int checkedCount = getSelectedCount();
+        return (checkedCount != 0 && checkedCount == mNotesCount);
+    }
+
+    /**
+     * 检查指定位置的项是否被选中
+     * @param position 项的位置
+     * @return 是否被选中
+     */
+    public boolean isSelectedItem(final int position) {
+        if (null == mSelectedIndex.get(position)) {
+            return false;
+        }
+        return mSelectedIndex.get(position);
+    }
+
+    /**
+     * 当数据内容变化时调用
+     * <p>
+     * 该方法在数据内容发生变化时被调用，会重新计算笔记数量
+     * </p>
+     */
+    @Override
+    protected void onContentChanged() {
+        super.onContentChanged();
+        calcNotesCount();
+    }
+
+    /**
+     * 更换数据游标
+     * <p>
+     * 该方法在更换数据游标时被调用，会重新计算笔记数量
+     * </p>
+     * @param cursor 新的数据游标
+     */
+    @Override
+    public void changeCursor(Cursor cursor) {
+        super.changeCursor(cursor);
+        calcNotesCount();
+    }
+
+    /**
+     * 计算笔记数量
+     * <p>
+     * 该方法用于统计当前数据集中的普通笔记数量，并更新mNotesCount成员变量
+     * </p>
+     */
+    private void calcNotesCount() {
+        mNotesCount = 0;
+        for (int i = 0; i < getCount(); i++) {
+            Cursor c = (Cursor) getItem(i);
+            if (c != null) {
+                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) {
+                    mNotesCount++;
+                }
+            } else {
+                Log.e(TAG, "Invalid cursor");
+                return;
+            }
+        }
+    }
+}

src/main/java/net/micode/notes/ui/NotesListItem.java

@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.widget.CheckBox;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.ResourceParser.NoteItemBgResources;
+
+
+/**
+ * 笔记列表项视图类
+ * <p>
+ * 该类用于显示笔记列表中的单个条目，包含笔记的标题、时间、提醒图标等UI元素，
+ * 并能根据不同的笔记类型（普通笔记、文件夹、通话记录）和状态（选择模式、是否有提醒）
+ * 进行动态展示和样式调整
+ * </p>
+ */
+public class NotesListItem extends LinearLayout {
+    /** 提醒图标，用于显示笔记是否设置了提醒 */
+    private ImageView mAlert;
+    /** 笔记标题文本视图 */
+    private TextView mTitle;
+    /** 笔记时间文本视图 */
+    private TextView mTime;
+    /** 通话记录名称文本视图 */
+    private TextView mCallName;
+    /** 列表项数据对象，存储笔记的相关信息 */
+    private NoteItemData mItemData;
+    /** 选择框，用于选择模式下选择笔记 */
+    private CheckBox mCheckBox;
+
+    /**
+     * 构造函数
+     * <p>
+     * 初始化NotesListItem视图，加载布局文件并获取各个UI组件的引用
+     * </p>
+     * @param context 上下文对象
+     */
+    public NotesListItem(Context context) {
+        super(context);
+        inflate(context, R.layout.note_item, this);
+        mAlert = (ImageView) findViewById(R.id.iv_alert_icon);
+        mTitle = (TextView) findViewById(R.id.tv_title);
+        mTime = (TextView) findViewById(R.id.tv_time);
+        mCallName = (TextView) findViewById(R.id.tv_name);
+        mCheckBox = (CheckBox) findViewById(android.R.id.checkbox);
+    }
+
+    /**
+     * 将笔记数据绑定到列表项视图
+     * <p>
+     * 该方法根据笔记数据的类型和状态，动态调整列表项的UI显示，包括：
+     * 1. 根据选择模式和笔记类型决定是否显示复选框
+     * 2. 根据笔记类型（通话记录文件夹、普通通话记录、普通笔记、文件夹）设置不同的UI样式
+     * 3. 设置标题、时间、提醒图标等内容
+     * 4. 调用setBackground方法设置背景样式
+     * </p>
+     * @param context 上下文对象
+     * @param data 笔记列表项数据
+     * @param choiceMode 是否处于选择模式
+     * @param checked 选择模式下是否被选中
+     */
+    public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) {
+        if (choiceMode && data.getType() == Notes.TYPE_NOTE) {
+            mCheckBox.setVisibility(View.VISIBLE);
+            mCheckBox.setChecked(checked);
+        } else {
+            mCheckBox.setVisibility(View.GONE);
+        }
+
+        mItemData = data;
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mCallName.setVisibility(View.GONE);
+            mAlert.setVisibility(View.VISIBLE);
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);
+            mTitle.setText(context.getString(R.string.call_record_folder_name)
+                    + context.getString(R.string.format_folder_files_count, data.getNotesCount()));
+            mAlert.setImageResource(R.drawable.call_record);
+        } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mCallName.setVisibility(View.VISIBLE);
+            mCallName.setText(data.getCallName());
+            mTitle.setTextAppearance(context,R.style.TextAppearanceSecondaryItem);
+            mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet()));
+            if (data.hasAlert()) {
+                mAlert.setImageResource(R.drawable.clock);
+                mAlert.setVisibility(View.VISIBLE);
+            } else {
+                mAlert.setVisibility(View.GONE);
+            }
+        } else {
+            mCallName.setVisibility(View.GONE);
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);
+
+            if (data.getType() == Notes.TYPE_FOLDER) {
+                mTitle.setText(data.getSnippet()
+                        + context.getString(R.string.format_folder_files_count,
+                                data.getNotesCount()));
+                mAlert.setVisibility(View.GONE);
+            } else {
+                mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet()));
+                if (data.hasAlert()) {
+                    mAlert.setImageResource(R.drawable.clock);
+                    mAlert.setVisibility(View.VISIBLE);
+                } else {
+                    mAlert.setVisibility(View.GONE);
+                }
+            }
+        }
+        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate()));
+
+        setBackground(data);
+    }
+
+    /**
+     * 设置列表项的背景样式
+     * <p>
+     * 该方法根据笔记数据的类型和状态，选择并设置合适的背景资源：
+     * 1. 对于普通笔记，根据其在列表中的位置（单个、第一个、最后一个、中间）选择不同的背景
+     * 2. 对于文件夹或其他类型，使用默认的文件夹背景
+     * </p>
+     * @param data 笔记列表项数据，包含背景颜色ID、类型和位置信息
+     */
+    private void setBackground(NoteItemData data) {
+        int id = data.getBgColorId();
+        if (data.getType() == Notes.TYPE_NOTE) {
+            if (data.isSingle() || data.isOneFollowingFolder()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgSingleRes(id));
+            } else if (data.isLast()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgLastRes(id));
+            } else if (data.isFirst() || data.isMultiFollowingFolder()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgFirstRes(id));
+            } else {
+                setBackgroundResource(NoteItemBgResources.getNoteBgNormalRes(id));
+            }
+        } else {
+            setBackgroundResource(NoteItemBgResources.getFolderBgRes());
+        }
+    }
+
+    /**
+     * 获取列表项的数据对象
+     * @return 笔记列表项数据对象
+     */
+    public NoteItemData getItemData() {
+        return mItemData;
+    }
+}

src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java

@@ -0,0 +1,554 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.app.ActionBar;
+import android.app.AlertDialog;
+import android.content.BroadcastReceiver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceClickListener;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceCategory;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.remote.GTaskSyncService;
+
+
+/**
+ * 笔记偏好设置活动类
+ * <p>
+ * 该类用于处理笔记应用的设置，包括同步账户管理、背景颜色设置等功能，
+ * 提供了UI界面让用户进行偏好设置，并与GTaskSyncService进行交互实现同步功能
+ * </p>
+ */
+public class NotesPreferenceActivity extends PreferenceActivity {
+    /** 偏好设置文件名 */
+    public static final String PREFERENCE_NAME = "notes_preferences";
+
+    /** 同步账户名的偏好键 */
+    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name";
+
+    /** 最后同步时间的偏好键 */
+    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time";
+
+    /** 背景颜色随机出现的偏好键 */
+    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";
+
+    /** 同步账户的偏好键 */
+    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";
+
+    /** 权限过滤器键 */
+    private static final String AUTHORITIES_FILTER_KEY = "authorities";
+
+    /** 账户偏好设置分类 */
+    private PreferenceCategory mAccountCategory;
+
+    /** GTask同步服务广播接收器 */
+    private GTaskReceiver mReceiver;
+
+    /** 原始账户列表 */
+    private Account[] mOriAccounts;
+
+    /** 是否添加了新账户 */
+    private boolean mHasAddedAccount;
+
+    /**
+     * 活动创建时调用
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 设置导航栏显示应用图标
+     * 2. 加载偏好设置资源
+     * 3. 初始化账户偏好设置分类
+     * 4. 注册GTask同步服务广播接收器
+     * 5. 为列表视图添加头部
+     * </p>
+     * @param icicle 保存的实例状态
+     */
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        /* using the app icon for navigation */
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+
+        addPreferencesFromResource(R.xml.preferences);
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
+        mReceiver = new GTaskReceiver();
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
+        registerReceiver(mReceiver, filter);
+
+        mOriAccounts = null;
+        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null);
+        getListView().addHeaderView(header, null, true);
+    }
+
+    /**
+     * 活动恢复时调用
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 如果添加了新账户，自动设置同步账户
+     * 2. 刷新UI界面
+     * </p>
+     */
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        // need to set sync account automatically if user has added a new
+        // account
+        if (mHasAddedAccount) {
+            Account[] accounts = getGoogleAccounts();
+            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {
+                for (Account accountNew : accounts) {
+                    boolean found = false;
+                    for (Account accountOld : mOriAccounts) {
+                        if (TextUtils.equals(accountOld.name, accountNew.name)) {
+                            found = true;
+                            break;
+                        }
+                    }
+                    if (!found) {
+                        setSyncAccount(accountNew.name);
+                        break;
+                    }
+                }
+            }
+        }
+
+        refreshUI();
+    }
+
+    /**
+     * 活动销毁时调用
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 注销GTask同步服务广播接收器
+     * </p>
+     */
+    @Override
+    protected void onDestroy() {
+        if (mReceiver != null) {
+            unregisterReceiver(mReceiver);
+        }
+        super.onDestroy();
+    }
+
+    /**
+     * 加载账户偏好设置
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 清空账户偏好设置分类中的所有偏好项
+     * 2. 创建新的账户偏好项
+     * 3. 设置账户偏好项的标题、摘要和点击监听器
+     * 4. 根据当前同步状态和账户设置情况，决定点击时显示的对话框
+     * 5. 将账户偏好项添加到分类中
+     * </p>
+     */
+    private void loadAccountPreference() {
+        mAccountCategory.removeAll();
+
+        Preference accountPref = new Preference(this);
+        final String defaultAccount = getSyncAccountName(this);
+        accountPref.setTitle(getString(R.string.preferences_account_title));
+        accountPref.setSummary(getString(R.string.preferences_account_summary));
+        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+            public boolean onPreferenceClick(Preference preference) {
+                if (!GTaskSyncService.isSyncing()) {
+                    if (TextUtils.isEmpty(defaultAccount)) {
+                        // the first time to set account
+                        showSelectAccountAlertDialog();
+                    } else {
+                        // if the account has already been set, we need to promp
+                        // user about the risk
+                        showChangeAccountConfirmAlertDialog();
+                    }
+                } else {
+                    Toast.makeText(NotesPreferenceActivity.this,
+                            R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
+                            .show();
+                }
+                return true;
+            }
+        });
+
+        mAccountCategory.addPreference(accountPref);
+    }
+
+    /**
+     * 加载同步按钮和状态
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 获取同步按钮和最后同步时间视图
+     * 2. 根据同步状态设置按钮文本和点击事件
+     * 3. 根据是否有同步账户设置按钮可用性
+     * 4. 设置最后同步时间或同步进度
+     * </p>
+     */
+    private void loadSyncButton() {
+        Button syncButton = (Button) findViewById(R.id.preference_sync_button);
+        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+
+        // set button state
+        if (GTaskSyncService.isSyncing()) {
+            syncButton.setText(getString(R.string.preferences_button_sync_cancel));
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this);
+                }
+            });
+        } else {
+            syncButton.setText(getString(R.string.preferences_button_sync_immediately));
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.startSync(NotesPreferenceActivity.this);
+                }
+            });
+        }
+        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));
+
+        // set last sync time
+        if (GTaskSyncService.isSyncing()) {
+            lastSyncTimeView.setText(GTaskSyncService.getProgressString());
+            lastSyncTimeView.setVisibility(View.VISIBLE);
+        } else {
+            long lastSyncTime = getLastSyncTime(this);
+            if (lastSyncTime != 0) {
+                lastSyncTimeView.setText(getString(R.string.preferences_last_sync_time,
+                        DateFormat.format(getString(R.string.preferences_last_sync_time_format),
+                                lastSyncTime)));
+                lastSyncTimeView.setVisibility(View.VISIBLE);
+            } else {
+                lastSyncTimeView.setVisibility(View.GONE);
+            }
+        }
+    }
+
+    /**
+     * 刷新UI界面
+     * <p>
+     * 该方法调用loadAccountPreference和loadSyncButton方法来刷新UI界面
+     * </p>
+     */
+    private void refreshUI() {
+        loadAccountPreference();
+        loadSyncButton();
+    }
+
+    /**
+     * 显示选择账户对话框
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 创建对话框构建器并设置自定义标题
+     * 2. 获取Google账户列表
+     * 3. 如果有账户，显示单选列表供用户选择
+     * 4. 添加添加新账户的选项
+     * 5. 处理用户选择事件
+     * </p>
+     */
+    private void showSelectAccountAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_select_account_title));
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_select_account_tips));
+
+        dialogBuilder.setCustomTitle(titleView);
+        dialogBuilder.setPositiveButton(null, null);
+
+        Account[] accounts = getGoogleAccounts();
+        String defAccount = getSyncAccountName(this);
+
+        mOriAccounts = accounts;
+        mHasAddedAccount = false;
+
+        if (accounts.length > 0) {
+            CharSequence[] items = new CharSequence[accounts.length];
+            final CharSequence[] itemMapping = items;
+            int checkedItem = -1;
+            int index = 0;
+            for (Account account : accounts) {
+                if (TextUtils.equals(account.name, defAccount)) {
+                    checkedItem = index;
+                }
+                items[index++] = account.name;
+            }
+            dialogBuilder.setSingleChoiceItems(items, checkedItem,
+                    new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int which) {
+                            setSyncAccount(itemMapping[which].toString());
+                            dialog.dismiss();
+                            refreshUI();
+                        }
+                    });
+        }
+
+        View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null);
+        dialogBuilder.setView(addAccountView);
+
+        final AlertDialog dialog = dialogBuilder.show();
+        addAccountView.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                mHasAddedAccount = true;
+                Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
+                intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] {
+                    "gmail-ls"
+                });
+                startActivityForResult(intent, -1);
+                dialog.dismiss();
+            }
+        });
+    }
+
+    /**
+     * 显示更改账户确认对话框
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 创建对话框构建器并设置自定义标题
+     * 2. 添加选项：更改账户、移除账户、取消
+     * 3. 处理用户选择事件
+     * </p>
+     */
+    private void showChangeAccountConfirmAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_change_account_title,
+                getSyncAccountName(this)));
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_change_account_warn_msg));
+        dialogBuilder.setCustomTitle(titleView);
+
+        CharSequence[] menuItemArray = new CharSequence[] {
+                getString(R.string.preferences_menu_change_account),
+                getString(R.string.preferences_menu_remove_account),
+                getString(R.string.preferences_menu_cancel)
+        };
+        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                if (which == 0) {
+                    showSelectAccountAlertDialog();
+                } else if (which == 1) {
+                    removeSyncAccount();
+                    refreshUI();
+                }
+            }
+        });
+        dialogBuilder.show();
+    }
+
+    /**
+     * 获取Google账户列表
+     * <p>
+     * 该方法通过AccountManager获取设备上的所有Google账户
+     * </p>
+     * @return Google账户数组
+     */
+    private Account[] getGoogleAccounts() {
+        AccountManager accountManager = AccountManager.get(this);
+        return accountManager.getAccountsByType("com.google");
+    }
+
+    /**
+     * 设置同步账户
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 更新同步账户偏好设置
+     * 2. 清除最后同步时间
+     * 3. 清除本地GTask相关信息
+     * 4. 显示成功提示
+     * </p>
+     * @param account 要设置的同步账户名
+     */
+    private void setSyncAccount(String account) {
+        if (!getSyncAccountName(this).equals(account)) {
+            SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+            SharedPreferences.Editor editor = settings.edit();
+            if (account != null) {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, account);
+            } else {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+            }
+            editor.commit();
+
+            // clean up last sync time
+            setLastSyncTime(this, 0);
+
+            // clean up local gtask related info
+            new Thread(new Runnable() {
+                public void run() {
+                    ContentValues values = new ContentValues();
+                    values.put(NoteColumns.GTASK_ID, "");
+                    values.put(NoteColumns.SYNC_ID, 0);
+                    getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+                }
+            }).start();
+
+            Toast.makeText(NotesPreferenceActivity.this,
+                    getString(R.string.preferences_toast_success_set_accout, account),
+                    Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    /**
+     * 移除同步账户
+     * <p>
+     * 该方法完成以下工作：
+     * 1. 移除同步账户偏好设置
+     * 2. 移除最后同步时间偏好设置
+     * 3. 清除本地GTask相关信息
+     * </p>
+     */
+    private void removeSyncAccount() {
+        SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = settings.edit();
+        if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) {
+            editor.remove(PREFERENCE_SYNC_ACCOUNT_NAME);
+        }
+        if (settings.contains(PREFERENCE_LAST_SYNC_TIME)) {
+            editor.remove(PREFERENCE_LAST_SYNC_TIME);
+        }
+        editor.commit();
+
+        // clean up local gtask related info
+        new Thread(new Runnable() {
+            public void run() {
+                ContentValues values = new ContentValues();
+                values.put(NoteColumns.GTASK_ID, "");
+                values.put(NoteColumns.SYNC_ID, 0);
+                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+            }
+        }).start();
+    }
+
+    /**
+     * 获取同步账户名
+     * <p>
+     * 该方法从偏好设置中获取同步账户名
+     * </p>
+     * @param context 上下文对象
+     * @return 同步账户名，如果未设置则返回空字符串
+     */
+    public static String getSyncAccountName(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+    }
+
+    /**
+     * 设置最后同步时间
+     * <p>
+     * 该方法将最后同步时间保存到偏好设置中
+     * </p>
+     * @param context 上下文对象
+     * @param time 最后同步时间（毫秒）
+     */
+    public static void setLastSyncTime(Context context, long time) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = settings.edit();
+        editor.putLong(PREFERENCE_LAST_SYNC_TIME, time);
+        editor.commit();
+    }
+
+    /**
+     * 获取最后同步时间
+     * <p>
+     * 该方法从偏好设置中获取最后同步时间
+     * </p>
+     * @param context 上下文对象
+     * @return 最后同步时间（毫秒），如果未设置则返回0
+     */
+    public static long getLastSyncTime(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0);
+    }
+
+    /**
+     * GTask同步服务广播接收器
+     * <p>
+     * 该类用于接收GTaskSyncService发送的广播，更新UI界面和同步状态
+     * </p>
+     */
+    private class GTaskReceiver extends BroadcastReceiver {
+
+        /**
+         * 接收广播时调用
+         * <p>
+         * 该方法完成以下工作：
+         * 1. 刷新UI界面
+         * 2. 如果正在同步，更新同步状态文本
+         * </p>
+         * @param context 上下文对象
+         * @param intent 广播意图，包含同步状态和进度信息
+         */
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            refreshUI();
+            if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) {
+                TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+                syncStatus.setText(intent
+                        .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG));
+            }
+
+        }
+    }
+
+    /**
+     * 处理选项菜单点击事件
+     * <p>
+     * 该方法处理选项菜单的点击事件，目前只处理了返回按钮的点击事件
+     * </p>
+     * @param item 被点击的菜单项
+     * @return 是否处理了该事件
+     */
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                Intent intent = new Intent(this, NotesListActivity.class);
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                startActivity(intent);
+                return true;
+            default:
+                return false;
+        }
+    }
+}

src/main/java/net/micode/notes/widget/NoteWidgetProvider.java

@@ -0,0 +1,224 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.widget;
+import android.app.PendingIntent;
+import android.appwidget.AppWidgetManager;
+import android.appwidget.AppWidgetProvider;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.util.Log;
+import android.widget.RemoteViews;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.tool.ResourceParser;
+import net.micode.notes.ui.NoteEditActivity;
+import net.micode.notes.ui.NotesListActivity;
+
+/**
+ * 笔记小组件基类
+ * <p>
+ * 该抽象类为所有笔记小组件提供核心功能，包括小组件数据管理、UI更新、点击事件处理
+ * 和小组件删除管理。它支持不同的小组件类型和布局，通过抽象方法让子类实现特定的
+ * 布局和资源配置
+ * </p>
+ */
+public abstract class NoteWidgetProvider extends AppWidgetProvider {
+    /**
+     * 小组件数据查询的投影列数组
+     * <p>
+     * 定义了从数据库查询笔记数据时需要获取的列，包括笔记ID、背景颜色ID和摘要内容
+     * </p>
+     */
+    public static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.BG_COLOR_ID,
+        NoteColumns.SNIPPET
+    };
+
+    /**
+     * 查询结果中ID列的索引
+     */
+    public static final int COLUMN_ID           = 0;
+    
+    /**
+     * 查询结果中背景颜色ID列的索引
+     */
+    public static final int COLUMN_BG_COLOR_ID  = 1;
+    
+    /**
+     * 查询结果中摘要内容列的索引
+     */
+    public static final int COLUMN_SNIPPET      = 2;
+
+    /**
+     * 日志标签，用于小组件相关的日志输出
+     */
+    private static final String TAG = "NoteWidgetProvider";
+
+    /**
+     * 当小组件被删除时调用的方法
+     * <p>
+     * 该方法将数据库中与被删除小组件关联的笔记的WIDGET_ID字段更新为无效值，
+     * 解除笔记与已删除小组件的关联关系
+     * </p>
+     * @param context 上下文对象
+     * @param appWidgetIds 被删除的小组件ID数组
+     */
+    @Override
+    public void onDeleted(Context context, int[] appWidgetIds) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            context.getContentResolver().update(Notes.CONTENT_NOTE_URI,
+                    values,
+                    NoteColumns.WIDGET_ID + "=?",
+                    new String[] { String.valueOf(appWidgetIds[i])});
+        }
+    }
+
+    /**
+     * 查询与特定小组件ID关联的笔记信息
+     * <p>
+     * 该方法从数据库中查询与给定小组件ID关联的笔记数据，并排除已删除到回收站的笔记
+     * </p>
+     * @param context 上下文对象
+     * @param widgetId 要查询的小组件ID
+     * @return 返回包含笔记信息的Cursor对象，使用PROJECTION中定义的列
+     */
+    private Cursor getNoteWidgetInfo(Context context, int widgetId) {
+        return context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                PROJECTION,
+                NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[] { String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER) },
+                null);
+    }
+
+    /**
+     * 更新小组件的UI和数据
+     * <p>
+     * 该方法是update方法的公共保护接口，默认使用非隐私模式更新小组件
+     * </p>
+     * @param context 上下文对象
+     * @param appWidgetManager 小组件管理器
+     * @param appWidgetIds 要更新的小组件ID数组
+     */
+    protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        update(context, appWidgetManager, appWidgetIds, false);
+    }
+
+    /**
+     * 更新小组件的UI和数据（私有实现）
+     * <p>
+     * 该方法负责实际更新小组件的内容，支持隐私模式和正常模式：
+     * 1. 查询与小组件关联的笔记信息
+     * 2. 根据查询结果设置小组件显示的文本和背景
+     * 3. 创建点击小组件时的PendingIntent
+     * 4. 在隐私模式下显示特定提示文本并跳转到笔记列表
+     * 5. 在正常模式下显示笔记内容并支持查看或创建笔记
+     * </p>
+     * @param context 上下文对象
+     * @param appWidgetManager 小组件管理器
+     * @param appWidgetIds 要更新的小组件ID数组
+     * @param privacyMode 是否处于隐私模式
+     */
+    private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
+            boolean privacyMode) {
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
+                int bgId = ResourceParser.getDefaultBgId(context);
+                String snippet = "";
+                Intent intent = new Intent(context, NoteEditActivity.class);
+                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());
+
+                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
+                if (c != null && c.moveToFirst()) {
+                    if (c.getCount() > 1) {
+                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
+                        c.close();
+                        return;
+                    }
+                    snippet = c.getString(COLUMN_SNIPPET);
+                    bgId = c.getInt(COLUMN_BG_COLOR_ID);
+                    intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID));
+                    intent.setAction(Intent.ACTION_VIEW);
+                } else {
+                    snippet = context.getResources().getString(R.string.widget_havenot_content);
+                    intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+                }
+
+                if (c != null) {
+                    c.close();
+                }
+
+                RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
+                rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
+                intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);
+                /**
+                 * Generate the pending intent to start host for the widget
+                 */
+                PendingIntent pendingIntent = null;
+                if (privacyMode) {
+                    rv.setTextViewText(R.id.widget_text,
+                            context.getString(R.string.widget_under_visit_mode));
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
+                            context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
+                } else {
+                    rv.setTextViewText(R.id.widget_text, snippet);
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
+                            PendingIntent.FLAG_UPDATE_CURRENT);
+                }
+
+                rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
+                appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
+            }
+        }
+    }
+
+    /**
+     * 根据背景颜色ID获取对应的背景资源ID
+     * <p>
+     * 该方法由子类实现，用于将数据库中的背景颜色ID转换为实际的资源ID
+     * </p>
+     * @param bgId 数据库中的背景颜色ID
+     * @return 对应的背景资源ID
+     */
+    protected abstract int getBgResourceId(int bgId);
+
+    /**
+     * 获取小组件的布局ID
+     * <p>
+     * 该方法由子类实现，返回特定小组件类型的布局资源ID
+     * </p>
+     * @return 小组件布局资源ID
+     */
+    protected abstract int getLayoutId();
+
+    /**
+     * 获取小组件类型
+     * <p>
+     * 该方法由子类实现，返回特定小组件的类型标识
+     * </p>
+     * @return 小组件类型标识
+     */
+    protected abstract int getWidgetType();
+}

src/main/java/net/micode/notes/widget/NoteWidgetProvider_2x.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.widget;
+
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.ResourceParser;
+
+
+/**
+ * 2x尺寸的笔记小组件实现类
+ * <p>
+ * 该类继承自NoteWidgetProvider抽象类，实现了2x尺寸笔记小组件的具体功能
+ * 包括布局设置、背景资源获取和小组件类型定义
+ * </p>
+ */
+public class NoteWidgetProvider_2x extends NoteWidgetProvider {
+    /**
+     * 更新小组件的UI和数据
+     * <p>
+     * 该方法重写了AppWidgetProvider的onUpdate方法，调用父类的update方法来更新2x尺寸小组件
+     * </p>
+     * @param context 上下文对象
+     * @param appWidgetManager 小组件管理器
+     * @param appWidgetIds 要更新的小组件ID数组
+     */
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    /**
+     * 获取2x尺寸小组件的布局ID
+     * <p>
+     * 返回2x尺寸小组件的布局资源ID
+     * </p>
+     * @return 2x小组件布局资源ID
+     */
+    @Override
+    protected int getLayoutId() {
+        return R.layout.widget_2x;
+    }
+
+    /**
+     * 根据背景颜色ID获取2x小组件对应的背景资源ID
+     * <p>
+     * 通过ResourceParser获取2x尺寸小组件的背景资源ID
+     * </p>
+     * @param bgId 数据库中的背景颜色ID
+     * @return 2x小组件对应的背景资源ID
+     */
+    @Override
+    protected int getBgResourceId(int bgId) {
+        return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId);
+    }
+
+    /**
+     * 获取2x小组件类型
+     * <p>
+     * 返回2x尺寸小组件的类型标识
+     * </p>
+     * @return 2x小组件类型标识
+     */
+    @Override
+    protected int getWidgetType() {
+        return Notes.TYPE_WIDGET_2X;
+    }
+}

src/main/java/net/micode/notes/widget/NoteWidgetProvider_4x.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.widget;
+
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.ResourceParser;
+
+
+/**
+ * 4x尺寸的笔记小组件实现类
+ * <p>
+ * 该类继承自NoteWidgetProvider抽象类，实现了4x尺寸笔记小组件的具体功能
+ * 包括布局设置、背景资源获取和小组件类型定义
+ * </p>
+ */
+public class NoteWidgetProvider_4x extends NoteWidgetProvider {
+    /**
+     * 更新小组件的UI和数据
+     * <p>
+     * 该方法重写了AppWidgetProvider的onUpdate方法，调用父类的update方法来更新4x尺寸小组件
+     * </p>
+     * @param context 上下文对象
+     * @param appWidgetManager 小组件管理器
+     * @param appWidgetIds 要更新的小组件ID数组
+     */
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    /**
+     * 获取4x尺寸小组件的布局ID
+     * <p>
+     * 返回4x尺寸小组件的布局资源ID
+     * </p>
+     * @return 4x小组件布局资源ID
+     */
+    @Override
+    protected int getLayoutId() {
+        return R.layout.widget_4x;
+    }
+
+    /**
+     * 根据背景颜色ID获取4x小组件对应的背景资源ID
+     * <p>
+     * 通过ResourceParser获取4x尺寸小组件的背景资源ID
+     * </p>
+     * @param bgId 数据库中的背景颜色ID
+     * @return 4x小组件对应的背景资源ID
+     */
+    @Override
+    protected int getBgResourceId(int bgId) {
+        return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId);
+    }
+
+    /**
+     * 获取4x小组件类型
+     * <p>
+     * 返回4x尺寸小组件的类型标识
+     * </p>
+     * @return 4x小组件类型标识
+     */
+    @Override
+    protected int getWidgetType() {
+        return Notes.TYPE_WIDGET_4X;
+    }
+}

src/main/res/color/primary_text_dark.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <item android:state_pressed="true" android:color="#88555555" />
+  <item android:state_selected="true" android:color="#ff999999" />
+  <item android:color="#ff000000" />
+</selector>

src/main/res/color/secondary_text_dark.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <item android:color="#50000000" />
+</selector>