diff --git a/src/model/Note.java b/src/model/Note.java
new file mode 100644
index 0000000..a0e070d
--- /dev/null
+++ b/src/model/Note.java
@@ -0,0 +1,268 @@
+/*
+ * 单个便签项
+* 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;//包名
+import android.content.ContentProviderOperation;//批量的更新、插入、删除数据
+import android.content.ContentProviderResult;//操作结果
+import android.content.ContentUris;//添加或者修改uri后面的ID
+import android.content.ContentValues;//存储基本数据类型的数据
+import android.content.Context;// 获取调用内容
+import android.content.OperationApplicationException;//操作数据容错
+import android.net.Uri;//Uri相关操作，标识唯一的资源
+import android.os.RemoteException;//异常处理
+import android.util.Log;//输出日志，比如说出错、警告等
+
+import net.micode.notes.data.Notes;//小米便签一些属性的操作
+import net.micode.notes.data.Notes.CallNote;//调用操作
+import net.micode.notes.data.Notes.DataColumns;//数据栏
+import net.micode.notes.data.Notes.NoteColumns;//笔记栏
+import net.micode.notes.data.Notes.TextNote;//操作区
+
+import java.util.ArrayList;//导入Java,util,ArrayList
+
+
+public class Note {//定义note类，处理单个便签
+    private ContentValues mNoteDiffValues;//声明一个ContentValues私有变量ContentValues，用来存储note与上次修改后的改动
+    private NoteData mNoteData;//声明一个私有变量NoteData，用来记录单个便签的基本信息
+    private static final String TAG = "Note";//设置软件标签
+    /**
+     * Create a new note id for adding a new note to databases
+     */
+    public static synchronized long getNewNoteId(Context context, long folderId) {
+    //Create a new note in the database
+    /*
+     *  作用：为新便签在数据库里边创建一个新的ID
+     *  实现：创建一个内容集合，存入创建便签的时间，最后修改的时间，再根据当前便签所处的上下文和文件夹的ID，从内容解析器中得到的路径uri里面
+     *       获取新的便签的ID。最后判断ID是否合法，然后返回
+     *  参数：@context：便签所处的上下文
+     *       @folderId：所处的便签文件夹ID
+     *       @return：新创建便签的ID
+     */
+        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;
+    }
+
+    public Note() {//定义两个变量用来存储便签的数据，一个是存储便签属性、一个是存储便签内容
+        mNoteDiffValues = new ContentValues();
+        mNoteData = new NoteData();
+    }
+
+    public void setNoteValue(String key, String value) {
+    	/*
+         *  作用：设置便签的属性
+         *  实现：通过传入key，指定修改便签的属性；传入value，指定修改的值，通过属性管理器mNoteDiffValues写入。最后，改变最后修改时间
+         *  参数：@key：要修改的属性
+         *       @value：要修改的值
+         */
+        mNoteDiffValues.put(key, value);
+        mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+        mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+    } 
+
+    public void setTextData(String key, String value) {//设置数据库表格的标签文本内容的数据
+        mNoteData.setTextData(key, value);
+    }
+
+    public void setTextDataId(long id) {//设置文本数据的ID
+        mNoteData.setTextDataId(id);
+    }
+
+    public long getTextDataId() {//获取文本数据的ID
+        return mNoteData.mTextDataId;
+    }
+
+    public void setCallDataId(long id) {//设置电话号码数据的ID
+        mNoteData.setCallDataId(id);
+    }
+
+    public void setCallData(String key, String value) {//设置电话号码的数据
+        mNoteData.setCallData(key, value);
+    }
+
+    public boolean isLocalModified() {//判断便签是否进行了本地修改
+        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
+    }
+
+    public boolean syncNote(Context context, long noteId) {//判断对修改过的便签是否进行同步
+        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;
+    }
+
+    private class NoteData {//定义一个基本的便签内容的数据类，主要包含文本数据和电话号码数据
+        private long mTextDataId;//文本数据id
+
+        private ContentValues mTextDataValues;//文本数据内容
+
+        private long mCallDataId;//电话号码数据ID
+
+        private ContentValues mCallDataValues;//电话号码数据内容
+
+        private static final String TAG = "NoteData";//默认构造函数
+
+        public NoteData() {//NoteData的构造函数，初始化四个变量
+            mTextDataValues = new ContentValues();
+            mCallDataValues = new ContentValues();
+            mTextDataId = 0;
+            mCallDataId = 0;
+        }
+
+        boolean isLocalModified() {//判断是否本地修改
+            return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
+        }
+
+        void setTextDataId(long id) {//设置文本数据的ID
+            if(id <= 0) {
+                throw new IllegalArgumentException("Text data id should larger than 0");
+            }
+            mTextDataId = id;
+        }
+
+        void setCallDataId(long id) {//设置电话号码对应的id
+            if (id <= 0) {
+                throw new IllegalArgumentException("Call data id should larger than 0");
+            }
+            mCallDataId = id;
+        }
+
+        void setCallData(String key, String value) {//设置电话号码数据内容，并且保存修改时间
+            mCallDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        void setTextData(String key, String value) {//设置文本数据
+            mTextDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        Uri pushIntoContentResolver(Context context, long noteId) {//使用uri将数据添加到数据库
+            /**
+             * Check for safety
+             */
+            if (noteId <= 0) {//判断数据是否合法
+                throw new IllegalArgumentException("Wrong note id:" + noteId);
+            }
+
+            ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+            ContentProviderOperation.Builder builder = null;
+
+            if(mTextDataValues.size() > 0) {//把文本数据存入DataColumns
+                mTextDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mTextDataId == 0) {//文本数据ID为零，意味着这个id是新建默认的id
+                    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) {//电话号码同步
+                mCallDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mCallDataId == 0) {//将电话号码的id设定为uri提供的id
+                    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 {//当电话号码不为新建时，更新电话号码ID
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mCallDataId));
+                    builder.withValues(mCallDataValues);
+                    operationList.add(builder.build());
+                }
+                mCallDataValues.clear();
+            }
+
+            if (operationList.size() > 0) {//存储过程中如果遇到异常，通过如下进行处理
+                try {//抛出远程异常，并写回日志
+                    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) {//捕捉操作异常并写回日志
+                    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()));//异常日志
+                    return null;
+                }
+            }
+            return null;
+        }
+    }
+}
diff --git a/src/model/WorkingNote.java b/src/model/WorkingNote.java
new file mode 100644
index 0000000..f78e8b0
--- /dev/null
+++ b/src/model/WorkingNote.java
@@ -0,0 +1,370 @@
+/*当前活动便签项
+ * 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;//在model包中
+
+import android.appwidget.AppWidgetManager;//需要调用的其他类
+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;
+
+
+public class WorkingNote {/*声明WorkingNote类,创建小米便签的主要类，
+    包括创建空便签，保存便签，加载小米便签内容，和设置小米便签的一些小部件之类的操作*/
+    // Note for the working note
+    private Note mNote;
+    // Note Id
+    private long mNoteId;
+    // Note content
+    private String mContent;
+    // Note mode
+    private int mMode;
+
+    private long mAlertDate;
+
+    private long mModifiedDate;
+
+    private int mBgColorId;
+
+    private int mWidgetId;
+
+    private int mWidgetType;
+
+    private long mFolderId;
+
+    private Context mContext;
+
+    private static final String TAG = "WorkingNote";
+
+    private boolean mIsDeleted;
+
+    private NoteSettingChangedListener mNoteSettingStatusListener;
+
+    public static final String[] DATA_PROJECTION = new String[] {/*声明NOTE_PROJECTION字符串数组，
+            用于存储数据信息。*/
+            DataColumns.ID,
+            DataColumns.CONTENT,
+            DataColumns.MIME_TYPE,
+            DataColumns.DATA1,
+            DataColumns.DATA2,
+            DataColumns.DATA3,
+            DataColumns.DATA4,
+    };
+
+    public static final String[] NOTE_PROJECTION = new String[] {//保存便签属性信息的string数组
+            NoteColumns.PARENT_ID,
+            NoteColumns.ALERTED_DATE,
+            NoteColumns.BG_COLOR_ID,
+            NoteColumns.WIDGET_ID,
+            NoteColumns.WIDGET_TYPE,
+            NoteColumns.MODIFIED_DATE
+    };
+
+    private static final int DATA_ID_COLUMN = 0;//以下定义的是上述两个列表中各元素的索引
+
+    private static final int DATA_CONTENT_COLUMN = 1;
+
+    private static final int DATA_MIME_TYPE_COLUMN = 2;
+
+    private static final int DATA_MODE_COLUMN = 3;
+
+    private static final int NOTE_PARENT_ID_COLUMN = 0;
+
+    private static final int NOTE_ALERTED_DATE_COLUMN = 1;
+
+    private static final int NOTE_BG_COLOR_ID_COLUMN = 2;
+
+    private static final int NOTE_WIDGET_ID_COLUMN = 3;
+
+    private static final int NOTE_WIDGET_TYPE_COLUMN = 4;
+
+    private static final int NOTE_MODIFIED_DATE_COLUMN = 5;
+
+    // New note construct
+    private WorkingNote(Context context, long folderId) {//初始化WorkingNote类的内部数据变量
+        mContext = context;
+        mAlertDate = 0;
+        mModifiedDate = System.currentTimeMillis();//获取系统当前时间的方法，返回当前时间
+        mFolderId = folderId;
+        mNote = new Note();//加载一个已存在的便签
+        mNoteId = 0;
+        mIsDeleted = false;
+        mMode = 0;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;//默认是不可见
+    }
+
+    // Existing note construct
+    private WorkingNote(Context context, long noteId, long folderId) {//载入便签
+        mContext = context;
+        mNoteId = noteId;
+        mFolderId = folderId;
+        mIsDeleted = false;
+        mNote = new Note();
+        loadNote();
+    }
+
+    private void loadNote() {//加载已有的便签
+        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();
+    }
+
+    private void loadNoteData() {//加载便签数据
+        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);
+        }
+    }
+
+    public static WorkingNote createEmptyNote(Context context, long folderId, int widgetId,
+            int widgetType, int defaultBgColorId) {//创建一个空便签
+        WorkingNote note = new WorkingNote(context, folderId);
+        note.setBgColorId(defaultBgColorId);
+        note.setWidgetId(widgetId);
+        note.setWidgetType(widgetType);
+        return note;
+    }
+
+    public static WorkingNote load(Context context, long id) {//加载已经创建的便签
+        return new WorkingNote(context, id, 0);
+    }
+
+    public synchronized boolean saveNote() {//保存便签，成功保存返回true，否则返回false
+        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;
+        }
+    }
+
+    public boolean existInDatabase() {//查看该note是否已经存放到数据库中
+        return mNoteId > 0;
+    }
+
+    private boolean isWorthSaving() {//判断是否需要保存
+        if (mIsDeleted || (!existInDatabase() && TextUtils.isEmpty(mContent))
+                || (existInDatabase() && !mNote.isLocalModified())) {
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    public void setOnSettingStatusChangedListener(NoteSettingChangedListener l) {//设置状态改变的监听器
+        mNoteSettingStatusListener = l;
+    }
+
+    public void setAlertDate(long date, boolean set) {//设置提醒日期
+        if (date != mAlertDate) {
+            mAlertDate = date;
+            mNote.setNoteValue(NoteColumns.ALERTED_DATE, String.valueOf(mAlertDate));
+        }
+        if (mNoteSettingStatusListener != null) {
+            mNoteSettingStatusListener.onClockAlertChanged(date, set);
+        }
+    }
+
+    public void markDeleted(boolean mark) {//设置删除标志
+        mIsDeleted = mark;
+        if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                && mWidgetType != Notes.TYPE_WIDGET_INVALIDE && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+        }
+    }
+
+    public void setBgColorId(int id) {//设定背景颜色
+        if (id != mBgColorId) {
+            mBgColorId = id;
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onBackgroundColorChanged();
+            }
+            mNote.setNoteValue(NoteColumns.BG_COLOR_ID, String.valueOf(id));
+        }
+    }
+
+    public void setCheckListMode(int mode) {//设置检查列表模式
+        if (mMode != mode) {
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onCheckListModeChanged(mMode, mode);
+            }
+            mMode = mode;
+            mNote.setTextData(TextNote.MODE, String.valueOf(mMode));
+        }
+    }
+
+    public void setWidgetType(int type) {//设置窗口类型
+        if (type != mWidgetType) {
+            mWidgetType = type;
+            mNote.setNoteValue(NoteColumns.WIDGET_TYPE, String.valueOf(mWidgetType));
+        }
+    }
+
+    public void setWidgetId(int id) {//设置窗口编号
+        if (id != mWidgetId) {
+            mWidgetId = id;
+            mNote.setNoteValue(NoteColumns.WIDGET_ID, String.valueOf(mWidgetId));
+        }
+    }
+
+    public void setWorkingText(String text) {//写入文本内容
+        if (!TextUtils.equals(mContent, text)) {
+            mContent = text;
+            mNote.setTextData(DataColumns.CONTENT, mContent);
+        }
+    }
+
+    public void convertToCallNote(String phoneNumber, long callDate) {//转换成电话提醒的便签
+        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));
+    }
+
+    public boolean hasClockAlert() {//检测是否有时钟提醒，mAlertDate > 0返回真，否则返回假
+        return (mAlertDate > 0 ? true : false);
+    }
+
+    public String getContent() {//获取便签内容
+        return mContent;
+    }
+
+    public long getAlertDate() {//获取提醒时间
+        return mAlertDate;
+    }
+
+    public long getModifiedDate() {//获取修改时间
+        return mModifiedDate;
+    }
+
+    public int getBgColorResId() {//获取背景颜色来源id
+        return NoteBgResources.getNoteBgResource(mBgColorId);
+    }
+
+    public int getBgColorId() {//获取背景颜色id
+        return mBgColorId;
+    }
+
+    public int getTitleBgResId() {//获取标题背景颜色资源的id
+        return NoteBgResources.getNoteTitleBgResource(mBgColorId);
+    }
+
+    public int getCheckListMode() {//获取清单模式
+        return mMode;
+    }
+
+    public long getNoteId() {//获取便签id
+        return mNoteId;
+    }
+
+    public long getFolderId() {//获取文件夹id
+        return mFolderId;
+    }
+
+    public int getWidgetId() {//获取窗口id
+        return mWidgetId;
+    }
+
+    public int getWidgetType() {//监听检测便签设置变化的接口
+        return mWidgetType;
+    }
+
+    public interface NoteSettingChangedListener {//监听便签设置是否改变
+        /**
+         * Called when the background color of current note has just changed
+         */
+        void onBackgroundColorChanged();//背景颜色改变
+
+        /**
+         * Called when user set clock
+         */
+        void onClockAlertChanged(long date, boolean set);//提醒时间按钮，可进行时间的更改和提醒的开关
+
+        /**
+         * Call when user create note from widget
+         */
+        void onWidgetChanged();//窗口改变
+
+        /**
+         * Call when switch between check list mode and normal mode
+         * @param oldMode is previous mode before change
+         * @param newMode is new mode
+         */
+        void onCheckListModeChanged(int oldMode, int newMode);//便签检查列表模式改变
+    }
+}
diff --git a/src/ui/NotesListAdapter.java b/src/ui/NotesListAdapter.java
new file mode 100644
index 0000000..fea3146
--- /dev/null
+++ b/src/ui/NotesListAdapter.java
@@ -0,0 +1,184 @@
+/*
+ * 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;//引入tools包
+
+import android.content.Context;//导入各种类
+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;
+
+
+public class NotesListAdapter extends CursorAdapter {//继承自CursorAdapter，它为cursor和ListView提供了连接的桥梁。因此，该类为cursor和便签编辑提供了沟通渠道
+    private static final String TAG = "NotesListAdapter";
+    private Context mContext;
+    private HashMap<Integer, Boolean> mSelectedIndex;
+    private int mNotesCount;
+    private boolean mChoiceMode;
+
+    public static class AppWidgetAttribute {//表示桌面widget的属性，包括编号和类型
+        public int widgetId;
+        public int widgetType;
+    };
+
+    public NotesListAdapter(Context context) {//初始化便签链接
+        super(context, null);
+        mSelectedIndex = new HashMap<Integer, Boolean>();
+        mContext = context;
+        mNotesCount = 0;
+    }
+
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {//利用NotesListLtem类创建新布局
+        return new NotesListItem(context);
+    }
+
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {//将光标指向的数据与创建的视图捆绑起来
+        if (view instanceof NotesListItem) {
+            NoteItemData itemData = new NoteItemData(context, cursor);
+            ((NotesListItem) view).bind(context, itemData, mChoiceMode,
+                    isSelectedItem(cursor.getPosition()));
+        }
+    }
+
+    public void setCheckedItem(final int position, final boolean checked) {//设置勾选框
+        mSelectedIndex.put(position, checked);
+        notifyDataSetChanged();
+    }
+
+    public boolean isInChoiceMode() {//判断是否被勾选
+        return mChoiceMode;
+    }
+
+    public void setChoiceMode(boolean mode) {//重置勾选框
+        mSelectedIndex.clear();
+        mChoiceMode = mode;
+    }
+
+    public void selectAll(boolean checked) {//设置全部勾选
+        Cursor cursor = getCursor();
+        for (int i = 0; i < getCount(); i++) {
+            if (cursor.moveToPosition(i)) {
+                if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) {
+                    setCheckedItem(i, checked);
+                }
+            }
+        }
+    }
+
+    public HashSet<Long> getSelectedItemIds() {// 获取已经被勾选的项目的id号加入到散列表itemSet中
+        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;
+    }
+
+    public HashSet<AppWidgetAttribute> getSelectedWidget() {//获取桌面组件选项表
+        HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
+        for (Integer position : mSelectedIndex.keySet()) {//遍历被选中的列表
+            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");//设置标签，非法的cursor
+                    return null;
+                }
+            }
+        }
+        return itemSet;
+    }
+
+    public int getSelectedCount() {//获取选项个数
+        Collection<Boolean> values = mSelectedIndex.values();//获取选项下标的值
+        if (null == values) {
+            return 0;
+        }
+        Iterator<Boolean> iter = values.iterator();//初始化叠加器
+        int count = 0;
+        while (iter.hasNext()) {
+            if (true == iter.next()) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    public boolean isAllSelected() {//判断是否全选
+        int checkedCount = getSelectedCount();
+        return (checkedCount != 0 && checkedCount == mNotesCount);
+    }
+
+    public boolean isSelectedItem(final int position) {//判断是否为选项表
+        if (null == mSelectedIndex.get(position)) {
+            return false;
+        }
+        return mSelectedIndex.get(position);
+    }
+
+    @Override
+    protected void onContentChanged() {//在activity发生变化时，重新计算便签数量
+        super.onContentChanged();
+        calcNotesCount();
+    }
+
+    @Override
+    public void changeCursor(Cursor cursor) {//光标变动时重新计算便签数量
+        super.changeCursor(cursor);
+        calcNotesCount();
+    }
+
+    private void calcNotesCount() {//计算当前界面便签的数量
+        mNotesCount = 0;
+        for (int i = 0; i < getCount(); i++) {//遍历所有数据
+            Cursor c = (Cursor) getItem(i);
+            if (c != null) {//判断语句，如果光标不是null，那么便得到信息，便签数目加1
+                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) {//若选项的数据类型为便签类型，那么计数+1
+                    mNotesCount++;
+                }
+            } else {//设置为无效的光标
+                Log.e(TAG, "Invalid cursor");
+                return;
+            }
+        }
+    }
+}