吴友政

吴友政/tool/BackupUtils.java

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+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)  打开网站的操作
+ *
+ * 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;//定义小米便签 功能类
+
+import android.content.Context;//导入各种需要的类
+import android.database.Cursor;//查询数据类型
+import android.os.Environment;//导入安卓环境包
+import android.text.TextUtils;//导入安卓文本功能包
+import android.text.format.DateFormat;//用于转化日期格式
+import android.util.Log;//打印与查看日志
+
+import net.micode.notes.R;//从项目的其他软件包中调用类
+import net.micode.notes.data.Notes;//数据便签类
+import net.micode.notes.data.Notes.DataColumns;//数据类型类
+import net.micode.notes.data.Notes.DataConstants;//常数类
+import net.micode.notes.data.Notes.NoteColumns;//便签类
+
+import java.io.File;//引入文件操作类
+import java.io.FileNotFoundException;//文件未找到的错误处理
+import java.io.FileOutputStream;//文件的输入
+import java.io.IOException;//操作错误处理
+import java.io.PrintStream;//导入需要的包
+
+
+public class BackupUtils {//此处为备份工具包
+    private static final String TAG = "BackupUtils";//实化一个BackupUtils的对象
+    // Singleton stuff
+    private static BackupUtils sInstance;//初始化sInstance
+
+    public static synchronized BackupUtils getInstance(Context context) {//如果当前备份不在，则再新声明一个
+        if (sInstance == null) {
+            sInstance = new BackupUtils(context);
+        }
+        return sInstance;//返回当前的sInstance值
+    }
+
+    /**
+     * Following states are signs to represents backup or restore
+     * status
+     */
+    // Currently, the sdcard is not mounted
+    public static final int STATE_SD_CARD_UNMOUONTED           = 0;//备份文件夹不存在
+    // The backup file not exist
+    public static final int STATE_BACKUP_FILE_NOT_EXIST        = 1;//变量表示备份的文件不存在
+    // The data is not well formated, may be changed by other programs
+    public static final int STATE_DATA_DESTROIED               = 2;//超时异常
+    // Some run-time exception which causes restore or backup fails
+    public static final int STATE_SYSTEM_ERROR                 = 3;//系统错误状态为3
+    // Backup or restore success
+    public static final int STATE_SUCCESS                      = 4;//变量表示备份成功
+
+    private TextExport mTextExport;//实例化一个为mTextExport的对象
+
+    private BackupUtils(Context context) {//初始化构造函数
+        mTextExport = new TextExport(context);
+    }
+
+    private static boolean externalStorageAvailable() {//判断外部存储设备是否有效
+        return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
+    }
+
+    public int exportToText() {//输出至文本
+        return mTextExport.exportToText();
+    }
+
+    public String getExportedTextFileName() {//返回获取的文件名
+        return mTextExport.mFileName;
+    }
+
+    public String getExportedTextFileDir() {//返回文件的目录
+        return mTextExport.mFileDirectory;
+    }
+
+    private static class TextExport {//内部类：文本输出
+        private static final String[] NOTE_PROJECTION = {//定义了一个数组存储便签的信息
+                NoteColumns.ID,//ID
+                NoteColumns.MODIFIED_DATE,//日期
+                NoteColumns.SNIPPET,
+                NoteColumns.TYPE
+        };
+
+        private static final int NOTE_COLUMN_ID = 0;//初始化便签ID
+
+        private static final int NOTE_COLUMN_MODIFIED_DATE = 1;//初始化修改时间
+
+        private static final int NOTE_COLUMN_SNIPPET = 2;//初始化小段消息状态
+
+        private static final String[] DATA_PROJECTION = {//定义字符串存储函数的基本信息
+                DataColumns.CONTENT,
+                DataColumns.MIME_TYPE,
+                DataColumns.DATA1,
+                DataColumns.DATA2,
+                DataColumns.DATA3,
+                DataColumns.DATA4,
+        };
+
+        private static final int DATA_COLUMN_CONTENT = 0;//表示设定：数据内容表示为0
+
+        private static final int DATA_COLUMN_MIME_TYPE = 1;//数据媒体类型标识为1
+
+        private static final int DATA_COLUMN_CALL_DATE = 2;//访问日期表示为2
+
+        private static final int DATA_COLUMN_PHONE_NUMBER = 4;//电话号码表示为4
+
+        private final String [] TEXT_FORMAT;//文档格式标识
+        private static final int FORMAT_FOLDER_NAME          = 0;//文件命名格式表示为0
+        private static final int FORMAT_NOTE_DATE            = 1;//便签日期格式表示为1
+        private static final int FORMAT_NOTE_CONTENT         = 2;//便签目录格式
+
+        private Context mContext;//定义上下文类
+        private String mFileName;//定义文件名
+        private String mFileDirectory;//文件路径
+
+        public TextExport(Context context) {//从context类实例中花去信息，给对应的属性赋初始值
+            TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
+            mContext = context;
+            mFileName = "";
+            mFileDirectory = "";
+        }
+
+        private String getFormat(int id) {
+            return TEXT_FORMAT[id];
+        }//获取文本组成部分
+
+        /**
+         * Export the folder identified by folder id to text
+         */
+        private void exportFolderToText(String folderId, PrintStream ps) {//通过文件夹目录ID将目录导出后成为文件
+            // 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();//关闭游标
+            }
+        }
+
+        /**
+         * Export note identified by id to a print stream
+         */
+        private void exportNoteToText(String noteId, PrintStream ps) {//函数：将便签的内容以文本的形式显示在屏幕上
+            Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI,//利用光标来扫描内容
+                    DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
+                            noteId
+                    }, null);
+
+            if (dataCursor != null) {//如果光标不为空
+                if (dataCursor.moveToFirst()) {//游标已经在第一步就位
+                    do {
+                        String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);//获取便签媒体类型
+                        if (DataConstants.CALL_NOTE.equals(mimeType)) {//判断便签的内容
+                            // Print phone number
+                            String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);//获取电话号码
+                            long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);//获取通话时间
+                            String location = dataCursor.getString(DATA_COLUMN_CONTENT);//获取地址
+
+                            if (!TextUtils.isEmpty(phoneNumber)) {//判断是否为空字符
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        phoneNumber));
+                            }
+                            // Print call date
+                            ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat//输出电话号码
+                                    .format(mContext.getString(R.string.format_datetime_mdhm),
+                                            callDate)));
+                            // Print call attachment location
+                            if (!TextUtils.isEmpty(location)) {//输出位置location
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        location));
+                            }
+                        } else if (DataConstants.NOTE.equals(mimeType)) {//如果便签的内容存在，则直接输出
+                            String content = dataCursor.getString(DATA_COLUMN_CONTENT);
+                            if (!TextUtils.isEmpty(content)) {//如果便签内容不为空
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        content));
+                            }
+                        }
+                    } while (dataCursor.moveToNext());//光标下移
+                }
+                dataCursor.close();//关闭光标
+            }
+            // print a line separator between note
+            try {//正常情况再note下面输出一条线
+                ps.write(new byte[] {
+                        Character.LINE_SEPARATOR, Character.LETTER_NUMBER
+                });
+            } catch (IOException e) {//获取错误信息
+                Log.e(TAG, e.toString());
+            }
+        }
+
+        /**
+         * Note will be exported as text which is user readable
+         */
+        public int exportToText() {//以TEXT形式输出到外部设备
+            if (!externalStorageAvailable()) {//如果外部设备未安装好，返回对应状态
+                Log.d(TAG, "Media was not mounted");
+                return STATE_SD_CARD_UNMOUONTED;
+            }
+
+            PrintStream ps = getExportToTextPrintStream();//获取存储信息
+            if (ps == null) {//如果没有得到正常的数据流，则输出错误信息
+                Log.e(TAG, "get print stream error");
+                return STATE_SYSTEM_ERROR;
+            }
+            // First export folder and its notes
+            Cursor folderCursor = mContext.getContentResolver().query(//定位需要导出的文件夹
+                    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) {//如果文件夹不为空，即存在文件夹
+                if (folderCursor.moveToFirst()) {//文件光标再第一行就位
+                    do {
+                        // Print folder's name
+                        String folderName = "";
+                        if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {//找到文件名
+                            folderName = mContext.getString(R.string.call_record_folder_name);
+                        } else {
+                            folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);//取便签为便签名字
+                        }
+                        if (!TextUtils.isEmpty(folderName)) {//判断folderName是否存在
+                            ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
+                        }
+                        String folderId = folderCursor.getString(NOTE_COLUMN_ID);//通过便签ID获得folderID
+                        exportFolderToText(folderId, ps);
+                    } while (folderCursor.moveToNext());//文件夹的光标下移
+                }
+                folderCursor.close();//关闭光标
+            }
+
+            // Export notes in root's folder
+            Cursor noteCursor = mContext.getContentResolver().query(//输出根目录下面的笔记
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
+                            + "=0", null, null);
+
+            if (noteCursor != null) {//如果笔记游标不为空
+                if (noteCursor.moveToFirst()) {//便签光标下移
+                    do {
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(//输出修改日期
+                                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);//找到这块数据的ID
+                        exportNoteToText(noteId, ps);
+                    } while (noteCursor.moveToNext());//便签光标下移
+                }
+                noteCursor.close();//关闭游标
+            }
+            ps.close();
+
+            return STATE_SUCCESS; //返回成功导出状态
+        }
+
+        /**
+         * Get a print stream pointed to the file {@generateExportedTextFile}
+         */
+        private PrintStream getExportToTextPrintStream() {//获取指向文件的打印流
+            File file = generateFileMountedOnSDcard(mContext, R.string.file_path,//创建文件
+                    R.string.file_name_txt_format);
+            if (file == null) {//如果文件夹为空，则创建失败
+                Log.e(TAG, "create file to exported failed");
+                return null;
+            }
+            mFileName = file.getName();//得到文件名
+            mFileDirectory = mContext.getString(R.string.file_path);//获取文件路径
+            PrintStream ps = null;//初始化ps
+            try {//将ps输出流输出到特定的文件，目的是导出文件
+                FileOutputStream fos = new FileOutputStream(file);
+                ps = new PrintStream(fos);
+            } catch (FileNotFoundException e) {//给出错误信息
+                e.printStackTrace();
+                return null;
+            } catch (NullPointerException e) {//捕获空指针异常
+                e.printStackTrace();
+                return null;
+            }
+            return ps;
+        }
+    }
+
+    /**
+     * Generate the text file to store imported data
+     */
+    private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
+        //产生用于存储输入信息的文件
+        StringBuilder sb = new StringBuilder();//构建一个动态字符串将外部信息加入其中
+        sb.append(Environment.getExternalStorageDirectory());//加入路径
+        sb.append(context.getString(filePathResId));//文件的存储路径
+        File filedir = new File(sb.toString());//存储路径信息
+        sb.append(context.getString(//格式化输出当前系统时间
+                fileNameFormatResId,
+                DateFormat.format(context.getString(R.string.format_date_ymd),//将当前的系统时间以预定的格式输出
+                        System.currentTimeMillis())));
+        File file = new File(sb.toString());//将输出连接到一个文件里
+
+        try {
+            if (!filedir.exists()) {//如果文件不存在，则重建
+                filedir.mkdir();
+            }
+            if (!file.exists()) {
+                file.createNewFile();
+            }
+            return file;//返回导出的文件
+        } catch (SecurityException e) {//处理碰到的异常
+            e.printStackTrace();
+        } catch (IOException e) {//捕获异常
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+}

吴友政/tool/DataUtils.java

@@ -0,0 +1,307 @@
+/*
+ * 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;
+
+
+public class DataUtils {//数据的集成工具类
+    public static final String TAG = "DataUtils";
+    public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {
+        //方法：实现了批量删除便签
+        if (ids == null) {//判断笔记id是否为空
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+        if (ids.size() == 0) {//判断笔记大小是否为空
+            Log.d(TAG, "no id is in the hashset");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();//提供一个事件的列表
+        for (long id : ids) {//遍历数据，如果此数据为根目录则跳过此数据不删除，如果不是根目录则将此数据删除
+            if(id == Notes.ID_ROOT_FOLDER) {
+                Log.e(TAG, "Don't delete system folder root");
+                continue;
+            }
+            ContentProviderOperation.Builder builder = ContentProviderOperation//使用newdelete进行删除
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            operationList.add(builder.build());
+        }
+        try {//这是一个错误处理机制，并分别针对两种不同的错误进行处理。
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                //数据库事项，由一系列的数据库操作序列构成，这个事项作为一个整体来处理
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {//对错误进行处理，并将错误存储到日志当中
+            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;
+    }
+
+    public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) {
+        //将标签移动到另一个目录下
+        ContentValues values = new ContentValues();//实例化一个contentValues类
+        values.put(NoteColumns.PARENT_ID, desFolderId);//将PARENT_ID更改为目标目录ID
+        values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);//设置origin也即原本的父节点为原本的文件夹的id
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);//设置修改符号为1
+        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);
+        //对需要移动的便签进行数据更新，然后用update实现
+    }
+
+    public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
+            long folderId) {//批量的将标签移动到另一个目录下
+        if (ids == null) {//判断便签ID是否为空
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        //将ids里包含的每一列的数据逐次加入到operationList中，等待最后的批量处理
+        for (long id : ids) {//遍历所有选中的便签的id
+            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());//将ids里的数据添加到operationlist中以便接下来批量处理
+        }
+
+        try {//利用Log输出信息来进行错误检测
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            //applyBatch一次性处理一个操作列表
+            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) {//异常处理
+            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;
+    }
+
+    /**
+     * Get the all folder count except system folders {@link Notes#TYPE_SYSTEM}}
+     */
+    public static int getUserFolderCount(ContentResolver resolver) {//获取用户文件夹数
+        Cursor cursor =resolver.query(Notes.CONTENT_NOTE_URI,
+                //resolver.query()方法第二个参数是要返回的列，第三个参数是Section，查询where字句；第四个是查询条件属性值，第五个是筛选规则
+                new String[] { "COUNT(*)" },
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
+                null);//String.valueof将形参转成字符串返回
+
+        int count = 0;
+        if(cursor != null) {//尝试得到用户文件夹的数量
+            if(cursor.moveToFirst()) {
+                try {//异常处理
+                    count = cursor.getInt(0);
+                } catch (IndexOutOfBoundsException e) {//索引序号超出界限
+                    Log.e(TAG, "get folder count failed:" + e.toString());
+                } finally {
+                    cursor.close();//关闭游标
+                }
+            }
+        }
+        return count;
+    }
+
+    public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {//是否在便签数据库中可见
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),//通过withappendedid的方法为uri加上id
+                null,
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
+                new String [] {String.valueOf(type)},
+                null);//sql语句，表示筛选出列中type等于string数组中type，且每一项的PARENT_ID不等于Notes.ID.TRAXH_FOLDER
+
+        boolean exist = false;//查询文件
+        if (cursor != null) {//用getcount函数判断cursor是否为空
+            if (cursor.getCount() > 0) {//如果有满足条件的条目，那么就是可见，exist为真，否则不可见，exist为假
+                exist = true;
+            }
+            cursor.close();//关闭游标
+        }
+        return exist;//在数据数据库中是否存在
+    }
+
+    public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) {//判断该note是否在数据库中存在
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null, null, null, null);
+//相比于上面，这个只是存在性判定，因此不需要过多筛选条件
+        boolean exist = false;//初始化存在状态
+        if (cursor != null) {//根据getcount此时的值可以判断dataID的存在性
+            if (cursor.getCount() > 0) {//根据筛选出来的条数判断存在性
+                exist = true;
+            }
+            cursor.close();//关闭游标
+        }
+        return exist;
+    }
+
+    public static boolean existInDataDatabase(ContentResolver resolver, long dataId) {//检查文件名字是否可见
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
+                //通过URI与dataId在数据库中查找数据
+                null, null, null, null);
+
+        boolean exist = false;//根据数据的有无返回相应的布尔值
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {//调用对应的uri的数据值进行查询
+                exist = true;
+            }
+            cursor.close();//关闭游标
+        }
+        return exist;//通过名字查询文件是否存在
+    }
+
+    public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
+        //这个则是判断某个文件夹名字是否对应一个未被删除的文件夹
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null,//筛选类型正确的、未被删除的和名字对应得上的
+                NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER +
+                " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
+                " AND " + NoteColumns.SNIPPET + "=?",
+                new String[] { name }, null);//通过名字查询文件是否存在
+        boolean exist = false;
+        if(cursor != null) {//判断找到的文件名返回文件是否存在的bool值
+            if(cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();//关闭游标
+        }
+        return exist;
+    }
+
+    public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
+        //使用hashset来存储不同窗口的id和type并且建立对应关系
+        Cursor c = resolver.query(Notes.CONTENT_NOTE_URI,//父id为传入的文件夹id
+                new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
+                NoteColumns.PARENT_ID + "=?",
+                new String[] { String.valueOf(folderId) },//hash集合为空的情况
+                null);
+
+        HashSet<AppWidgetAttribute> set = null;//根据窗口的记录一一添加对应的属性值
+        if (c != null) {//将app窗口的属性加入到HashSet中
+            if (c.moveToFirst()) {
+                set = new HashSet<AppWidgetAttribute>();
+                do {
+                    try {//把每一个条目对应的窗口id和type记录下来，放到set里面。每一行的第0个int和第1个int分别对应widgetId和widgetType
+                        AppWidgetAttribute widget = new AppWidgetAttribute();//新建一个区块
+                        widget.widgetId = c.getInt(0);//0对应的NoteColumns.WIDGET_ID
+                        widget.widgetType = c.getInt(1);//1对应的NoteColumns.WIDGET_TYPE
+                        set.add(widget);
+                    } catch (IndexOutOfBoundsException e) {//当下标超过边界，那么返回错误
+                        Log.e(TAG, e.toString());
+                    }
+                } while (c.moveToNext());//访问下一条
+            }
+            c.close();//关闭游标
+        }
+        return set;
+    }
+
+    public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {//通过笔记ID获取号码
+        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 },//新建字符列表
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {// 获取电话号码，并处理异常。
+            try {//返回电话号码
+                return cursor.getString(0);
+            } catch (IndexOutOfBoundsException e) {//捕获字符
+                Log.e(TAG, "Get call number fails " + e.toString());
+            } finally {
+                cursor.close();
+            }
+        }
+        return "";
+    }
+
+    public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
+        //同样的，通过映射关系，通过号码和日期获取ID
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,//通过数据库操作，查询条件是（callDate和phoneNumber匹配传入参数的值）
+                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);//通过数据库操作，查询条件（callDate和phoneNumber匹配传入参数的值），找到对应的note
+
+        if (cursor != null) {//得到该note的系统属性，并以Long值的形式来保存
+            if (cursor.moveToFirst()) {
+                try {
+                    return cursor.getLong(0);//0对应的CallNote.NOTE_ID
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "Get call note id fails " + e.toString());
+                }
+            }
+            cursor.close();//关闭游标
+        }
+        return 0;
+    }
+
+    public static String getSnippetById(ContentResolver resolver, long noteId) {//按ID获取片段
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,//通过ID查询
+                new String [] { NoteColumns.SNIPPET },
+                NoteColumns.ID + "=?",
+                new String [] { String.valueOf(noteId)},
+                null);//通过数据库操作，查询条件是（callDate和phoneNumber匹配传入参数的值
+
+        if (cursor != null) {//以string的形式获取该对象当前行指定列的值。
+            String snippet = "";//对字符串进行格式处理，将字符串两头的空格去掉同时将换行符去掉
+            if (cursor.moveToFirst()) {
+                snippet = cursor.getString(0);
+            }
+            cursor.close();
+            return snippet;
+        }
+        throw new IllegalArgumentException("Note is not found with id: " + noteId);
+        //IllegalArgumentException是非法传参异常，也就是参数传的类型冲突，属于RunTimeException运行时异常
+    }
+
+    public static String getFormattedSnippet(String snippet) {//对字符串进行格式处理，将字符串两头的空格去掉，同时将换行符去掉
+        if (snippet != null) {
+            snippet = snippet.trim();// trim()函数: 移除字符串两侧的空白字符或其他预定义字符
+            int index = snippet.indexOf('\n');
+            if (index != -1) {
+                snippet = snippet.substring(0, index);//截取到第一个换行符
+            }
+        }
+        return snippet;
+    }
+}

吴友政/tool/GTaskStringUtils.java

@@ -0,0 +1,113 @@
+/*
+ * 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;//定义了很多的静态字符串，目的就是为了提供jsonObject中相应字符串的"key"
+
+public class GTaskStringUtils {
+
+    public final static String GTASK_JSON_ACTION_ID = "action_id";//行动ID
+
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";//任务列表
+
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";//任务类型
+
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";//新建
+
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";//移动
+
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";//更新
+
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";//id
+
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";//子实体
+
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";//客户端
+
+    public final static String GTASK_JSON_COMPLETED = "completed";
+
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";//当前列表位置
+
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";//失败
+
+    public final static String GTASK_JSON_DELETED = "deleted";//删除
+
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+
+    public final static String GTASK_JSON_ID = "id";
+
+    public final static String GTASK_JSON_INDEX = "index";//索引
+
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+
+    public final static String GTASK_JSON_LISTS = "lists";
+
+    public final static String GTASK_JSON_NAME = "name";
+
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+
+    public final static String GTASK_JSON_NOTES = "notes";
+
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";//搭档ID
+
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+
+    public final static String GTASK_JSON_RESULTS = "results";
+
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+
+    public final static String GTASK_JSON_TASKS = "tasks";//任务栏
+
+    public final static String GTASK_JSON_TYPE = "type";
+
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";//任务
+
+    public final static String GTASK_JSON_USER = "user";
+
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+
+    public final static String FOLDER_DEFAULT = "Default";
+
+    public final static String FOLDER_CALL_NOTE = "Call_Note";//呼叫小米便签
+
+    public final static String FOLDER_META = "METADATA";
+
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+
+    public final static String META_HEAD_NOTE = "meta_note";
+
+    public final static String META_HEAD_DATA = "meta_data";//数据
+
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+
+}

吴友政/tool/ResourceParser.java

@@ -0,0 +1,181 @@
+/*
+ * 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;
+
+public class ResourceParser {//ResourceParser类获取程序资源，如图片颜色等
+
+    public static final int YELLOW           = 0;//为颜色常量和字体常量赋值，为字体默认大小赋值
+    public static final int BLUE             = 1;
+    public static final int WHITE            = 2;
+    public static final int GREEN            = 3;
+    public static final int RED              = 4;
+
+    public static final int BG_DEFAULT_COLOR = YELLOW;//默认背景颜色（黄）
+
+    public static final int TEXT_SMALL       = 0;//为颜色常量和字体常量赋值，为字体默认大小赋值
+    public static final int TEXT_MEDIUM      = 1;
+    public static final int TEXT_LARGE       = 2;
+    public static final int TEXT_SUPER       = 3;
+
+    public static final int BG_DEFAULT_FONT_SIZE = TEXT_MEDIUM;//默认字体大小（中）
+
+    public static class NoteBgResources {// Note的背景颜色
+        private final static int [] BG_EDIT_RESOURCES = new int [] {//.调用drawable中的五种颜色的背景图片png文件
+            R.drawable.edit_yellow,//调用drawable中的五种颜色的标题背景图片png文件
+            R.drawable.edit_blue,
+            R.drawable.edit_white,
+            R.drawable.edit_green,
+            R.drawable.edit_red
+        };
+
+        private final static int [] BG_EDIT_TITLE_RESOURCES = new int [] {//背景标题的资源常量数组
+            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
+        };
+
+        public static int getNoteBgResource(int id) {
+            return BG_EDIT_RESOURCES[id];
+        }//获取便签背景资源id
+
+        public static int getNoteTitleBgResource(int id) {
+            return BG_EDIT_TITLE_RESOURCES[id];
+        }
+    }//获取标题使用的资源的ID
+
+    public static int getDefaultBgId(Context context) {//获取默认背景颜色对应Id
+        if (PreferenceManager.getDefaultSharedPreferences(context).getBoolean(//如果颜色设定为随机的颜色，那么就随机返回一个颜色
+                NotesPreferenceActivity.PREFERENCE_SET_BG_COLOR_KEY, false)) {
+            return (int) (Math.random() * NoteBgResources.BG_EDIT_RESOURCES.length);
+        } else {
+            return BG_DEFAULT_COLOR;//否则返回默认背景颜色
+        }
+    }
+
+    public static class NoteItemBgResources {//便签项目背景资源子类，包括方法：获得首尾项目等背景资源
+        private final static int [] BG_FIRST_RESOURCES = new int [] {//不同drawable的变量声明
+            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
+        };
+
+        private final static int [] BG_NORMAL_RESOURCES = new int [] {//定义了背景的默认资源
+            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
+        };
+
+        private final static int [] BG_LAST_RESOURCES = new int [] {//定义背景的下方资源
+            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,
+        };
+
+        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
+        };
+
+        public static int getNoteBgFirstRes(int id) {
+            return BG_FIRST_RESOURCES[id];
+        }//通过ID获取所需要的资源
+
+        public static int getNoteBgLastRes(int id) {
+            return BG_LAST_RESOURCES[id];
+        }//通过ID寻找last的颜色值
+
+        public static int getNoteBgSingleRes(int id) {
+            return BG_SINGLE_RESOURCES[id];
+        }//通过ID获取单个便签背景颜色资源
+
+        public static int getNoteBgNormalRes(int id) {
+            return BG_NORMAL_RESOURCES[id];
+        }//通过ID寻找normal的颜色值
+
+        public static int getFolderBgRes() {
+            return R.drawable.list_folder;
+        }//设置窗口的资源
+    }
+
+    public static class WidgetBgResources {//小窗口情况下的背景资源类
+        private final static int [] BG_2X_RESOURCES = new int [] {//2x小窗口背景资源初始化
+            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,
+        };
+
+        public static int getWidget2xBgResource(int id) {
+            return BG_2X_RESOURCES[id];
+        }//根据ID加载BG_2X_RESOURCES数组里的颜色资源序号。
+
+        private final static int [] BG_4X_RESOURCES = new int [] {//本条与下一条private定义与上两条相同，只不过由2倍扩大成了4倍
+            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
+        };
+
+        public static int getWidget4xBgResource(int id) {
+            return BG_4X_RESOURCES[id];
+        }//根据ID加载BG_4X_RESOURCES数组里的颜色资源序号。
+    }
+
+    public static class TextAppearanceResources {//文本外观资源，包括默认字体，以及获取资源大小
+        private final static int [] TEXTAPPEARANCE_RESOURCES = new int [] {//定义外观资源
+            R.style.TextAppearanceNormal,//通过ID找到格式，没有要求的话就设置为默认格式
+            R.style.TextAppearanceMedium,
+            R.style.TextAppearanceLarge,
+            R.style.TextAppearanceSuper
+        };
+
+        public static int getTexAppearanceResource(int id) {//这是一个容错的函数，防止输入的id大于资源总量。如果大于资源总量，则自动返回默认的设置结果
+            /**
+             * 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) {//若输入id大于字体编号最大值，则返回默认值
+                return BG_DEFAULT_FONT_SIZE;
+            }
+            return TEXTAPPEARANCE_RESOURCES[id];
+        }
+
+        public static int getResourcesSize() {
+            return TEXTAPPEARANCE_RESOURCES.length;
+        }//直接返回为资源的长度
+    }
+}