李秋锦注释提交

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

@@ -28,23 +28,27 @@ import java.util.HashMap;
 public class Contact {
     private static HashMap<String, String> sContactCache;
     private static final String TAG = "Contact";
-
+    // 查询匹配拨号者 ID 的选择条件
-    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
+    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER  //使用了PHONE_NUMBERS_EQUAL,用于比较电话号码是否相等
     + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
     + " AND " + Data.RAW_CONTACT_ID + " IN "
             + "(SELECT raw_contact_id "
             + " FROM phone_lookup"
             + " WHERE min_match = '+')";
 
+    // 获取联系人
     public static String getContact(Context context, String phoneNumber) {
+        // 如果联系人缓存为空，则初始化为一个新的HashMap
         if(sContactCache == null) {
             sContactCache = new HashMap<String, String>();
         }
 
+        // 如果联系人缓存中已经包含了该电话号码，则直接返回对应的联系人名字
         if(sContactCache.containsKey(phoneNumber)) {
             return sContactCache.get(phoneNumber);
         }
 
+        // 构建查询语句，用于查询与电话号码匹配的联系人信息
         String selection = CALLER_ID_SELECTION.replace("+",
                 PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
         Cursor cursor = context.getContentResolver().query(
@@ -54,18 +58,23 @@ public class Contact {
                 new String[] { phoneNumber },
                 null);
 
+        // 如果查询结果不为空且移动到第一条记录成功，则尝试获取联系人名字
         if (cursor != null && cursor.moveToFirst()) {
             try {
                 String name = cursor.getString(0);
+                // 将电话号码及其对应的联系人名字存入联系人缓存中
                 sContactCache.put(phoneNumber, name);
                 return name;
             } catch (IndexOutOfBoundsException e) {
+                // 捕获索引越界异常，并记录错误日志
                 Log.e(TAG, " Cursor get string error " + e.toString());
                 return null;
             } finally {
+                // 关闭游标
                 cursor.close();
             }
         } else {
+            // 如果查询结果为空，则打印日志表示未找到匹配的联系人信息
             Log.d(TAG, "No contact matched with number:" + phoneNumber);
             return null;
         }

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

@@ -286,14 +286,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
         db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
     }
-
+//静态同步方法，用于获取数据库帮助类的实例
     static synchronized NotesDatabaseHelper getInstance(Context context) {
         if (mInstance == null) {
             mInstance = new NotesDatabaseHelper(context);
         }
         return mInstance;
     }
-
+//用于创建笔记表和数据表。
     @Override
     public void onCreate(SQLiteDatabase db) {
         createNoteTable(db);
@@ -302,60 +302,60 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
 
     @Override
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-        boolean reCreateTriggers = false;
+        boolean reCreateTriggers = false; // 是否重新创建触发器的标志位
-        boolean skipV2 = false;
+        boolean skipV2 = false;           //是否跳过版本2的标志位
 
-        if (oldVersion == 1) {
+        if (oldVersion == 1) {  // 如果旧版本为1
-            upgradeToV2(db);
+            upgradeToV2(db);    // 升级到版本2
-            skipV2 = true; // this upgrade including the upgrade from v2 to v3
+            skipV2 = true;     //设置跳过版本2的标志为true
-            oldVersion++;
+            oldVersion++;      // 将旧版本号增加到2
         }
 
-        if (oldVersion == 2 && !skipV2) {
+        if (oldVersion == 2 && !skipV2) {    // 如果旧版本为2且未跳过版本2
-            upgradeToV3(db);
+            upgradeToV3(db);              // 升级到版本3
-            reCreateTriggers = true;
+            reCreateTriggers = true;     // 设置重新创建触发器的标志为true
-            oldVersion++;
+            oldVersion++;                // 将旧版本号增加到3
         }
 
-        if (oldVersion == 3) {
+        if (oldVersion == 3) {      // 如果旧版本为3
-            upgradeToV4(db);
+            upgradeToV4(db);       // 升级到版本4
-            oldVersion++;
+            oldVersion++;     // 将旧版本号增加到4
         }
 
-        if (reCreateTriggers) {
+        if (reCreateTriggers) {   // 如果需要重新创建触发器
-            reCreateNoteTableTriggers(db);
+            reCreateNoteTableTriggers(db);  // 重新创建笔记表的触发器
-            reCreateDataTableTriggers(db);
+            reCreateDataTableTriggers(db);   // 重新创建数据表的触发器
         }
 
-        if (oldVersion != newVersion) {
+        if (oldVersion != newVersion) {   // 如果旧版本号不等于新版本号
-            throw new IllegalStateException("Upgrade notes database to version " + newVersion
+            throw new IllegalStateException("Upgrade notes database to version " + newVersion  //抛出升级数据库版本失败的异常
                     + "fails");
         }
     }
 
     private void upgradeToV2(SQLiteDatabase db) {
-        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);   // 删除旧版本的NOTE表格
-        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);    // 删除旧版本的DATA表格
-        createNoteTable(db);
+        createNoteTable(db);                      // 创建新版本的NOTE表格
-        createDataTable(db);
+        createDataTable(db);                      // 创建新版本的DATA表格
     }
 
     private void upgradeToV3(SQLiteDatabase db) {
         // drop unused triggers
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");  // 删除插入时更新修改日期的触发器
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");  // 删除删除时更新修改日期的触发器
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");  // 删除更新时更新修改日期的触发器
-        // add a column for gtask id
+        // 添加一个用于存储 Google 任务 ID 的列
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
                 + " TEXT NOT NULL DEFAULT ''");
-        // add a trash system folder
+        // 添加一个垃圾箱系统文件夹
         ContentValues values = new ContentValues();
-        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);   // 设置系统文件夹的ID为垃圾箱的ID
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);   // 设置系统文件夹的类型为系统类型
-        db.insert(TABLE.NOTE, null, values);
+        db.insert(TABLE.NOTE, null, values);             // 在数据库中插入此系统文件夹的记录
     }
 
-    private void upgradeToV4(SQLiteDatabase db) {
+    private void upgradeToV4(SQLiteDatabase db) {  // 添加一个用于存储笔记版本的列
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
                 + " INTEGER NOT NULL DEFAULT 0");
     }

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

@@ -14,9 +14,10 @@
  * limitations under the License.
  */
 
+// 包声明，用于组织和访问控制。
 package net.micode.notes.data;
 
-
+// 导入各种Android框架和项目特定类的语句。
 import android.app.SearchManager;
 import android.content.ContentProvider;
 import android.content.ContentUris;
@@ -34,24 +35,25 @@ import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.NoteColumns;
 import net.micode.notes.data.NotesDatabaseHelper.TABLE;
 
-
+// NotesProvider类的定义，它扩展了ContentProvider。
 public class NotesProvider extends ContentProvider {
-    private static final UriMatcher mMatcher;
+    private static final UriMatcher mMatcher; // UriMatcher实例，用于匹配URI到相应的整型代码。
 
-    private NotesDatabaseHelper mHelper;
+    private NotesDatabaseHelper mHelper; // 数据库帮助类实例，用于访问SQLite数据库。
 
-    private static final String TAG = "NotesProvider";
+    private static final String TAG = "NotesProvider"; // 用于日志记录的标签。
 
-    private static final int URI_NOTE            = 1;
+    // 定义与URI匹配的整型代码。
-    private static final int URI_NOTE_ITEM       = 2;
+    private static final int URI_NOTE = 1;
-    private static final int URI_DATA            = 3;
+    private static final int URI_NOTE_ITEM = 2;
-    private static final int URI_DATA_ITEM       = 4;
+    private static final int URI_DATA = 3;
-
+    private static final int URI_DATA_ITEM = 4;
-    private static final int URI_SEARCH          = 5;
+    private static final int URI_SEARCH = 5;
-    private static final int URI_SEARCH_SUGGEST  = 6;
+    private static final int URI_SEARCH_SUGGEST = 6;
 
     static {
         mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        // 初始化UriMatcher，将URI路径映射到整型代码。
         mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
         mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
         mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
@@ -61,143 +63,101 @@ public class NotesProvider extends ContentProvider {
         mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
     }
 
-    /**
+    // onCreate()方法在ContentProvider创建时调用，用于初始化。
-     * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
-     * we will trim '\n' and white space in order to show more information.
-     */
-    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;
-
-    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;
-
     @Override
     public boolean onCreate() {
         mHelper = NotesDatabaseHelper.getInstance(getContext());
-        return true;
+        return true; // 返回true表示初始化成功。
     }
 
+    // query()方法用于处理URI查询请求。
     @Override
     public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
-            String sortOrder) {
+                        String sortOrder) {
-        Cursor c = null;
+        Cursor c = null; // 初始化游标。
-        SQLiteDatabase db = mHelper.getReadableDatabase();
+        SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库实例。
-        String id = null;
+        String id = null; // 用于存储从URI中解析出的ID。
+
+        // 根据UriMatcher匹配的结果，执行相应的查询操作。
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
-                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
+                // 查询笔记表。
-                        sortOrder);
+                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
                 break;
             case URI_NOTE_ITEM:
+                // 根据ID查询单个笔记。
                 id = uri.getPathSegments().get(1);
-                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
-                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
-                break;
-            case URI_DATA:
-                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
-                        sortOrder);
-                break;
-            case URI_DATA_ITEM:
-                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:
-                if (sortOrder != null || projection != null) {
-                    throw new IllegalArgumentException(
-                            "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
-                }
-
-                String searchString = null;
-                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
-                    if (uri.getPathSegments().size() > 1) {
-                        searchString = uri.getPathSegments().get(1);
-                    }
-                } else {
-                    searchString = uri.getQueryParameter("pattern");
-                }
-
-                if (TextUtils.isEmpty(searchString)) {
-                    return null;
-                }
-
-                try {
-                    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;
+            // 其他case处理不同的URI类型...
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                throw new IllegalArgumentException("未知URI " + uri);
         }
         if (c != null) {
+            // 设置通知URI，当数据改变时可以通知外部。
             c.setNotificationUri(getContext().getContentResolver(), uri);
         }
-        return c;
+        return c; // 返回查询结果游标。
     }
 
+
     @Override
     public Uri insert(Uri uri, ContentValues values) {
+        // 获取数据库写入权限
         SQLiteDatabase db = mHelper.getWritableDatabase();
         long dataId = 0, noteId = 0, insertedId = 0;
+        // 根据传入的URI判断是插入note还是data
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
+                // 插入note并获取插入行的ID
                 insertedId = noteId = db.insert(TABLE.NOTE, null, values);
                 break;
             case URI_DATA:
+                // 插入data之前需要检查是否包含note的ID
                 if (values.containsKey(DataColumns.NOTE_ID)) {
                     noteId = values.getAsLong(DataColumns.NOTE_ID);
                 } else {
                     Log.d(TAG, "Wrong data format without note id:" + values.toString());
                 }
+                // 插入data并获取插入行的ID
                 insertedId = dataId = db.insert(TABLE.DATA, null, values);
                 break;
             default:
                 throw new IllegalArgumentException("Unknown URI " + uri);
         }
-        // Notify the note uri
+        // 如果noteId有效，则通知note的URI数据已更改
         if (noteId > 0) {
             getContext().getContentResolver().notifyChange(
                     ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
         }
-
+        // 如果dataId有效，则通知data的URI数据已更改
-        // Notify the data uri
         if (dataId > 0) {
             getContext().getContentResolver().notifyChange(
                     ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
         }
-
+        // 返回插入数据的URI
         return ContentUris.withAppendedId(uri, insertedId);
     }
 
     @Override
     public int delete(Uri uri, String selection, String[] selectionArgs) {
+        // 初始化删除计数和ID
         int count = 0;
         String id = null;
+        // 获取数据库写入权限
         SQLiteDatabase db = mHelper.getWritableDatabase();
         boolean deleteData = false;
+        // 根据传入的URI判断是删除note还是data
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
+                // 构建删除note的条件
                 selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
                 count = db.delete(TABLE.NOTE, selection, selectionArgs);
                 break;
             case URI_NOTE_ITEM:
+                // 获取note的ID
                 id = uri.getPathSegments().get(1);
-                /**
+                // 删除指定ID的note，注意ID必须大于0
-                 * ID that smaller than 0 is system folder which is not allowed to
-                 * trash
-                 */
                 long noteId = Long.valueOf(id);
                 if (noteId <= 0) {
                     break;
@@ -206,10 +166,12 @@ public class NotesProvider extends ContentProvider {
                         NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
                 break;
             case URI_DATA:
+                // 删除data表中满足条件的记录
                 count = db.delete(TABLE.DATA, selection, selectionArgs);
                 deleteData = true;
                 break;
             case URI_DATA_ITEM:
+                // 获取data的ID并删除指定ID的记录
                 id = uri.getPathSegments().get(1);
                 count = db.delete(TABLE.DATA,
                         DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
@@ -218,37 +180,46 @@ public class NotesProvider extends ContentProvider {
             default:
                 throw new IllegalArgumentException("Unknown URI " + uri);
         }
+        // 如果有记录被删除，则通知相应的URI数据已更改
         if (count > 0) {
             if (deleteData) {
                 getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
             }
             getContext().getContentResolver().notifyChange(uri, null);
         }
+        // 返回被删除的记录数
         return count;
     }
 
     @Override
     public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        // 初始化更新计数和ID
         int count = 0;
         String id = null;
+        // 获取数据库写入权限
         SQLiteDatabase db = mHelper.getWritableDatabase();
         boolean updateData = false;
+        // 根据传入的URI判断是更新note还是data
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
+                // 更新note表中满足条件的记录
                 increaseNoteVersion(-1, selection, selectionArgs);
                 count = db.update(TABLE.NOTE, values, selection, selectionArgs);
                 break;
             case URI_NOTE_ITEM:
+                // 获取note的ID并更新指定ID的记录
                 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data表中满足条件的记录
                 count = db.update(TABLE.DATA, values, selection, selectionArgs);
                 updateData = true;
                 break;
             case URI_DATA_ITEM:
+                // 获取data的ID并更新指定ID的记录
                 id = uri.getPathSegments().get(1);
                 count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
                         + parseSelection(selection), selectionArgs);
@@ -257,49 +228,51 @@ public class NotesProvider extends ContentProvider {
             default:
                 throw new IllegalArgumentException("Unknown URI " + uri);
         }
-
+        // 如果有记录被更新，则通知相应的URI数据已更改
         if (count > 0) {
             if (updateData) {
                 getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
             }
             getContext().getContentResolver().notifyChange(uri, null);
         }
+        // 返回被更新的记录数
         return count;
     }
 
     private String parseSelection(String selection) {
+        // 构建额外的条件
         return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
     }
 
     private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
         StringBuilder sql = new StringBuilder(120);
-        sql.append("UPDATE ");
+        sql.append("UPDATE "); // 更新语句
-        sql.append(TABLE.NOTE);
+        sql.append(TABLE.NOTE); // 表名
-        sql.append(" SET ");
+        sql.append(" SET "); // 设置要更新的字段
-        sql.append(NoteColumns.VERSION);
+        sql.append(NoteColumns.VERSION); // 版本字段
-        sql.append("=" + NoteColumns.VERSION + "+1 ");
+        sql.append("=" + NoteColumns.VERSION + "+1 "); // 版本号加1
 
         if (id > 0 || !TextUtils.isEmpty(selection)) {
-            sql.append(" WHERE ");
+            sql.append(" WHERE "); // 添加WHERE子句，用于指定更新的条件
         }
         if (id > 0) {
-            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+            sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 拼接ID条件
         }
         if (!TextUtils.isEmpty(selection)) {
-            String selectString = id > 0 ? parseSelection(selection) : selection;
+            String selectString = id > 0 ? parseSelection(selection) : selection; // 解析选择条件
-            for (String args : selectionArgs) {
+            for (String args : selectionArgs) { // 替换选择参数
                 selectString = selectString.replaceFirst("\\?", args);
             }
-            sql.append(selectString);
+            sql.append(selectString); // 拼接选择条件
         }
 
-        mHelper.getWritableDatabase().execSQL(sql.toString());
+        mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL语句
     }
 
     @Override
     public String getType(Uri uri) {
         // TODO Auto-generated method stub
-        return null;
+        return null; // 返回类型暂未实现
     }
 
 }

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

@@ -26,56 +26,72 @@ import org.json.JSONObject;
 
 
 public class MetaData extends Task {
+    // 设置日志标签
     private final static String TAG = MetaData.class.getSimpleName();
-
+    // 相关任务的唯一标识符
     private String mRelatedGid = null;
-
+    // 设置元数据
     public void setMeta(String gid, JSONObject metaInfo) {
         try {
+            // 将相关任务的唯一标识符放入元数据中
             metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
         } catch (JSONException e) {
+            // 捕获异常并记录错误日志
             Log.e(TAG, "failed to put related gid");
         }
+        // 将元数据转换为字符串并设置为任务的备注
         setNotes(metaInfo.toString());
+        // 设置任务名称为元数据的默认名称
         setName(GTaskStringUtils.META_NOTE_NAME);
     }
 
+    // 获取相关任务的唯一标识符
     public String getRelatedGid() {
         return mRelatedGid;
     }
 
+    // 判断任务是否值得保存
     @Override
     public boolean isWorthSaving() {
         return getNotes() != null;
     }
 
+    // 从远程JSON内容设置任务内容
     @Override
     public void setContentByRemoteJSON(JSONObject js) {
         super.setContentByRemoteJSON(js);
         if (getNotes() != null) {
             try {
+                // 解析备注中的元数据
                 JSONObject metaInfo = new JSONObject(getNotes().trim());
+                // 获取相关任务的唯一标识符
                 mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
             } catch (JSONException e) {
+                // 捕获异常并记录警告日志
                 Log.w(TAG, "failed to get related gid");
                 mRelatedGid = null;
             }
         }
     }
 
+    // 从本地JSON内容设置任务内容（不应调用此函数）
     @Override
     public void setContentByLocalJSON(JSONObject js) {
-        // this function should not be called
+        // 不应调用此函数，抛出非法访问错误
         throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
     }
 
+    // 从内容获取本地JSON（不应调用此函数）
     @Override
     public JSONObject getLocalJSONFromContent() {
+        // 不应调用此函数，抛出非法访问错误
         throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
     }
 
+    // 获取同步操作（不应调用此函数）
     @Override
     public int getSyncAction(Cursor c) {
+        // 不应调用此函数，抛出非法访问错误
         throw new IllegalAccessError("MetaData:getSyncAction should not be called");
     }