diff --git a/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java b/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java
index d2b4082..35ac648 100644
--- a/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java
+++ b/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java
@@ -48,12 +48,12 @@ import java.util.Iterator;
 import java.util.Map;
 
 
-public class GTaskManager {
-    private static final String TAG = GTaskManager.class.getSimpleName();
+public class GTaskManager {// 该类用于管理 GTasks
+    private static final String TAG = GTaskManager.class.getSimpleName();// TAG 用于打印日志
 
-    public static final int STATE_SUCCESS = 0;
+    public static final int STATE_SUCCESS = 0;// 定义了一些常量
 
-    public static final int STATE_NETWORK_ERROR = 1;
+    public static final int STATE_NETWORK_ERROR = 1;// 定义了一些常量
 
     public static final int STATE_INTERNAL_ERROR = 2;
 
@@ -87,7 +87,7 @@ public class GTaskManager {
 
     private HashMap<Long, String> mNidToGid;
 
-    private GTaskManager() {
+    private GTaskManager() { // 构造函数
         mSyncing = false;
         mCancelled = false;
         mGTaskListHashMap = new HashMap<String, TaskList>();
@@ -99,19 +99,19 @@ public class GTaskManager {
         mNidToGid = new HashMap<Long, String>();
     }
 
-    public static synchronized GTaskManager getInstance() {
+    public static synchronized GTaskManager getInstance() { // 单例模式
         if (mInstance == null) {
             mInstance = new GTaskManager();
         }
         return mInstance;
     }
 
-    public synchronized void setActivityContext(Activity activity) {
+    public synchronized void setActivityContext(Activity activity) { // 设置 activity
         // used for getting authtoken
         mActivity = activity;
     }
 
-    public int sync(Context context, GTaskASyncTask asyncTask) {
+    public int sync(Context context, GTaskASyncTask asyncTask) { // 同步
         if (mSyncing) {
             Log.d(TAG, "Sync is in progress");
             return STATE_SYNC_IN_PROGRESS;
@@ -127,25 +127,25 @@ public class GTaskManager {
         mGidToNid.clear();
         mNidToGid.clear();
 
-        try {
+        try { // try catch 语句
             GTaskClient client = GTaskClient.getInstance();
             client.resetUpdateArray();
 
             // login google task
-            if (!mCancelled) {
+            if (!mCancelled) {// 如果没有取消
                 if (!client.login(mActivity)) {
                     throw new NetworkFailureException("login google task failed");
                 }
             }
 
             // get the task list from google
-            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));// 发布进度
             initGTaskList();
 
             // do content sync work
-            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));// 发布进度
             syncContent();
-        } catch (NetworkFailureException e) {
+        } catch (NetworkFailureException e) {// 捕获异常
             Log.e(TAG, e.toString());
             return STATE_NETWORK_ERROR;
         } catch (ActionFailureException e) {
@@ -155,7 +155,7 @@ public class GTaskManager {
             Log.e(TAG, e.toString());
             e.printStackTrace();
             return STATE_INTERNAL_ERROR;
-        } finally {
+        } finally {// finally 语句
             mGTaskListHashMap.clear();
             mGTaskHashMap.clear();
             mMetaHashMap.clear();
@@ -165,25 +165,25 @@ public class GTaskManager {
             mSyncing = false;
         }
 
-        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;
+        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;// 返回状态
     }
 
-    private void initGTaskList() throws NetworkFailureException {
+    private void initGTaskList() throws NetworkFailureException {// 初始化 GTasks
         if (mCancelled)
             return;
-        GTaskClient client = GTaskClient.getInstance();
+        GTaskClient client = GTaskClient.getInstance();// 获取 GTasks 客户端
         try {
-            JSONArray jsTaskLists = client.getTaskLists();
+            JSONArray jsTaskLists = client.getTaskLists();// 获取 GTasks 列表
 
             // init meta list first
-            mMetaList = null;
+            mMetaList = null;// 初始化 meta list
             for (int i = 0; i < jsTaskLists.length(); i++) {
                 JSONObject object = jsTaskLists.getJSONObject(i);
                 String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
                 String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
 
                 if (name
-                        .equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                        .equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {// 如果是 meta 文件夹
                     mMetaList = new TaskList();
                     mMetaList.setContentByRemoteJSON(object);
 
@@ -204,6 +204,7 @@ public class GTaskManager {
             }
 
             // create meta list if not existed
+            // 创建 meta list
             if (mMetaList == null) {
                 mMetaList = new TaskList();
                 mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
@@ -212,6 +213,7 @@ public class GTaskManager {
             }
 
             // init task list
+            // 初始化 task list
             for (int i = 0; i < jsTaskLists.length(); i++) {
                 JSONObject object = jsTaskLists.getJSONObject(i);
                 String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
@@ -240,14 +242,14 @@ public class GTaskManager {
                     }
                 }
             }
-        } catch (JSONException e) {
+        } catch (JSONException e) {// 捕获异常
             Log.e(TAG, e.toString());
             e.printStackTrace();
             throw new ActionFailureException("initGTaskList: handing JSONObject failed");
         }
     }
 
-    private void syncContent() throws NetworkFailureException {
+    private void syncContent() throws NetworkFailureException {// 同步内容
         int syncType;
         Cursor c = null;
         String gid;
@@ -255,12 +257,12 @@ public class GTaskManager {
 
         mLocalDeleteIdMap.clear();
 
-        if (mCancelled) {
+        if (mCancelled) {// 如果取消
             return;
         }
 
         // for local deleted note
-        try {
+        try {// try 语句
             c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
                     "(type<>? AND parent_id=?)", new String[] {
                             String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
@@ -290,16 +292,16 @@ public class GTaskManager {
         syncFolder();
 
         // for note existing in database
-        try {
+        try {// try 语句
             c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
                     "(type=? AND parent_id<>?)", new String[] {
                             String.valueOf(Notes.TYPE_NOTE), String.valueOf(Notes.ID_TRASH_FOLER)
                     }, NoteColumns.TYPE + " DESC");
-            if (c != null) {
+            if (c != null) {// 如果 c 不为空
                 while (c.moveToNext()) {
                     gid = c.getString(SqlNote.GTASK_ID_COLUMN);
                     node = mGTaskHashMap.get(gid);
-                    if (node != null) {
+                    if (node != null) {// 如果 node 不为空
                         mGTaskHashMap.remove(gid);
                         mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
                         mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
@@ -319,7 +321,7 @@ public class GTaskManager {
                 Log.w(TAG, "failed to query existing note in database");
             }
 
-        } finally {
+        } finally { // finally 语句
             if (c != null) {
                 c.close();
                 c = null;
@@ -327,6 +329,7 @@ public class GTaskManager {
         }
 
         // go through remaining items
+        // for note not existing in database
         Iterator<Map.Entry<String, Node>> iter = mGTaskHashMap.entrySet().iterator();
         while (iter.hasNext()) {
             Map.Entry<String, Node> entry = iter.next();
@@ -351,7 +354,7 @@ public class GTaskManager {
 
     }
 
-    private void syncFolder() throws NetworkFailureException {
+    private void syncFolder() throws NetworkFailureException {// 同步文件夹
         Cursor c = null;
         String gid;
         Node node;
@@ -362,26 +365,28 @@ public class GTaskManager {
         }
 
         // for root folder
-        try {
-            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+        try {// try 语句
+            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,// 通过id查询
                     Notes.ID_ROOT_FOLDER), SqlNote.PROJECTION_NOTE, null, null, null);
             if (c != null) {
                 c.moveToNext();
-                gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                gid = c.getString(SqlNote.GTASK_ID_COLUMN);// 获取gtask_id
                 node = mGTaskHashMap.get(gid);
                 if (node != null) {
                     mGTaskHashMap.remove(gid);
-                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER);
+                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER); // for system folder, only
+                                                                     // update remote name if
+                                                                     // necessary
                     mNidToGid.put((long) Notes.ID_ROOT_FOLDER, gid);
                     // for system folder, only update remote name if necessary
                     if (!node.getName().equals(
                             GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT))
                         doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
                 } else {
-                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);// 添加远程
                 }
             } else {
-                Log.w(TAG, "failed to query root folder");
+                Log.w(TAG, "failed to query root folder");// 查询根文件夹失败
             }
         } finally {
             if (c != null) {
@@ -392,24 +397,27 @@ public class GTaskManager {
 
         // for call-note folder
         try {
-            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",// 通过id查询
                     new String[] {
                         String.valueOf(Notes.ID_CALL_RECORD_FOLDER)
                     }, null);
-            if (c != null) {
+            if (c != null) { // 如果 c 不为空
                 if (c.moveToNext()) {
                     gid = c.getString(SqlNote.GTASK_ID_COLUMN);
                     node = mGTaskHashMap.get(gid);
                     if (node != null) {
                         mGTaskHashMap.remove(gid);
-                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);
+                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);// for system folder,
+                                                                                // only update
+                                                                                // remote name if
+                                                                                // necessary
                         mNidToGid.put((long) Notes.ID_CALL_RECORD_FOLDER, gid);
                         // for system folder, only update remote name if
                         // necessary
                         if (!node.getName().equals(
                                 GTaskStringUtils.MIUI_FOLDER_PREFFIX
                                         + GTaskStringUtils.FOLDER_CALL_NOTE))
-                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);// 更新远程
                     } else {
                         doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
                     }
@@ -522,29 +530,29 @@ public class GTaskManager {
         }
     }
 
-    private void addLocalNode(Node node) throws NetworkFailureException {
+    private void addLocalNode(Node node) throws NetworkFailureException {  // 添加本地节点
         if (mCancelled) {
             return;
         }
 
-        SqlNote sqlNote;
+        SqlNote sqlNote; // sql笔记
         if (node instanceof TaskList) {
-            if (node.getName().equals(
+            if (node.getName().equals(// 根目录
                     GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT)) {
                 sqlNote = new SqlNote(mContext, Notes.ID_ROOT_FOLDER);
-            } else if (node.getName().equals(
-                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE)) {
+            } else if (node.getName().equals(// 回收站
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE)) { // 通话记录
                 sqlNote = new SqlNote(mContext, Notes.ID_CALL_RECORD_FOLDER);
-            } else {
+            } else {// 其他文件夹
                 sqlNote = new SqlNote(mContext);
                 sqlNote.setContent(node.getLocalJSONFromContent());
                 sqlNote.setParentId(Notes.ID_ROOT_FOLDER);
             }
-        } else {
+        } else {// 其他节点
             sqlNote = new SqlNote(mContext);
             JSONObject js = node.getLocalJSONFromContent();
             try {
-                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) {// 备注
                     JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
                     if (note.has(NoteColumns.ID)) {
                         long id = note.getLong(NoteColumns.ID);
@@ -555,7 +563,7 @@ public class GTaskManager {
                     }
                 }
 
-                if (js.has(GTaskStringUtils.META_HEAD_DATA)) {
+                if (js.has(GTaskStringUtils.META_HEAD_DATA)) {// 数据
                     JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
                     for (int i = 0; i < dataArray.length(); i++) {
                         JSONObject data = dataArray.getJSONObject(i);
@@ -570,18 +578,18 @@ public class GTaskManager {
                     }
 
                 }
-            } catch (JSONException e) {
+            } catch (JSONException e) {// json异常
                 Log.w(TAG, e.toString());
                 e.printStackTrace();
             }
-            sqlNote.setContent(js);
+            sqlNote.setContent(js);// 设置内容
 
-            Long parentId = mGidToNid.get(((Task) node).getParent().getGid());
-            if (parentId == null) {
+            Long parentId = mGidToNid.get(((Task) node).getParent().getGid());// 获取父节点
+            if (parentId == null) {// 父节点为空
                 Log.e(TAG, "cannot find task's parent id locally");
                 throw new ActionFailureException("cannot add local node");
             }
-            sqlNote.setParentId(parentId.longValue());
+            sqlNote.setParentId(parentId.longValue());// 设置父节点
         }
 
         // create the local node
@@ -596,17 +604,17 @@ public class GTaskManager {
         updateRemoteMeta(node.getGid(), sqlNote);
     }
 
-    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
+    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {// 更新本地节点
         if (mCancelled) {
             return;
         }
 
-        SqlNote sqlNote;
+        SqlNote sqlNote;// sql笔记
         // update the note locally
         sqlNote = new SqlNote(mContext, c);
-        sqlNote.setContent(node.getLocalJSONFromContent());
+        sqlNote.setContent(node.getLocalJSONFromContent());// 设置内容
 
-        Long parentId = (node instanceof Task) ? mGidToNid.get(((Task) node).getParent().getGid())
+        Long parentId = (node instanceof Task) ? mGidToNid.get(((Task) node).getParent().getGid())// 获取父节点
                 : new Long(Notes.ID_ROOT_FOLDER);
         if (parentId == null) {
             Log.e(TAG, "cannot find task's parent id locally");
@@ -616,10 +624,10 @@ public class GTaskManager {
         sqlNote.commit(true);
 
         // update meta info
-        updateRemoteMeta(node.getGid(), sqlNote);
+        updateRemoteMeta(node.getGid(), sqlNote);// 更新远程元数据
     }
 
-    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {// 添加远程节点
         if (mCancelled) {
             return;
         }
@@ -628,7 +636,7 @@ public class GTaskManager {
         Node n;
 
         // update remotely
-        if (sqlNote.isNoteType()) {
+        if (sqlNote.isNoteType()) {// 笔记类型
             Task task = new Task();
             task.setContentByLocalJSON(sqlNote.getContent());
 
@@ -644,7 +652,7 @@ public class GTaskManager {
 
             // add meta
             updateRemoteMeta(task.getGid(), sqlNote);
-        } else {
+        } else {// 文件夹类型
             TaskList tasklist = null;
 
             // we need to skip folder if it has already existed
@@ -656,8 +664,8 @@ public class GTaskManager {
             else
                 folderName += sqlNote.getSnippet();
 
-            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
-            while (iter.hasNext()) {
+            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();// 迭代器
+            while (iter.hasNext()) {// 遍历
                 Map.Entry<String, TaskList> entry = iter.next();
                 String gid = entry.getKey();
                 TaskList list = entry.getValue();
@@ -672,7 +680,7 @@ public class GTaskManager {
             }
 
             // no match we can add now
-            if (tasklist == null) {
+            if (tasklist == null) {// 任务列表为空
                 tasklist = new TaskList();
                 tasklist.setContentByLocalJSON(sqlNote.getContent());
                 GTaskClient.getInstance().createTaskList(tasklist);
@@ -682,7 +690,7 @@ public class GTaskManager {
         }
 
         // update local note
-        sqlNote.setGtaskId(n.getGid());
+        sqlNote.setGtaskId(n.getGid());// 设置gid
         sqlNote.commit(false);
         sqlNote.resetLocalModified();
         sqlNote.commit(true);
@@ -692,7 +700,7 @@ public class GTaskManager {
         mNidToGid.put(sqlNote.getId(), n.getGid());
     }
 
-    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {// 更新远程节点
         if (mCancelled) {
             return;
         }
@@ -730,7 +738,7 @@ public class GTaskManager {
         sqlNote.commit(true);
     }
 
-    private void updateRemoteMeta(String gid, SqlNote sqlNote) throws NetworkFailureException {
+    private void updateRemoteMeta(String gid, SqlNote sqlNote) throws NetworkFailureException {// 更新远程元数据
         if (sqlNote != null && sqlNote.isNoteType()) {
             MetaData metaData = mMetaHashMap.get(gid);
             if (metaData != null) {
@@ -746,7 +754,7 @@ public class GTaskManager {
         }
     }
 
-    private void refreshLocalSyncId() throws NetworkFailureException {
+    private void refreshLocalSyncId() throws NetworkFailureException {// 刷新本地同步id
         if (mCancelled) {
             return;
         }
@@ -758,12 +766,12 @@ public class GTaskManager {
         initGTaskList();
 
         Cursor c = null;
-        try {
+        try {// 尝试
             c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
                     "(type<>? AND parent_id<>?)", new String[] {
                             String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
                     }, NoteColumns.TYPE + " DESC");
-            if (c != null) {
+            if (c != null) {// 如果游标不为空
                 while (c.moveToNext()) {
                     String gid = c.getString(SqlNote.GTASK_ID_COLUMN);
                     Node node = mGTaskHashMap.get(gid);
@@ -773,7 +781,7 @@ public class GTaskManager {
                         values.put(NoteColumns.SYNC_ID, node.getLastModified());
                         mContentResolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
                                 c.getLong(SqlNote.ID_COLUMN)), values, null, null);
-                    } else {
+                    } else {  // if we can't find the node, it means the node is deleted remotely
                         Log.e(TAG, "something is missed");
                         throw new ActionFailureException(
                                 "some local items don't have gid after sync");
@@ -792,9 +800,10 @@ public class GTaskManager {
 
     public String getSyncAccount() {
         return GTaskClient.getInstance().getSyncAccount().name;
-    }
+    } // 获取同步账户
 
     public void cancelSync() {
         mCancelled = true;
-    }
+    } // 取消同步
+
 }
diff --git a/src/main/java/net/micode/notes/ui/NoteEditActivity.java b/src/main/java/net/micode/notes/ui/NoteEditActivity.java
index 7fd46e3..7e3ba2f 100644
--- a/src/main/java/net/micode/notes/ui/NoteEditActivity.java
+++ b/src/main/java/net/micode/notes/ui/NoteEditActivity.java
@@ -166,7 +166,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
      * user load this activity, we should restore the former state
      */
     @Override
-    protected void onRestoreInstanceState(Bundle savedInstanceState) {
+    protected void onRestoreInstanceState(Bundle savedInstanceState) {//
         super.onRestoreInstanceState(savedInstanceState);
         if (savedInstanceState != null && savedInstanceState.containsKey(Intent.EXTRA_UID)) {
             Intent intent = new Intent(Intent.ACTION_VIEW);
diff --git a/src/main/java/net/micode/notes/ui/NotesListActivity.java b/src/main/java/net/micode/notes/ui/NotesListActivity.java
index 5fcfbfd..53435a9 100644
--- a/src/main/java/net/micode/notes/ui/NotesListActivity.java
+++ b/src/main/java/net/micode/notes/ui/NotesListActivity.java
@@ -312,14 +312,14 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             updateMenu();
         }
 
-        public boolean onMenuItemClick(MenuItem item) {
+        public boolean onMenuItemClick(MenuItem item) {//菜单点击
             if (mNotesListAdapter.getSelectedCount() == 0) {
                 Toast.makeText(NotesListActivity.this, getString(R.string.menu_select_none),
                         Toast.LENGTH_SHORT).show();
                 return true;
             }
 
-            switch (item.getItemId()) {
+            switch (item.getItemId()) {//项目
                 case R.id.delete:
                     AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
                     builder.setTitle(getString(R.string.alert_title_delete));
@@ -346,9 +346,9 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }
     }
 
-    private class NewNoteOnTouchListener implements OnTouchListener {
+    private class NewNoteOnTouchListener implements OnTouchListener {//新的触摸事件
 
-        public boolean onTouch(View v, MotionEvent event) {
+        public boolean onTouch(View v, MotionEvent event) {//触摸
             switch (event.getAction()) {
                 case MotionEvent.ACTION_DOWN: {
                     Display display = getWindowManager().getDefaultDisplay();
@@ -386,7 +386,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                     }
                     break;
                 }
-                case MotionEvent.ACTION_MOVE: {
+                case MotionEvent.ACTION_MOVE: {  //移动
                     if (mDispatch) {
                         mDispatchY += (int) event.getY() - mOriginY;
                         event.setLocation(event.getX(), mDispatchY);
@@ -395,7 +395,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                     break;
                 }
                 default: {
-                    if (mDispatch) {
+                    if (mDispatch) {//分发
                         event.setLocation(event.getX(), mDispatchY);
                         mDispatch = false;
                         return mNotesListView.dispatchTouchEvent(event);
@@ -408,7 +408,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
     };
 
-    private void startAsyncNotesListQuery() {
+    private void startAsyncNotesListQuery() {//开始异步笔记列表查询
         String selection = (mCurrentFolderId == Notes.ID_ROOT_FOLDER) ? ROOT_FOLDER_SELECTION
                 : NORMAL_SELECTION;
         mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, null,
@@ -417,7 +417,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                 }, NoteColumns.TYPE + " DESC," + NoteColumns.MODIFIED_DATE + " DESC");
     }
 
-    private final class BackgroundQueryHandler extends AsyncQueryHandler {
+    private final class BackgroundQueryHandler extends AsyncQueryHandler {  //后台查询处理
         public BackgroundQueryHandler(ContentResolver contentResolver) {
             super(contentResolver);
         }
@@ -441,7 +441,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }
     }
 
-    private void showFolderListMenu(Cursor cursor) {
+    private void showFolderListMenu(Cursor cursor) {//显示文件夹列表菜单
         AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
         builder.setTitle(R.string.menu_title_select_folder);
         final FoldersListAdapter adapter = new FoldersListAdapter(this, cursor);
@@ -462,14 +462,14 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         builder.show();
     }
 
-    private void createNewNote() {
+    private void createNewNote() {//创建新的笔记
         Intent intent = new Intent(this, NoteEditActivity.class);
         intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
         intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mCurrentFolderId);
         this.startActivityForResult(intent, REQUEST_CODE_NEW_NODE);
     }
 
-    private void batchDelete() {
+    private void batchDelete() {//批量删除
         new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() {
             protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) {
                 HashSet<AppWidgetAttribute> widgets = mNotesListAdapter.getSelectedWidget();
@@ -492,7 +492,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             }
 
             @Override
-            protected void onPostExecute(HashSet<AppWidgetAttribute> widgets) {
+            protected void onPostExecute(HashSet<AppWidgetAttribute> widgets) {//执行后
                 if (widgets != null) {
                     for (AppWidgetAttribute widget : widgets) {
                         if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID
@@ -506,7 +506,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }.execute();
     }
 
-    private void deleteFolder(long folderId) {
+    private void deleteFolder(long folderId) {//删除文件夹
         if (folderId == Notes.ID_ROOT_FOLDER) {
             Log.e(TAG, "Wrong folder id, should not happen " + folderId);
             return;
@@ -516,14 +516,14 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         ids.add(folderId);
         HashSet<AppWidgetAttribute> widgets = DataUtils.getFolderNoteWidget(mContentResolver,
                 folderId);
-        if (!isSyncMode()) {
+        if (!isSyncMode()) {//如果不是同步模式
             // if not synced, delete folder directly
             DataUtils.batchDeleteNotes(mContentResolver, ids);
         } else {
             // in sync mode, we'll move the deleted folder into the trash folder
             DataUtils.batchMoveToFolder(mContentResolver, ids, Notes.ID_TRASH_FOLER);
         }
-        if (widgets != null) {
+        if (widgets != null) {//如果小部件不为空
             for (AppWidgetAttribute widget : widgets) {
                 if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID
                         && widget.widgetType != Notes.TYPE_WIDGET_INVALIDE) {
@@ -533,14 +533,14 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }
     }
 
-    private void openNode(NoteItemData data) {
+    private void openNode(NoteItemData data) {//打开笔记
         Intent intent = new Intent(this, NoteEditActivity.class);
         intent.setAction(Intent.ACTION_VIEW);
         intent.putExtra(Intent.EXTRA_UID, data.getId());
         this.startActivityForResult(intent, REQUEST_CODE_OPEN_NODE);
     }
 
-    private void openFolder(NoteItemData data) {
+    private void openFolder(NoteItemData data) {//打开文件夹
         mCurrentFolderId = data.getId();
         startAsyncNotesListQuery();
         if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
@@ -557,7 +557,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         mTitleBar.setVisibility(View.VISIBLE);
     }
 
-    public void onClick(View v) {
+    public void onClick(View v) {//点击事件
         switch (v.getId()) {
             case R.id.btn_new_note:
                 createNewNote();
@@ -567,24 +567,24 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }
     }
 
-    private void showSoftInput() {
+    private void showSoftInput() {//显示软键盘
         InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
         if (inputMethodManager != null) {
             inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
         }
     }
 
-    private void hideSoftInput(View view) {
+    private void hideSoftInput(View view) {//隐藏软键盘
         InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
         inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
     }
 
-    private void showCreateOrModifyFolderDialog(final boolean create) {
+    private void showCreateOrModifyFolderDialog(final boolean create) {//显示创建或修改文件夹对话框
         final AlertDialog.Builder builder = new AlertDialog.Builder(this);
         View view = LayoutInflater.from(this).inflate(R.layout.dialog_edit_text, null);
         final EditText etName = (EditText) view.findViewById(R.id.et_foler_name);
         showSoftInput();
-        if (!create) {
+        if (!create) {//如果不是创建
             if (mFocusNoteDataItem != null) {
                 etName.setText(mFocusNoteDataItem.getSnippet());
                 builder.setTitle(getString(R.string.menu_folder_change_name));
@@ -604,19 +604,19 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             }
         });
 
-        final Dialog dialog = builder.setView(view).show();
-        final Button positive = (Button)dialog.findViewById(android.R.id.button1);
+        final Dialog dialog = builder.setView(view).show();//显示对话框
+        final Button positive = (Button)dialog.findViewById(android.R.id.button1); //获取确定按钮
         positive.setOnClickListener(new OnClickListener() {
             public void onClick(View v) {
                 hideSoftInput(etName);
                 String name = etName.getText().toString();
-                if (DataUtils.checkVisibleFolderName(mContentResolver, name)) {
+                if (DataUtils.checkVisibleFolderName(mContentResolver, name)) {//如果文件夹名字存在
                     Toast.makeText(NotesListActivity.this, getString(R.string.folder_exist, name),
                             Toast.LENGTH_LONG).show();
                     etName.setSelection(0, etName.length());
                     return;
                 }
-                if (!create) {
+                if (!create) {//如果不是创建
                     if (!TextUtils.isEmpty(name)) {
                         ContentValues values = new ContentValues();
                         values.put(NoteColumns.SNIPPET, name);
@@ -627,7 +627,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                             String.valueOf(mFocusNoteDataItem.getId())
                         });
                     }
-                } else if (!TextUtils.isEmpty(name)) {
+                } else if (!TextUtils.isEmpty(name)) { //如果是创建
                     ContentValues values = new ContentValues();
                     values.put(NoteColumns.SNIPPET, name);
                     values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
@@ -638,26 +638,26 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         });
 
         if (TextUtils.isEmpty(etName.getText())) {
-            positive.setEnabled(false);
+            positive.setEnabled(false);//如果名字为空，确定按钮不可用
         }
         /**
          * When the name edit text is null, disable the positive button
          */
-        etName.addTextChangedListener(new TextWatcher() {
+        etName.addTextChangedListener(new TextWatcher() {//添加文本改变监听器
             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                 // TODO Auto-generated method stub
 
             }
 
             public void onTextChanged(CharSequence s, int start, int before, int count) {
-                if (TextUtils.isEmpty(etName.getText())) {
+                if (TextUtils.isEmpty(etName.getText())) {//如果名字为空
                     positive.setEnabled(false);
                 } else {
                     positive.setEnabled(true);
                 }
             }
 
-            public void afterTextChanged(Editable s) {
+            public void afterTextChanged(Editable s) {//文本改变后
                 // TODO Auto-generated method stub
 
             }
@@ -665,7 +665,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
     }
 
     @Override
-    public void onBackPressed() {
+    public void onBackPressed() { //返回键
         switch (mState) {
             case SUB_FOLDER:
                 mCurrentFolderId = Notes.ID_ROOT_FOLDER;
@@ -688,7 +688,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }
     }
 
-    private void updateWidget(int appWidgetId, int appWidgetType) {
+    private void updateWidget(int appWidgetId, int appWidgetType) {//更新小部件
         Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
         if (appWidgetType == Notes.TYPE_WIDGET_2X) {
             intent.setClass(this, NoteWidgetProvider_2x.class);
@@ -707,7 +707,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         setResult(RESULT_OK, intent);
     }
 
-    private final OnCreateContextMenuListener mFolderOnCreateContextMenuListener = new OnCreateContextMenuListener() {
+    private final OnCreateContextMenuListener mFolderOnCreateContextMenuListener = new OnCreateContextMenuListener() {//文件夹上下文菜单监听器
         public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
             if (mFocusNoteDataItem != null) {
                 menu.setHeaderTitle(mFocusNoteDataItem.getSnippet());
@@ -719,7 +719,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
     };
 
     @Override
-    public void onContextMenuClosed(Menu menu) {
+    public void onContextMenuClosed(Menu menu) {//上下文菜单关闭
         if (mNotesListView != null) {
             mNotesListView.setOnCreateContextMenuListener(null);
         }
@@ -727,7 +727,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
     }
 
     @Override
-    public boolean onContextItemSelected(MenuItem item) {
+    public boolean onContextItemSelected(MenuItem item) {//上下文菜单项被选中
         if (mFocusNoteDataItem == null) {
             Log.e(TAG, "The long click data item is null");
             return false;
@@ -737,7 +737,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                 openFolder(mFocusNoteDataItem);
                 break;
             case MENU_FOLDER_DELETE:
-                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);//弹出对话框
                 builder.setTitle(getString(R.string.alert_title_delete));
                 builder.setIcon(android.R.drawable.ic_dialog_alert);
                 builder.setMessage(getString(R.string.alert_message_delete_folder));
@@ -747,11 +747,11 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                                 deleteFolder(mFocusNoteDataItem.getId());
                             }
                         });
-                builder.setNegativeButton(android.R.string.cancel, null);
+                builder.setNegativeButton(android.R.string.cancel, null);//取消
                 builder.show();
                 break;
             case MENU_FOLDER_CHANGE_NAME:
-                showCreateOrModifyFolderDialog(false);
+                showCreateOrModifyFolderDialog(false);//显示创建或修改文件夹对话框
                 break;
             default:
                 break;
@@ -761,7 +761,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
     }
 
     @Override
-    public boolean onPrepareOptionsMenu(Menu menu) {
+    public boolean onPrepareOptionsMenu(Menu menu) {//准备菜单
         menu.clear();
         if (mState == ListEditState.NOTE_LIST) {
             getMenuInflater().inflate(R.menu.note_list, menu);
@@ -779,7 +779,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
     }
 
     @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
+    public boolean onOptionsItemSelected(MenuItem item) {//菜单项被选中
         switch (item.getItemId()) {
             case R.id.menu_new_folder: {
                 showCreateOrModifyFolderDialog(true);
@@ -791,7 +791,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             }
             case R.id.menu_sync: {
                 if (isSyncMode()) {
-                    if (TextUtils.equals(item.getTitle(), getString(R.string.menu_sync))) {
+                    if (TextUtils.equals(item.getTitle(), getString(R.string.menu_sync))) { // start sync
                         GTaskSyncService.startSync(this);
                     } else {
                         GTaskSyncService.cancelSync(this);
@@ -801,15 +801,15 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                 }
                 break;
             }
-            case R.id.menu_setting: {
+            case R.id.menu_setting: {//设置
                 startPreferenceActivity();
                 break;
             }
-            case R.id.menu_new_note: {
+            case R.id.menu_new_note: {//新建便签
                 createNewNote();
                 break;
             }
-            case R.id.menu_search:
+            case R.id.menu_search://搜索
                 onSearchRequested();
                 break;
             default:
@@ -819,12 +819,12 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
     }
 
     @Override
-    public boolean onSearchRequested() {
+    public boolean onSearchRequested() {//搜索请求
         startSearch(null, false, null /* appData */, false);
         return true;
     }
 
-    private void exportNoteToText() {
+    private void exportNoteToText() {//导出便签到文本
         final BackupUtils backup = BackupUtils.getInstance(NotesListActivity.this);
         new AsyncTask<Void, Void, Integer>() {
 
@@ -835,7 +835,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
             @Override
             protected void onPostExecute(Integer result) {
-                if (result == BackupUtils.STATE_SD_CARD_UNMOUONTED) {
+                if (result == BackupUtils.STATE_SD_CARD_UNMOUONTED) {//SD卡未挂载
                     AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
                     builder.setTitle(NotesListActivity.this
                             .getString(R.string.failed_sdcard_export));
@@ -843,7 +843,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                             .getString(R.string.error_sdcard_unmounted));
                     builder.setPositiveButton(android.R.string.ok, null);
                     builder.show();
-                } else if (result == BackupUtils.STATE_SUCCESS) {
+                } else if (result == BackupUtils.STATE_SUCCESS) {//成功
                     AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
                     builder.setTitle(NotesListActivity.this
                             .getString(R.string.success_sdcard_export));
@@ -852,7 +852,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                                     .getExportedTextFileName(), backup.getExportedTextFileDir()));
                     builder.setPositiveButton(android.R.string.ok, null);
                     builder.show();
-                } else if (result == BackupUtils.STATE_SYSTEM_ERROR) {
+                } else if (result == BackupUtils.STATE_SYSTEM_ERROR) {//系统错误
                     AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
                     builder.setTitle(NotesListActivity.this
                             .getString(R.string.failed_sdcard_export));
@@ -866,17 +866,17 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }.execute();
     }
 
-    private boolean isSyncMode() {
+    private boolean isSyncMode() {//是否同步模式
         return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0;
     }
 
-    private void startPreferenceActivity() {
+    private void startPreferenceActivity() {//启动首选项活动
         Activity from = getParent() != null ? getParent() : this;
         Intent intent = new Intent(from, NotesPreferenceActivity.class);
         from.startActivityIfNeeded(intent, -1);
     }
 
-    private class OnListItemClickListener implements OnItemClickListener {
+    private class OnListItemClickListener implements OnItemClickListener {//列表项点击监听器
 
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
             if (view instanceof NotesListItem) {
@@ -890,8 +890,8 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                     return;
                 }
 
-                switch (mState) {
-                    case NOTE_LIST:
+                switch (mState) {//状态
+                    case NOTE_LIST://便签列表
                         if (item.getType() == Notes.TYPE_FOLDER
                                 || item.getType() == Notes.TYPE_SYSTEM) {
                             openFolder(item);
@@ -901,8 +901,8 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                             Log.e(TAG, "Wrong note type in NOTE_LIST");
                         }
                         break;
-                    case SUB_FOLDER:
-                    case CALL_RECORD_FOLDER:
+                    case SUB_FOLDER://子文件夹
+                    case CALL_RECORD_FOLDER://通话记录文件夹
                         if (item.getType() == Notes.TYPE_NOTE) {
                             openNode(item);
                         } else {
@@ -917,7 +917,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
     }
 
-    private void startQueryDestinationFolders() {
+    private void startQueryDestinationFolders() { //开始查询目标文件夹
         String selection = NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>? AND " + NoteColumns.ID + "<>?";
         selection = (mState == ListEditState.NOTE_LIST) ? selection:
             "(" + selection + ") OR (" + NoteColumns.ID + "=" + Notes.ID_ROOT_FOLDER + ")";
@@ -935,7 +935,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                 NoteColumns.MODIFIED_DATE + " DESC");
     }
 
-    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
+    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {//列表项长按监听器
         if (view instanceof NotesListItem) {
             mFocusNoteDataItem = ((NotesListItem) view).getItemData();
             if (mFocusNoteDataItem.getType() == Notes.TYPE_NOTE && !mNotesListAdapter.isInChoiceMode()) {
diff --git a/src/main/java/net/micode/notes/ui/NotesListAdapter.java b/src/main/java/net/micode/notes/ui/NotesListAdapter.java
index 51c9cb9..43f530b 100644
--- a/src/main/java/net/micode/notes/ui/NotesListAdapter.java
+++ b/src/main/java/net/micode/notes/ui/NotesListAdapter.java
@@ -31,19 +31,19 @@ import java.util.HashSet;
 import java.util.Iterator;
 
 
-public class NotesListAdapter extends CursorAdapter {
+public class NotesListAdapter extends CursorAdapter { // 该类扩展了 CursorAdapter 类
     private static final String TAG = "NotesListAdapter";
     private Context mContext;
     private HashMap<Integer, Boolean> mSelectedIndex;
     private int mNotesCount;
     private boolean mChoiceMode;
 
-    public static class AppWidgetAttribute {
+    public static class AppWidgetAttribute {  // 定义了一个静态内部类
         public int widgetId;
         public int widgetType;
     };
 
-    public NotesListAdapter(Context context) {
+    public NotesListAdapter(Context context) { // 构造函数
         super(context, null);
         mSelectedIndex = new HashMap<Integer, Boolean>();
         mContext = context;
@@ -51,12 +51,12 @@ public class NotesListAdapter extends CursorAdapter {
     }
 
     @Override
-    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+    public View newView(Context context, Cursor cursor, ViewGroup parent) { // 重写了 CursorAdapter 类的 newView() 方法
         return new NotesListItem(context);
     }
 
     @Override
-    public void bindView(View view, Context context, Cursor cursor) {
+    public void bindView(View view, Context context, Cursor cursor) {// 重写了 CursorAdapter 类的 bindView() 方法
         if (view instanceof NotesListItem) {
             NoteItemData itemData = new NoteItemData(context, cursor);
             ((NotesListItem) view).bind(context, itemData, mChoiceMode,
@@ -64,21 +64,21 @@ public class NotesListAdapter extends CursorAdapter {
         }
     }
 
-    public void setCheckedItem(final int position, final boolean checked) {
+    public void setCheckedItem(final int position, final boolean checked) { // 该方法用于设置选中的条目
         mSelectedIndex.put(position, checked);
         notifyDataSetChanged();
     }
 
     public boolean isInChoiceMode() {
         return mChoiceMode;
-    }
+    }// 该方法用于判断是否处于多选模式
 
-    public void setChoiceMode(boolean mode) {
+    public void setChoiceMode(boolean mode) {// 该方法用于设置多选模式
         mSelectedIndex.clear();
         mChoiceMode = mode;
     }
 
-    public void selectAll(boolean checked) {
+    public void selectAll(boolean checked) {// 该方法用于设置是否全选
         Cursor cursor = getCursor();
         for (int i = 0; i < getCount(); i++) {
             if (cursor.moveToPosition(i)) {
@@ -89,7 +89,7 @@ public class NotesListAdapter extends CursorAdapter {
         }
     }
 
-    public HashSet<Long> getSelectedItemIds() {
+    public HashSet<Long> getSelectedItemIds() {// 该方法用于获取选中的条目的 id
         HashSet<Long> itemSet = new HashSet<Long>();
         for (Integer position : mSelectedIndex.keySet()) {
             if (mSelectedIndex.get(position) == true) {
@@ -105,7 +105,7 @@ public class NotesListAdapter extends CursorAdapter {
         return itemSet;
     }
 
-    public HashSet<AppWidgetAttribute> getSelectedWidget() {
+    public HashSet<AppWidgetAttribute> getSelectedWidget() {// 该方法用于获取选中的条目的 widget
         HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
         for (Integer position : mSelectedIndex.keySet()) {
             if (mSelectedIndex.get(position) == true) {
@@ -128,12 +128,12 @@ public class NotesListAdapter extends CursorAdapter {
         return itemSet;
     }
 
-    public int getSelectedCount() {
+    public int getSelectedCount() {// 该方法用于获取选中的条目的数量
         Collection<Boolean> values = mSelectedIndex.values();
         if (null == values) {
             return 0;
         }
-        Iterator<Boolean> iter = values.iterator();
+        Iterator<Boolean> iter = values.iterator();// 该方法用于获取迭代器
         int count = 0;
         while (iter.hasNext()) {
             if (true == iter.next()) {
@@ -143,12 +143,12 @@ public class NotesListAdapter extends CursorAdapter {
         return count;
     }
 
-    public boolean isAllSelected() {
+    public boolean isAllSelected() {// 该方法用于判断是否全选
         int checkedCount = getSelectedCount();
         return (checkedCount != 0 && checkedCount == mNotesCount);
     }
 
-    public boolean isSelectedItem(final int position) {
+    public boolean isSelectedItem(final int position) {// 该方法用于判断是否选中
         if (null == mSelectedIndex.get(position)) {
             return false;
         }
@@ -156,23 +156,23 @@ public class NotesListAdapter extends CursorAdapter {
     }
 
     @Override
-    protected void onContentChanged() {
+    protected void onContentChanged() { // 重写了 CursorAdapter 类的 onContentChanged() 方法
         super.onContentChanged();
         calcNotesCount();
     }
 
     @Override
-    public void changeCursor(Cursor cursor) {
+    public void changeCursor(Cursor cursor) {// 重写了 CursorAdapter 类的 changeCursor() 方法
         super.changeCursor(cursor);
         calcNotesCount();
     }
 
-    private void calcNotesCount() {
+    private void calcNotesCount() { // 该方法用于计算条目的数量
         mNotesCount = 0;
         for (int i = 0; i < getCount(); i++) {
             Cursor c = (Cursor) getItem(i);
             if (c != null) {
-                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) {
+                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) {// 该方法用于获取条目的类型
                     mNotesCount++;
                 }
             } else {
diff --git a/src/main/java/net/micode/notes/ui/NotesListItem.java b/src/main/java/net/micode/notes/ui/NotesListItem.java
index 1221e80..a937c27 100644
--- a/src/main/java/net/micode/notes/ui/NotesListItem.java
+++ b/src/main/java/net/micode/notes/ui/NotesListItem.java
@@ -30,7 +30,7 @@ import net.micode.notes.tool.DataUtils;
 import net.micode.notes.tool.ResourceParser.NoteItemBgResources;
 
 
-public class NotesListItem extends LinearLayout {
+public class NotesListItem extends LinearLayout { // 继承自 LinearLayout 类
     private ImageView mAlert;
     private TextView mTitle;
     private TextView mTime;
@@ -38,7 +38,7 @@ public class NotesListItem extends LinearLayout {
     private NoteItemData mItemData;
     private CheckBox mCheckBox;
 
-    public NotesListItem(Context context) {
+    public NotesListItem(Context context) { // 构造函数
         super(context);
         inflate(context, R.layout.note_item, this);
         mAlert = (ImageView) findViewById(R.id.iv_alert_icon);
@@ -48,7 +48,7 @@ public class NotesListItem extends LinearLayout {
         mCheckBox = (CheckBox) findViewById(android.R.id.checkbox);
     }
 
-    public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) {
+    public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) { // 绑定数据
         if (choiceMode && data.getType() == Notes.TYPE_NOTE) {
             mCheckBox.setVisibility(View.VISIBLE);
             mCheckBox.setChecked(checked);
@@ -57,14 +57,14 @@ public class NotesListItem extends LinearLayout {
         }
 
         mItemData = data;
-        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果是通话记录文件夹
             mCallName.setVisibility(View.GONE);
             mAlert.setVisibility(View.VISIBLE);
             mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);
             mTitle.setText(context.getString(R.string.call_record_folder_name)
                     + context.getString(R.string.format_folder_files_count, data.getNotesCount()));
             mAlert.setImageResource(R.drawable.call_record);
-        } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) {
+        } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) {// 如果是通话记录
             mCallName.setVisibility(View.VISIBLE);
             mCallName.setText(data.getCallName());
             mTitle.setTextAppearance(context,R.style.TextAppearanceSecondaryItem);
@@ -75,7 +75,7 @@ public class NotesListItem extends LinearLayout {
             } else {
                 mAlert.setVisibility(View.GONE);
             }
-        } else {
+        } else { // 如果是笔记
             mCallName.setVisibility(View.GONE);
             mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);
 
@@ -94,12 +94,12 @@ public class NotesListItem extends LinearLayout {
                 }
             }
         }
-        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate()));
+        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate()));// 设置时间
 
         setBackground(data);
     }
 
-    private void setBackground(NoteItemData data) {
+    private void setBackground(NoteItemData data) {// 设置背景
         int id = data.getBgColorId();
         if (data.getType() == Notes.TYPE_NOTE) {
             if (data.isSingle() || data.isOneFollowingFolder()) {
diff --git a/src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java b/src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java
index 07c5f7e..e88d03c 100644
--- a/src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java
+++ b/src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java
@@ -48,20 +48,21 @@ import net.micode.notes.data.Notes.NoteColumns;
 import net.micode.notes.gtask.remote.GTaskSyncService;
 
 
-public class NotesPreferenceActivity extends PreferenceActivity {
-    public static final String PREFERENCE_NAME = "notes_preferences";
+public class NotesPreferenceActivity extends PreferenceActivity { // implements
+    public static final String PREFERENCE_NAME = "notes_preferences";// "notes_preferences";
 
-    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name";
+    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name";// "pref_key_account_name";
 
-    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time";
+    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time";// "pref_last_sync_time";
 
-    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";
+    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";// "pref_key_bg_random_appear";
 
-    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";
+    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";// "pref_sync_account_key";
 
-    private static final String AUTHORITIES_FILTER_KEY = "authorities";
+    private static final String AUTHORITIES_FILTER_KEY = "authorities";// "authorities";
 
-    private PreferenceCategory mAccountCategory;
+    private PreferenceCategory mAccountCategory;// = (PreferenceCategory)
+                                                // findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
 
     private GTaskReceiver mReceiver;
 
@@ -70,17 +71,17 @@ public class NotesPreferenceActivity extends PreferenceActivity {
     private boolean mHasAddedAccount;
 
     @Override
-    protected void onCreate(Bundle icicle) {
+    protected void onCreate(Bundle icicle) { //创建
         super.onCreate(icicle);
 
         /* using the app icon for navigation */
-        getActionBar().setDisplayHomeAsUpEnabled(true);
+        getActionBar().setDisplayHomeAsUpEnabled(true);//设置返回键
 
         addPreferencesFromResource(R.xml.preferences);
-        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);//获取PreferenceCategory
         mReceiver = new GTaskReceiver();
         IntentFilter filter = new IntentFilter();
-        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);//添加广播
         registerReceiver(mReceiver, filter);
 
         mOriAccounts = null;
@@ -89,14 +90,14 @@ public class NotesPreferenceActivity extends PreferenceActivity {
     }
 
     @Override
-    protected void onResume() {
+    protected void onResume() {//恢复
         super.onResume();
 
         // need to set sync account automatically if user has added a new
         // account
-        if (mHasAddedAccount) {
+        if (mHasAddedAccount) {//如果已经添加了账户
             Account[] accounts = getGoogleAccounts();
-            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {
+            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {//如果原来的账户不为空并且账户数大于原来的账户数
                 for (Account accountNew : accounts) {
                     boolean found = false;
                     for (Account accountOld : mOriAccounts) {
@@ -117,21 +118,21 @@ public class NotesPreferenceActivity extends PreferenceActivity {
     }
 
     @Override
-    protected void onDestroy() {
+    protected void onDestroy() {//销毁
         if (mReceiver != null) {
             unregisterReceiver(mReceiver);
         }
         super.onDestroy();
     }
 
-    private void loadAccountPreference() {
+    private void loadAccountPreference() {//加载账户
         mAccountCategory.removeAll();
 
         Preference accountPref = new Preference(this);
         final String defaultAccount = getSyncAccountName(this);
         accountPref.setTitle(getString(R.string.preferences_account_title));
         accountPref.setSummary(getString(R.string.preferences_account_summary));
-        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() { //点击事件
             public boolean onPreferenceClick(Preference preference) {
                 if (!GTaskSyncService.isSyncing()) {
                     if (TextUtils.isEmpty(defaultAccount)) {
@@ -151,15 +152,15 @@ public class NotesPreferenceActivity extends PreferenceActivity {
             }
         });
 
-        mAccountCategory.addPreference(accountPref);
+        mAccountCategory.addPreference(accountPref);  //添加账户
     }
 
-    private void loadSyncButton() {
+    private void loadSyncButton() { //加载同步按钮
         Button syncButton = (Button) findViewById(R.id.preference_sync_button);
         TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
 
         // set button state
-        if (GTaskSyncService.isSyncing()) {
+        if (GTaskSyncService.isSyncing()) {//如果正在同步
             syncButton.setText(getString(R.string.preferences_button_sync_cancel));
             syncButton.setOnClickListener(new View.OnClickListener() {
                 public void onClick(View v) {
@@ -167,22 +168,22 @@ public class NotesPreferenceActivity extends PreferenceActivity {
                 }
             });
         } else {
-            syncButton.setText(getString(R.string.preferences_button_sync_immediately));
+            syncButton.setText(getString(R.string.preferences_button_sync_immediately));//立即同步
             syncButton.setOnClickListener(new View.OnClickListener() {
                 public void onClick(View v) {
                     GTaskSyncService.startSync(NotesPreferenceActivity.this);
                 }
             });
         }
-        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));
+        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));//如果账户名不为空
 
         // set last sync time
-        if (GTaskSyncService.isSyncing()) {
+        if (GTaskSyncService.isSyncing()) {//如果正在同步
             lastSyncTimeView.setText(GTaskSyncService.getProgressString());
             lastSyncTimeView.setVisibility(View.VISIBLE);
         } else {
             long lastSyncTime = getLastSyncTime(this);
-            if (lastSyncTime != 0) {
+            if (lastSyncTime != 0) {//如果最后同步时间不为0
                 lastSyncTimeView.setText(getString(R.string.preferences_last_sync_time,
                         DateFormat.format(getString(R.string.preferences_last_sync_time_format),
                                 lastSyncTime)));
@@ -193,13 +194,13 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         }
     }
 
-    private void refreshUI() {
+    private void refreshUI() {//刷新UI
         loadAccountPreference();
         loadSyncButton();
     }
 
-    private void showSelectAccountAlertDialog() {
-        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+    private void showSelectAccountAlertDialog() {//显示选择账户对话框
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);//创建对话框
 
         View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
         TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
@@ -216,7 +217,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         mOriAccounts = accounts;
         mHasAddedAccount = false;
 
-        if (accounts.length > 0) {
+        if (accounts.length > 0) { //如果账户数大于0
             CharSequence[] items = new CharSequence[accounts.length];
             final CharSequence[] itemMapping = items;
             int checkedItem = -1;
@@ -227,7 +228,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
                 }
                 items[index++] = account.name;
             }
-            dialogBuilder.setSingleChoiceItems(items, checkedItem,
+            dialogBuilder.setSingleChoiceItems(items, checkedItem, //设置单选按钮
                     new DialogInterface.OnClickListener() {
                         public void onClick(DialogInterface dialog, int which) {
                             setSyncAccount(itemMapping[which].toString());
@@ -238,9 +239,9 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         }
 
         View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null);
-        dialogBuilder.setView(addAccountView);
+        dialogBuilder.setView(addAccountView);//设置视图
 
-        final AlertDialog dialog = dialogBuilder.show();
+        final AlertDialog dialog = dialogBuilder.show(); //显示对话框
         addAccountView.setOnClickListener(new View.OnClickListener() {
             public void onClick(View v) {
                 mHasAddedAccount = true;
@@ -254,7 +255,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         });
     }
 
-    private void showChangeAccountConfirmAlertDialog() {
+    private void showChangeAccountConfirmAlertDialog() { //显示更改账户确认对话框
         AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
 
         View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
@@ -270,7 +271,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
                 getString(R.string.preferences_menu_remove_account),
                 getString(R.string.preferences_menu_cancel)
         };
-        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {
+        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {//设置列表项
             public void onClick(DialogInterface dialog, int which) {
                 if (which == 0) {
                     showSelectAccountAlertDialog();
@@ -283,12 +284,12 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         dialogBuilder.show();
     }
 
-    private Account[] getGoogleAccounts() {
+    private Account[] getGoogleAccounts() {//获取谷歌账户
         AccountManager accountManager = AccountManager.get(this);
         return accountManager.getAccountsByType("com.google");
     }
 
-    private void setSyncAccount(String account) {
+    private void setSyncAccount(String account) {//设置同步账户
         if (!getSyncAccountName(this).equals(account)) {
             SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
             SharedPreferences.Editor editor = settings.edit();
@@ -318,7 +319,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         }
     }
 
-    private void removeSyncAccount() {
+    private void removeSyncAccount() {//移除同步账户
         SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
         SharedPreferences.Editor editor = settings.edit();
         if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) {
@@ -330,7 +331,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         editor.commit();
 
         // clean up local gtask related info
-        new Thread(new Runnable() {
+        new Thread(new Runnable() {//新建线程
             public void run() {
                 ContentValues values = new ContentValues();
                 values.put(NoteColumns.GTASK_ID, "");
@@ -340,13 +341,13 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         }).start();
     }
 
-    public static String getSyncAccountName(Context context) {
+    public static String getSyncAccountName(Context context) {//获取同步账户名
         SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
                 Context.MODE_PRIVATE);
         return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
     }
 
-    public static void setLastSyncTime(Context context, long time) {
+    public static void setLastSyncTime(Context context, long time) {//设置最后同步时间
         SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
                 Context.MODE_PRIVATE);
         SharedPreferences.Editor editor = settings.edit();
@@ -354,13 +355,13 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         editor.commit();
     }
 
-    public static long getLastSyncTime(Context context) {
+    public static long getLastSyncTime(Context context) {//获取最后同步时间
         SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
                 Context.MODE_PRIVATE);
         return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0);
     }
 
-    private class GTaskReceiver extends BroadcastReceiver {
+    private class GTaskReceiver extends BroadcastReceiver {//广播接收器
 
         @Override
         public void onReceive(Context context, Intent intent) {
@@ -374,7 +375,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         }
     }
 
-    public boolean onOptionsItemSelected(MenuItem item) {
+    public boolean onOptionsItemSelected(MenuItem item) {//选项菜单
         switch (item.getItemId()) {
             case android.R.id.home:
                 Intent intent = new Intent(this, NotesListActivity.class);