diff --git a/.idea/.name b/.idea/.name
deleted file mode 100644
index 7efc0ae..0000000
--- a/.idea/.name
+++ /dev/null
@@ -1 +0,0 @@
-Notes-master
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 47f3303..9e8b972 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,8 +3,8 @@ apply plugin: 'com.android.application'
 android {
     useLibrary 'org.apache.http.legacy'
     namespace "net.micode.notes"
-    compileSdkVersion 33
-    buildToolsVersion "33.0.2"
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
 
     defaultConfig {
         applicationId "net.micode.notes"
diff --git a/app/read.md b/app/read.md
new file mode 100644
index 0000000..e69de29
diff --git a/app/src/main/java/net/micode/notes/gtask/data/MetaData.java b/app/src/main/java/net/micode/notes/gtask/data/MetaData.java
index 3a2050b..ff61c3b 100644
--- a/app/src/main/java/net/micode/notes/gtask/data/MetaData.java
+++ b/app/src/main/java/net/micode/notes/gtask/data/MetaData.java
@@ -4,7 +4,6 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- *
  *        http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
@@ -27,19 +26,24 @@ import org.json.JSONObject;
 
 public class MetaData extends Task {
     private final static String TAG = MetaData.class.getSimpleName();
-
+    //相关GTask任务的ID
     private String mRelatedGid = null;
 
+    //设置元数据,传入gid和元数据的JSONObject
     public void setMeta(String gid, JSONObject metaInfo) {
+        //向元数据中加入相关GTaskID
         try {
             metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
         } catch (JSONException e) {
             Log.e(TAG, "failed to put related gid");
         }
+        //设置笔记内容为元数据的JSON字符串
         setNotes(metaInfo.toString());
+        //设置笔记名称
         setName(GTaskStringUtils.META_NOTE_NAME);
     }
 
+    //获取相关GTask任务的ID
     public String getRelatedGid() {
         return mRelatedGid;
     }
@@ -49,11 +53,15 @@ public class MetaData extends Task {
         return getNotes() != null;
     }
 
+    //从远程同步的数据中获取内容
     @Override
     public void setContentByRemoteJSON(JSONObject js) {
+        //调用父类方法
         super.setContentByRemoteJSON(js);
+        //如果有笔记内容
         if (getNotes() != null) {
             try {
+                //解析笔记内容,获取相关GTask任务ID
                 JSONObject metaInfo = new JSONObject(getNotes().trim());
                 mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
             } catch (JSONException e) {
@@ -65,18 +73,20 @@ public class MetaData extends Task {
 
     @Override
     public void setContentByLocalJSON(JSONObject js) {
-        // this function should not be called
+        //此方法不应被调用,抛出异常
         throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
     }
 
     @Override
     public JSONObject getLocalJSONFromContent() {
+        //此方法不应被调用,抛出异常
         throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
     }
 
     @Override
     public int getSyncAction(Cursor c) {
+        //此方法不应被调用,抛出异常
         throw new IllegalAccessError("MetaData:getSyncAction should not be called");
     }
 
-}
+}
\ No newline at end of file
diff --git a/app/src/main/java/net/micode/notes/gtask/data/SqlData.java b/app/src/main/java/net/micode/notes/gtask/data/SqlData.java
index d3ec3be..2843a63 100644
--- a/app/src/main/java/net/micode/notes/gtask/data/SqlData.java
+++ b/app/src/main/java/net/micode/notes/gtask/data/SqlData.java
@@ -88,7 +88,7 @@ public class SqlData {
         loadFromCursor(c);
         mDiffDataValues = new ContentValues();
     }
-
+    //加载数据
     private void loadFromCursor(Cursor c) {
         mDataId = c.getLong(DATA_ID_COLUMN);
         mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
@@ -96,7 +96,11 @@ public class SqlData {
         mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
         mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
     }
-
+    /**
+     * 设置内容
+     * @param js JSON对象
+     * @throws JSONException
+     */
     public void setContent(JSONObject js) throws JSONException {
         long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
         if (mIsCreate || mDataId != dataId) {
@@ -129,7 +133,11 @@ public class SqlData {
         }
         mDataContentData3 = dataContentData3;
     }
-
+    /**
+     * 获取内容
+     * @return JSON对象
+     * @throws JSONException
+     */
     public JSONObject getContent() throws JSONException {
         if (mIsCreate) {
             Log.e(TAG, "it seems that we haven't created this in database yet");
@@ -144,6 +152,12 @@ public class SqlData {
         return js;
     }
 
+    /**
+     * 提交
+     * @param noteId 笔记ID
+     * @param validateVersion 是否校验版本
+     * @param version 版本
+     */
     public void commit(long noteId, boolean validateVersion, long version) {
 
         if (mIsCreate) {
diff --git a/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java b/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java
index 79a4095..abb272f 100644
--- a/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java
+++ b/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java
@@ -199,7 +199,9 @@ public class SqlNote {
         mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
         mVersion = c.getLong(VERSION_COLUMN);
     }
-
+    /**
+     * 加载数据内容
+     */
     private void loadDataContent() {
         Cursor c = null;
         mDataList.clear();
@@ -225,7 +227,11 @@ public class SqlNote {
                 c.close();
         }
     }
-
+    /**
+     * 设置内容
+     * @param js JSON对象
+     * @return 是否设置成功
+     */
     public boolean setContent(JSONObject js) {
         try {
             JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
@@ -358,7 +364,10 @@ public class SqlNote {
         }
         return true;
     }
-
+    /**
+     * 获取内容
+     * @return JSON对象
+     */
     public JSONObject getContent() {
         try {
             JSONObject js = new JSONObject();
@@ -439,7 +448,10 @@ public class SqlNote {
     public boolean isNoteType() {
         return mType == Notes.TYPE_NOTE;
     }
-
+    /**
+     * 提交
+     * @param validateVersion 是否校验版本
+     */
     public void commit(boolean validateVersion) {
         if (mIsCreate) {
             if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
diff --git a/app/src/main/java/net/micode/notes/gtask/data/Task.java b/app/src/main/java/net/micode/notes/gtask/data/Task.java
index 6a19454..ecb5b51 100644
--- a/app/src/main/java/net/micode/notes/gtask/data/Task.java
+++ b/app/src/main/java/net/micode/notes/gtask/data/Task.java
@@ -53,7 +53,11 @@ public class Task extends Node {
         mParent = null;
         mMetaInfo = null;
     }
-
+    /**
+     * 获取创建操作JSON对象
+     * @param actionId 操作ID
+     * @return JSON对象
+     */
     public JSONObject getCreateAction(int actionId) {
         JSONObject js = new JSONObject();
 
@@ -102,7 +106,11 @@ public class Task extends Node {
 
         return js;
     }
-
+    /**
+     * 获取更新操作JSON对象
+     * @param actionId 操作ID
+     * @return JSON对象
+     */
     public JSONObject getUpdateAction(int actionId) {
         JSONObject js = new JSONObject();
 
@@ -134,7 +142,10 @@ public class Task extends Node {
 
         return js;
     }
-
+    /**
+     * 根据远程JSON对象设置内容
+     * @param js JSON对象
+     */
     public void setContentByRemoteJSON(JSONObject js) {
         if (js != null) {
             try {
@@ -174,7 +185,10 @@ public class Task extends Node {
             }
         }
     }
-
+    /**
+     * 根据本地JSON对象设置内容
+     * @param js JSON对象
+     */
     public void setContentByLocalJSON(JSONObject js) {
         if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)
                 || !js.has(GTaskStringUtils.META_HEAD_DATA)) {
@@ -203,7 +217,10 @@ public class Task extends Node {
             e.printStackTrace();
         }
     }
-
+    /**
+     * 从内容获取本地JSON对象
+     * @return JSON对象
+     */
     public JSONObject getLocalJSONFromContent() {
         String name = getName();
         try {
@@ -246,7 +263,10 @@ public class Task extends Node {
             return null;
         }
     }
-
+    /**
+     * 设置元信息
+     * @param metaData 元数据
+     */
     public void setMetaInfo(MetaData metaData) {
         if (metaData != null && metaData.getNotes() != null) {
             try {
diff --git a/app/src/main/java/net/micode/notes/gtask/data/TaskList.java b/app/src/main/java/net/micode/notes/gtask/data/TaskList.java
index 4ea21c5..2810fad 100644
--- a/app/src/main/java/net/micode/notes/gtask/data/TaskList.java
+++ b/app/src/main/java/net/micode/notes/gtask/data/TaskList.java
@@ -42,7 +42,11 @@ public class TaskList extends Node {
         mChildren = new ArrayList<Task>();
         mIndex = 1;
     }
-
+    /**
+     * 获取创建操作JSON对象
+     * @param actionId 操作ID
+     * @return JSON对象
+     */
     public JSONObject getCreateAction(int actionId) {
         JSONObject js = new JSONObject();
 
@@ -73,7 +77,11 @@ public class TaskList extends Node {
 
         return js;
     }
-
+    /**
+     * 获取更新操作JSON对象
+     * @param actionId 操作ID
+     * @return JSON对象
+     */
     public JSONObject getUpdateAction(int actionId) {
         JSONObject js = new JSONObject();
 
@@ -102,7 +110,10 @@ public class TaskList extends Node {
 
         return js;
     }
-
+    /**
+     * 根据远程JSON对象设置内容
+     * @param js JSON对象
+     */
     public void setContentByRemoteJSON(JSONObject js) {
         if (js != null) {
             try {
@@ -128,7 +139,10 @@ public class TaskList extends Node {
             }
         }
     }
-
+    /**
+     * 根据本地JSON对象设置内容
+     * @param js JSON对象
+     */
     public void setContentByLocalJSON(JSONObject js) {
         if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) {
             Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
@@ -156,7 +170,10 @@ public class TaskList extends Node {
             e.printStackTrace();
         }
     }
-
+    /**
+     * 从内容获取本地JSON对象
+     * @return JSON对象
+     */
     public JSONObject getLocalJSONFromContent() {
         try {
             JSONObject js = new JSONObject();
@@ -182,7 +199,11 @@ public class TaskList extends Node {
             return null;
         }
     }
-
+    /**
+     * 获取同步操作
+     * @param c Cursor
+     * @return 同步操作
+     */
     public int getSyncAction(Cursor c) {
         try {
             if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
@@ -215,11 +236,18 @@ public class TaskList extends Node {
 
         return SYNC_ACTION_ERROR;
     }
-
+    /**
+     * 获取子任务数
+     * @return 子任务数
+     */
     public int getChildTaskCount() {
         return mChildren.size();
     }
-
+    /**
+     * 添加子任务
+     * @param task 子任务
+     * @return 是否成功
+     */
     public boolean addChildTask(Task task) {
         boolean ret = false;
         if (task != null && !mChildren.contains(task)) {
@@ -233,7 +261,12 @@ public class TaskList extends Node {
         }
         return ret;
     }
-
+    /**
+     * 在指定位置添加子任务
+     * @param task 子任务
+     * @param index 位置
+     * @return 是否成功
+     */
     public boolean addChildTask(Task task, int index) {
         if (index < 0 || index > mChildren.size()) {
             Log.e(TAG, "add child task: invalid index");
@@ -259,7 +292,11 @@ public class TaskList extends Node {
 
         return true;
     }
-
+    /**
+     * 移除子任务
+     * @param task 子任务
+     * @return 是否成功
+     */
     public boolean removeChildTask(Task task) {
         boolean ret = false;
         int index = mChildren.indexOf(task);
@@ -280,7 +317,12 @@ public class TaskList extends Node {
         }
         return ret;
     }
-
+    /**
+     * 移动子任务位置
+     * @param task 子任务
+     * @param index 目标位置
+     * @return 是否成功
+     */
     public boolean moveChildTask(Task task, int index) {
 
         if (index < 0 || index >= mChildren.size()) {
@@ -298,7 +340,11 @@ public class TaskList extends Node {
             return true;
         return (removeChildTask(task) && addChildTask(task, index));
     }
-
+    /**
+     * 根据GID查找子任务
+     * @param gid GID
+     * @return 子任务
+     */
     public Task findChildTaskByGid(String gid) {
         for (int i = 0; i < mChildren.size(); i++) {
             Task t = mChildren.get(i);
@@ -308,11 +354,19 @@ public class TaskList extends Node {
         }
         return null;
     }
-
+    /**
+     * 获取子任务位置
+     * @param task 子任务
+     * @return 位置
+     */
     public int getChildTaskIndex(Task task) {
         return mChildren.indexOf(task);
     }
-
+    /**
+     * 根据位置获取子任务
+     * @param index 位置
+     * @return 子任务
+     */
     public Task getChildTaskByIndex(int index) {
         if (index < 0 || index >= mChildren.size()) {
             Log.e(TAG, "getTaskByIndex: invalid index");
@@ -320,7 +374,11 @@ public class TaskList extends Node {
         }
         return mChildren.get(index);
     }
-
+    /**
+     * 根据GID获取子任务
+     * @param gid GID
+     * @return 子任务
+     */
     public Task getChilTaskByGid(String gid) {
         for (Task task : mChildren) {
             if (task.getGid().equals(gid))
diff --git a/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java b/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java
index 15504be..302323b 100644
--- a/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java
+++ b/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java
@@ -15,7 +15,9 @@
  */
 
 package net.micode.notes.gtask.exception;
-
+/**
+ * 操作失败异常
+ */
 public class ActionFailureException extends RuntimeException {
     private static final long serialVersionUID = 4425249765923293627L;
 
@@ -26,7 +28,11 @@ public class ActionFailureException extends RuntimeException {
     public ActionFailureException(String paramString) {
         super(paramString);
     }
-
+    /**
+     * 构造方法
+     * @param paramString 异常信息
+     * @param paramThrowable 引起该异常的异常
+     */
     public ActionFailureException(String paramString, Throwable paramThrowable) {
         super(paramString, paramThrowable);
     }
diff --git a/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java b/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
index b08cfb1..2b4cf25 100644
--- a/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
+++ b/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
@@ -15,7 +15,9 @@
  */
 
 package net.micode.notes.gtask.exception;
-
+/**
+ * 网络异常
+ */
 public class NetworkFailureException extends Exception {
     private static final long serialVersionUID = 2107610287180234136L;
 
@@ -26,7 +28,11 @@ public class NetworkFailureException extends Exception {
     public NetworkFailureException(String paramString) {
         super(paramString);
     }
-
+    /**
+     * 构造方法
+     * @param paramString 异常信息
+     * @param paramThrowable 引起该异常的异常
+     */
     public NetworkFailureException(String paramString, Throwable paramThrowable) {
         super(paramString, paramThrowable);
     }
diff --git a/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java b/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
index 97123d0..582e730 100644
--- a/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
+++ b/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
@@ -27,7 +27,10 @@ import android.os.AsyncTask;
 import net.micode.notes.R;
 import net.micode.notes.ui.NotesListActivity;
 import net.micode.notes.ui.NotesPreferenceActivity;
-
+/**
+ * GTask异步任务
+ *
+ */
 
 public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
 
@@ -44,7 +47,11 @@ public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
     private GTaskManager mTaskManager;
 
     private OnCompleteListener mOnCompleteListener;
-
+    /**
+     * 构造方法
+     * @param context 上下文
+     * @param listener 完成监听器
+     */
     public GTaskASyncTask(Context context, OnCompleteListener listener) {
         mContext = context;
         mOnCompleteListener = listener;
@@ -52,17 +59,25 @@ public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
                 .getSystemService(Context.NOTIFICATION_SERVICE);
         mTaskManager = GTaskManager.getInstance();
     }
-
-    public void cancelSync() {
+    /**
+     * 取消同步操作
+     */       public void cancelSync() {
         mTaskManager.cancelSync();
     }
-
+    /**
+     * 发布进度
+     * @param message 消息
+     */
     public void publishProgess(String message) {
         publishProgress(new String[] {
             message
         });
     }
-
+    /**
+     * 显示通知
+     * @param tickerId 通知ID
+     * @param content 内容
+     */
     private void showNotification(int tickerId, String content) {
         Notification notification = new Notification(R.drawable.notification, mContext
                 .getString(tickerId), System.currentTimeMillis());
diff --git a/app/src/main/java/net/micode/notes/model/Note.java b/app/src/main/java/net/micode/notes/model/Note.java
index 6706cf6..34227f6 100644
--- a/app/src/main/java/net/micode/notes/model/Note.java
+++ b/app/src/main/java/net/micode/notes/model/Note.java
@@ -14,6 +14,17 @@
  * limitations under the License.
  */
 
+/**
+ * 1. Note类代表一个便签,它包含两部分数据:
+ * - mNoteDiffValues:便签的基本信息,如标题、创建时间等,存储在SQLite中的notes表
+ * - mNoteData:便签的文本内容或通话记录等详细数据,存储在SQLite中的data表
+ * 2. Note类提供了许多方法来设置mNoteDiffValues和mNoteData,以更新便签信息和详细数据。
+ * 3. Note类的syncNote方法用来同步便签信息和详细数据到数据库。它会先更新notes表,然后插入或更新data表中的详细数据。
+ * 4. NoteData类表示详细数据,它包含文本数据(存储在mTextDataValues)和通话记录数据(存储在mCallDataValues)。
+ * 5. NoteData类也提供了许多方法来设置文本数据和通话记录数据到mTextDataValues和mCallDataValues。
+ * 6. NoteData类的pushIntoContentResolver方法会将mTextDataValues和mCallDataValues中的数据插入或更新到data表中。
+ */
+
 package net.micode.notes.model;
 import android.content.ContentProviderOperation;
 import android.content.ContentProviderResult;
@@ -41,6 +52,13 @@ public class Note {
     /**
      * Create a new note id for adding a new note to databases
      */
+    /**
+     * 获取新便签ID
+     *
+     * @param context 上下文
+     * @param folderId 文件夹ID
+     * @return 新便签ID
+     */
     public static synchronized long getNewNoteId(Context context, long folderId) {
         // Create a new note in the database
         ContentValues values = new ContentValues();
@@ -70,24 +88,49 @@ public class Note {
         mNoteData = new NoteData();
     }
 
+    /**
+     * 设置便签值
+     *
+     * @param key 键
+     * @param value 值
+     */
     public void setNoteValue(String key, String value) {
         mNoteDiffValues.put(key, value);
         mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
         mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
     }
 
+    /**
+     * 设置文本数据
+     *
+     * @param key 键
+     * @param value 值
+     */
     public void setTextData(String key, String value) {
         mNoteData.setTextData(key, value);
     }
-
+    /**
+     * 设置文本数据ID
+     *
+     * @param id ID
+     */
     public void setTextDataId(long id) {
         mNoteData.setTextDataId(id);
     }
-
+    /**
+     * 设置通话数据ID
+     *
+     * @param id ID
+     */
     public long getTextDataId() {
         return mNoteData.mTextDataId;
     }
-
+    /**
+     * 设置通话数据
+     *
+     * @param key 键
+     * @param value 值
+     */
     public void setCallDataId(long id) {
         mNoteData.setCallDataId(id);
     }
@@ -95,11 +138,17 @@ public class Note {
     public void setCallData(String key, String value) {
         mNoteData.setCallData(key, value);
     }
-
+    /**是否本地修改*/
     public boolean isLocalModified() {
         return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
     }
-
+    /**
+     * 同步便签
+     *
+     * @param context 上下文
+     * @param noteId  便签ID
+     * @return 是否同步成功
+     */
     public boolean syncNote(Context context, long noteId) {
         if (noteId <= 0) {
             throw new IllegalArgumentException("Wrong note id:" + noteId);