diff --git a/src/Notes/app/src/main/java/net/micode/notes/data/Contact.java b/src/Notes/app/src/main/java/net/micode/notes/data/Contact.java
index d97ac5d..12dfaf7 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/data/Contact.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/data/Contact.java
@@ -24,7 +24,7 @@ import android.telephony.PhoneNumberUtils;
 import android.util.Log;
 
 import java.util.HashMap;
-
+//联系人数据库
 public class Contact {
     private static HashMap<String, String> sContactCache;
     private static final String TAG = "Contact";
diff --git a/src/Notes/app/src/main/java/net/micode/notes/data/Notes.java b/src/Notes/app/src/main/java/net/micode/notes/data/Notes.java
index f240604..21c6019 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/data/Notes.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/data/Notes.java
@@ -17,6 +17,7 @@
 package net.micode.notes.data;
 
 import android.net.Uri;
+//便签数据库，用于记录便签相关属性和数据
 public class Notes {
     public static final String AUTHORITY = "micode_notes";
     public static final String TAG = "Notes";
diff --git a/src/Notes/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java b/src/Notes/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
index ffe5d57..5001465 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
@@ -26,7 +26,7 @@ import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.DataConstants;
 import net.micode.notes.data.Notes.NoteColumns;
 
-
+//数据库帮助类，用于辅助创建，处理数据库条目
 public class NotesDatabaseHelper extends SQLiteOpenHelper {
     private static final String DB_NAME = "note.db";
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/data/NotesProvider.java b/src/Notes/app/src/main/java/net/micode/notes/data/NotesProvider.java
index edb0a60..ad129a9 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/data/NotesProvider.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/data/NotesProvider.java
@@ -34,7 +34,7 @@ import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.NoteColumns;
 import net.micode.notes.data.NotesDatabaseHelper.TABLE;
 
-
+//便签信息提供类
 public class NotesProvider extends ContentProvider {
     private static final UriMatcher mMatcher;
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/MetaData.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/MetaData.java
index 3a2050b..a854fe9 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/MetaData.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/MetaData.java
@@ -24,7 +24,7 @@ import net.micode.notes.tool.GTaskStringUtils;
 import org.json.JSONException;
 import org.json.JSONObject;
 
-
+//关于同步任务的元数据
 public class MetaData extends Task {
     private final static String TAG = MetaData.class.getSimpleName();
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Node.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Node.java
index 63950e0..fbaa1c6 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Node.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Node.java
@@ -19,7 +19,7 @@ package net.micode.notes.gtask.data;
 import android.database.Cursor;
 
 import org.json.JSONObject;
-
+//同步任务的管理节点，用于设置，保存同步动作的信息
 public abstract class Node {
     public static final int SYNC_ACTION_NONE = 0;
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlData.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlData.java
index d3ec3be..18c42b7 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlData.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlData.java
@@ -34,7 +34,7 @@ import net.micode.notes.gtask.exception.ActionFailureException;
 import org.json.JSONException;
 import org.json.JSONObject;
 
-
+//数据库中基本数据，方法有：读取数据，获取数据库中数据，提交数据到数据库
 public class SqlData {
     private static final String TAG = SqlData.class.getSimpleName();
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java
index 79a4095..814b689 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java
@@ -37,7 +37,7 @@ import org.json.JSONObject;
 
 import java.util.ArrayList;
 
-
+//数据库中便签数据，方法包括读取便签内容，从数据库中获取便签数据，设置便签内容，从数据库中获取便签数据，设置便签内容，提交便签到数据库
 public class SqlNote {
     private static final String TAG = SqlNote.class.getSimpleName();
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Task.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Task.java
index 6a19454..786f92b 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Task.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/Task.java
@@ -31,7 +31,7 @@ import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
-
+//同步任务，将创建，更新，和同步动作封装成JSON对象，用本地和远程的JSON对结点内容进行设置，获取同步信息，进行本地和远程的同步。
 public class Task extends Node {
     private static final String TAG = Task.class.getSimpleName();
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/TaskList.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/TaskList.java
index 4ea21c5..78d2da0 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/data/TaskList.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/data/TaskList.java
@@ -29,7 +29,7 @@ import org.json.JSONObject;
 
 import java.util.ArrayList;
 
-
+//同步任务列表，将Task组织成同步任务列表进行管理
 public class TaskList extends Node {
     private static final String TAG = TaskList.class.getSimpleName();
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java
index 15504be..22fbf94 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java
@@ -15,7 +15,7 @@
  */
 
 package net.micode.notes.gtask.exception;
-
+//动作失败异常
 public class ActionFailureException extends RuntimeException {
     private static final long serialVersionUID = 4425249765923293627L;
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
index b08cfb1..c3458f3 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
@@ -15,7 +15,7 @@
  */
 
 package net.micode.notes.gtask.exception;
-
+//网络失败异常
 public class NetworkFailureException extends Exception {
     private static final long serialVersionUID = 2107610287180234136L;
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
index 440a871..1631e52 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
@@ -28,7 +28,7 @@ import net.micode.notes.R;
 import net.micode.notes.ui.NotesListActivity;
 import net.micode.notes.ui.NotesPreferenceActivity;
 
-
+//Gtask异步任务，方法包括任务同步和取消，显示同步任务的进程，通知和结果
 public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
 
     private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskClient.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskClient.java
index c67dfdf..9729bd2 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskClient.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskClient.java
@@ -60,7 +60,7 @@ import java.util.zip.GZIPInputStream;
 import java.util.zip.Inflater;
 import java.util.zip.InflaterInputStream;
 
-
+//GTask客户端，提供登陆GOOGLE账户，创建任务和任务列表，添加和删除结点，提交和重置，更新，获取任务列表等功能
 public class GTaskClient {
     private static final String TAG = GTaskClient.class.getSimpleName();
 
diff --git a/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java b/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java
index d2b4082..84a42ac 100644
--- a/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java
+++ b/src/Notes/app/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java
@@ -47,7 +47,7 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 
-
+//GTask管理，提供同步本地和远端的任务，初始化任务列表
 public class GTaskManager {
     private static final String TAG = GTaskManager.class.getSimpleName();