diff --git a/app/src/main/java/net/micode/notes/data/Contact.java b/app/src/main/java/net/micode/notes/data/Contact.java
index d97ac5d..211de96 100644
--- a/app/src/main/java/net/micode/notes/data/Contact.java
+++ b/app/src/main/java/net/micode/notes/data/Contact.java
@@ -25,6 +25,9 @@ import android.util.Log;
 
 import java.util.HashMap;
 
+/**
+ * 联系人
+ */
 public class Contact {
     private static HashMap<String, String> sContactCache;
     private static final String TAG = "Contact";
@@ -36,17 +39,21 @@ public class Contact {
             + " FROM phone_lookup"
             + " WHERE min_match = '+')";
 
+    /**
+     * 获取联系人
+     */
     public static String getContact(Context context, String phoneNumber) {
         if(sContactCache == null) {
             sContactCache = new HashMap<String, String>();
         }
-
+        // 查找HashMap中是否已有phoneNumber信息
         if(sContactCache.containsKey(phoneNumber)) {
             return sContactCache.get(phoneNumber);
         }
 
         String selection = CALLER_ID_SELECTION.replace("+",
                 PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        // 查找数据库中phoneNumber的信息
         Cursor cursor = context.getContentResolver().query(
                 Data.CONTENT_URI,
                 new String [] { Phone.DISPLAY_NAME },
@@ -55,6 +62,7 @@ public class Contact {
                 null);
 
         if (cursor != null && cursor.moveToFirst()) {
+            // 找到相关信息
             try {
                 String name = cursor.getString(0);
                 sContactCache.put(phoneNumber, name);
diff --git a/app/src/main/java/net/micode/notes/data/Notes.java b/app/src/main/java/net/micode/notes/data/Notes.java
index f240604..92d2f23 100644
--- a/app/src/main/java/net/micode/notes/data/Notes.java
+++ b/app/src/main/java/net/micode/notes/data/Notes.java
@@ -165,7 +165,7 @@ public class Notes {
          * <P> Type : INTEGER (long) </P>
          */
         public static final String VERSION = "version";
-    }
+    } // 这些常量主要是定义便签的属性的
 
     public interface DataColumns {
         /**
diff --git a/app/src/main/java/net/micode/notes/data/NotesProvider.java b/app/src/main/java/net/micode/notes/data/NotesProvider.java
index edb0a60..540f9db 100644
--- a/app/src/main/java/net/micode/notes/data/NotesProvider.java
+++ b/app/src/main/java/net/micode/notes/data/NotesProvider.java
@@ -292,7 +292,7 @@ public class NotesProvider extends ContentProvider {
             }
             sql.append(selectString);
         }
-
+        // execSQL()方法可以执行insert、delete、update和CREATE TABLE之类有更改行为的SQL语句
         mHelper.getWritableDatabase().execSQL(sql.toString());
     }
 
diff --git a/app/src/main/java/net/micode/notes/gtask/data/Node.java b/app/src/main/java/net/micode/notes/gtask/data/Node.java
index 63950e0..040db8c 100644
--- a/app/src/main/java/net/micode/notes/gtask/data/Node.java
+++ b/app/src/main/java/net/micode/notes/gtask/data/Node.java
@@ -20,6 +20,9 @@ import android.database.Cursor;
 
 import org.json.JSONObject;
 
+/**
+ * 同步操作的基础数据类型，定义了相关指示同步操作的常量
+ */
 public abstract class Node {
     public static final int SYNC_ACTION_NONE = 0;
 
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..53fff0a 100644
--- a/app/src/main/java/net/micode/notes/model/Note.java
+++ b/app/src/main/java/net/micode/notes/model/Note.java
@@ -49,9 +49,9 @@ public class Note {
         values.put(NoteColumns.MODIFIED_DATE, createdTime);
         values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
         values.put(NoteColumns.LOCAL_MODIFIED, 1);
-        values.put(NoteColumns.PARENT_ID, folderId);
+        values.put(NoteColumns.PARENT_ID, folderId); // 将数据写入数据库表格
         Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
-
+        //ContentResolver()主要是实现外部应用对ContentProvider中的数据进行添加、删除、修改和查询操作
         long noteId = 0;
         try {
             noteId = Long.valueOf(uri.getPathSegments().get(1));
@@ -96,6 +96,10 @@ public class Note {
         mNoteData.setCallData(key, value);
     }
 
+    /**
+     * 判断是否是本地修改
+     * @return boolean
+     */
     public boolean isLocalModified() {
         return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
     }
@@ -131,6 +135,7 @@ public class Note {
     }
 
     private class NoteData {
+        // 定义一个基本的便签内容的数据类，主要包含文本数据和电话号码数据
         private long mTextDataId;
 
         private ContentValues mTextDataValues;
diff --git a/app/src/main/java/net/micode/notes/model/WorkingNote.java b/app/src/main/java/net/micode/notes/model/WorkingNote.java
index be081e4..4aeb154 100644
--- a/app/src/main/java/net/micode/notes/model/WorkingNote.java
+++ b/app/src/main/java/net/micode/notes/model/WorkingNote.java
@@ -189,7 +189,9 @@ public class WorkingNote {
 
     public synchronized boolean saveNote() {
         if (isWorthSaving()) {
+            // 是否值得保存
             if (!existInDatabase()) {
+                // 是否存在数据库中
                 if ((mNoteId = Note.getNewNoteId(mContext, mFolderId)) == 0) {
                     Log.e(TAG, "Create new note fail with id:" + mNoteId);
                     return false;
diff --git a/app/src/main/java/net/micode/notes/tool/ResourceParser.java b/app/src/main/java/net/micode/notes/tool/ResourceParser.java
index 1ad3ad6..b7b1aed 100644
--- a/app/src/main/java/net/micode/notes/tool/ResourceParser.java
+++ b/app/src/main/java/net/micode/notes/tool/ResourceParser.java
@@ -162,6 +162,9 @@ public class ResourceParser {
             R.style.TextAppearanceSuper
         };
 
+        /**
+         * 这里有一个容错的函数，防止输入的id大于资源总量，若如此，则自动返回默认的设置结果
+         */
         public static int getTexAppearanceResource(int id) {
             /**
              * HACKME: Fix bug of store the resource id in shared preference.
diff --git a/app/src/main/java/net/micode/notes/ui/NoteEditText.java b/app/src/main/java/net/micode/notes/ui/NoteEditText.java
index 2afe2a8..b884b10 100644
--- a/app/src/main/java/net/micode/notes/ui/NoteEditText.java
+++ b/app/src/main/java/net/micode/notes/ui/NoteEditText.java
@@ -37,6 +37,9 @@ import net.micode.notes.R;
 import java.util.HashMap;
 import java.util.Map;
 
+/**
+ * 设置便签设置文本框
+ */
 public class NoteEditText extends EditText {
     private static final String TAG = "NoteEditText";
     private int mIndex;
@@ -46,6 +49,7 @@ public class NoteEditText extends EditText {
     private static final String SCHEME_HTTP = "http:" ;
     private static final String SCHEME_EMAIL = "mailto:" ;
 
+    // 建立一个字符和整数的hash表，用于链接电话，网站，还有邮箱
     private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
     static {
         sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel);
@@ -111,9 +115,11 @@ public class NoteEditText extends EditText {
                 x += getScrollX();
                 y += getScrollY();
 
+                // 用布局控件layout根据x,y的新值设置新的位置
                 Layout layout = getLayout();
                 int line = layout.getLineForVertical(y);
                 int off = layout.getOffsetForHorizontal(line, x);
+                // 更新光标新的位置
                 Selection.setSelection(getText(), off);
                 break;
         }
@@ -167,6 +173,9 @@ public class NoteEditText extends EditText {
         return super.onKeyUp(keyCode, event);
     }
 
+    /**
+     * 当焦点发生变化时，会自动调用该方法来处理焦点改变的事件
+     */
     @Override
     protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
         if (mOnTextViewChangeListener != null) {
@@ -179,12 +188,17 @@ public class NoteEditText extends EditText {
         super.onFocusChanged(focused, direction, previouslyFocusedRect);
     }
 
+    /**
+     * 生成上下文菜单
+     */
     @Override
     protected void onCreateContextMenu(ContextMenu menu) {
         if (getText() instanceof Spanned) {
+            // 获取文本开始和结尾位置
             int selStart = getSelectionStart();
             int selEnd = getSelectionEnd();
 
+            // 获取开始到结尾的最大值和最小值
             int min = Math.min(selStart, selEnd);
             int max = Math.max(selStart, selEnd);
 
@@ -201,7 +215,7 @@ public class NoteEditText extends EditText {
                 if (defaultResId == 0) {
                     defaultResId = R.string.note_link_other;
                 }
-
+                // 建立菜单
                 menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
                         new OnMenuItemClickListener() {
                             public boolean onMenuItemClick(MenuItem item) {
@@ -212,6 +226,7 @@ public class NoteEditText extends EditText {
                         });
             }
         }
+        // 继续执行父类的其他菜单创建的事件
         super.onCreateContextMenu(menu);
     }
 }
diff --git a/app/src/main/java/net/micode/notes/ui/NotesListActivity.java b/app/src/main/java/net/micode/notes/ui/NotesListActivity.java
index 6db3761..832a07d 100644
--- a/app/src/main/java/net/micode/notes/ui/NotesListActivity.java
+++ b/app/src/main/java/net/micode/notes/ui/NotesListActivity.java
@@ -209,11 +209,15 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         startAsyncNotesListQuery();
     }
 
+    /**
+     * 初始化资源
+     */
     private void initResources() {
-        mContentResolver = this.getContentResolver();
+        mContentResolver = this.getContentResolver(); // 获取应用程序的数据，得到类似数据表的东西
         mBackgroundQueryHandler = new BackgroundQueryHandler(this.getContentResolver());
         mCurrentFolderId = Notes.ID_ROOT_FOLDER;
-        mNotesListView = (ListView) findViewById(R.id.notes_list);
+        // findViewById 是安卓编程的定位函数，主要是引用.R文件里的引用名
+        mNotesListView = (ListView) findViewById(R.id.notes_list); // 绑定XML中的ListView，作为Item的容器
         mNotesListView.addFooterView(LayoutInflater.from(this).inflate(R.layout.note_list_footer, null),
                 null, false);
         mNotesListView.setOnItemClickListener(new OnListItemClickListener());
@@ -269,6 +273,9 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             return true;
         }
 
+        /**
+         * 更新菜单
+         */
         private void updateMenu() {
             int selectedCount = mNotesListAdapter.getSelectedCount();
             // Update dropdown menu
@@ -805,6 +812,9 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         return true;
     }
 
+    /**
+     * 实现将便签导出到文本功能
+     */
     private void exportNoteToText() {
         final BackupUtils backup = BackupUtils.getInstance(NotesListActivity.this);
         new AsyncTask<Void, Void, Integer>() {
@@ -857,6 +867,9 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         from.startActivityIfNeeded(intent, -1);
     }
 
+    /**
+     * 实现对便签列表项的点击事件（短按）
+     */
     private class OnListItemClickListener implements OnItemClickListener {
 
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@@ -898,6 +911,9 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
     }
 
+    /**
+     * 查询目标文件
+     */
     private void startQueryDestinationFolders() {
         String selection = NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>? AND " + NoteColumns.ID + "<>?";
         selection = (mState == ListEditState.NOTE_LIST) ? selection:
@@ -916,6 +932,10 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                 NoteColumns.MODIFIED_DATE + " DESC");
     }
 
+    /**
+     * 如果长按的是便签，则通过ActionMode菜单实现；如果长按的是文件夹，则通过ContextMenu菜单实现；
+     * 具体ActionMOde菜单和ContextMenu菜单的详细见精度笔记
+     */
     public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
         if (view instanceof NotesListItem) {
             mFocusNoteDataItem = ((NotesListItem) view).getItemData();