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..47a1ebb 100644
--- a/app/src/main/java/net/micode/notes/model/WorkingNote.java
+++ b/app/src/main/java/net/micode/notes/model/WorkingNote.java
@@ -124,6 +124,9 @@ public class WorkingNote {
         loadNote();
     }
 
+    /**
+     * 通过查询指定ID的笔记数据，在Cursor中获取笔记的相关属性，并存储到相应的成员变量中
+     */
     private void loadNote() {
         Cursor cursor = mContext.getContentResolver().query(
                 ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mNoteId), NOTE_PROJECTION, null,
diff --git a/app/src/main/java/net/micode/notes/tool/BackupUtils.java b/app/src/main/java/net/micode/notes/tool/BackupUtils.java
index 39f6ec4..4617e99 100644
--- a/app/src/main/java/net/micode/notes/tool/BackupUtils.java
+++ b/app/src/main/java/net/micode/notes/tool/BackupUtils.java
@@ -311,6 +311,7 @@ public class BackupUtils {
 
     /**
      * Generate the text file to store imported data
+     * 生成一个存储在SD卡上的文件，并返回该文件对象
      */
     private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
         StringBuilder sb = new StringBuilder();
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 2fa42ce..752abcf 100644
--- a/app/src/main/java/net/micode/notes/ui/NotesListActivity.java
+++ b/app/src/main/java/net/micode/notes/ui/NotesListActivity.java
@@ -17,6 +17,7 @@
 package net.micode.notes.ui;
 
 import android.R.menu;
+import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
@@ -158,6 +159,10 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }
     }
 
+    /**
+     * 从raw资源文件中读取应用信息，保存到SharedPreferences中，
+     * 并在保存完成后将PREFERENCE_ADD_INTRODUCTION值设为true，以标识应用信息已经读取并保存。
+     */
     private void setAppInfoFromRawRes() {
         SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
         if (!sp.getBoolean(PREFERENCE_ADD_INTRODUCTION, false)) {
@@ -233,6 +238,9 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         mModeCallBack = new ModeCallback();
     }
 
+    /**
+     *处理ListView的多选模式下的操作
+     */
     private class ModeCallback implements ListView.MultiChoiceModeListener, OnMenuItemClickListener {
         private DropdownMenu mDropDownMenu;
         private ActionMode mActionMode;
@@ -498,6 +506,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         this.startActivityForResult(intent, REQUEST_CODE_NEW_NODE);
     }
 
+    @SuppressLint("StaticFieldLeak")
     private void batchDelete() {
         new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() {
             protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) {