diff --git a/app/src/main/java/com/example/musicplayer/app/Constant.java b/app/src/main/java/com/example/musicplayer/app/Constant.java
index 2c7b0db..e0cfaf0 100644
--- a/app/src/main/java/com/example/musicplayer/app/Constant.java
+++ b/app/src/main/java/com/example/musicplayer/app/Constant.java
@@ -1,82 +1,82 @@
 package com.example.musicplayer.app;
 
 /**
+ * 定义应用中使用的常量类。
  * Created by 残渊 on 2018/11/23.
  */
-
 public class Constant {
+    // 日志标签
     public static final String TAG = "jsyjst";
 
+    // 分页加载的偏移量
     public static final int OFFSET = 30;
+    // 类型常量，用于区分歌曲和专辑
     public static final int TYPE_SONG = 1;
     public static final int TYPE_ALBUM = 2;
 
-    //播放列表
-    public static final int LIST_TYPE_LOCAL = 1;   //本地列表
-    public static final int LIST_TYPE_ONLINE = 2;  //专辑列表
-    public static final int LIST_TYPE_LOVE = 3;    //我的收藏列表
-    public static final int LIST_TYPE_HISTORY = 4;  //最近播放列表
-    public static final int LIST_TYPE_DOWNLOAD = 5; //下载列表
+    // 播放列表类型
+    public static final int LIST_TYPE_LOCAL = 1;   // 本地列表
+    public static final int LIST_TYPE_ONLINE = 2;  // 专辑列表
+    public static final int LIST_TYPE_LOVE = 3;    // 我的收藏列表
+    public static final int LIST_TYPE_HISTORY = 4;  // 最近播放列表
+    public static final int LIST_TYPE_DOWNLOAD = 5; // 下载列表
 
+    // 搜索历史最大条目数
     public static final int HISTORY_MAX_SIZE = 100;
 
-
-    //布局
+    // 布局状态常量
     public static final int NORMAL_STATE = 0;
     public static final int LOADING_STATE = 1;
     public static final int ERROR_STATE = 2;
 
-    //playerStatus
+    // 播放器状态常量
     public static final String PLAYER_STATUS = "PlayerStatus";
     public static final int SONG_PLAY = 0;
     public static final int SONG_PAUSE = 1;
     public static final int SONG_RESUME = 2;
     public static final int SONG_CHANGE = 3;
 
-
-    //KEY
+    // 键值对常量
     public static final String ALBUM_ID_KEY = "id";
     public static final String ALBUM_NAME_KEY = "albumName";
     public static final String SINGER_NAME_KEY = "singerName";
     public static final String ALBUM_PIC_KEY = "albumPic";
     public static final String PUBLIC_TIME_KEY = "publicTime";
 
-
-    //TAG
+    // 错误标签
     public static final String TAG_ERROR = "error";
 
-    //网络与非网络歌曲
+    // 网络与非网络歌曲标识
     public static final int SONG_ONLINE = 0;
     public static final int SONG_LOCAL = 1;
 
-
-    //后缀
+    // 后缀常量
     public static final String LRC = ".lrc";
 
-    //音乐id
+    // 音乐id未找到标识
     public static final String SONG_ID_UNFIND = "unFind";
 
-    //播放顺序
-    public static final int PLAY_ORDER = 0;//顺序播放
-    public static final int PLAY_SINGLE = 1;//单曲循环
-    public static final int PLAY_RANDOM = 2;//随机播放
+    // 播放顺序常量
+    public static final int PLAY_ORDER = 0; // 顺序播放
+    public static final int PLAY_SINGLE = 1; // 单曲循环
+    public static final int PLAY_RANDOM = 2; // 随机播放
 
-    //Preferences
+    // Preferences常量
     public static final String SHARED_PREFERENCES_NAME = "prefs";
-    public static final String PREFS_PLAY_MODE = "play_mode";//播放状态
+    public static final String PREFS_PLAY_MODE = "play_mode"; // 播放模式
 
-    //download
+    // 下载状态常量
     public final static int TYPE_DOWNLOADING = 0;
     public final static int TYPE_DOWNLOAD_PAUSED = 1;
     public final static int TYPE_DOWNLOAD_CANCELED = 2;
     public final static int TYPE_DOWNLOAD_SUCCESS = 3;
     public final static int TYPE_DOWNLOAD_FAILED = 4;
     public final static int TYPE_DOWNLOADED = 5;
-    public final static int TYPE_DOWNLOAD_ADD=6;
+    public final static int TYPE_DOWNLOAD_ADD = 6;
 
-    //正在下载歌曲列表的状态
+    // 正在下载歌曲列表的状态常量
     public final static int DOWNLOAD_PAUSED = 0;
-    public final static int DOWNLOAD_WAIT=1;
-    public final static int DOWNLOAD_ING=2;
-    public final static int DOWNLOAD_READY=3;
-}
+    public final static int DOWNLOAD_WAIT = 1;
+    public final static int DOWNLOAD_ING = 2;
+    public final static int DOWNLOAD_READY = 3;
+}
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