系統音樂播放器暫停、播放的控制

轉載自：http://blog.csdn.net/piaozhiye/article/details/6417318

今天在csdn上有問這個問題就研究下，正好自己的項目也需要用到，順便做個記錄。

來自android自帶的music源碼，下面是廣播接收的代碼，通過發送廣播來控制音樂的播放，停止等。

代碼如下：

  public static final String PLAYSTATE_CHANGED = "com.android.music.playstatechanged";
 public static final String META_CHANGED = "com.android.music.metachanged";
 public static final String QUEUE_CHANGED = "com.android.music.queuechanged";
 public static final String PLAYBACK_COMPLETE = "com.android.music.playbackcomplete";
 public static final String ASYNC_OPEN_COMPLETE = "com.android.music.asyncopencomplete";
 public static final String SERVICECMD = "com.android.music.musicservicecommand";
 public static final String CMDNAME = "command";
 public static final String CMDTOGGLEPAUSE = "togglepause";
 public static final String CMDSTOP = "stop";
 public static final String CMDPAUSE = "pause";
 public static final String CMDPREVIOUS = "previous";
 public static final String CMDNEXT = "next";


private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
     @Override
     public void onReceive(Context context, Intent intent) {
         String action = intent.getAction();
         String cmd = intent.getStringExtra("command");
         if (CMDNEXT.equals(cmd) || NEXT_ACTION.equals(action)) {
             next(true);
         } else if (CMDPREVIOUS.equals(cmd) || PREVIOUS_ACTION.equals(action)) {
             prev();
         } else if (CMDTOGGLEPAUSE.equals(cmd) || TOGGLEPAUSE_ACTION.equals(action)) {
             if (isPlaying()) {
                 pause();
             } else {
                 play();
             }
         } else if (CMDPAUSE.equals(cmd) || PAUSE_ACTION.equals(action)) {
             pause();
         } else if (CMDSTOP.equals(cmd)) {
             pause();
             seek(0);
         } else if (MediaAppWidgetProvider.CMDAPPWIDGETUPDATE.equals(cmd)) {
             // Someone asked us to refresh a set of specific widgets, probably
             // because they were just added.
             int[] appWidgetIds = intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
             mAppWidgetProvider.performUpdate(MediaPlaybackService.this, appWidgetIds);
         }
     }
 };

 

通過分析可以得出要暫停音樂可以有兩種方法，一種是直接發送cmd，另外一種是發送action。

如下暫停音樂播放代碼：

private void pauseMusic() {
    Intent freshIntent = new Intent();
    freshIntent.setAction("com.android.music.musicservicecommand");
    freshIntent.putExtra("command", "pause");
    sendBroadcast(freshIntent);
}

 

補充：啓動事件爲：

 
  Intent freshIntent = new Intent();
    freshIntent.setAction("com.android.music.musicservicecommand");
    freshIntent.putExtra("command", "togglepause");
    sendBroadcast(freshIntent);