系统音乐播放器暂停、播放的控制

转载自：http://blog.csdn.net/piaozhiye/article/details/6417318

今天在csdn上有问这个问题就研究下，正好自己的项目也需要用到，顺便做个记录。

来自android自带的music源码，下面是广播接收的代码，通过发送广播来控制音乐的播放，停止等。

代码如下：

  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);
         }
     }
 };

 

通过分析可以得出要暂停音乐可以有两种方法，一种是直接发送cmd，另外一种是发送action。

如下暂停音乐播放代码：

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

 

补充：启动事件为：

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