以下code将暂停一个默认的MediaPlayer通过发送一个广播：

The following code will pause a default MediaPlayer by sending a broadcast:

AudioManager mAudioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);    

if (mAudioManager.isMusicActive()) {

    Intent i = new Intent("com.android.music.musicservicecommand");

    i.putExtra("command", "pause");
    YourApplicationClass.this.sendBroadcast(i);
}