private long eventtime = 0; private AudioManager vAudioManager = null;  //此處在onCreate方法中初始化  eventtime = SystemClock.uptimeMillis(); vAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); //這是播放或者暫停 if (vAudioManager.isMusicActive()){  Toast.makeText(getApplicationContext(), "有音樂在播放---暫停", Toast.LENGTH_SHORT).show();  pauseMusic();//暫停 }else {  Toast.makeText(getApplicationContext(), "無音樂在播放--開始", Toast.LENGTH_SHORT).show();  playMusic();//播放 }

 /** * 暫停 */private void pauseMusic() { if (eventtime<=0)return; Intent downIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent downEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PAUSE, 0); downIntent.putExtra(Intent.EXTRA_KEY_EVENT, downEvent); sendOrderedBroadcast(downIntent, null); Intent upIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent upEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PAUSE, 0); upIntent.putExtra(Intent.EXTRA_KEY_EVENT, upEvent); sendOrderedBroadcast(upIntent, null);}/** * 播放 */private void playMusic() { if (eventtime<=0)return; Intent downIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent downEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY, 0); downIntent.putExtra(Intent.EXTRA_KEY_EVENT, downEvent); sendOrderedBroadcast(downIntent, null); Intent upIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent upEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PLAY, 0); upIntent.putExtra(Intent.EXTRA_KEY_EVENT, upEvent); sendOrderedBroadcast(upIntent, null);}/** * 上一曲 */private void lastMusic() { if (eventtime<=0)return; Intent downIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent downEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PREVIOUS, 0); downIntent.putExtra(Intent.EXTRA_KEY_EVENT, downEvent); sendOrderedBroadcast(downIntent, null); Intent upIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent upEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PREVIOUS, 0); upIntent.putExtra(Intent.EXTRA_KEY_EVENT, upEvent); sendOrderedBroadcast(upIntent, null);}/** * 下一曲 */private void nextMusic() { if (eventtime<=0)return; Intent downIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent downEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_NEXT, 0); downIntent.putExtra(Intent.EXTRA_KEY_EVENT, downEvent); sendOrderedBroadcast(downIntent, null); Intent upIntent = new Intent(Intent.ACTION_MEDIA_BUTTON, null); KeyEvent upEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_NEXT, 0); upIntent.putExtra(Intent.EXTRA_KEY_EVENT, upEvent); sendOrderedBroadcast(upIntent, null);}

 // 調(diào)低音量 vAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI); // 調(diào)高音量 vAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);