android 调节媒体音量

引用 AudioManager 对象

AudioManager audio = (AudioManager) getSystemService(Service.AUDIO_SERVICE);

重写 Activity 的 onKeyDown 方法

@Override  public boolean onKeyDown(int keyCode, KeyEvent event) {    switch (keyCode) {    case KeyEvent.KEYCODE_VOLUME_UP:        audio.adjustStreamVolume(            AudioManager.STREAM_MUSIC,            AudioManager.ADJUST_RAISE,            AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);        return true;    case KeyEvent.KEYCODE_VOLUME_DOWN:        audio.adjustStreamVolume(            AudioManager.STREAM_MUSIC,            AudioManager.ADJUST_LOWER,            AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);        return true;    default:        break;    }    return super.onKeyDown(keyCode, event);}