android 调节媒体音量

android 调节媒体音量

引用 AudioManager 对象

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

重写 Activity 的 onKeyDown 方法

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@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); }