随笔杂记

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);

}