android程式執行時按音量鍵調整多媒體音量

若按上下音量鍵無圖示時，檢查onkeydown方法是否有最後return false

要將預設調整鈴聲改為調整多媒體音量，可改(選其中一種)

1.oncreate方法中加入setVolumeControlStream(AudioManager.STREAM_MUSIC);

2.改onkeydown:

keyCode == KeyEvent.KEYCODE_VOLUME_UP

keyCode == KeyEvent.KEYCODE_VOLUME_DOWN

AudioManager.adjustStreamVolume

ex:

public boolean onKeyDown(final int pKeyCode, final KeyEvent pEvent) {

if(pKeyCode ==KeyEvent.KEYCODE_VOLUME_UP){

audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);

return true;

}

else if(pKeyCode == KeyEvent.KEYCODE_VOLUME_DOWN){

audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);

return true;

}

}