怎么拦截android手机下声音控制

如何拦截android手机上声音控制
一般android手机旁边有两个控制声音加、减的按钮，我现在的项目要求用户按了声音的加、减后拦截下来，把这两个命令用于别的用途，求大神解答~

[解决办法]
好像是这个，错了别喷我

Java code

@Overridepublic 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); }