监听音量键（转载）

监听音量键

  @Override

	public boolean onKeyDown(int keyCode, KeyEvent event) {
 
		if(keyCode==KeyEvent.KEYCODE_VOLUME_DOWN){
			myScrollBy(200);
			return true;
		}else if(keyCode==KeyEvent.KEYCODE_VOLUME_UP){
			myScrollBy(-200);
			return true;
		}else{
			return super.onKeyDown(keyCode, event);
		}
		
	}