Android点击ImageButton时有“按下”的效果的实现

imageButton.setOnTouchListener(new OnTouchListener(){   
            @Override  
            public boolean onTouch(View v, MotionEvent event) {   
                if(event.getAction() == MotionEvent.ACTION_DOWN){   
                    //更改为按下时的背景图片   
                    v.setBackgroundResource(R.drawable.pressed);   
                }else if(event.getAction() == MotionEvent.ACTION_UP){   
                    //改为抬起时的图片   
                    v.setBackgroundResource(R.drawable.released);   
                }   
                return false;   
            }   
        });  

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;>