android 按钮按下效果3

方法3、监听TouchEvent ，使用ColorFilter ：

定义两个数组：

public final float[] BTN_PRESSED = new float[] {
   2, 0, 0, 0, 2,
   0, 2, 0, 0, 2,
   0, 0, 2, 0, 2,
   0, 0, 0, 1, 0,
 };
 public final float[] BTN_NOPRESSED = new float[] {
   1, 0, 0, 0, 0,
   0, 1, 0, 0, 0,
   0, 0, 1, 0, 0,
   0, 0, 0, 1, 0,
 };

//在点击事件时处理

 private OnTouchListener mOnTouchListener = new OnTouchListener() {

  @Override
  public boolean onTouch(View v, MotionEvent event) {
   // TODO Auto-generated method stub
   if (MotionEvent.ACTION_DOWN == event.getAction()) {
    v.getBackground().setColorFilter(
      new ColorMatrixColorFilter(BTN_PRESSED ));
    v.setBackgroundDrawable(v.getBackground());
   } else {
    v.getBackground().setColorFilter(
      new ColorMatrixColorFilter(BTN_NOPRESSED ));
    v.setBackgroundDrawable(v.getBackground());
   }
   return false;
  }
 };

 

btn.setOnTouchListener(mOnTouchListener);