Android--点击 从左上角向右下角显示动画

   　　　TextView textView = (TextView)findViewById(R.id.textView);
        ImageView imageView1 = (ImageView) findViewById(R.id.imageView1);
        ImageView imageView2 = (ImageView) findViewById(R.id.imageView2);

        textView.setOnClickListener(viewOnClickListener);
        imageView1.setOnClickListener(viewOnClickListener);
        imageView2.setOnClickListener(viewOnClickListener);

    /*
    Animator createCircularReveal(View view, int centerX,
    int centerY, float startRadius, float endRadius)
    */
    View.OnClickListener viewOnClickListener = new View.OnClickListener(){
        @Override
        public void onClick(View v) {

            Animator animatorCircularReveal = ViewAnimationUtils.createCircularReveal(
                    v,
                    0,
                    0,
                    0,
                    (float) Math.hypot(v.getWidth(), v.getHeight()));
            animatorCircularReveal.setInterpolator(new AccelerateDecelerateInterpolator());

            animatorCircularReveal.start();

        }
    };

核心代码