Why Reveal effect not working as per Developer blog

问题

I want to have Reveal Effect with in my app. I come to know about it for how it can be implemented. I got the information from the Andoid Developer Blog.

But when i have updated that with in my code, it is not showing any effect.

I have also try with Demo given by Google to demostrate Reveal effect. But it also not showing the effect. If there any permission i need to add or whats wrong i am doing?

My animator is as below:

View button = rootView.findViewById(R.id.button);
    final View shape = rootView.findViewById(R.id.circle);
    shape.setClipToOutline(false);
    shape.setVisibility(View.INVISIBLE);
    // Set a listener to reveal the view when clicked.
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            if(isShowing==false){
                // previously invisible view

                // get the center for the clipping circle
                int cx = (shape.getLeft() + shape.getRight()) / 2;
                int cy = (shape.getTop() + shape.getBottom()) / 2;

                // get the final radius for the clipping circle
                int finalRadius = Math.max(shape.getWidth(), shape.getHeight());

                // create the animator for this view (the start radius is zero)
                Animator anim =
                        ViewAnimationUtils.createCircularReveal(shape, cx, cy, 0, finalRadius);

                // make the view visible and start the animation
                shape.setVisibility(View.VISIBLE);
                anim.setDuration(4000);
                anim.start();
            }else{

                // get the center for the clipping circle
                int cx = (shape.getLeft() + shape.getRight()) / 2;
                int cy = (shape.getTop() + shape.getBottom()) / 2;

                // get the initial radius for the clipping circle
                int initialRadius = shape.getWidth();

                // create the animation (the final radius is zero)
                Animator anim =
                        ViewAnimationUtils.createCircularReveal(shape, cx, cy, initialRadius, 0);

                // make the view invisible when the animation is done
                anim.addListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        super.onAnimationEnd(animation);
                        shape.setVisibility(View.INVISIBLE);
                    }
                });

                anim.setDuration(4000);
                // start the animation
                anim.start();
            }

            isShowing = !isShowing;

    }
    });

Please let me know how to achieve this effect.

回答1:

Not everything that was introduced with Lollipop was backported. Reveal, ripple and elevation are some examples. The main reason is that some of them rely heavily on the new UI Thread introduced whit ART. You can find more info here, on the very bottom, in the faq section

来源：https://stackoverflow.com/questions/29071154/why-reveal-effect-not-working-as-per-developer-blog