Centered circular reveal animator

gistfile1.java

@TargetApi(VERSION_CODES.LOLLIPOP)
private Animator createCenteredReveal(View view) {
  // Could optimize by reusing a temporary Rect instead of allocating a new one
  Rect bounds = new Rect();
  view.getDrawingRect(bounds);
  int centerX = bounds.centerX();
  int centerY = bounds.centerY();
  int finalRadius = Math.max(bounds.width(), bounds.height());
  return ViewAnimationUtils.createCircularReveal(view, centerX, centerY, 0f, finalRadius);
}

If you're ok sacrificing a little performance, you can also fix the timing with the following:

int width = bounds.width();
int height = bounds.height();
int finalRadius = (int) (Math.sqrt(width * width + height * height));