Circular Reveal Animation from https://guides.codepath.com/android/Circular-Reveal-Animation

reveal.java

//to reveal a previously invisible view using this effect:

void enterReveal() {
    // previously invisible view
    final View myView = findViewById(R.id.my_view);

    // get the center for the clipping circle
    int cx = myView.getMeasuredWidth() / 2;
    int cy = myView.getMeasuredHeight() / 2;

    // get the final radius for the clipping circle
    int finalRadius = Math.max(myView.getWidth(), myView.getHeight()) / 2;

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

    // make the view visible and start the animation
    myView.setVisibility(View.VISIBLE);
    anim.start();
}

//To hide a previously visible view using this effect:

void exitReveal() {
    // previously visible view
    final View myView = findViewById(R.id.my_view);

    // get the center for the clipping circle
    int cx = myView.getMeasuredWidth() / 2;
    int cy = myView.getMeasuredHeight() / 2;

    // get the initial radius for the clipping circle
    int initialRadius = myView.getWidth() / 2;

    // create the animation (the final radius is zero)
    Animator anim =
        ViewAnimationUtils.createCircularReveal(myView, 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);
            myView.setVisibility(View.INVISIBLE);
        }
    });

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

//View Transition

//You want to call enterReveal() after the enter transition of the activity has been completed.

private Transition.TransitionListener mEnterTransitionListener;

@Override
protected void onCreate(Bundle savedInstanceState) {

  ...

  mEnterTransitionListener = new Transition.TransitionListener() {
      @Override
      public void onTransitionStart(Transition transition) {

      }

      @Override
      public void onTransitionEnd(Transition transition) {
          enterReveal();
      }

      @Override
      public void onTransitionCancel(Transition transition) {

      }

      @Override
      public void onTransitionPause(Transition transition) {

      }

      @Override
      public void onTransitionResume(Transition transition) {

      }
  };
  getWindow().getEnterTransition().addListener(mEnterTransitionListener);
}

//Update enterReveal() method to remove this listener from the set listening to this animation. This is done to disable reveal animation when the activity ends.

private void enterReveal() {
    // previously invisible view
    final View myView = findViewById(R.id.my_view);

    // get the center for the clipping circle
    int cx = myView.getMeasuredWidth() / 2;
    int cy = myView.getMeasuredHeight() / 2;

    // get the final radius for the clipping circle
    int finalRadius = Math.max(myView.getWidth(), myView.getHeight()) / 2;
    Animator anim = ViewAnimationUtils.createCircularReveal(myView, cx, cy, 0, finalRadius);
    myView.setVisibility(View.VISIBLE);
    anim.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {

        }

        @Override
        public void onAnimationEnd(Animator animation) {
            getWindow().getEnterTransition().removeListener(mEnterTransitionListener);
        }

        @Override
        public void onAnimationCancel(Animator animation) {

        }

        @Override
        public void onAnimationRepeat(Animator animation) {

        }
    });
    anim.start();
}

While exiting the activity after the reveal transition, you want to finish the activity after completing the exit reveal animation.

anim.addListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            super.onAnimationEnd(animation);
            myView.setVisibility(View.INVISIBLE);

            // Finish the activity after the exit transition completes.
            supportFinishAfterTransition();
        }
    });

//To enable exit reveal transition on press of ActionBar up button or back button, call exitReveal() from onOptionsItemSelected() and onBackPressed() respectively.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        // Respond to the action bar's Up/Home button
        case android.R.id.home:
            exitReveal();
            return true;
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onBackPressed() {
    exitReveal();
}


//The reveal effect can be made to look more natural if it starts where the user tapped. To do this, you could get the x & y co-ordinates from the MotionEvent and use that to start the reveal effect.

@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
    if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
      // get the final radius for the clipping circle
      int finalRadius = Math.max(myView.getWidth(), myView.getHeight()) / 2;

      // create the animator for this view (the start radius is zero)
      Animator anim =
          ViewAnimationUtils.createCircularReveal(myView, (int) motionEvent.getX(), (int) motionEvent.getY(), 0, finalRadius);

      // make the view visible and start the animation
      myView.setVisibility(View.VISIBLE);
      anim.start();
    }
    return false;
}