NearbyConnectionsWalkieTalkie/app/src/manual/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [438:480]:
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  private Animator createAnimator(boolean reverse) {
    Animator animator;
    if (Build.VERSION.SDK_INT >= 21) {
      int cx = mCurrentStateView.getMeasuredWidth() / 2;
      int cy = mCurrentStateView.getMeasuredHeight() / 2;
      int initialRadius = 0;
      int finalRadius = Math.max(mCurrentStateView.getWidth(), mCurrentStateView.getHeight());
      if (reverse) {
        int temp = initialRadius;
        initialRadius = finalRadius;
        finalRadius = temp;
      }
      animator =
          ViewAnimationUtils.createCircularReveal(
              mCurrentStateView, cx, cy, initialRadius, finalRadius);
    } else {
      float initialAlpha = 0f;
      float finalAlpha = 1f;
      if (reverse) {
        float temp = initialAlpha;
        initialAlpha = finalAlpha;
        finalAlpha = temp;
      }
      mCurrentStateView.setAlpha(initialAlpha);
      animator = ObjectAnimator.ofFloat(mCurrentStateView, "alpha", finalAlpha);
    }
    animator.addListener(
        new AnimatorListener() {
          @Override
          public void onAnimationCancel(Animator animator) {
            mPreviousStateView.setVisibility(View.GONE);
            mCurrentStateView.setAlpha(1);
          }

          @Override
          public void onAnimationEnd(Animator animator) {
            mPreviousStateView.setVisibility(View.GONE);
            mCurrentStateView.setAlpha(1);
          }
        });
    animator.setDuration(ANIMATION_DURATION);
    return animator;
  }
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NearbyConnectionsWalkieTalkie/app/src/automatic/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [377:419]:
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  private Animator createAnimator(boolean reverse) {
    Animator animator;
    if (Build.VERSION.SDK_INT >= 21) {
      int cx = mCurrentStateView.getMeasuredWidth() / 2;
      int cy = mCurrentStateView.getMeasuredHeight() / 2;
      int initialRadius = 0;
      int finalRadius = Math.max(mCurrentStateView.getWidth(), mCurrentStateView.getHeight());
      if (reverse) {
        int temp = initialRadius;
        initialRadius = finalRadius;
        finalRadius = temp;
      }
      animator =
          ViewAnimationUtils.createCircularReveal(
              mCurrentStateView, cx, cy, initialRadius, finalRadius);
    } else {
      float initialAlpha = 0f;
      float finalAlpha = 1f;
      if (reverse) {
        float temp = initialAlpha;
        initialAlpha = finalAlpha;
        finalAlpha = temp;
      }
      mCurrentStateView.setAlpha(initialAlpha);
      animator = ObjectAnimator.ofFloat(mCurrentStateView, "alpha", finalAlpha);
    }
    animator.addListener(
        new AnimatorListener() {
          @Override
          public void onAnimationCancel(Animator animator) {
            mPreviousStateView.setVisibility(View.GONE);
            mCurrentStateView.setAlpha(1);
          }

          @Override
          public void onAnimationEnd(Animator animator) {
            mPreviousStateView.setVisibility(View.GONE);
            mCurrentStateView.setAlpha(1);
          }
        });
    animator.setDuration(ANIMATION_DURATION);
    return animator;
  }
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