Final version of AnimationUtils

AnimationUtils.java

public class AnimationUtils {
  public interface AnimationFinishedListener {
    void onAnimationFinished();
  }

  public static int getMediumDuration(Context context) {
    int duration;
    if (isAnimationEnabled()) {
      duration = context.getResources().getInteger(android.R.integer.config_mediumAnimTime);
    } else {
      duration = 0;
    }
    return duration;
  }

  //For the Calabash tests we don't want to waste any time on animations!
  public static boolean isAnimationEnabled() {
    return !BuildConfig.OFFLINE_TESTING;
  }

  @ColorInt
  private static int getColor(Context context, @ColorRes int colorId) {
    return ContextCompat.getColor(context, colorId);
  }

  private static void registerCircularRevealAnimation(final Context context, final View view, final RevealAnimationSetting revealSettings, final int startColor, final int endColor, final AnimationFinishedListener listener) {
    if (isAnimationEnabled() && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      view.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
          v.removeOnLayoutChangeListener(this);

          int cx = revealSettings.getCenterX();
          int cy = revealSettings.getCenterY();
          int width = revealSettings.getWidth();
          int height = revealSettings.getHeight();

          //Simply use the diagonal of the view
          float finalRadius = (float) Math.sqrt(width * width + height * height);
          Animator anim = ViewAnimationUtils.createCircularReveal(v, cx, cy, 0, finalRadius);
          anim.setDuration(getMediumDuration(context));
          anim.setInterpolator(new FastOutSlowInInterpolator());
          anim.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
              listener.onAnimationFinished();
            }
          });
          anim.start();
          startBackgroundColorAnimation(view, startColor, endColor, getMediumDuration(context));
        }
      });
    } else {
      listener.onAnimationFinished();
    }
  }

  @TargetApi(Build.VERSION_CODES.LOLLIPOP)
  private static void startCircularRevealExitAnimation(Context context, final View view, RevealAnimationSetting revealSettings, int startColor, int endColor, final AnimationFinishedListener listener) {
    if (isAnimationEnabled() && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      int cx = revealSettings.getCenterX();
      int cy = revealSettings.getCenterY();
      int width = revealSettings.getWidth();
      int height = revealSettings.getHeight();

      float initRadius = (float) Math.sqrt(width * width + height * height);
      Animator anim = ViewAnimationUtils.createCircularReveal(view, cx, cy, initRadius, 0);
      anim.setDuration(getMediumDuration(context));
      anim.setInterpolator(new FastOutSlowInInterpolator());
      anim.addListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
          //Important: This will prevent the view's flashing (visible between the finished animation and the Fragment remove)
          view.setVisibility(View.GONE);
          listener.onAnimationFinished();
        }
      });
      anim.start();
      startBackgroundColorAnimation(view, startColor, endColor, getMediumDuration(context));
    } else {
      listener.onAnimationFinished();
    }
  }

  private static void startBackgroundColorAnimation(final View view, int startColor, int endColor, int duration) {
    ValueAnimator anim = new ValueAnimator();
    anim.setIntValues(startColor, endColor);
    anim.setEvaluator(new ArgbEvaluator());
    anim.setDuration(duration);
    anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator valueAnimator) {
        view.setBackgroundColor((Integer) valueAnimator.getAnimatedValue());
      }
    });
    anim.start();
  }

  //Specific cases for our share link screen
  
  public static void registerCreateShareLinkCircularRevealAnimation(Context context, View view, RevealAnimationSetting revealSettings, AnimationFinishedListener listener) {
    registerCircularRevealAnimation(context, view, revealSettings, getColor(context, R.color.prezi_blue), getColor(context, R.color.white), listener);
  }

  public static void startCreateShareLinkCircularRevealExitAnimation(Context context, View view, RevealAnimationSetting revealSettings, AnimationFinishedListener listener) {
    startCircularRevealExitAnimation(context, view, revealSettings, getColor(context, R.color.white), getColor(context, R.color.prezi_blue), listener);
  }
}