声明：只做收集，并非原创

• <h3>缩放动画</h3>
  @NonNull
  private AnimationSet getAnimationSet() {
  AnimationSet set = new AnimationSet(true);
  AlphaAnimation alphaAnim = new AlphaAnimation(0.5f, 1.0f);
  set.addAnimation(alphaAnim);

    ScaleAnimation scaleAnim = new ScaleAnimation(1.0f, 1.5f, 1.0f, 1.5f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    set.addAnimation(scaleAnim);
    set.setFillAfter(true);
    set.setDuration(2500);
  
    set.setAnimationListener(new Animation.AnimationListener() {
        @Override
        public void onAnimationStart(Animation animation) {
        }
  
        @Override
        public void onAnimationEnd(Animation animation) {
            //这里是动画的监听
        }
  
        @Override
        public void onAnimationRepeat(Animation animation) {
        }
    });
    return set;
  

  }
  直接view.startAnimation(set)
  AnimationSet set = getAnimationSet();
  findViewById(R.id.splash).startAnimation(set);

• 向四周伸张，直到完成显示

  @SuppressLint("NewApi")
  public static void showAsCircular(View myView, float startRadius, long durationMills) {
    if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) {
        myView.setVisibility(View.VISIBLE);
        return;
    }
    int cx = (myView.getLeft() + myView.getRight()) / 2;
    int cy = (myView.getTop() + myView.getBottom()) / 2;
  
    int w = myView.getWidth();
    int h = myView.getHeight();
  
    // 勾股定理 & 进一法
    int finalRadius = (int) Math.sqrt(w * w + h * h) + 1;
    Animator anim =
            ViewAnimationUtils.createCircularReveal(myView, cx, cy, startRadius, finalRadius);
    myView.setVisibility(View.VISIBLE);
    anim.setDuration(durationMills);
    anim.start();
  }
  

调用：
public static final long PERFECT_MILLS = 618;
public static final int MINI_RADIUS = 0;
showAsCircular(myView, MINI_RADIUS, PERFECT_MILLS);

• 由满向中间收缩，直到隐藏
  @SuppressLint("NewApi")
  public static void hideAsCircular(final View myView, float endRadius, long durationMills) {
  if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) {
  myView.setVisibility(View.INVISIBLE);
  return;
  }

    int cx = (myView.getLeft() + myView.getRight()) / 2;
    int cy = (myView.getTop() + myView.getBottom()) / 2;
    int w = myView.getWidth();
    int h = myView.getHeight();
  
    // 勾股定理 & 进一法
    int initialRadius = (int) Math.sqrt(w * w + h * h) + 1;
  
    Animator anim =
            ViewAnimationUtils.createCircularReveal(myView, cx, cy, initialRadius, endRadius);
    anim.setDuration(durationMills);
    anim.addListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            super.onAnimationEnd(animation);
            myView.setVisibility(View.INVISIBLE);
        }
    });
  
    anim.start();
  }
  

调用：
hideAsCircular(myView, MINI_RADIUS, PERFECT_MILLS);
效果：

1.gif