Example of Reveal animations on Android 5.0-优快云博客

本文介绍了一种YouTube风格的视频播放动画实现方法，通过创建圆形裁剪效果来展示或隐藏视图，包括获取裁剪圆心位置、设置初始及最终半径，并使用Animator进行动画效果的实现。

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仿youtobe播放视频时开场动画

 // To reveal a previously invisible view using this effect: 
 
 private 
  void 
  show( 
 final 
  View view) { 
 
 // get the center for the clipping circle 
 
 int 
  cx = (view.getLeft() + view.getRight()) /  
 2 
 ; 
 
 int 
  cy = (view.getTop() + view.getBottom()) /  
 2 
 ; 

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

 // create the animator for this view (the start radius is zero) 
 
 Animator anim = ViewAnimationUtils.createCircularReveal(view, cx, cy, 
 
 0 
 , finalRadius); 
 
 anim.setDuration( 
 1000 
 ); 

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

 // To hide a previously visible view using this effect: 
 
 private 
  void 
  hide( 
 final 
  View view) { 

 // get the center for the clipping circle 
 
 int 
  cx = (view.getLeft() + view.getRight()) /  
 2 
 ; 
 
 int 
  cy = (view.getTop() + view.getBottom()) /  
 2 
 ; 

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

 // create the animation (the final radius is zero) 
 
 Animator anim = ViewAnimationUtils.createCircularReveal(view, cx, cy, 
 
 initialRadius,  
 0 
 ); 
 
 anim.setDuration( 
 1000 
 ); 

 // make the view invisible when the animation is done 
 
 anim.addListener( 
 new 
  AnimatorListenerAdapter() { 
 
 @Override 
 
 public 
  void 
  onAnimationEnd(Animator animation) { 
 
 super 
 .onAnimationEnd(animation); 
 
 view.setVisibility(View.INVISIBLE); 
 
 } 
 
 }); 

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