Android仿知乎日报开屏页效果

private void startAnimation() {    //位移动画，从底部滑出，Y方向移动,mHeight是底部布局的高度    ObjectAnimator translationAnimator= ObjectAnimator.ofFloat(rv_bottom, "translationY", mHeight, 0f);    //设置时长    translationAnimator.setDuration(1000);    //透明度渐变动画    ObjectAnimator alphaAnimatorator = ObjectAnimator.ofFloat(rv_bottom, "alpha", 0f,1f);    //设置时长    alphaAnimatorator.setDuration(2500);    //添加监听器，位移结束后，画圆弧开始    translationAnimator.addListener(new Animator.AnimatorListener() {      @Override      public void onAnimationStart(Animator animation) {      }      @Override      public void onAnimationEnd(Animator animation) {        zhview.startAnimation();      }      @Override      public void onAnimationCancel(Animator animation) {      }      @Override      public void onAnimationRepeat(Animator animation) {      }    });    AnimatorSet set = new AnimatorSet();    //两个动画一起执行    set.play(translationAnimator).with(alphaAnimatorator);    //go    set.start();  }