MailsFragment.java 文件源码

@Override public void showContent() {
  super.showContent();
  if (createMailButton.getVisibility() != View.VISIBLE) {
    createMailButton.setVisibility(View.VISIBLE);

    if (!isRestoringViewState()) {
      PropertyValuesHolder holderX = PropertyValuesHolder.ofFloat("scaleX", 0, 1);
      PropertyValuesHolder holderY = PropertyValuesHolder.ofFloat("scaleY", 0, 1);
      ObjectAnimator animator =
          ObjectAnimator.ofPropertyValuesHolder(createMailButton, holderX, holderY);
      animator.setInterpolator(new OvershootInterpolator());
      animator.start();
    }
  }
}