发布于 2013-12-10 05:00:48
onCreateAnimator
方法很奇怪。我看到的原型是这样的:
public Animator onCreateAnimator(int transit, boolean enter, int nextAnim)
int transit
-如sandrstar上面所说的转换类型
boolean enter
-如果为'entering‘,则为true,否则为false
int nextAnim
-即将播放的动画的资源ID。
举个例子,如果你试着翻牌,from the documentation
// Create and commit a new fragment transaction that adds the fragment for the back of
// the card, uses custom animations, and is part of the fragment manager's back stack.
BackOfCardFragment backFragment = new BackOfCardFragment();
getFragmentManager()
.beginTransaction()
// Replace the default fragment animations with animator resources representing
// rotations when switching to the back of the card, as well as animator
// resources representing rotations when flipping back to the front (e.g. when
// the system Back button is pressed).
.setCustomAnimations(
R.animator.card_flip_right_in, R.animator.card_flip_right_out,
R.animator.card_flip_left_in, R.animator.card_flip_left_out)
// Replace any fragments currently in the container view with a fragment
// representing the next page (indicated by the just-incremented currentPage
// variable).
.replace(R.id.container_view, backFragment)
// Add this transaction to the back stack, allowing users to press Back
// to get to the front of the card.
.addToBackStack(null)
// Commit the transaction.
.commit();
注意:上例中的R.id.container_view是包含您试图替换的现有片段的ViewGroup的ID。
当执行上述代码时,将调用onCreateAnimator
方法,并且nextAnim
参数将是传递给setCustomAnimations()
函数的四个动画is之一,即R.animator.card_flip_right_in、R.animator.card_flip_right_out...等。
乍一看,这似乎不是很有用,因为它不会为您提供对可以附加侦听器的实际Animator对象的引用。但奇怪的是,您可以直接从nextAnim
资源中膨胀另一个Animator,然后将侦听器附加到该动画中,奇怪的是,它将在正确的时间触发所有被覆盖的回调:
@Override
public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
Animator animator = null;
// In this example, i want to add a listener when the card_flip_right_in animation
// is about to happen.
if (nextAnim == R.animator.card_flip_right_in) {
animator = AnimatorInflater.loadAnimator(getActivity(), nextAnim);
// * Sometimes onCreateAnimator will be called and nextAnim will be 0,
// causing animator to be null.
// * I wanted to add a listener when the fragment was entering -
// your use case may be different.
if (animator != null && enter) {
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
// Do something when the card flip animation begins
}
@Override
public void onAnimationEnd(Animator animation) {
// Do something as soon as the card flip animation is over
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
}
}
return animator;
}
通过这种方式,您应该能够将侦听器添加到片段转换动画器中,就像您自己创建它们一样。
发布于 2013-06-04 13:59:09
基于FragmentManager代码和FragmentManagerImpl.loadAnimator(android.app.Fragment,int,boolean,int)的用法,Fragment.onCreateAnimator(int, boolean, int)似乎可以让你定义自己的动画来隐藏,显示,改变状态。然而,我从来没有见过它在真正的应用程序中的使用。
关于参数:
int transit
-转换类型(常量FragmentTransaction,例如,如果其状态为enter,则在otherwise;int transitionStyle
- true
中使用,false -来自资源的样式的false- style - id (该样式可能包含从onCreateAnimator
);中遗漏的动画
https://stackoverflow.com/questions/16910510
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