如何淡出片段过渡中的非共享视图？

Question

我目前正在尝试使用片段进行共享元素转换，并且基本想法可行。我有两个非常相似的屏幕（见屏幕截图），并且共享过渡适用于表单，但是两个按钮 (login/social) 没有优雅地过渡，它们只是在退出时消失，并在进入时重新出现。是否可以指定这两个视图项在过渡期间淡出和淡入？

片段A

 getActivity().getSupportFragmentManager().beginTransaction()
            .addSharedElement(btn_next, ViewCompat.getTransitionName(btn_next))
            .addSharedElement(et_email, ViewCompat.getTransitionName(et_email))
            .addSharedElement(ll_form, ViewCompat.getTransitionName(ll_form))
            .replace(R.id.fl_content, new LoginFragment())
            .addToBackStack(null)
            .commit();

片段 B

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setSharedElementEnterTransition(TransitionInflater.from(getContext()).inflateTransition(android.R.transition.move));

Answer 1

所以在进一步挖掘之后，我了解到非共享视图被称为 transitioning views，如 AndroidDesignPatterns.com

中所述

A content transition determines how an activity’s non-shared views (also called transitioning views) enter or exit the activity scene.

并在同一网站的另一个 article 上找到

setExitTransition() - A’s exit transition animates transitioning views out of the scene when A starts B.
setEnterTransition() - B’s enter transition animates transitioning views into the scene when A starts B.
setReturnTransition() - B’s return transition animates transitioning views out of the scene when B returns to A.
setReenterTransition() - A’s reenter transition animates transitioning views into the scene when B returns to A.

这么简单的一行就解决了我的问题。

setExitTransition(TransitionInflater.from(getActivity()).inflateTransition(android.R.transition.fade));

如何淡出片段过渡中的非共享视图？

How to fade out non shared views in fragment transition?

android

android-fragments

shared-element-transition