android - fragment 隐藏动画不播放

Question

我正在尝试用幻灯片动画切换我的 fragment

使用这段代码:

FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();        
SearchPanelFragment existingFragment = (SearchPanelFragment) manager.findFragmentByTag(SearchPanelFragment.FRAGMENT_NAME);        
transaction.setCustomAnimations(R.xml.slide_down_search_panel, R.xml.slide_up_search_panel);        
if (existingFragment != null) {
    if (existingFragment.isVisible())
        transaction.remove(existingFragment);       
} else {
    transaction.add(R.id.top_panel_fragment, new SearchPanelFragment(this), SearchPanelFragment.FRAGMENT_NAME);
}

    transaction.commit();

到目前为止，我只在 transaction.add 上获得了进入动画 什么时候播放退出动画？我只能在使用 transaction.replace 时得到它，但后来我只是用相同的新 fragment 交换一个旧 fragment ，我想要的是隐藏/删除/分离/任何必要的东西让它消失播放退出动画

编辑:我试过隐藏、删除和分离。无论我做什么，动画都不会播放。它仅在添加、显示和替换时播放

编辑 2:第二个动画可能有问题。请看一下它们。第一个向下滑动，似乎工作正常。

向下滑动

<translate
    android:duration="500"
    android:fromXDelta="0%"
    android:fromYDelta="-100%"
    android:toXDelta="0%"
    android:toYDelta="0%" />

向上滑动

<translate
    android:duration="700"
    android:fromXDelta="0%"
    android:fromYDelta="0%"
    android:toXDelta="0%"
    android:toYDelta="-100%" />

Answer 1

您实际上使用了错误的功能。

根据 setCustomAnimations(int enter, int exit) 的文档:

Set specific animation resources to run for the fragments that are entering and exiting in this transaction. These animations will not be played when popping the back stack.

相反，您应该使用 setCustomAnimations (int enter, int exit, int popEnter, int popExit) :

Set specific animation resources to run for the fragments that are entering and exiting in this transaction. The popEnter and popExit animations will be played for enter/exit operations specifically when popping the back stack.