Android 导航组件弹出到转换问题 [英] Android Navigation Component pop to transition issue

问题描述

我有两个动作

动作1

 <action
        android:id="@+id/actionBaseFragmentToAskForLocation"
        app:destination="@+id/introAskForLocationFragment"
        app:enterAnim="@anim/slide_in_right"
        app:exitAnim="@anim/slide_out_left"
        app:popEnterAnim="@anim/slide_in_left"
        app:popExitAnim="@anim/slide_out_right" />

动作2

<action
        android:id="@+id/actionIntroAskLocationToLogin"
        app:destination="@id/loginFragment"
        app:enterAnim="@anim/slide_in_right"
        app:exitAnim="@anim/slide_out_left"
        app:popEnterAnim="@anim/slide_in_right"
        app:popExitAnim="@anim/fade_out"
        app:popUpTo="@+id/app_main_navigation" />

我想要的是当第二个动作被触发时，我想清除返回堆栈并只设置 loginFragment 以保留在堆栈中.

What i want is when the second action is triggered i want to clear the back stack and set only loginFragment to remain in the stack.

只有一个问题是当我执行 Action2 时，'slide_out_right' 作为退出动画执行

just one problem is when i perform the Action2, 'slide_out_right' is performed as exit animation

我知道如果我们从堆栈中弹出片段，将触发 action1 的 'popExitAnim' 而不是 action2 的 'exitAnim'.

I understand that if we pop the fragment from the stack the 'popExitAnim' of action1 will be triggered instead of 'exitAnim' of action2.

但我想知道如何让片段执行 slide_out_left 动画以退出并将其从堆栈中弹出.

but i want to know how can I make the fragment perform slide_out_left animation for exiting and also pop it out of the stack.

推荐答案

我最终在调用 navigate 的片段中覆盖了 onCreateAnimation.此示例展示了如何按 ID 浏览嵌套导航图并有条件地替换 pop 退出动画(或 popExitAnim).

I ended up overriding onCreateAnimation in the fragment that calls navigate. This exemple shows how to navigate through nested nav graphs by ID and replace the pop exit animation (or popExitAnim) conditionnally.

override fun onCreateAnimation(transit: Int, enter: Boolean, nextAnim: Int): Animation? {
    val navController = findNavController()
    val graph = navController.graph.findNode(R.id.onboardingGraph) as NavGraph
    val dest = graph.findNode(R.id.confirmationFragment)
    if (!enter && dest != null && navController.currentDestination?.id == dest.id) {
        return AnimationUtils.loadAnimation(requireContext(), R.anim.slide_out_left)
    }
    return super.onCreateAnimation(transit, enter, nextAnim)
}

请注意，这种特殊情况的部分原因是幻灯片动画的方向性.

Note that this particular situation is partly due to the directional nature of slide animations.

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