一段时间后从后台恢复时应用程序重新启动。

Question

场景是当应用程序位于片段A上，然后将应用程序在后台保存一段时间。在从后台恢复后，应用程序的初始状态是片段A，但是突然从导航组件中的startDestination重新启动，导致下面的崩溃。

 Fatal Exception: java.lang.IllegalArgumentException: Navigation action/destination com.app.gulfcraftv2:id/action_splashFragment_to_nav_home cannot be found from the current destination Destination(com.app.gulfcraftv2:id/companyFragment) class=com.precise.gulfcraft.ui.companydetail.CompanyDetailFragment
   at androidx.navigation.NavController.navigate(NavController.kt:1540)
   at androidx.navigation.NavController.navigate(NavController.kt:1472)
   at androidx.navigation.NavController.navigate(NavController.kt:1930)
   at com.precise.gulfcraft.ui.splash.SplashFragment.onCreate$lambda-6(SplashFragment.kt:75)
   at com.precise.gulfcraft.ui.splash.SplashFragment.lambda$Aso8YI02DbFhfWptH-qrBUU0ulU()
   at com.precise.gulfcraft.ui.splash.-$$Lambda$SplashFragment$Aso8YI02DbFhfWptH-qrBUU0ulU.run(:2)
   at android.os.Handler.handleCallback(Handler.java:883)
   at android.os.Handler.dispatchMessage(Handler.java:100)
   at android.os.Looper.loop(Looper.java:224)
   at android.app.ActivityThread.main(ActivityThread.java:7562)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)

注意-使用的启动模式是singleTop

坠机发生在下面的部分。

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    try {
        Handler(Looper.getMainLooper()).postDelayed({
            findNavController().navigate(SplashFragmentDirections.actionSplashFragmentToNavHome())
        }, 3000)
    } catch (e: Exception) {
    }
}

Answer 1

首先检查这是否是您的当前目的地，并具有以下功能

fun navigate(destination: NavDirections) = with(findNavController()) {
    currentDestination?.getAction(destination.actionId)
        ?.let { navigate(destination) }
}