一个荒谬但非常强大的方法是: 简单地称之为:

view?.findNavController()?.navigateSafe(action)

只需创建这个扩展:

fun NavController.navigateSafe(
    navDirections: NavDirections? = null
) {
    try {
        navDirections?.let {
            this.navigate(navDirections)
        }
    }
    catch (e:Exception)
    {
        e.printStackTrace()
    }
}

在我的案例中，错误发生是因为我在启动画面后启用了带有Single Top和Clear Task选项的导航操作。

在我的情况下，我有多个导航图文件，我试图从一个导航图位置移动到另一个导航图的目的地。

为此，我们必须将第二个导航图像这样包含在第一个导航图中

<include app:graph="@navigation/included_graph" />

并将此添加到你的行动中:

<action
        android:id="@+id/action_fragment_to_second_graph"
        app:destination="@id/second_graph" />

其中second_graph为:

<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/second_graph"
    app:startDestination="@id/includedStart">

在第二张图中。

更多信息请点击这里

在思考了Ian Lake在推特上的建议后，我想出了以下方法。将NavControllerWrapper定义如下:

class NavControllerWrapper constructor(
  private val navController: NavController
) {

  fun navigate(
    @IdRes from: Int,
    @IdRes to: Int
  ) = navigate(
    from = from,
    to = to,
    bundle = null
  )

  fun navigate(
    @IdRes from: Int,
    @IdRes to: Int,
    bundle: Bundle?
  ) = navigate(
    from = from,
    to = to,
    bundle = bundle,
    navOptions = null,
    navigatorExtras = null
  )

  fun navigate(
    @IdRes from: Int,
    @IdRes to: Int,
    bundle: Bundle?,
    navOptions: NavOptions?,
    navigatorExtras: Navigator.Extras?
  ) {
    if (navController.currentDestination?.id == from) {
      navController.navigate(
        to,
        bundle,
        navOptions,
        navigatorExtras
      )
    }
  }

  fun navigate(
    @IdRes from: Int,
    directions: NavDirections
  ) {
    if (navController.currentDestination?.id == from) {
      navController.navigate(directions)
    }
  }

  fun navigateUp() = navController.navigateUp()

  fun popBackStack() = navController.popBackStack()
}

然后在导航代码中:

val navController = navControllerProvider.getNavController()
navController.navigate(from = R.id.main, to = R.id.action_to_detail)

我写了这个扩展

fun Fragment.navigateAction(action: NavDirections) {
    val navController = this.findNavController()
    if (navController.currentDestination?.getAction(action.actionId) == null) {
        return
    } else {
        navController.navigate(action)
    }
}

看来你在完成任务。应用程序可能有一次性设置或一系列登录屏幕。这些有条件的屏幕不应该被认为是应用程序的起始目的地。

https://developer.android.com/topic/libraries/architecture/navigation/navigation-conditional