如果你使用的是recyclerview，只需在你的点击上添加一个点击监听器冷却时间，并在你的recyclerview xml文件中使用android:splitMotionEvents="false"

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)
    }
}

当我按了两次后退键时，我想到了这个问题。首先，我拦截KeyListener并覆盖KeyEvent.KEYCODE_BACK。我在名为OnResume的函数中添加了下面的代码，然后解决了这个问题/问题。

  override fun onResume() {
        super.onResume()
        view?.isFocusableInTouchMode = true
        view?.requestFocus()
        view?.setOnKeyListener { v, keyCode, event ->
            if (event.action == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_BACK) {
                activity!!.finish()
                true
            }
            false
        }
    }

当我第二次遇到这种情况时，它的状态与第一次相同，我发现我可能会使用add函数。让我们来分析一下这些情况。

首先，FragmentA导航到FragmentB，然后FragmentB导航到FragmentA，然后按下返回按钮…崩溃出现了。 其次，FragmentA导航到FragmentB，然后FragmentB导航到FragmentC, FragmentC导航到FragmentA，然后按下返回按钮…崩溃出现了。

所以我认为当按下返回按钮时，FragmentA会回到FragmentB或FragmentC，这会导致登录混乱。最后，我发现名为popBackStack的函数可以用于返回，而不是导航。

  NavHostFragment.findNavController(this@TeacherCloudResourcesFragment).
                        .popBackStack(
                            R.id.teacher_prepare_lesson_main_fragment,false
                        )

到目前为止，问题已经真正解决了。

I caught this exception after some renames of classes. For example: I had classes called FragmentA with @+is/fragment_a in navigation graph and FragmentB with @+id/fragment_b. Then I deleted FragmentA and renamed FragmentB to FragmentA. So after that node of FragmentA still stayed in navigation graph, and android:name of FragmentB's node was renamed path.to.FragmentA. I had two nodes with the same android:name and different android:id, and the action I needed were defined on node of removed class.

我为Fragment创建了这个扩展函数:

fun Fragment.safeNavigate(
    @IdRes actionId: Int,
    @Nullable args: Bundle? = null,
    @Nullable navOptions: NavOptions? = null,
    @Nullable navigatorExtras: Navigator.Extras? = null
) {
    NavHostFragment.findNavController(this).apply {
        if (currentDestination?.label == this@safeNavigate::class.java.simpleName) {
            navigate(actionId, args, navOptions, navigatorExtras)
        }
    }
}

发生此错误可能是因为您将目标屏幕分配给了错误的图形