在片段中嵌入 Xamarin.Forms 片段会导致“孩子已经有父母”崩溃

分类：编程问答

如何解决在片段中嵌入 Xamarin.Forms 片段会导致“孩子已经有父母”崩溃

我正在开发一个库，允许您将 Xamarin.Forms 页面与 MvvmCross 提供的本机导航服务一起使用。

Android 实现在使用 Fragments 时存在问题。如果您查看 library / sample project，在加载第二个片段后按下后退按钮时会发生崩溃。

重现步骤：

  1. 启动应用
  2. 按“片段导航堆栈”
  3. 按“下一步”
  4. 按下后退按钮。

我一直在努力想办法阻止这个错误的发生。

应用程序因此错误而崩溃。

Java.Lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
  --- End of managed Java.Lang.IllegalStateException stack trace ---
java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
    at android.view.ViewGroup.addViewInner(ViewGroup.java:5106)
    at android.view.ViewGroup.addView(ViewGroup.java:4935)
    at android.view.ViewGroup.addView(ViewGroup.java:4875)
    at android.view.ViewGroup.addView(ViewGroup.java:4848)
    at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:326)
    at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1199)
    at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1368)
    at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1446)
    at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1509)
    at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:447)
    at androidx.fragment.app.FragmentManager.executeOps(FragmentManager.java:2181)
    at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2004)
    at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1959)
    at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1861)
    at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2641)
    at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2589)
    at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:2723)
    at androidx.fragment.app.FragmentStateManager.activityCreated(FragmentStateManager.java:346)
    at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1200)
    at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1368)
    at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1446)
    at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1509)
    at androidx.fragment.app.BackStackRecord.executePopOps(BackStackRecord.java:510)
    at androidx.fragment.app.FragmentManager.executeOps(FragmentManager.java:2178)
    at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2004)
    at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1959)
    at androidx.fragment.app.FragmentManager.popBackStackImmediate(FragmentManager.java:670)
    at androidx.fragment.app.FragmentManager.popBackStackImmediate(FragmentManager.java:581)
    at androidx.fragment.app.FragmentManager.handleOnBackPressed(FragmentManager.java:553)
    at androidx.fragment.app.FragmentManager$1.handleOnBackPressed(FragmentManager.java:350)
    at androidx.activity.OnBackPressedDispatcher.onBackPressed(OnBackPressedDispatcher.java:192)
    at androidx.activity.ComponentActivity.onBackPressed(ComponentActivity.java:314)
    at android.app.Activity.onKeyUp(Activity.java:3641)
    at android.view.KeyEvent.dispatch(KeyEvent.java:2825)
    at android.app.Activity.dispatchKeyEvent(Activity.java:3958)
    at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:122)
    at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:84)
    at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:140)
    at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:569)
    at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
    at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:3054)
    at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:367)
    at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5413)
    at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5281)
    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4788)
    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4841)
    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4807)
    at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4947)
    at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4815)
    at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5004)
    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4788)
    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4841)
    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4807)
    at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4815)
    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4788)
    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4841)
    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4807)
    at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4980)
    at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:5141)
    at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:3064)
    at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:2607)
    at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:2598)
    at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:3041)
    at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:143)
    at android.os.MessageQueue.nativePollOnce(Native Method)
    at android.os.MessageQueue.next(MessageQueue.java:336)
    at android.os.Looper.loop(Looper.java:174)
    at android.app.ActivityThread.main(ActivityThread.java:7356)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

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