在 fragmenStatePagerAdapter 的嵌套片段中，非法状态异常-指定的子级已经有父级

Posted 2023-04-18

【中文标题】在 fragmenStatePagerAdapter 的嵌套片段中，非法状态异常-指定的子级已经有父级

【英文标题】：illegalstateexception-the-specified-child-already-has-a-parent inside nested fragment on fragmenStatePagerAdapter

【发布时间】：2020-11-04 21:19:07

【问题描述】：

我在嵌套片段中有一个材质选项卡布局和 androidx 视图寻呼机。当我导航到不同的片段或活动，然后使用 tablayot 返回我的片段时，它会因以下跟踪而崩溃

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 androidx.viewpager.widget.ViewPager.addView(ViewPager.java:1485)
            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:1187)
            at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1356)
            at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1434)
            at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1497)
            at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2625)
            at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2577)
            at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:2722)
            at androidx.fragment.app.FragmentStateManager.activityCreated(FragmentStateManager.java:346)
            at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1188)
            at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2224)
            at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1997)
            at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1953)
            at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
            at androidx.fragment.app.FragmentManager$4.run(FragmentManager.java:413)
            at android.os.Handler.handleCallback(Handler.java:883)
            at android.os.Handler.dispatchMessage(Handler.java:100)
            at android.os.Looper.loop(Looper.java:214)
            at android.app.ActivityThread.main(ActivityThread.java:7356)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

这是我使用 tablayot 和片段 viewPager 的片段

override fun onViewCreated(view: View, savedInstanceState: Bundle?) 
    super.onViewCreated(view, savedInstanceState)
    val adapter=ViewPagerAdapter(childFragmentManager)
    adapter.addFragment(TabOneFragment)
    adapter.addFragment(TabTwoFragment)
    adapter.addFragment(TabThreeFragment)
    viewPager.adapter = adapter
    tabLayout.setupWithViewPager(viewPager)

我尝试了所有指向该跟踪的答案，但没有一个有效。 如果我将活动的 fragmentManager 传递给 ViewPagerAdapter 不会发生崩溃，但在这种情况下它会泄漏内存。 有什么想法吗？

【参考方案1】：

您是否尝试过删除 onDestroyView 中的视图？ (Like this)

对不起，我没有足够的代表来写 cmets