Android IllegalStateException:指定的子级已具有父级

当切换回我已经看到的视图时，活动崩溃并抛出一个IllegalStateException：指定的子级已经有父级。必须首先对子级的父级调用removeView（）

堆栈跟踪：

02-23 23:59:22.685    9254-9254/ldellabella3.gatech.edu.sustainability_in_computer_science E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: ldellabella3.gatech.edu.sustainability_in_computer_science, PID: 9254
    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:3770)
            at android.view.ViewGroup.addView(ViewGroup.java:3623)
            at android.view.ViewGroup.addView(ViewGroup.java:3568)
            at android.view.ViewGroup.addView(ViewGroup.java:3544)
            at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:951)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
            at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
            at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
            at android.support.v4.view.ViewPager$3.run(ViewPager.java:249)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:812)
            at android.view.Choreographer.doCallbacks(Choreographer.java:612)
            at android.view.Choreographer.doFrame(Choreographer.java:581)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:798)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:146)
            at android.app.ActivityThread.main(ActivityThread.java:5487)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
            at dalvik.system.NativeStart.main(Native Method)
02-24 00:02:57.133    9800-9800/ldellabella3.gatech.edu.sustainability_in_computer_science E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: ldellabella3.gatech.edu.sustainability_in_computer_science, PID: 9800
    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:3770)
            at android.view.ViewGroup.addView(ViewGroup.java:3623)
            at android.view.ViewGroup.addView(ViewGroup.java:3568)
            at android.view.ViewGroup.addView(ViewGroup.java:3544)
            at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:951)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
            at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
            at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
            at android.support.v4.view.ViewPager$3.run(ViewPager.java:249)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:812)
            at android.view.Choreographer.doCallbacks(Choreographer.java:612)
            at android.view.Choreographer.doFrame(Choreographer.java:581)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:798)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:146)
            at android.app.ActivityThread.main(ActivityThread.java:5487)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
            at dalvik.system.NativeStart.main(Native Method)

传递给setContentView（）的xml是

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

我的屏幕幻灯片展示课

public class ScreenSlideFragment extends Fragment {

    private ImageView myImg;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return myImg;
    }

    public void setMySlide(ImageView img) {
        myImg = img;
    }
}

---

在片段中添加以下代码

@Override
public void onDestroyView() {
    super.onDestroyView();
    if (myImg != null) {
        ViewGroup parentViewGroup = (ViewGroup) myImg.getParent();
        if (parentViewGroup != null) {
            parentViewGroup.removeAllViews();
        }
    }
}

---

是否可以为异常添加stacktrace（而不仅仅是异常的文本）？这通常包含有价值的信息。这是来自不同异常的stacktrace，通常是从未在

AndroidManifest.xml

中声明活动中获得的。您目前遇到了哪些异常？好的，现在已经添加了，对此表示抱歉D:非常感谢！我在别处看到了这个答案，但不知道如何实现它。你救了我：'）

@Override
public void onDestroyView() {
    super.onDestroyView();
    if (myImg != null) {
        ViewGroup parentViewGroup = (ViewGroup) myImg.getParent();
        if (parentViewGroup != null) {
            parentViewGroup.removeAllViews();
        }
    }
}