IllegalStateException:在ViewPager的onSaveInstanceState后不能执行此操作

我在市场上从我的应用程序获得用户报告，交付以下异常:

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1109)
at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:399)
at android.app.Activity.onBackPressed(Activity.java:2066)
at android.app.Activity.onKeyUp(Activity.java:2044)
at android.view.KeyEvent.dispatch(KeyEvent.java:2529)
at android.app.Activity.dispatchKeyEvent(Activity.java:2274)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1855)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1277)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.widget.TabHost.dispatchKeyEvent(TabHost.java:297)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1855)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1277)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewRoot.deliverKeyEventPostIme(ViewRoot.java:2880)
at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2853)
at android.view.ViewRoot.handleMessage(ViewRoot.java:2028)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:132)
at android.app.ActivityThread.main(ActivityThread.java:4028)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
at dalvik.system.NativeStart.main(Native Method)

显然这与FragmentManager有关，而我并不使用它。堆栈跟踪没有显示任何我自己的类，所以我不知道这个异常发生在哪里以及如何防止它。

为了记录:我有一个tabhost，在每个选项卡中都有一个在活动之间切换的ActivityGroup。

当前回答

注意，使用transaction.commitAllowingStateLoss()可能会给用户带来糟糕的体验。有关为什么会抛出这个异常的更多信息，请参阅这篇文章。

2015-11-13 15:29:08

其他回答

请在这里检查我的答案。基本上我只需要:

@Override
protected void onSaveInstanceState(Bundle outState) {
    //No call for super(). Bug on API Level > 11.
}

不要在saveInstanceState方法上调用super()。这把事情搞砸了……

这是支持包中的一个已知错误。

如果你需要保存实例并添加一些东西到outState Bundle中，你可以使用以下方法:

@Override
protected void onSaveInstanceState(Bundle outState) {
    outState.putString("WORKAROUND_FOR_BUG_19917_KEY", "WORKAROUND_FOR_BUG_19917_VALUE");
    super.onSaveInstanceState(outState);
}

最后，正确的解决方案是(如评论所示)使用:

transaction.commitAllowingStateLoss();

当添加或执行导致异常的FragmentTransaction时。

2012-04-21 17:43:55

把这个添加到你的活动中

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    if (outState.isEmpty()) {
        // Work-around for a pre-Android 4.2 bug
        outState.putBoolean("bug:fix", true);
    }
}

2016-03-03 12:35:06

注意，使用transaction.commitAllowingStateLoss()可能会给用户带来糟糕的体验。有关为什么会抛出这个异常的更多信息，请参阅这篇文章。

2015-11-13 15:29:08

Fragment事务不应该在Activity.onStop()之后执行! 检查你没有任何回调可以在onStop()之后执行事务。最好是修复原因，而不是尝试使用.commitAllowingStateLoss()等方法来绕过问题。

2019-06-21 08:48:06

芬兰湾的科特林扩展

fun FragmentManager?.replaceAndAddToBackStack(
    @IdRes containerViewId: Int,
    fragment: () -> Fragment,
    tag: String
) {
    // Find and synchronously remove a fragment with the same tag.
    // The second transaction must start after the first has finished.
    this?.findFragmentByTag(tag)?.let {
        beginTransaction().remove(it).commitNow()
    }
    // Add a fragment.
    this?.beginTransaction()?.run {
        replace(containerViewId, fragment, tag)
        // The next line will add the fragment to a back stack.
        // Remove if not needed.
        // You can use null instead of tag, but tag is needed for popBackStack(), 
        // see https://stackoverflow.com/a/59158254/2914140
        addToBackStack(tag)
    }?.commitAllowingStateLoss()
}

用法:

val fragment = { SomeFragment.newInstance(data) }
fragmentManager?.replaceAndAddToBackStack(R.id.container, fragment, SomeFragment.TAG)

2019-07-23 10:15:59

IllegalStateException:在ViewPager的onSaveInstanceState后不能执行此操作

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