我有一个Live Android应用程序,从市场上我收到了以下堆栈跟踪,我不知道为什么它会发生,因为它不是发生在应用程序代码中,而是由应用程序的一些或其他事件引起的(假设)

我没有使用片段,仍然有一个FragmentManager的参考。 如果有人能揭示一些隐藏的事实,以避免这类问题:

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.onKeyDown(Activity.java:1962)
at android.view.KeyEvent.dispatch(KeyEvent.java:2482)
at android.app.Activity.dispatchKeyEvent(Activity.java:2274)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1668)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1720)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1258)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1668)
at android.view.ViewRoot.deliverKeyEventPostIme(ViewRoot.java:2851)
at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2824)
at android.view.ViewRoot.handleMessage(ViewRoot.java:2011)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:132)
at android.app.ActivityThread.main(ActivityThread.java:4025)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
at dalvik.system.NativeStart.main(Native Method)  

当前回答

我有同样的问题,得到IllegalStateException,但替换所有调用commit()与commitAllowingStateLoss()没有帮助。

罪魁祸首是调用DialogFragment.show()。

我用

try {
    dialog.show(transaction, "blah blah");
}
catch(IllegalStateException e) {
    return;
}

这样就成功了。好吧,我没有展示对话,但在这种情况下,这是可以的。

这是我的应用程序中唯一一个我第一次调用FragmentManager.beginTransaction()但从未调用commit()的地方,所以当我寻找“commit()”时,我没有找到它。

有趣的是,用户从未离开该应用。相反,出现的AdMob插页广告才是罪魁祸首。

其他回答

读 http://chris-alexander.co.uk/on-engineering/dev/android-fragments-within-fragments/

篇文章。 fragment. isresume()检查帮助我在onDestroyView w/o使用onSaveInstanceState方法。

I noticed something very interesting. I have in my app the option to open the phone's gallery and the device asks what app to use, there I click on the gray area away from the dialog and saw this issue. I noticed how my activity goes from onPause, onSaveInstanceState back to onResume, it doesn't happen to visit onCreateView. I am doing transactions at onResume. So what I ended up doing is setting a flag being negated onPause, but being true onCreateView. if the flag is true onResume then do onCommit, otherwise commitAllowingStateLoss. I could go on and waste so much time but I wanted to check the lifecycle. I have a device which is sdkversion 23, and I don't get this issue, but I have another one which is 21, and there I see it.

解决这个问题的另一种生命周期方法是使用kotlin最新发布的lifecycle-ktx。

lifecycleScope.launchWhenResumed {
    // your code with fragment or dialogfragment
}

闭包将在恢复状态后运行,因此甚至在恢复状态后调用此方法 停,等下一份简历来的时候就安全执行了。

你也可以选择喜欢

lifecycleScope.launchWhenCreated
// or
lifecycleScope.launchWhenStarted

适合你的情况。

当销毁完成时,代码将被取消。

谷歌文档链接: https://developer.android.com/kotlin/ktx#lifecycle

这发生在你试图加载一个片段,但活动已改变其状态为onPause()。例如,当您试图获取数据并将其加载到活动中,但当用户单击某个按钮并移动到下一个活动时,就会发生这种情况。

你可以用两种方法解决这个问题

您可以使用transaction.commitAllowingStateLoss()而不是transaction.commit()来加载片段,但您可能最终会丢失已完成的提交操作。

or

在加载片段时,确保活动处于恢复状态,而不是进入暂停状态。 创建一个布尔值并检查activity是否不进入onPause()状态。

@Override
public void onResume() {
    super.onResume();
    mIsResumed = true;
}

@Override
public void onPause() {
    mIsResumed = false;
    super.onPause();
}

然后,而加载片段检查活动是否存在,只有当活动是前景时才加载。

if(mIsResumed){
 //load the fragment
}

你可以使用FragmentActivity。onStart在popBackStackImmediate之前

是这样的:

public void backStackFragment() {
    this.start();
    getFragmentManager().popBackStackImmediate();
}

public void start(){
    FragmentActivity a = getActivity();
    if(a instanceof DepositPlanPadActivity){
      ((DepositPlanPadActivity)a).onStart();
    }
    if(a instanceof SmallChangePlanPad){
            ((SmallChangePlanPad)a).onStart();
        }
        if(a instanceof UserCenterActivity){
            ((UserCenterActivity)a).onStart();
        }
    }

http://jorryliu.blogspot.com/2014/09/illegalstateexception-can-not-perform.html