java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

最新推荐文章于 2021-04-15 19:53:49 发布

原创最新推荐文章于 2021-04-15 19:53:49 发布 · 1k 阅读

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#app #Exception #bug #Transition #Fragment

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本文探讨了在Android应用中遇到的问题：在Activity执行onSaveInstanceState后尝试提交Fragment时引发的IllegalStateException异常。文章提供了详细的错误日志，并解释了FragmentManager在不同状态下的提交规则。同时介绍了如何通过commitAllowingStateLoss方法来规避此问题。

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最近做了一个APP准备验收，之前都是做里边的功能，6.0以上的权限都是进去的时候都申请好了，然而最近登陆进去申请授权后就崩了，不禁让人菊花一紧，之前咋没出现，再次点击去，APP可以正常运行，玩我？但是我还是很小心的看了一下日志：

 java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

     at android.app.ActivityThread.deliverResults(ActivityThread.java:3724)

     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3767)

     at android.app.ActivityThread.access$1500(ActivityThread.java:153)

     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1418)

     at android.os.Handler.dispatchMessage(Handler.java:102)

     at android.os.Looper.loop(Looper.java:154)

     at android.app.ActivityThread.main(ActivityThread.java:5462)

     at java.lang.reflect.Method.invoke(Native Method)

     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)

     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)

  Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

     at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1842)

     at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1860)

     at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:649)

     at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:609

     at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:6634)

     at android.app.Activity.dispatchActivityResult(Activity.java:6512)

     at android.app.ActivityThread.deliverResults(ActivityThread.java:3720)

     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3767)?

     at android.app.ActivityThread.access$1500(ActivityThread.java:153)?

     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1418)?

     at android.os.Handler.dispatchMessage(Handler.java:102)?

     at android.os.Looper.loop(Looper.java:154)?

     at android.app.ActivityThread.main(ActivityThread.java:5462)?

     at java.lang.reflect.Method.invoke(Native Method)?

     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)?

     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)?

最终看到了关键所在，”Can not perform this action after onSaveInstanceState”,就是说不在保存状态之后去进行”this action”,”this action”指的就是下边的FragmentManager的commint()方法。我们都知道，FragmentManager开启事物最后都要提交：

FragmentTransaction transaction = fragmentManager.beginTransaction();

transaction.add(R.id.fragmentContainer, new MyFragment(), String.valueOf(0));

transaction.commit();

通过查看FragmentManager的commit（）官方文档我们可以看到：

Schedules a commit of this transaction. The commit does not happen immediately; 

it will be scheduled as work on the main thread to be done the next time that thread is ready.





A transaction can only be committed with this method prior to its containing activity saving its state. 

If the commit is attempted after that point, an exception will be thrown. This is because the state after

the commit can be lost if the activity needs to be restored from its state. See commitAllowingStateLoss()

for situations where it may be okay to lose the commit.