原因：java.lang.IllegalStateException：onSaveInstanceStateの後にこのアクションを実行できません。

Question

私は別のフラグメントを呼び出そうとしている権限を取得した後、カレンダーを読むためのアクセス権を取得しようとしています。私は次の例外で立ち往生しています。これは、アプリケーションの最初の起動時にのみ発生します。次の起動アプリケーションでは正常に動作します。あなたのフラグメントの活動のonSaveInstanceState()が呼び出される後のフラグメントの移行を実行しようとした場合

5488-5488/com.mindtree.calenderevents E/AndroidRuntime: FATAL EXCEPTION: main 
Process: com.mindtree.calenderevents, PID: 5488 
java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=2, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.mindtree.calenderevents/com.mindtree.calenderevents.MainActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState 
    at android.app.ActivityThread.deliverResults(ActivityThread.java:4998) 
    at android.app.ActivityThread.handleSendResult(ActivityThread.java:5041) 
    at android.app.ActivityThread.access$1600(ActivityThread.java:229) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1875) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:148) 
    at android.app.ActivityThread.main(ActivityThread.java:7325) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState 
    at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1533) 
    at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1551) 
    at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:696) 
    at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:662) 
    at com.mindtree.calenderevents.MainActivity.onRequestPermissionsResult(MainActivity.java:59) 
    at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:7291) 
    at android.app.Activity.dispatchActivityResult(Activity.java:7169) 
    at android.app.ActivityThread.deliverResults(ActivityThread.java:4994) 
    at android.app.ActivityThread.handleSendResult(ActivityThread.java:5041)  
    at android.app.ActivityThread.access$1600(ActivityThread.java:229)  
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1875)  
    at android.os.Handler.dispatchMessage(Handler.java:102)  
    at android.os.Looper.loop(Looper.java:148)  
    at android.app.ActivityThread.main(ActivityThread.java:7325)  
    at java.lang.reflect.Method.invoke(Native Method)  
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)  
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)  

これは私のコード

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
     TopSectionFragment fragment = TopSectionFragment.newInstance(); 
    getSupportFragmentManager().beginTransaction().replace(R.id.fragment, fragment) 
      .commit(); 

} 

@Override 
public void getEvents() { 
    Log.i("mainacteventmethod ","mainacteventmethod"); 
    //TODO: implement method to fetch events from calendar and add as fragment arguments 
    getPermissionToReadCalender(); 

} 

@Override 
public void onRequestPermissionsResult(int requestCode, 
             @NonNull String permissions[], @NonNull int[] grantResults) { 
    switch (requestCode) { 
     case READ_CALENDER: { 

      if (grantResults.length > 0 
        && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 
       // permission was granted, yay! Do the 
       // contacts-related task you need to do. 
       RuntimeData.setsCalendarData(getCalender(null)); 
       if (RuntimeData.getsCalendarData() != null) { 
        BottomSectionFragment bottomFragment = new BottomSectionFragment(); 
        getSupportFragmentManager().beginTransaction().replace(R.id.fragment2, 
          bottomFragment).commit(); 
       } 

      } else { 
       // permission denied, boo! Disable the 
       // functionality that depends on this permission. 
      } 
      return; 
     } 
     // other 'case' lines to check for other 
     // permissions this app might request 
    } 
} 

private void getPermissionToReadCalender() { 
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) { 

     if (shouldShowRequestPermissionRationale(
       Manifest.permission.READ_CALENDAR)) { 
     } 
     requestPermissions(new String[]{Manifest.permission.READ_CALENDAR}, 
       READ_CALENDER); 

    }else{ 
     RuntimeData.setsCalendarData(getCalender(null)); 
     if (RuntimeData.getsCalendarData() != null) { 
      BottomSectionFragment bottomFragment = new BottomSectionFragment(); 
      getSupportFragmentManager().beginTransaction().replace(R.id.fragment2, 
        bottomFragment).commit(); 
     } 
    } 

} 

Answer 1

でこの例外が発生します。

ここに該当するかどうかをテストするには、onSaveInstanceState（）をオーバーライドしてsuperメソッドを呼び出さないようにします。

@Override 
protected void onSaveInstanceState(Bundle outState) { 
    //No call for super(). 
} 

これはあなたがAsyncTask（またはスレッド）を持っている場合、この問題が発生した主な理由の一つは、あることをcommitAllowingStateLoss();