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Fatal Exception: java.lang.IllegalStateException: Failure saving state: active fragment was removed from the FragmentManager

I recently changed my app to target API Level 28 and also started using androidx instead of support libraries. After the change, I'm noticing a crash that has the following traceback

Fatal Exception: java.lang.IllegalStateException: Failure saving state: active MyFragment{22caf6fc (04a7bbf5-8806-4a45-a25d-616ed244bf18) id=0x7f1000ff} was removed from the FragmentManager
       at androidx.fragment.app.FragmentManagerImpl.saveAllState(FragmentManagerImpl.java:2301)
       at androidx.fragment.app.FragmentController.saveAllState(FragmentController.java:150)
       at androidx.fragment.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:496)
       at androidx.appcompat.app.AppCompatActivity.onSaveInstanceState(AppCompatActivity.java:510)
       at com.company.utils.MyAppCompatActivity.onSaveInstanceState(MyAppCompatActivity.java:161)
       at android.app.Activity.performSaveInstanceState(Activity.java:1311)
       at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1288)
       at android.app.ActivityThread.callCallActivityOnSaveInstanceState(ActivityThread.java:4166)
       at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3577)
       at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3633)
       at android.app.ActivityThread.access$1300(ActivityThread.java:164)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1491)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:160)
       at android.app.ActivityThread.main(ActivityThread.java:5541)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:964)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)

All my activities are extending from a base activity MyAppCompatActivity which extends from AppCompatActivity. And in the onSaveInstanceState method of MyAppCompatActivity, I have a few log lines there. I have three fragments in this activity implemented under a ViewPager with FragmentStatePageAdapter and the activity itself is not overriding onSaveInstanceState method.

I went through a few SO posts close to this such as this one and this one, but it looks as if it's happening when we're using FragmentManager's methods to manage the fragments ourselves rather than using a ViewPagerAdapter handle it. I'm not doing that and the closest thing that I'm doing away from the usual flow is overriding FragmentStatePageAdapter's methods instantiateItem and destroyItem to help me have a method to get a fragment's reference in the code as given in this SO answer.

Solution

  • Which Fragment library version did you use? There is an issue with 1.1.0-alpha01.