Getting the error Java lang IllegalStateException Activity has been destroyed when using tabs with ViewPager

Question

I have an application that consists of using ActionBarSherlock in tab mode I have 5 tabs and the content of each tab is handled using fragments  For tab2 though  I have a fragment the xml file of which holds a ViewPager element which in turn has some fragment pages  When I initially start the application the application  I am able to switch between tabs no problem but when I press on tab2 for the second time I get the error mentioned above  The main activity is as follows   public class MainActivity extends SherlockFragmentActivity        Override     protected void onCreate Bundle savedInstanceState                 super onCreate savedInstanceState           setContentView R layout activity main            ActionBar actionBar   getSupportActionBar             ActionBar Tab tab1   actionBar newTab   setText  Tab1            ActionBar Tab tab3   actionBar newTab   setText  Tab3            ActionBar Tab tab2   actionBar newTab   setText  Tab2            ActionBar Tab tab4   actionBar newTab   setText  Tab4            ActionBar Tab tab5   actionBar newTab   setText  Tab5             Fragment fragment1   new Tab1            Fragment fragment3   new Tab3            Fragment fragment2   new Tab2            Fragment fragment5   new Tab5            Fragment fragment4   new Tab4             tab1 setTabListener new MyTabListener fragment1            tab3 setTabListener new MyTabListener fragment3            tab2 setTabListener new MyTabListener fragment2            tab5 setTabListener new MyTabListener fragment5            tab4 setTabListener new MyTabListener fragment4             actionBar addTab tab1           actionBar addTab tab2           actionBar addTab tab3           actionBar addTab tab4           actionBar addTab tab5             actionBar setNavigationMode ActionBar NAVIGATION MODE TABS              class MyTabListener implements ActionBar TabListener               Fragment fragment           public MyTabListener Fragment fragment                        this fragment   fragment                      Override         public void onTabSelected com actionbarsherlock app ActionBar Tab tab FragmentTransaction ft                         ft replace R id fragment container fragment                       Override         public void onTabUnselected com actionbarsherlock app ActionBar Tab tab FragmentTransaction ft                                  Override         public void onTabReselected com actionbarsherlock app ActionBar Tab tab FragmentTransaction ft                                  The fragment class without the ViewPager is as follows   public class Tab1 extends Fragment         Override     public View onCreateView LayoutInflater inflater  ViewGroup container Bundle savedInstanceState                return inflater inflate R layout activity tab1  container  false             The fragment class with the ViewPager is as follows   public class Tab2 extends Fragment        ViewPager mViewPager      private MyFragmentPagerAdapter mMyFragmentPagerAdapter        private static int NUMBER OF PAGES   5        Override     public View onCreateView LayoutInflater inflater  ViewGroup container Bundle savedInstanceState                View view    inflater inflate R layout activity tab2  container  false            return view              Override     public void onViewCreated View view Bundle savedInstanceState                super onViewCreated view  savedInstanceState           mViewPager    ViewPager  view findViewById R id viewpager           mMyFragmentPagerAdapter   new MyFragmentPagerAdapter getChildFragmentManager               mViewPager setAdapter mMyFragmentPagerAdapter                private static class MyFragmentPagerAdapter extends FragmentPagerAdapter                    public MyFragmentPagerAdapter FragmentManager fm                            super fm                           Override           public Fragment getItem int index                            return PageFragment newInstance  My Message     index                         Override           public int getCount                             return NUMBER OF PAGES                         From what I ve read in different places  and please correct me if I m wrong   this happens because the fragment manager on the second pass tries to reuse the fragments from the activity which doesn t exist anymore thus giving the error But I m not sure why this happens over here since I m not using  fragment activity  According to logcat the error is in the Tab2 class  onViewCreated method on the line that says mViewPager setAdapter mMyFragmentPagerAdapter   Any help is greatly appreciated   Thanks   03-04 12 01 05 468  E AndroidRuntime 2474   FATAL EXCEPTION  main 03-04 12 01 05 468  E AndroidRuntime 2474   java lang IllegalStateException  Activity has been destroyed 03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app FragmentManagerImpl enqueueAction FragmentManager java 1342  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app BackStackRecord commitInternal BackStackRecord java 595  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app BackStackRecord commitAllowingStateLoss BackStackRecord java 578  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app FragmentPagerAdapter finishUpdate FragmentPagerAdapter java 139  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 view ViewPager populate ViewPager java 1011  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 view ViewPager populate ViewPager java 880  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 view ViewPager setAdapter ViewPager java 433  03-04 12 01 05 468  E AndroidRuntime 2474       at com example tabs Tab2 onViewCreated Tab2 java 31  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app FragmentManagerImpl moveToState FragmentManager java 925  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app FragmentManagerImpl moveToState FragmentManager java 1088  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app BackStackRecord run BackStackRecord java 682  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app FragmentManagerImpl execPendingActions FragmentManager java 1444  03-04 12 01 05 468  E AndroidRuntime 2474       at android support v4 app FragmentManagerImpl 1 run FragmentManager java 429  03-04 12 01 05 468  E AndroidRuntime 2474       at android os Handler handleCallback Handler java 587  03-04 12 01 05 468  E AndroidRuntime 2474       at android os Handler dispatchMessage Handler java 92  03-04 12 01 05 468  E AndroidRuntime 2474       at android os Looper loop Looper java 123  03-04 12 01 05 468  E AndroidRuntime 2474       at android app ActivityThread main ActivityThread java 3687  03-04 12 01 05 468  E AndroidRuntime 2474       at java lang reflect Method invokeNative Native Method  03-04 12 01 05 468  E AndroidRuntime 2474       at java lang reflect Method invoke Method java 507  03-04 12 01 05 468  E AndroidRuntime 2474       at com android internal os ZygoteInit MethodAndArgsCaller run ZygoteInit java 842  03-04 12 01 05 468  E AndroidRuntime 2474       at com android internal os ZygoteInit main ZygoteInit java 600  03-04 12 01 05 468  E AndroidRuntime 2474       at dalvik system NativeStart main Native Method

User · Answer

The bug has been fixed in the latest androidx version  And the famous workaround will cause crash now  so we need not it now

User · Answer

I had this problem and I couldn t find the solution here  so I want to share my solution in case someone else has this problem again   I had this code   public void finishAction       onDestroy      finish        and solved the problem by deleting the line  onDestroy      public void finishAction       finish        The reason I wrote the initial code  I know that when you execute  finish    the activity calls  onDestroy     but I m using threads and I wanted to ensure that all the threads are destroyed before starting the next activity  and it looks like  finish    is not always immediate  I need to process reduce a lot of    Bitmap    and display big    bitmaps    and I   m working on improving the use of the memory in my app  Now I will kill the threads using a different method and I   ll execute this method from  onDestroy     and when I think I need to kill all the threads   public void finishAction       onDestroyThreads      finish

User · Answer

I encountered the same issue when calling super onCreate   at the end of my method  The reason  attachActivity   is called in onCreate   of FragmentActivity  When overriding onCreate   and  for example  creating tabs  the Tab manager will try to switch to a fragment while not having the activity attached to the FragmentManager   Simple solution  Move the call to super onCreate   to the head of the function body   In general  it seems there are loads of reasons this issue may occur  This is just another one      Matthias

User · Answer

This one drove me crazy for Xamarin   I ran into this with a ViewPager implementation for TabLayout WITHIN a Fragment  that is itself implemented in the DrawerLayout    - DrawerLayout    - DrawerFragment      - TabLayout      - TabViewPager        - TabViewPagerFragments   So you have to implement the following code in your DrawerFragment  Be aware to choose the correct FragmentManager-Path  Because you might have two different FragmentManager References    Android Support V4 App FragmentManager Android App FragmentManager   --  Choose the one you use  If you want to make use of the ChildFragmentManager  you had to use the class declaration Android App FragmentManager for your ViewPager   Android Support V4 App FragmentManager  Implement the following Method in your  Main  Fragment  - in this example  DrawerFragment  public override void OnDetach         base OnDetach        try           Fragment x   this          var classRefProp   typeof Fragment  GetProperty  class ref   BindingFlags NonPublic   BindingFlags Static           IntPtr classRef    IntPtr classRefProp GetValue x           var field   JNIEnv GetFieldID classRef   mChildFragmentManager    Landroid support v4 app FragmentManagerImpl             JNIEnv SetField base Handle  field  IntPtr Zero             catch  Exception e            Log Debug  Error   e                Android App FragmentManager  public class TabViewPager  Android Support V13 App FragmentPagerAdapter      That means you had to init the ViewPager with Android App FragmentManager   Implement the following Method in your  Main  Fragment  - in this example  DrawerFragment  public override void OnDetach         base OnDetach        try           Fragment x   this          var classRefProp   typeof Fragment  GetProperty  class ref   BindingFlags NonPublic   BindingFlags Static           IntPtr classRef    IntPtr classRefProp GetValue x           var field   JNIEnv GetFieldID classRef   mChildFragmentManager    Landroid app FragmentManagerImpl             JNIEnv SetField base Handle  field  IntPtr Zero             catch  Exception e            Log Debug  Error   e

User · Answer

This seems to be a bug in the newly added support for nested fragments  Basically  the child FragmentManager ends up with a broken internal state when it is detached from the activity  A short-term workaround that fixed it for me is to add the following to onDetach   of every Fragment which you call getChildFragmentManager   on    Override public void onDetach         super onDetach         try           Field childFragmentManager   Fragment class getDeclaredField  mChildFragmentManager            childFragmentManager setAccessible true           childFragmentManager set this  null          catch  NoSuchFieldException e            throw new RuntimeException e         catch  IllegalAccessException e            throw new RuntimeException e

User · Answer

I had this issue and realized it was because I was calling setContentView int id  twice in my Activity s onCreate

User · Answer

i found that i had a timer running in the background  when the activity is killed  yet the timer still running  in the timer finish callback i access fragment object to do some work  and here is the bug     the fragment exists but the activity isn t  if you have service of timer or any background threads  make sure to not access fragments objects

User · Answer

I got the very same error when trying to access the child FragmentManager before the fragment was fully initialized  i e  attached to the Activity or at least onCreateView   called   Else the FragmentManager gets initialized with a null Activity causing the aforementioned exception

User · Answer

I encountered the same issue and lateron found out that  I have missed call to super onCreate  savedInstanceState    in onCreate   of FragmentActivity

User · Answer

I had this error because I was using LocalBroadcastManager and I did   unregisterReceiver intentReloadFragmentReceiver     instead of   LocalBroadcastManager getInstance this  unregisterReceiver intentReloadFragmentReceiver

User · Answer

I force the fragment containing the child fragment to NULL in onPause and it fixes my problem  fragment   null

User · Answer

I m having exactly the same problem  The only workaround I ve found  is to replace the fragments by a new instance  each time the tabs are changed   ft replace R id fragment container  Fragment instantiate PlayerMainActivity this  fragment getClass   getName        Not a real solution  but i haven t found a way to reuse the previous fragment instance

User · Answer

Wanted to add that my problem was in an activity where I tried to make a FragmentTransaction in onCreate BEFORE I called super onCreate    I just moved super onCreate   to top of function and was worked fine

User · Answer

I know this is an old post  but the suggested answers didn t work on my end  I want to leave this here just in case someone will find it useful    What i did is    Override public void onResume         super onResume           add all fragments     FragmentTransaction fragmentTransaction   getChildFragmentManager   beginTransaction        for Fragment fragment   fragmentPages           String tag   fragment getClass   getSimpleName            fragmentTransaction add R id contentPanel  fragment  tag           if fragmentPages indexOf fragment     currentPosition               fragmentTransaction hide fragment             else               lastTag   tag                      fragmentTransaction commit        Then in    Override public void onPause         super onPause           remove all attached fragments     for Fragment fragment  fragmentPages           getChildFragmentManager   beginTransaction   remove fragment  commit

[android] Getting the error "Java.lang.IllegalStateException Activity has been destroyed" when using tabs with ViewPager

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