Refresh Fragment at reload

Question

In an android application I m loading data from a Db into a TableView inside a Fragment  But when I reload the Fragment it displays the previous data  Can I repopulate the Fragment with current data instead of previous data

User · Answer

MyFragment fragment    MyFragment  getSupportFragmentManager   findFragmentByTag FRAGMENT TAG           getSupportFragmentManager   beginTransaction   detach fragment  attach fragment  commit      this will only work if u use FragmentManager to initialize the fragment  If u have it as a  lt fragment       gt  in XML  it won t call the onCreateView again  Wasted my 30 minutes to figure this out

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Easiest way  make a public static method containing viewpager setAdapter  make adapter and viewpager static  public static void refreshFragments            viewPager setAdapter adapter           call anywhere  any activity  any fragment   MainActivity refreshFragments

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For example with TabLayout  just implement OnTabSelectedListener  To reload the page  you may use implement SwipeRefreshLayout OnRefreshListener i e  public class YourFragment extends Fragment  implements SwipeRefreshLayout OnRefreshListener   the onRefresh   method will be  Override from the interface i e    Override public void onRefresh      loadData       Here s the layout   lt com google android material tabs TabLayout     android id  quot   id tablayout quot      android layout width  quot match parent quot      android layout height  quot wrap content quot      android background  quot  color colorPrimaryLighter quot      app tabGravity  quot fill quot      app tabIndicatorColor  quot  color white quot      app tabMode  quot fixed quot      app tabSelectedTextColor  quot  color colorTextPrimary quot      app tabTextColor  quot  color colorTextDisable quot    gt   Code in your activity TabLayout tabLayout    TabLayout  findViewById R id tablayout   tabLayout setupWithViewPager viewPager       tabLayout addOnTabSelectedListener new TabLayout OnTabSelectedListener              Override         public void onTabSelected TabLayout Tab tab                if  tab getPosition      0                    yourFragment1 onRefresh                  else if  tab getPosition      1                    yourFragment2 onRefresh                                      Override         public void onTabUnselected TabLayout Tab tab                         Override         public void onTabReselected TabLayout Tab tab

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In case you do not have the fragment tag  the following code works well for me   Fragment currentFragment   getActivity   getFragmentManager   findFragmentById R id fragment container   if  currentFragment instanceof  NAME OF YOUR FRAGMENT CLASS      FragmentTransaction fragTransaction      getActivity    getFragmentManager   beginTransaction     fragTransaction detach currentFragment    fragTransaction attach currentFragment    fragTransaction commit

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This will refresh current fragment    FragmentTransaction ft   getFragmentManager   beginTransaction    if  Build VERSION SDK INT  gt   26       ft setReorderingAllowed false     ft detach this  attach this  commit

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protected void onResume             super onResume            viewPagerAdapter notifyDataSetChanged            Do write viewpagerAdapter notifyDataSetChanged    in onResume   in MainActivity  Good Luck

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Reload current fragment Fragment frag   new Order    FragmentManager fragmentManager   getActivity   getSupportFragmentManager    fragmentManager beginTransaction   replace R id fragment home  frag  commit

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You cannot reload the fragment while it is attached to an Activity  where you get  Fragment Already Added  exception   So the fragment has to be first detached from its activity and then attached  All can be done using the fluent api in one line   getFragmentManager   beginTransaction   detach this  attach this  commit      Update  This is to incorporate the changes made to API 26 and above   FragmentTransaction transaction   mActivity getFragmentManager                            beginTransaction                    if  Build VERSION SDK INT  gt   26                        transaction setReorderingAllowed false                                     transaction detach this  attach                          this  commit      For more description of the update please see https   stackoverflow com a 51327440 4514796

User · Answer

Make use of onResume method    both on the fragment activity and the activity holding the fragment

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getActivity   getSupportFragmentManager   beginTransaction   replace GeneralInfo this getId    new GeneralInfo    commit      GeneralInfo it s my Fragment class GeneralInfo java  I put it as a method in the fragment class   public void Reload        getActivity   getSupportFragmentManager   beginTransaction   replace LogActivity this getId    new LogActivity    commit

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I had the same issue but none of the above worked for mine  either there was a backstack problem  after loading when user pressed back it would to go the same fragment again  or it didnt call the onCreaetView  finally i did this   public void transactFragment Fragment fragment  boolean reload        FragmentTransaction transaction   getSupportFragmentManager   beginTransaction        transaction setTransition FragmentTransaction TRANSIT FRAGMENT FADE       if  reload            getSupportFragmentManager   popBackStack              transaction replace R id main activity frame layout  fragment       transaction addToBackStack null       transaction commit        good point is you dont need the tag or id of the fragment either  if you want to reload

User · Answer

I think you want to refresh the fragment contents upon db update  If so  detach the fragment and reattach it     Reload current fragment Fragment frg   null  frg   getSupportFragmentManager   findFragmentByTag  Your Fragment TAG    final FragmentTransaction ft   getSupportFragmentManager   beginTransaction    ft detach frg   ft attach frg   ft commit      Your Fragment TAG is the name you gave your fragment when you created it  This code is for support library   If you re not supporting older devices  just use getFragmentManager instead of getSupportFragmentManager   EDIT   This method requires the Fragment to have a tag  In case you don t have it  then  Hammer s method is what you need

User · Answer

To refresh the fragment accepted answer will not work on Nougat and above version  To make it work on all os you can do following       if  Build VERSION SDK INT  gt   Build VERSION CODES N            fragmentManager beginTransaction   detach this  commitNow            fragmentManager beginTransaction   attach this  commitNow          else           fragmentManager beginTransaction   detach this  attach this  commit

User · Answer

Here what i did and it worked for me i use firebase and when user is logIn i wanted to refresh current Fragment first you will need to requer context from activity because fragment dont have a way to get context unless you set it from Activity or context here is the code i used and worked in kotlin language i think you could use the same in java class     override fun setUserVisibleHint isVisibleToUser  Boolean        super setUserVisibleHint isVisibleToUser      val context   requireActivity       if  auth currentUser    null            if  isVisibleToUser               context supportFragmentManager beginTransaction   detach this  attach this  commit

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Use a ContentProvider and load you data using a  CursorLoader   With this architecture your data will be automatically reloaded on database changes  Use third-party frameworks for your ContentProvider - you don t really want to implement it by yourself

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you can refresh your fragment when it is visible to user  just add this code into your Fragment this will refresh your fragment when it is visible    Override public void setUserVisibleHint boolean isVisibleToUser        super setUserVisibleHint isVisibleToUser       if  isVisibleToUser               Refresh your fragment here             getFragmentManager   beginTransaction   detach this  attach this  commit            Log i  IsRefresh    Yes

[android] Refresh Fragment at reload

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