Refresh or force redraw the fragment

Question

I have a fragment that inflates an xml layout  My requirement is to update the text size on all my views inside my fragment when my Activity is resumed  I tried      fragment getView   invalidate      which didn t seem to do the work  I also tried      fragment getView   requestLayout      which didn t work either   On another activity  I have a ListFragment which needs to do the same thing  I tried      listfragment getListView   invalidate      which did the trick  refreshing my list view and redrawing all the items inside it   I don t understand why one works but not the other   I have also seen people recommending initiating a fragment transaction and replacing the current fragment with a new one  and it has kept me wondering   Why should I create a whole new fragment and replace my current fragment when all I need is to refresh the text on the views that my fragment contains  Fragment transaction method will prevent me from defining my fragment in the layout xml of my activity and I will have to programatically insert the fragment at the right position    Is there any simple approach to this

User · Answer

This worked for me from within Fragment   Fragment frg   null  Class fragmentClass  fragmentClass   MainFragment class   try       frg    android support v4 app Fragment           fragmentClass newInstance      catch Exception ex        ex printStackTrace       getFragmentManager        beginTransaction        replace R id flContent  frg       commit

User · Answer

let us see the below source code  Here fragment name is DirectoryOfEbooks   After completion of the background task  i am the replacing the frame with current fragment  so the fragment gets refreshed and reloads its data      import android app ProgressDialog      import android content DialogInterface      import android database Cursor      import android database sqlite SQLiteDatabase      import android os AsyncTask      import android os Bundle      import android support v4 app Fragment      import android support v4 app FragmentTransaction      import android support v4 view MenuItemCompat      import android support v7 app AlertDialog      import android support v7 widget DefaultItemAnimator      import android support v7 widget GridLayoutManager      import android support v7 widget LinearLayoutManager      import android support v7 widget RecyclerView      import android support v7 widget SearchView      import android view LayoutInflater      import android view Menu      import android view MenuInflater      import android view MenuItem      import android view View      import android view ViewGroup      import android widget TextView      import android widget Toast       import com github mikephil charting data LineRadarDataSet       import java util ArrayList      import java util List                   A simple   link Fragment  subclass              public class DirectoryOfEbooks extends Fragment            RecyclerView recyclerView          branchesAdapter adapter          LinearLayoutManager linearLayoutManager          Cursor c          FragmentTransaction fragmentTransaction          SQLiteDatabase db          List lt branch sync gt  directoryarraylist           public DirectoryOfEbooks                    Required empty public constructor                    Override         public View onCreateView LayoutInflater inflater  ViewGroup container                                   Bundle savedInstanceState                  View view   inflater inflate R layout fragment directory of ebooks  container  false               directoryarraylist   new ArrayList lt  gt                 db   getActivity   openOrCreateDatabase  notify   android content Context MODE PRIVATE  null               c   db rawQuery  select   FROM branch     null                if  c getCount      0                    c moveToFirst                    while  true                          String ISBN   c getString c getColumnIndex  ISBN                         String branch   c getString c getColumnIndex  branch                          branch sync branchSync   new branch sync branch                       directoryarraylist add branchSync                       if  c isLast                            break                      else                         c moveToNext                                       recyclerView    RecyclerView  view findViewById R id directoryOfEbooks                   adapter   new branchesAdapter directoryarraylist  this getContext                     adapter setHasStableIds true                   recyclerView setItemAnimator new DefaultItemAnimator                     System out println  ebooks                    recyclerView setHasFixedSize true                   linearLayoutManager   new LinearLayoutManager this getContext                     recyclerView setLayoutManager linearLayoutManager                   recyclerView setAdapter adapter                   System out println adapter getItemCount    adpater count                                  Inflate the layout for this fragment             return view                    public void onCreate Bundle savedInstanceState                super onCreate savedInstanceState                 setContentView R layout fragment books               setHasOptionsMenu true                     public void onPrepareOptionsMenu Menu menu                MenuInflater inflater   getActivity   getMenuInflater                inflater inflate R menu refresh  menu               MenuItem menuItem   menu findItem R id refresh1               menuItem setVisible true                     public boolean onOptionsItemSelected MenuItem item                if  item getItemId      R id refresh1                    new AlertDialog Builder getContext    setMessage  Refresh takes more than a Minute   setPositiveButton  Refresh Now   new DialogInterface OnClickListener                          public void onClick DialogInterface dialog  int which                             new refreshebooks   execute                                             setNegativeButton  Refresh Later   new DialogInterface OnClickListener                         public void onClick DialogInterface dialog  int which                                              setCancelable false  show                               return super onOptionsItemSelected item                  public class refreshebooks extends AsyncTask lt String String String gt           ProgressDialog progressDialog           Override         protected void onPreExecute                 super onPreExecute              progressDialog new ProgressDialog getContext                 progressDialog setMessage   tRefreshing Ebooks                      progressDialog setCancelable false               progressDialog show                        Override         protected String doInBackground String    params                Ebooksync syncEbooks new Ebooksync                String status syncEbooks syncdata getContext                 return status                       Override         protected void onPostExecute String s                super onPostExecute s               if s equals  error                     progressDialog dismiss                    Toast makeText getContext    Refresh Failed  Toast LENGTH SHORT  show                              else                  fragmentTransaction   getActivity   getSupportFragmentManager   beginTransaction                    fragmentTransaction replace R id mainframe  new DirectoryOfEbooks                     fragmentTransaction commit                    progressDialog dismiss                    adapter notifyDataSetChanged                    Toast makeText getContext    Refresh Successfull  Toast LENGTH SHORT  show

User · Answer

I am using remove and replace both for refreshing content of Fragment like  final FragmentTransaction fragmentTransaction   getSupportFragmentManager   beginTransaction    fragmentTransaction remove resetFragment  commit    fragmentTransaction replace R id frame container resetFragment  commit

User · Answer

I do not think there is a method for that  The fragment rebuilds it s UI on onCreateView      but that happens when the fragment is created or recreated    You ll have to implement your own updateUI method or where you will specify what elements and how they should update  It s rather a good practice  since you need to do that when the fragment is created anyway   However if this is not enough you could do something like replacing fragment with the same one forcing it to call onCreateView    FragmentTransaction tr   getFragmentManager   beginTransaction    tr replace R id your fragment container  yourFragmentInstance   tr commit     NOTE  To refresh ListView you need to call notifyDataSetChanged   on the ListView s adapter

User · Answer

In my case  detach and attach worked   getSupportFragmentManager       beginTransaction       detach contentFragment      attach contentFragment      commit

User · Answer

To solve the problem  I use this   Fragment frg   null  frg   getFragmentManager   findFragmentByTag  Feedback    final android support v4 app FragmentTransaction ft   getFragmentManager   beginTransaction    ft detach frg   ft attach frg   ft commit

User · Answer

Use the following code for refreshing fragment again   FragmentTransaction ftr   getFragmentManager   beginTransaction                              ftr detach EnterYourFragmentName this  attach EnterYourFragmentName this  commit

User · Answer

detach   detach   not working after support library update 25 1 0  may be earlier   This solution works fine after update   getSupportFragmentManager        beginTransaction        detach oldFragment       commitNowAllowingStateLoss     getSupportFragmentManager        beginTransaction        attach oldFragment       commitAllowingStateLoss

[android] Refresh or force redraw the fragment

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