How to get a Fragment to remove itself i e its equivalent of finish

Question

I m converting an app to use fragments using the compatibility library  Now currently I have a number of activities  A B C D  which chain onto one another  D has a button  OK  which when pressed calls finish which then bubbles up through onActivityResult   to additionally destroy C and B   For my pre Honycomb fragment version each activity is effectively a wrapper on fragments Af Bf Cf Df  All activities are launched via startActivityForResult   and onActivityResult   within each of the fragments can happily call getActivity   finish    The problem that I am having though is in my Honeycomb version I only have one activity  A  and fragments Bf  Cf  Df are loaded using the FragmentManager   What I don t understand is what to do in Df when  OK  is pressed in order to remove fragments Df  Cf  and Bf    I tried having the fragment popping itself off the stack but this resulted in an exception  onActivityResult   is useless because I have not loaded up the fragment using startActivityForResult     Am I thinking about this completely the wrong way  Should I be implementing some sort of listener that communicates with either the parent fragment or activity in order to do the pop using the transaction manager

User · Answer

If you are using the new Navigation Component  is simple as  findNavController   popBackStack     It will do all the FragmentTransaction in behind for you

User · Answer

You can use the approach below  it works fine   getActivity   getSupportFragmentManager   popBackStack

User · Answer

OnCreate     Add comment fragment             container   FindViewById lt FrameLayout gt  Resource Id frmAttachPicture               mPictureFragment   new fmtAttachPicture                 var trans   SupportFragmentManager BeginTransaction                trans Add container Id  mPictureFragment   fmtPicture                trans Show mPictureFragment   trans Commit      This is how I hide the fragment in click event 1    Close fragment     var trans   SupportFragmentManager BeginTransaction        trans Hide mPictureFragment       trans AddToBackStack null       trans Commit      Then Shows it back int event 2  var trans   SupportFragmentManager BeginTransaction                trans Show mPictureFragment   trans Commit

User · Answer

See if your needs are met by a DialogFragment  DialogFragment has a dismiss   method  Much cleaner in my opinion

User · Answer

You should let the Activity deal with adding and removing Fragments  as CommonsWare says  use a listener  Here is an example   public class MyActivity extends FragmentActivity implements SuicidalFragmentListener           onCreate etc       Override     public void onFragmentSuicide String tag               Check tag if you do this with more than one fragmen  then          getSupportFragmentManager   popBackStack             public interface SuicidalFragmentListener       void onFragmentSuicide String tag      public class MyFragment extends Fragment           onCreateView etc       Override     public void onAttach Activity activity            super onAttach activity           try              suicideListener    SuicidalFragmentListener  activity            catch  ClassCastException e               throw new RuntimeException getActivity   getClass   getSimpleName       must implement the suicide listener to use this fragment   e                         Override     public void onActivityCreated Bundle savedInstanceState            super onActivityCreated savedInstanceState              Attach the close listener to whatever action on the fragment you want         addSuicideTouchListener               private void addSuicideTouchListener             getView   setOnClickListener new View OnClickListener                  Override             public void onClick View v                  suicideListener onFragmentSuicide getTag

User · Answer

To Close a fragment while inside the same fragment   getActivity   onBackPressed

User · Answer

What I don t understand is what to do in Df when  OK  is pressed in order to remove fragments Df  Cf  and Bf    Step  1  Have Df tell D  yo  we got the OK click   via calling a method  either on the activity itself  or on an interface instance supplied by the activity   Step  2  Have D remove the fragments via FragmentManager   The hosting activity  D  is the one that knows what other fragments are in the activity  vs  being in other activities   Hence  in-fragment events that might affect the fragment mix should be propagated to the activity  which will make the appropriate orchestration moves

User · Answer

While it might not be the best approach the closest equivalent I can think of that works is this with the support compatibility library   getActivity   getSupportFragmentManager   beginTransaction   remove this  commit      or   getActivity   getFragmentManager   beginTransaction   remove this  commit      otherwise   In addition you can use the backstack and pop it  However keep in mind that the fragment might not be on the backstack  depending on the fragmenttransaction that got it there    or it might not be the last one that got onto the stack so popping the stack could remove the wrong one

User · Answer

If you need to popback from the fourth fragment in the backstack history to the first  use tags     When you add the first fragment you should use something like this    getFragmentManager beginTransaction addToBackStack  A   add R id container  FragmentA  commit      or   getFragmentManager beginTransaction addToBackStack  A   replace R id container  FragmentA  commit     And when you want to show Fragments B C and D you use this   getFragmentManager beginTransaction addToBackStack  B   replace R id container  FragmentB   B   commit     and other letters      To return to Fragment A  just call popBackStack 0   A    yes  use the flag that you specified when you add it  and note that it must be the same flag in the command addToBackStack    not the one used in command replace or add   You re welcome

User · Answer

parentFragmentManager apply       val f   this MyFragment     beginTransaction   hide f  remove f  commit

User · Answer

Why not just   getActivity   finish

User · Answer

I create simple method for that  popBackStack getSupportFragmentManager       Than place it in my ActivityUtils class  public static void popBackStack FragmentManager manager           FragmentManager BackStackEntry first   manager getBackStackEntryAt 0           manager popBackStack first getId    FragmentManager POP BACK STACK INCLUSIVE           It s work great  have fun

User · Answer

In the Activity AppCompatActivity    Override public void onBackPressed         if  mDrawerLayout isDrawerOpen GravityCompat START                if you want to handle DrawerLayout         mDrawerLayout closeDrawer GravityCompat START         else           if  getFragmentManager   getBackStackEntryCount      0                super onBackPressed              else               getFragmentManager   popBackStack                        and then call in the fragment   getActivity   onBackPressed        or like stated in other answers  call this in the fragment   getActivity   getSupportFragmentManager   beginTransaction   remove this  commit

[android] How to get a Fragment to remove itself, i.e. its equivalent of finish()?

Examples related to android