Get the current fragment object

Question

In my main xml I have     lt FrameLayout         android id    id frameTitle          android padding  5dp          android layout height  wrap content          android layout width  fill parent          android background   drawable title bg  gt               lt fragment               android name  com fragment TitleFragment                android id    id fragmentTag                android layout width  fill parent                android layout height  wrap content    gt      lt  FrameLayout gt    And I m setting fragment object like this   FragmentManager fragmentManager   activity getSupportFragmentManager    FragmentTransaction fragmentTransaction   fragmentManager beginTransaction    Fragment newFragment   new FragmentType1    fragmentTransaction replace R id frameTitle  casinodetailFragment   fragmentTag        fragmentTransaction addToBackStack null   fragmentTransaction commit      It is setting different types of Fragment objects  FragmentType2 FragmentType3      at different time  Now at some point of time I need to identify which object is currently there   In short I need to do something like this   Fragment currentFragment     what is the way to get current fragment object in FrameLayout R id frameTitle   I tried the following    TitleFragment titleFragmentById    TitleFragment  fragmentManager findFragmentById R id frameTitle     and       TitleFragment titleFragmentByTag    TitleFragment  fragmentManager findFragmentByTag  fragmentTag      But both the objects  titleFragmentById and titleFragmentByTag    are null Did I miss something  I m using Compatibility Package  r3 and developing for API level 7   findFragmentById   and findFragmentByTag   will work if we have set fragment using fragmentTransaction replace or fragmentTransaction add  but will return null if we have set the object at xml  like what I have done in my main xml   I think I m missing something in my XML files

User · Answer

This is the simplest solution and work for me.

1.) you add your fragment

ft.replace(R.id.container_layout, fragment_name, "fragment_tag").commit();

2.)

FragmentManager fragmentManager = getSupportFragmentManager();

Fragment currentFragment = fragmentManager.findFragmentById(R.id.container_layout);

if(currentFragment.getTag().equals("fragment_tag"))

{

 //Do something

}

else

{

//Do something

}

User · Answer

Hammer response worked for me  im using to control a floating action button  final FloatingActionButton fab    FloatingActionButton  findViewById R id fab       fab setOnClickListener new View OnClickListener              Override         public void onClick final View view                android app Fragment currentFragment   getFragmentManager   findFragmentById R id content frame               Log d  VIE  String valueOf currentFragment                if  currentFragment instanceof PerfilFragment                    PerfilEdit view  fab

User · Answer

Do a check  which fragment in the activity container  in the onStart method    Override protected void onStart     super onStart    Fragment fragmentCurrent   getSupportFragmentManager findFragmentById R id constraintLayout   activity main   container      Some check   if  fragmentCurrent instanceof MenuFragment

User · Answer

If you are using the BackStack   and ONLY if you are using the back stack  then try this   rivate Fragment returnToPreviousFragment          FragmentManager fm   getSupportFragmentManager         Fragment topFrag   null       int idx   fm getBackStackEntryCount        if  idx  gt  1            BackStackEntry entry   fm getBackStackEntryAt idx - 2           topFrag   fm findFragmentByTag entry getName                fm popBackStack         return topFrag

User · Answer

If you are extending from AbstractActivity  you could use the getFragments   method   for  Fragment f   getFragments          if  f instanceof YourClass               do stuff here

User · Answer

Now at some point of time I need to identify which object is currently there  Call findFragmentById   on FragmentManager and determine which fragment is in your R id frameTitle container  If you are using the androidx edition of Fragment     as you should in modern apps       use getSupportFragmentManager   on your FragmentActivity AppCompatActivity instead of getFragmentManager

User · Answer

you can check which fragment is currently loaded by this         supportFragmentManager addOnBackStackChangedListener           val myFragment   supportFragmentManager fragments last            if  null    myFragment  amp  amp  myFragment is HomeFragment                  HomeFragment is visible or currently loaded           else                 your code

User · Answer

I think you should do   Fragment currentFragment   fragmentManager findFragmentByTag  fragmentTag      The reason is because you set the tag  fragmentTag  to the last fragment you have added  when you called replace

User · Answer

Try this   Fragment currentFragment   getActivity   getFragmentManager   findFragmentById R id fragment container     this will give u the current fragment  then you may compare it to the fragment class and do your stuffs       if  currentFragment instanceof NameOfYourFragmentClass         Log v TAG   find the current fragment

User · Answer

You can create field in your parent Activity Class   public class MainActivity extends AppCompatActivity        public Fragment fr     Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState              And then inside each fragment class   public class SomeFragment extends Fragment     Override     public View onCreateView LayoutInflater inflater                               ViewGroup container  Bundle savedInstanceState               MainActivity  getActivity    fr   this      Your  fr  field is current fragment Object  It s working also with popBackStack

User · Answer

You can get the list of the fragments and look to the last one        FragmentManager fm   getSupportFragmentManager        List lt Fragment gt  fragments   fm getFragments        Fragment lastFragment   fragments get fragments size   - 1     But sometimes  when you navigate back  list size remains same but some of the last elements are null  So in the list I iterated to the last not null fragment and used it       FragmentManager fm   getSupportFragmentManager        if  fm    null            List lt Fragment gt  fragments   fm getFragments            if  fragments    null                for int i   fragments size   - 1  i  gt   0  i--                   Fragment fragment   fragments get i                   if fragment    null                           found the current fragment                         if you want to check for specific fragment class                     if fragment instanceof YourFragmentClass                               do something                                           break

User · Answer

This will give you the current fragment class name --       String fr name   getSupportFragmentManager   findFragmentById R id fragment container  getClass   getSimpleName

User · Answer

It might be late but I hope it helps someone else  also  CommonsWare has posted the correct answer   FragmentManager fm   getSupportFragmentManager    Fragment fragment byID   fm findFragmentById R id fragment id     OR Fragment fragment byTag   fm findFragmentByTag  fragment tag

User · Answer

I think you can use onAttachFragment event may be useful to catch which fragment is active    Override public void onAttachFragment Fragment fragment           TODO Auto-generated method stub     super onAttachFragment fragment        Toast makeText getApplicationContext    String valueOf fragment getId     Toast LENGTH SHORT  show

User · Answer

Maybe the simplest way is   public MyFragment getVisibleFragment        FragmentManager fragmentManager   MainActivity this getSupportFragmentManager        List lt Fragment gt  fragments   fragmentManager getFragments        for Fragment fragment   fragments           if fragment    null  amp  amp  fragment getUserVisibleHint                return  MyFragment fragment            return null      It worked for me

User · Answer

If you are defining the fragment in the activity s XML layour then in the Activity make sure you call setContentView   before calling findFragmentById

User · Answer

I know it s been a while  but I ll this here in case it helps someone out   The right answer by far is  and the selected one  the one from CommonsWare  I was having the same problem as posted  the following  MyFragmentClass fragmentList                 MyFragmentClass  getSupportFragmentManager   findFragmentById R id fragementID     kept on returning null  My mistake was really silly  in my xml file    lt fragment     android tag    id fragementID      android name  com sf lidgit android content MyFragmentClass      android layout width  fill parent      android layout height  wrap content    gt    The mistake was that I had android tag INSTEAD OF android id

[android] Get the current fragment object

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