[android] Get the current fragment object

In my main.xml I have

  <FrameLayout
        android:id="@+id/frameTitle"
        android:padding="5dp"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:background="@drawable/title_bg">
            <fragment
              android:name="com.fragment.TitleFragment"
              android:id="@+id/fragmentTag"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content" />

  </FrameLayout>

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.

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:

<fragment
    android:tag="@+id/fragementID"
    android:name="com.sf.lidgit_android.content.MyFragmentClass"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
/>

The mistake was that I had android:tag INSTEAD OF android:id.

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();

}

you can check which fragment is currently loaded by this

        supportFragmentManager.addOnBackStackChangedListener {
        val myFragment = supportFragmentManager.fragments.last()

        if (null != myFragment && myFragment is HomeFragment) {
            //HomeFragment is visible or currently loaded
        } else {
            //your code
        }
    }

Maybe the simplest way is:

public MyFragment getVisibleFragment(){
    FragmentManager fragmentManager = MainActivity.this.getSupportFragmentManager();
    List<Fragment> fragments = fragmentManager.getFragments();
    for(Fragment fragment : fragments){
        if(fragment != null && fragment.getUserVisibleHint())
            return (MyFragment)fragment;
    }
    return null;
}

It worked for me

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 > 1) {
        BackStackEntry entry = fm.getBackStackEntryAt(idx - 2);
        topFrag = fm.findFragmentByTag(entry.getName());
    }

    fm.popBackStack();

    return topFrag;
}

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()

1. 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);
   }
   

2. Some check:

   if (fragmentCurrent instanceof MenuFragment) 
   

This will give you the current fragment class name -->

String fr_name = getSupportFragmentManager().findFragmentById(R.id.fragment_container).getClass().getSimpleName();

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");
  }

You can get the list of the fragments and look to the last one.

    FragmentManager fm = getSupportFragmentManager();
    List<Fragment> 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<Fragment> fragments = fm.getFragments();
        if (fragments != null) {
            for(int i = fragments.size() - 1; i >= 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;
                }
            }
        }
    }

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");

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).

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

}

@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);
            }
        }
});

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

If you are extending from AbstractActivity, you could use the getFragments() method:

for (Fragment f : getFragments()) {
    if (f instanceof YourClass) {
        // do stuff here
    }
}