Fragment Inside Fragment

Question

AFAIK, fragments cannot hold other fragments.

---

UPDATE

With current versions of the Android Support package -- or native fragments on API Level 17 and higher -- you can nest fragments, by means of getChildFragmentManager(). Note that this means that you need to use the Android Support package version of fragments on API Levels 11-16, because even though there is a native version of fragments on those devices, that version does not have getChildFragmentManager().

I needed some more context, so I made an example to show how this is done. The most helpful thing I read while preparing was this:

• Creating and Using Fragments

Activity

activity_main.xml

Add a FrameLayout to your activity to hold the parent fragment.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Activity"/>

    <FrameLayout
        android:id="@+id/parent_fragment_container"
        android:layout_width="match_parent"
        android:layout_height="200dp"/>

 </LinearLayout>

MainActivity.java

Load the parent fragment and implement the fragment listeners. (See fragment communication.)

import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements ParentFragment.OnFragmentInteractionListener, ChildFragment.OnFragmentInteractionListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Begin the transaction
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.parent_fragment_container, new ParentFragment());
        ft.commit();
    }

    @Override
    public void messageFromParentFragment(Uri uri) {
        Log.i("TAG", "received communication from parent fragment");
    }

    @Override
    public void messageFromChildFragment(Uri uri) {
        Log.i("TAG", "received communication from child fragment");
    }
}

Parent Fragment

fragment_parent.xml

Add another FrameLayout container for the child fragment.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_margin="20dp"
              android:background="#91d0c2">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Parent fragment"/>

    <FrameLayout
        android:id="@+id/child_fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>

</LinearLayout>

ParentFragment.java

Use getChildFragmentManager in onViewCreated to set up the child fragment.

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;    

public class ParentFragment extends Fragment {

    private OnFragmentInteractionListener mListener;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_parent, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        Fragment childFragment = new ChildFragment();
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.replace(R.id.child_fragment_container, childFragment).commit();
    }


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void messageFromParentFragment(Uri uri);
    }
}

Child Fragment

fragment_child.xml

There is nothing special here.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_margin="20dp"
              android:background="#f1ff91">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Child fragment"/>
</LinearLayout>

ChildFragment.java

There is nothing too special here, either.

import android.support.v4.app.Fragment;

public class ChildFragment extends Fragment {

    private OnFragmentInteractionListener mListener;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_child, container, false);
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void messageFromChildFragment(Uri uri);
    }
}

Notes

• The support library is being used so that nested fragments can be used before Android 4.2.

Since Android 4.2 (API 17) nested fragments become available http://developer.android.com/about/versions/android-4.2.html#NestedFragments

To place fragment inside other fragment use getChildFragmentManager()

It also available in support library!

Fragments can be added inside other fragments but then you will need to remove it from parent Fragment each time when onDestroyView() method of parent fragment is called. And again add it in Parent Fragment's onCreateView() method.

Just do like this :

@Override
    public void onDestroyView()
    {
                FragmentManager mFragmentMgr= getFragmentManager();
        FragmentTransaction mTransaction = mFragmentMgr.beginTransaction();
                Fragment childFragment =mFragmentMgr.findFragmentByTag("qa_fragment")
        mTransaction.remove(childFragment);
        mTransaction.commit();
        super.onDestroyView();
    }