How to add a Fragment inside a ViewPager using Nested Fragment (Android 4.2)

Assuming you have created the correct xml layouts. It is now very simple to display fragments in a ViewPager that is hosted by another Fragment.

The following is a parent fragment that displays child fragments:

class ParentViewPagerFragment : Fragment() {  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {    val root = inflater.inflate(R.layout.fragment_parent_viewpager, container, false)    val viewPager = root.findViewById(R.id.viewPager) as ViewPager    // Important: Must use the child FragmentManager or you will see side effects.    viewPager.adapter = MyAdapter(childFragmentManager)    val tabStrip = root.findViewById<TabLayout>(R.id.pagerTabStrip)    tabStrip.setupWithViewPager(viewPager)    return root  }  class MyAdapter internal constructor(fm: FragmentManager) : FragmentPagerAdapter(fm) {    override fun getCount(): Int = 4    override fun getItem(position: Int): Fragment {      val args = Bundle().apply { putInt(ChildFragment.POSITION_KEY, position) }      return ChildFragment.newInstance(args)    }    override fun getPageTitle(position: Int): CharSequence = "Tab $position"  }  companion object {    val TAG: String = ParentViewPagerFragment::class.java.name  }}

It is important to use Fragment.getChildFragmentManager() when instantiating the FragmentPagerAdapter. Also note that you cannot use Fragment.setRetainInstance() on the children fragments or you'll get an exception. The imports were omitted for brevity.

Source code can be found at: https://github.com/marcoRS/nested-fragments

Edit:If you want to replace all the content of a page in a ViewPager you could still use nested fragments, but some changes are needed. Check the sample below(the FragmentActivity, setting the ViewPager and the PagerAdapter are the same as the previous snippet of code):

// this will act as a fragment container, representing one page in the ViewPagerpublic static class WrapperFragment extends Fragment implements        ReplaceListener {    public static WrapperFragment newInstance(int position) {        WrapperFragment wp = new WrapperFragment();        Bundle args = new Bundle();        args.putInt("position", position);        wp.setArguments(args);        return wp;    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        FrameLayout fl = new FrameLayout(getActivity());        fl.setId(10000);        if (getChildFragmentManager().findFragmentByTag("initialTag") == null) {            InitialInnerFragment iif = new InitialInnerFragment();            Bundle args = new Bundle();            args.putInt("position", getArguments().getInt("position"));            iif.setArguments(args);            getChildFragmentManager().beginTransaction()                    .add(10000, iif, "initialTag").commit();        }        return fl;    }    // required because it seems the getChildFragmentManager only "sees"    // containers in the View of the parent Fragment.       @Override    public void onReplace(Bundle args) {        if (getChildFragmentManager().findFragmentByTag("afterTag") == null) {            InnerFragment iif = new InnerFragment();            iif.setArguments(args);            getChildFragmentManager().beginTransaction()                    .replace(10000, iif, "afterTag").addToBackStack(null)                    .commit();        }    }}// the fragment that would initially be in the wrapper fragmentpublic static class InitialInnerFragment extends Fragment {    private ReplaceListener mListener;    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        mListener = (ReplaceListener) this.getParentFragment();        LinearLayout ll = new LinearLayout(getActivity());        Button b = new Button(getActivity());        b.setGravity(Gravity.CENTER_HORIZONTAL);        b.setText("Frame " + getArguments().getInt("position"));        b.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                Bundle args = new Bundle();                args.putInt("positionInner",                        getArguments().getInt("position"));                if (mListener != null) {                    mListener.onReplace(args);                }            }        });        ll.setOrientation(LinearLayout.VERTICAL);        ll.addView(b, new LinearLayout.LayoutParams(250,                LinearLayout.LayoutParams.WRAP_CONTENT));        return ll;    }}public static class InnerFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        TextView tv = new TextView(getActivity());        tv.setText("InnerFragment in the outher Fragment with position "                + getArguments().getInt("positionInner"));        return tv;    }}public interface ReplaceListener {    void onReplace(Bundle args);}

At a quick look it works, but issues may appear as I haven't tested it to much.

Can somebody show a simple example of how to do this?

Using nested fragments seems pretty easy, until Commonsware comes with a more elaborated sample you can try the code below:

public class NestedFragments extends FragmentActivity {    @Override    protected void onCreate(Bundle arg0) {        super.onCreate(arg0);        ViewPager vp = new ViewPager(this);        vp.setId(5000);        vp.setAdapter(new MyAdapter(getSupportFragmentManager()));        setContentView(vp);    }    private static class MyAdapter extends FragmentPagerAdapter {        public MyAdapter(FragmentManager fm) {            super(fm);        }        @Override        public Fragment getItem(int position) {            return WrapperFragment.newInstance(position);        }        @Override        public int getCount() {            return 8;        }    }    public static class WrapperFragment extends Fragment {        public static WrapperFragment newInstance(int position) {            WrapperFragment wp = new WrapperFragment();            Bundle args = new Bundle();            args.putInt("position", position);            wp.setArguments(args);            return wp;        }        @Override        public View onCreateView(LayoutInflater inflater, ViewGroup container,                Bundle savedInstanceState) {            LinearLayout ll = new LinearLayout(getActivity());            FrameLayout innerFragContainer = new FrameLayout(getActivity());            innerFragContainer.setId(1111);            Button b = new Button(getActivity());            b.setText("Frame " + getArguments().getInt("position"));            b.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                    InnerFragment innerFragment = new InnerFragment();                    Bundle args = new Bundle();                    args.putInt("positionInner",                            getArguments().getInt("position"));                    innerFragment.setArguments(args);                    FragmentTransaction transaction = getChildFragmentManager()                            .beginTransaction();                    transaction.add(1111, innerFragment).commit();                }            });            ll.setOrientation(LinearLayout.VERTICAL);            ll.addView(b, new LinearLayout.LayoutParams(                    LinearLayout.LayoutParams.MATCH_PARENT,                    LinearLayout.LayoutParams.WRAP_CONTENT));            ll.addView(innerFragContainer, new LinearLayout.LayoutParams(                    LinearLayout.LayoutParams.MATCH_PARENT,                    LinearLayout.LayoutParams.MATCH_PARENT));            return ll;        }    }    public static class InnerFragment extends Fragment {        @Override        public View onCreateView(LayoutInflater inflater, ViewGroup container,                Bundle savedInstanceState) {            TextView tv = new TextView(getActivity());            tv.setText("InnerFragment in the outher Fragment with position "                    + getArguments().getInt("positionInner"));            return tv;        }    }}

I was lazy and made everything in code but I'm sure it can work with inflated xml layouts.

I have created a ViewPager with 3 elements and 2 sub elements for index 2 and 3 and here what I wanted to do..

I have implemented this with the help from previous questions and answers from StackOverFlow and here is the link.

ViewPagerChildFragments