multiple fragments from ONE ActionTab

Question

So I'm trying to find out if this is possible. I need to load two fragments into two containers in the same activity from a single tab being selected.

I found this Android - Multiple fragments in ONE tab

but no one ever answered this question.

So here is a sample of the code and what I've tried.

listener

surveyTabListener = new TabListener<Load_Fragment>(this,
            R.id.header_fragment_container, Load_Fragment.class);

onTabSelected

public void onTabSelected(Tab tab, FragmentTransaction ft) {

        if (fragment == null) {
            String fragmentName = fragmentClass.getName();
            fragment = Fragment.instantiate(activity, fragmentName);
            ft.add(fragmentContainer, fragment, fragmentName);
        } else
            ft.attach(fragment);
}

Now I've tried to add a second listener to inflate the 2nd fragment like this

surveyTabListener2 = new TabListener<Store_Fragment>(this, 
            R.id.store_fragment_container, Store_Fragment.class);

and I've also tried to use a second if else statement in onTabSelected like this

public void onTabSelected(Tab tab, FragmentTransaction ft) {

        if (fragment == null) {
            String fragmentName = fragmentClass.getName();
            fragment = Fragment.instantiate(activity, fragmentName);
            ft.add(fragmentContainer, fragment, fragmentName);
        } else
            ft.attach(fragment);                        

        if (fragment2 == null) {
            String fragmentName2 = fragmentClass2.getName();
            fragment2 = Fragment.instantiate(activity, fragmentName2);
            ft.add(fragmentContainer2, fragment2, fragmentName2);
        } else
            ft.attach(fragment2);

    }

Neither work, I either get a NPE (null pointer) or absolutely nothing happens, but I get no errors.

This seems like something that should be done fairly often but I can't seem to figure it out.

Answer 1

It dawned on me that I was going about this the wrong way. I figured out a way to do exactly what I was looking for and it was fairly simple. If anyone else has this problem here is the solution.

public void onTabSelected(Tab tab, FragmentTransaction ft) {
        //get the name of the tab currently selected
        String name = (String) tab.getText().toString();

        // compare it to the tab you  would like to do something with        
        if (name == "Assets") {
            //load the 1st fragment
            fragment = new Store_Fragment();
            getFragmentManager().beginTransaction()
                    .setCustomAnimations(android.R.animator.fade_in,
                            android.R.animator.fade_out)
                    .replace(R.id.store_fragment_container, fragment).commit();

            //load the 2nd fragment
            fragment2 = new Load_Fragment();
            getFragmentManager().beginTransaction()
                    .setCustomAnimations(android.R.animator.fade_in,
                            android.R.animator.fade_out)
                    .replace(R.id.header_fragment_container, fragment2).commit();
        }

...and that's it. I hope this helps others.

Answer 2

You need to use an empty fragment as a container for your two fragments, I'm gonna post some code to show you how I dit it.

That's the fragment container:

public static class FragmentInsideContainer extends Fragment {

        ListView mainListView;
        ArrayAdapter<Producer> listAdapter;
        TextView inputSearch;
        static FragmentInsideContainer containerReference;
        String idProd;

        public FragmentInsideContainer() {

        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.layoutcontaineprod, container, false);

            FragmentInsideContainer.containerReference = this;

            FragmentDetailProd fragmentDetailProd = new FragmentDetailProd();
            FragmentDetailProd.id = this.idProd;

            DummySectionFragment2.currentDetailProdFragment = fragmentDetailProd;

            FragmentListWine fragmentListWine = new FragmentListWine();
            fragmentListWine.id = this.idProd;

            DummySectionFragment2.currentListWineFragment = fragmentListWine;

            FragmentInsideContainer.containerReference.getChildFragmentManager().beginTransaction().replace(R.id.containerDetail, fragmentDetailProd).commit();
            FragmentInsideContainer.containerReference.getChildFragmentManager().executePendingTransactions();
            FragmentInsideContainer.containerReference.getChildFragmentManager().beginTransaction().add(R.id.containerDetail, fragmentListWine).commit();
            FragmentInsideContainer.containerReference.getChildFragmentManager().executePendingTransactions();

            return rootView;
        }