Android Nested Fragment: How to pass result values to nested child fragment

Question

Hi am working on nested fragments. My Activity having two Tabs called Frag1 and Frag2. The Frag1 has children Tab named FragA and Frag B. From FragA i am calling one activity and i am returning its result to Fragment Activity. So based on the result i need to reload or recreate the FragA. Please some one tell me, how to pass vales from ParentFragment's onActivityResult() to child Fragment FragA. Thanks in advance.

Top level fragment:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub

    mTabHost = new FragmentTabHost(getActivity());
    mTabHost.setup(getActivity(), getChildFragmentManager(), R.layout.fragment_tabhost);

    arg1 = new Bundle();
    arg1.putString("tab", "tab1");
    mTabHost.addTab(mTabHost.newTabSpec("Tab1").setIndicator("Tab1"),
            FragmentTestA.class, arg1);

    arg1 = new Bundle();
    arg1.putString("tab", "tab2");
    mTabHost.addTab(mTabHost.newTabSpec("Tab2").setIndicator("Tab2"),
            FragmentTestB.class, arg1);

    arg1 = new Bundle();
    arg1.putString("tab", "tab3");
    mTabHost.addTab(mTabHost.newTabSpec("Tab3").setIndicator("Tab3"),
            FragmentTestC.class, arg1);

    return mTabHost;
}

FragmentTestA:

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    mainView = inflater.inflate(R.layout.frag, null);

    // initially load default fragment here
    fg = new DefaultFragment();
    replaceFragment(fg);

    if (getArguments() != null) {
        mCurrentTab = getArguments().getString("tab");
    }

    mNotUsedBtn = (Button) mainView.findViewById(R.id.btn2);
    mNotUsedBtn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
        }
    });

    mUsedBtn = (Button) mainView.findViewById(R.id.btn3);
    mUsedBtn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
        }
    });

    return mainView;
}

DefaultFragment:

      @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    mainView = inflater.inflate(R.layout.deal_list, null);

    mExpSoon = getArguments() != null ? 
            getArguments().getString("expiring_soon") : "";
    mStatus = getArguments() != null ? 
            getArguments().getString("status") : "";
    mCurrentTab = getArguments() != null ? 
            getArguments().getString("tab") : "";
        mListView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View v, int position,
                long id) {
            // TODO Auto-generated method stub
               Calling Activity from here
        }
    }); 



    return mainView;
}

So the intent called and it returns some result. how do we pass values to the last child to perform action based on the result. I am getting result to onActivityResult() from this how to send data to last activity.

Fragment to fragment communication should always go via the hosting activity using interfaces, these interfaces should be attached to the fragment in the onActivityAttached callback of a fragment — Tobrun, Dec 30 '13 at 09:58

Saj · Answer 1 · 2013-12-30T10:25:27.150

you could use ViewFlipper instead of Tab. Here you can use same FragmentActivity class and also onActivityResult(...) method. e.g

   vFlipper = (ViewFlipper) view.findViewById(R.id.ViewFlipper_tab);

     info.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub


            vFlipper.setDisplayedChild(0);
        }
    });

    mat.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub



            vFlipper.setDisplayedChild(1);
        }
    });

score 0 · Answer 2 · answered Oct 26 '15 at 12:56

You should implement this, that is something i saw on the web but i dont remember where:

Interface class

interface Communicator{
    void doSomething();      
    SomeClass getSomething();
}

MainActivity or CurrentActivity(the actitvity where the fragments are called)

public class SomeActivity extends .... implements ....,Communicator{
    SomeClass object;
    .......
    public void doSomething(){
        object=someOperation;
    }
    public Someclass getSomething(){
        return object;
    }
    ........
}

Any fragment

public class yFragment extends fragment implements ....{
    Communicator communicator;
    public onCreate(...................){
        .........
        communicator=(Communicator)getActivity();
        .........
    }
    ......................................
    public someMethod(){
         .............
         communicator.doSomething();
         ............
    }
    ...........
}

Any other fragment even a nested fragment

public class XFragment extends fragment implements ....{
        Communicator communicator;
        public onCreate(...................){
            .........
            communicator=(Communicator)getActivity();
            .........
        }
        ......................................
        public someMethod(){
             .............
             variable=communicator.getSomething();
             ............
        }
        ...........
    }

This works for me i send "data" to my main activity store it there and then when i want it back i recover that data with the interface.
PSDT: ....... means some parameters or methods go here

Android Nested Fragment: How to pass result values to nested child fragment

2 Answers2