Android refresh a fragment list from its parent activity

Your activity can call methods in the fragment by acquiring a reference to the Fragment.

(1) Provide a tag when you add your fragment.

transaction.add(R.id.fragment_container, myFragment, "myfragmentTag");

(2) In your hosting activity you can find the fragment and have access to it's methods.

FragmentManager fm = getSupportFragmentManager();
myFragment f = (myFragment) fm.findFragmentByTag("myfragmentTag");
f.refreshAdapter()

(3) refreshAdapter() could now call adapter.notifyDataSetChanged().

This is one of the recommended ways to communicate up to a fragment. The interface implementation is mainly for communicating back to the activity.

Biraj Zalavadia's answer is 100% right, you will call nay fragment methods from using interface.... this interface methods is running without error...

use this in MainActivity above oncreate private FragmentRefreshListener fragmentRefreshListener;

public FragmentRefreshListener getFragmentRefreshListener() {
    return fragmentRefreshListener;
}

public void setFragmentRefreshListener(
        FragmentRefreshListener fragmentRefreshListener) {
    this.fragmentRefreshListener = fragmentRefreshListener;
}

inside of Activity

private void refreshcall(String result2) {
    // TODO Auto-generated method stub
    if (getFragmentRefreshListener() != null) {
        getFragmentRefreshListener().onRefresh(result2);
    }

}

and put this in needed Fragment

private FragmentRefreshListener fragmentRefreshListener;

    public FragmentRefreshListener getFragmentRefreshListener() {
        return fragmentRefreshListener;
    }

    public void setFragmentRefreshListener(
            FragmentRefreshListener fragmentRefreshListener) {
        this.fragmentRefreshListener = fragmentRefreshListener;
    }

You can easily achieve this using INTERFACE

MainActivity.java

public class MainActivity extends Activity {

    public FragmentRefreshListener getFragmentRefreshListener() {
        return fragmentRefreshListener;
    }

    public void setFragmentRefreshListener(FragmentRefreshListener fragmentRefreshListener) {
        this.fragmentRefreshListener = fragmentRefreshListener;
    }

    private FragmentRefreshListener fragmentRefreshListener;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Button b = (Button)findViewById(R.id.btnRefreshFragment);

        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(getFragmentRefreshListener()!=null){
                    getFragmentRefreshListener().onRefresh();
                }
            }
        });


    }


    public interface FragmentRefreshListener{
        void onRefresh();
    }

}

MyFragment.java

public class MyFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = null; // some view

        /// Your Code


        ((MainActivity)getActivity()).setFragmentRefreshListener(new MainActivity.FragmentRefreshListener() {
            @Override
            public void onRefresh() {

                // Refresh Your Fragment
            }
        });


        return v;
    }
}

• Just make your update/refresh method public and call it from your Activity.

OR

• Use LocalBroadcastManager or EventBus to send event from your Activity, and by subscribing to this event in a Fragment - react to it and call refresh/update method.