How to pass data from Fragment to Activity Using Interface

 

USE CASE:

We want to call onBackpressed() method in the Activity when there are no Contents in View Content API

 Create an interface  FragmentToActivity.java

public interface FragmentToActivity {

    void communicate(String comm);

}

This the Fragment from where we want to send the data  MyFavouriteFragment.java

private FragmentToActivity mCallback; //Declare the listener

@Override

public void onAttach(Context context) {

    super.onAttach(context);

    try {

        mCallback = (FragmentToActivity) context;

    } catch (ClassCastException e) {

        throw new ClassCastException(context.toString()

                + " must implement FragmentToActivity");

    }

}

@Override

public void onDetach() {

    mCallback = null;

    super.onDetach();

}

private void sendData(String comm)

{

    mCallback.communicate(comm);

}

In the Activity (MyFavouriteActivity.java) implement the interface and do your action

public class MyFavouriteActivity extends FragmentActivity implements FragmentToActivity {

@Override

public void communicate(String comm) {

    if(comm.equals("onBackPressed"))

        onBackPressed();

}

}