fragmentlistener-snippet

fragmentlistener-snippet.java

// Class consuming the interaction
public class ExempleActivity extends Activity implements ExempleFragment.OnFragmentInteractionListener {
    ...

    @Override
    public void onFragmentInteraction(Uri uri) {
        // Consumption of the interaction
    }
}

// Class producing the interaction
public class ExempleFragment extends Fragment {

    private OnFragmentInteractionListener mListener;
    ...

    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            // Production of the interaction
            mListener.onFragmentInteraction(uri);
        }
    }

    // Attachment of the listener
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    // Detachment of the listener
    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    // Declaration of the interaction method
    public interface OnFragmentInteractionListener {
        void onFragmentInteraction(Uri uri);
    }
}