Problem with Fragment

Question

I created a Fragment and I’m trying to call it when I click on a button, but it gives an error and it appears in the console

com.ample.Gustavo.easypasse.Reloade@30d409a0 must implement Onfragmentinteractionlistener

And point to that line of code:

@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");
    }
}

How do I correct that?

Answer 1

Activity, to which this Fragment is associated, must implement the interface Onfragmentinteractionlistener.

That is, you must declare Activity in this way:

public class MainActivity extends AppCompatActivity implements OnFragmentInteractionListener {

    .....
    .....
}

and then implement their methods.

Usually the interface is declared in Fragment and is used to communicate with Activity, hence the requirement to implement it.

Some examples of using this approach:

• Make two different classes communicate
• Placing event click on the button that is in a Fragment, in an Activity?
• When you have a reference in Fragment through getActivity() I should use interface?