onAttach(Activity) deprecated: where I can check if the activity implements callback interface

Question

Before API 23 I used Fragment\'s onAttach methods to get my listener instance, then the reference is cleaned inside onDetach. ex:

@Override
public void onAtt         


        

Answer 1

 public class MainActivity extends AppCompatActivity implements  topsection.TopSectionListener {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
 }



 public void createMeme(String top, String bottom){
    bottomsection fragmentbottom = (bottomsection) getSupportFragmentManager().findFragmentById(R.id.fragment2);
    fragmentbottom.setMemeText(top, bottom);
  }
 }