Adnroid - Activity and Fragment communication using inteface

activity_with_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="@dimen/fab_margin"
        app:backgroundTint="@color/colorBlack"
        app:srcCompat="@drawable/plus" />

</android.support.design.widget.CoordinatorLayout>

MyActivity.java

public class MyActivity extends implements MyFragment.MyFragmentListener {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
      setContentView(R.layout.activity_with_fragment);

      MyFragment myFragment = new MyFragment();

      FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
      fragmentTransaction.replace(R.id.fragment_container, myFragment);
      fragmentTransaction.commit();

      FloatingActionButton floatOptionButton = findViewById(R.id.fab_add);
      floatOptionButton.setOnClickListener(v -> myFragment.someMethod());
  }
  ...
    
  @Override
  public void onFragmentButtonClicked() {
    // stuff - when fragment respond
  }
}

MyFragment.java

public class MyFragment extends Fragment {
  
  public MyFragment(){ }
  
  public static Fragment newInstance() {
      return new MyFragment();
  }
  
  // Interface 
  private MyFragmentListener mCallback;
  public interface MyFragmentListener {
      void onFragmentButtonClicked();
  }
  
  @Override
  public void onAttach(Context activity) {
      super.onAttach(activity);

      // This makes sure that the container activity has implemented
      // the callback interface. If not, it throws an exception
      try {
          mCallback = (MyFragmentListener) activity;
      } catch (ClassCastException e) {
          e.printStackTrace();
      }
  }
  
  @Override
  public void onDetach() {
      super.onDetach();
      mCallback = null;
  }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, @Nullable Bundle savedInstanceState) {
      return inflater.inflate(R.layout.fragment_layout, container, false);
  }

  @Override
  public void onActivityCreated(@Nullable Bundle savedInstanceState) {
      super.onActivityCreated(savedInstanceState);
    
      someButton.setOnClickListener(view -> {
          mCallback.onFragmentButtonClicked();
      });
  }
  
  public void someMethod() {
      // stuff - it can be called from activity
  }
}