Set a title in Toolbar from fragment in Android

Question

I have been using the latest Toolbar from AppCompatv7 lib.I have placed a textview in the ToolBar ViewGroup And I want to set a title into this Textview from the fragment in my

Answer 1

You can create Interface inside the Fragment. check below:-

public class MyFragment extends Fragment {
    OnMyFragmentListener mListener;

    // Where is this method called??
    public void setOnMyFragmentListener(OnMyFragmentListener listener) {
        this.mListener = listener;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnMyFragmentListener) {
            mListener = (OnMyFragmentListener) context;
            mListener.onChangeToolbarTitle("My Fragment"); // Call this in `onResume()`
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    @Override
    public void onResume(){
        super.onResume();
        mListener.onChangeToolbarTitle("My Fragment");
    }


    // This interface can be implemented by the Activity, parent Fragment,
    // or a separate test implementation.
    public interface OnMyFragmentListener {
        public void onChangeToolbarTitle(String title);
    }

}

In Activity:-

public class MyActivity extends AppCompatActivity implements MyFragment.OnMyFragmentListener {

    @Override
    public void onChangeToolbarTitle(String title){
        toolbar.setTitle(title);
    }

}

This works for me. :)