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

To allow a Fragment to communicate up to its Activity (to set your Toolbar Title), you can define an interface in the Fragment class and implement it within the Activity as described here: Communicating with Other Fragments.

Answer 2

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. :)

Answer 3

If you have setSupportActionBar in Your Activity then you can easily change the toolbar title from your fragment

((YourActivity) getActivity()).getSupportActionBar().setTitle("Your Title");

Answer 4

I do this like this: from the fragment call

getActivity().setTitle("your title");

Also you can call any function of your parent Activity like this:

YourActivity mYourActiviy = (YourActivity) getActivity();
mYourActivity.yourActivityFunction(yourParameters);

Answer 5

In your Activity declare the toolbar as public.

public class YourActivity : Activity
{
    public Toolbar toolbar;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = .... // initilize your toolbar
    }
}

Then, from your fragment

((YourActivity) getActivity()).toolbar.Title = "Your Title";

Answer 6

You need to set the title in activity commiting the fragment and return the fragment

getSupportFragmentManager().beginTransaction().replace(R.id.main_fragment, mainFragment).commit();
            toolbar.setTitle("ShivShambhu");
            return contentFragment;

This works for me.