在fragment里使用toolbar及menu

https://www.cnblogs.com/mengdd/p/5590634.html

修改toolbar的title

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.news_fragment,container,false);
        setHasOptionsMenu(true);
        androidx.appcompat.widget.Toolbar toolbar = (Toolbar) view.findViewById(R.id.toolbar);
        ((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
        ((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("近期新闻");
        return view;
    }