从一个片段移动到一个新的活动

Question

我已经完成了导航，现在进入第一个片段。在第一个片段中有两个按钮，我需要通过按下这些按钮来切换到一个新的活动。我不明白如何正确地实施它。我犯了一个错误。

代码，eror

public class Fragment1 extends Fragment {



    @Nullable
    @Override
    public View onCreateView
            (@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        ViewGroup rootView=null;


        rootView=(ViewGroup) inflater.inflate(R.layout.fragment1, container, false);
        return rootView;

        Button button=(Button) rootView.findViewById(R.id.btn1);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent=new Intent(getActivity(), One.class);
                startActivity(intent);
            }


        });
    }
}

Answer 1

放置返回rootView

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    ViewGroup rootView = inflater.inflate(R.layout.fragment1, container, false);

    Button button=(Button) rootView.findViewById(R.id.btn1);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent(getActivity(), One.class);
            startActivity(intent);
        }
    });

    return rootView;
}