Question

我正在尝试以MainActivity方式在我的布局中以编程方式添加片段，以便在其onCreate方法中更具体。我一直收到错误Cannot resolve method add()，这真的不应该发生，因为我从官方网站复制了代码。有人请帮忙。这是代码：

FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        FooterVertical fragment = new FooterVertical();
        fragmentTransaction.add(R.id.activity_main, fragment);
        fragmentTransaction.commit();

public class FooterVertical extends Fragment {
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    private OnFragmentInteractionListener mListener;

    public FooterVertical() {
        // Required empty public constructor
    }

    public static FooterVertical newInstance(String param1, String param2) {
        FooterVertical fragment = new FooterVertical();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_footer_vertical, container, false);
        return v;
    }

    // TODO: Rename method, update argument and hook method into UI event
    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

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


    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

Answer 1

如果您要导入android.app.Fragment;，请将其更改为android.support.v4.app.Fragment;

Answer 2

我用这个：

FragmentManager fm = getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame, new HomeFragment()).commit();

android以编程方式添加片段不接受参数

2 个答案: