仅在扫描appl中的Activity中未在Fragment中调用onActivityResult

Question

我是Android新手。我的扫描应用程序无法在片段中调用onActivityResult。我确实检查了其他线程，但无法理解这个问题。

public class BarCodeFrag 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;

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment SearchCatFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static BarCodeFrag newInstance(String param1, String param2) {
        BarCodeFrag fragment = new BarCodeFrag();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

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

//    @Override
//    public void startActivityForResult(Intent intent, int code) {
//        BarCodeFrag.startActivityForResult(intent, code);
//    }

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

    //the custom view
    private SearchView myView;
    private Button scanBtn;
    private TextView formatTxt, contentTxt;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView =  inflater.inflate(R.layout.fragment_barcode, container, false);

        //get reference to the custom view
//        myView = (SearchView) rootView.findViewById(R.id.androidATCView1);

        scanBtn = (Button) rootView.findViewById(R.id.scan_button);
        formatTxt = (TextView) rootView.findViewById(R.id.scan_format);
        contentTxt = (TextView) rootView.findViewById(R.id.scan_content);

        scanBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(v.getId()==R.id.scan_button){
                    //instantiate ZXing integration class
                    IntentIntegrator scanIntegrator = new IntentIntegrator(getActivity());
                    //start scanning
                    scanIntegrator.initiateScan();
                   // startActivityForResult(scanIntegrator, 1888);

                }
                else{
                    //invalid scan data or scan canceled
                    Toast toast = Toast.makeText(getActivity().getApplicationContext(),
                            "No scan data received!", Toast.LENGTH_SHORT);
                    toast.show();
                }
            }
        });
        return rootView;
    }

    // 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(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentInteractionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

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

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p/>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        public void onFragmentInteraction(Uri uri);
    }

    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        //retrieve result of scanning - instantiate ZXing object
        super.onActivityResult(requestCode,  resultCode,  intent);
        IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
        //check we have a valid result

        Toast.makeText(getActivity().getApplicationContext(), "Inside onActivityResult" , Toast.LENGTH_LONG).show();

        if (scanningResult != null) {
            //get content from Intent Result
            String scanContent = scanningResult.getContents();
            //get format name of data scanned
            String scanFormat = scanningResult.getFormatName();
            //output to UI
            formatTxt.setText("FORMAT: " + scanFormat);
            contentTxt.setText("CONTENT: " + scanContent);

            Toast.makeText(getActivity().getApplicationContext(), "Reply: " + scanFormat + ":" + scanContent, Toast.LENGTH_LONG).show();

            CheckAvailability(scanFormat);
        }}

我打算从扫描中看到格式和内容。这个appl正在运行一个单独的appl，但是当我在片段中添加代码以添加到我的其他应用程序时 - 我无法看到格式和内容。欢迎任何建议。非常感谢。