Android碎片类怎么添加通话功能？

Question

/**
 * A simple {@link Fragment} subclass.
 * Activities that contain this fragment must implement the
 * {@link ussd.OnFragmentInteractionListener} interface
 * to handle interaction events.
 * Use the {@link ussd#newInstance} factory method to
 * create an instance of this fragment.
 */
public class ussd 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 ListView listView;
    private ussdadaper ussd;
    private List<ussdz> ussdlist;

    private OnFragmentInteractionListener mListener;

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

    /**
     * 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 ussd.
     */
    // TODO: Rename and change types and number of parameters
    public static ussd newInstance(String param1, String param2) {
        ussd fragment = new ussd();
        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 rootView = inflater.inflate(R.layout.fragment_ussd, container, false);

        listView = (ListView)rootView.findViewById(R.id.listView);
        ussdlist = new ArrayList<>();
        ussdlist.add(new ussdz(1,"*#44336#","Software Version Info"));

        listView.setOnItemClickListener(
                new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                        String item = (String)listView.getItemAtPosition(position);
                        if(position == 0){

                        Intent callIntent = new Intent(Intent.ACTION_CALL);
                        callIntent.setData(Uri.parse("*#44336#"));
                        callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(callIntent);
                    }}
                }
        );


        ussd = new ussdadaper(getActivity(),ussdlist);
        listView .setAdapter(ussd);   //you should setthe adapter to the listview
        return rootView;
    }  

    // TODO: Rename method, update argument and hook method into UI event
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }

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


    public interface OnFragmentInteractionListener {
        public void onFragmentInteractionHome(Uri uri);
        public void openHome(View view);
    }
    }

    /**
     * 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.
     */

错误日志：

所以如果我在呼叫活动中做错了什么，那么请帮助我。编译器没有显示错误。

Answer 1

您的异常发生在此行：

String item = (String)listView.getItemAtPosition(position);

您正在尝试将不是字符串的内容转换为字符串。读取错误日志时显示：

ClassCastException：com.buckydroid.app.droidcpu.ussdz不能强制转换为java.lang.String

ussdz item = listView.getItemAtPosition(position);