android - ListView 不使用 ArrayAdapter 在 fragment 中显示数据

Question

我创建了一个 fragment ，我想在其中显示 ListView ，但我的 fragment 在没有 ListView 的情况下显示，也没有出现错误

我已经阅读了很多关于这个问题的解决方案，但我找不到合适的解决方案。一点帮助就太好了。谢谢!

public class ServicesFragment extends Fragment {
    public TextView servicesName;
    ListView listView;
    String[] servicesNameArray;
    int[] serviceImages = {
            R.drawable.ic_menu_camera,
            R.drawable.ic_menu_camera,
            R.drawable.ic_menu_camera,
            R.drawable.ic_menu_camera,
            R.drawable.ic_menu_camera,
            R.drawable.ic_menu_camera,
            R.drawable.ic_menu_camera,
            R.drawable.ic_menu_camera
    };
     public ServicesFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view= inflater.inflate(R.layout.services_fragment, container, false);
        listView = (ListView) view.findViewById(R.id.listView_services);
        ServicesAdapter adapter = new ServicesAdapter(getContext(), servicesNameArray, serviceImages);
        listView.setAdapter(adapter);
        Resources resources = getResources();
        resources.getStringArray(R.array.servicesName);
        return view;
    }

  public class ServicesAdapter extends ArrayAdapter<String> {

 Context c;
        int[] servicesImageArray;
        String[] servicesNameArray;
        public ServicesAdapter(Context context, String[] servicesNameArray, int[] serviceImages) {
            super(context, R.layout.services_layout, R.id.listView_services);
            this.c = context;
            this.servicesImageArray = serviceImages;
            this.servicesNameArray = servicesNameArray;
        }

        @NonNull
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View view = inflater.inflate(R.layout.services_layout, parent, false);
            ImageView serviceImages = (ImageView) view.findViewById(R.id.image_of_services);
            TextView servicesName = (TextView) view.findViewById(R.id.name_of_services);
            serviceImages.setImageResource(servicesImageArray[position]);
            servicesName.setText(servicesNameArray[position]);
            return view;}}}

Answer 1

你没有给字符串数组赋值:使用

servicesNameArray = getResources().getStringArray(R.array.servicesName);  

而不是:

 ServicesAdapter adapter = new ServicesAdapter(getContext(), servicesNameArray, serviceImages);

使用 Activity 上下文:

ServicesAdapter adapter = new ServicesAdapter(this.getActivity(), servicesNameArray, serviceImages);

您需要通知适配器您的数据集大小:

super(context, R.layout.services_layout, servicesNameArray); //change here