java - 创建 ListView 后出现“取消选中调用”警告

Question

出于某种原因，在创建我的 ListView 后 new ArrayAdapter(getActivity(), R.layout.list_item, R.id.list_item, listContent) 以黄色突出显示并出现警告。有谁知道需要做什么才能解决此警告？

Unchecked call to 'ArrayAdapter(Context, int, int, T[])' as a member of raw type 'android.widget.ArrayAdapter'

public class FragmentMainList extends android.support.v4.app.Fragment {

    public FragmentMainList() {
    }

    ListView list_main;


    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View v = inflater.inflate(R.layout.fragment_main_list, container, false);

        String[] listContent = {
                getActivity().getResources().getString(R.string.item_1),
                getActivity().getResources().getString(R.string.item_2),
                getActivity().getResources().getString(R.string.item_3)
        };

        list_main = (ListView)v.findViewById(R.id.list_main);
        ArrayAdapter adapter = new ArrayAdapter(getActivity(), R.layout.list_item, R.id.list_item, listContent);
        list_main.setAdapter(adapter);

        return v;
    }
}

Answer 1

你的 ArrayAdapter是原始类型，因为它是模板化的，但您尚未指定类型。

解决问题:

ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), R.layout.list_item, R.id.list_item, listContent);