Question

这是我的片段页面，我正在尝试创建列表视图

    public class MessagesFragment extends Fragment {
     ArrayList<String> brands= new ArrayList<String>();

    //String[] brands = {"Android","IPhone","WindowsMobile","Blackberry","WebOS","Ubuntu","Windows7","Max OS X"};
    public MessagesFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_messages, container, false);


        brands.add("microsoft");
        brands.add("ios" );
        brands.add("android");
        AdapterListView adapter = new AdapterListView(brands,getActivity());

        ListView listView = (ListView)rootView.findViewById(R.id.mobile_list);
        listView.setAdapter(adapter);
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_messages, container, false);
    }
}

这是我的适配器类

    public class AdapterListView extends BaseAdapter {
    Context context;
    ArrayList<String> brands;

    public AdapterListView(ArrayList<String> brands, Context context) {
        this.brands = brands;
        this.context = context;
    }

    @Override
    public int getCount() {
        return brands.size();
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {

        view= LayoutInflater.from(context).inflate(R.layout.activity_listview,null);
        ListView lv=(ListView)view.findViewById(R.id.mobile_list);
         lv.getAdapter();

        return view;
    }
}

我需要设置列表品牌..目前我没有获得列表品牌的任何价值。我认为错误是适配器类的最后一部分

Answer 1

你应该您return rootView;

的onCreateView方法中的MessagesFragment

而不是

 return inflater.inflate(R.layout.fragment_messages, container, false);

Answer 2

正如@Rustam在答案中所说，你需要从那里返回rootView。我认为你的适配器类的getview()应该有更多的变化为..

@Override
public View getView(int i, View view, ViewGroup viewGroup) {

    view= LayoutInflater.from(context).inflate(R.layout.activity_listview,null);
 // layout.activity_listview should be your custom row layout with textview
 // find the TextView of your custom row and set data on it,,
    TextView tv = (TextView) view.findViewById(R.id.yourTextview);
    tv.setText(brands.get(i));

    return view;
}

我正在使用listview，我在适配器类有一个错误

2 个答案: