Question

我尝试在片段中显示listView。但方法setListAdapter - 未解析。我想，我必须得到listView（android.R.id.list）的id; 然后：lv.setAdapter（mAdapter）;但它也不起作用。

public class MyEmployeeFragment extends Fragment {

    private CustomAdapter sAdapter;
    private List<User> userList;
    ProgressDialog mProgressDialog;



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

        setHasOptionsMenu(true);
        userList = new ArrayList<User>();
        sAdapter = new CustomAdapter(getActivity(),userList);
        setListAdapter(sAdapter);
        new CustomAsync().execute();

    }

    private class CustomAdapter extends ArrayAdapter<User> {
        private LayoutInflater inflater;

        public CustomAdapter(Context context, List<User> objects) {
            super(context, 0, objects);
            inflater = LayoutInflater.from(context);
        }

        class ViewHolder {
            TextView id;
            TextView name;
            TextView lastName;
        }


        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            ViewHolder vH;
            if (convertView == null) {
                convertView = inflater.inflate(R.layout.list_item_employee, null);
                vH = new ViewHolder();
                vH.id = (TextView) convertView.findViewById(R.id.tv_employee_id);
                vH.name = (TextView) convertView.findViewById(R.id.tv_employee_name);
                vH.lastName = (TextView) convertView.findViewById(R.id.tv_employee_last_name);
                convertView.setTag(vH);
            } else
                vH = (ViewHolder) convertView.getTag();


            final User user = getItem(position);
            vH.id.setText(user.getId());
            vH.name.setText(user.getName());
            vH.lastName.setText(user.getLastName());


            return convertView;
        }
    }

    private class CustomAsync extends AsyncTask<Void,Void,List<User>>
    {}
}

XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:divider="#B7B7B7"

        />

    <ProgressBar
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/progressBar2"
        android:layout_gravity="center_vertical"
        android:layout_weight="1"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <TextView
        android:id="@id/android:empty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="@string/empty"
        android:layout_above="@+id/progressBar2"
        android:layout_alignRight="@+id/progressBar2"
        android:layout_alignEnd="@+id/progressBar2"
        android:layout_marginBottom="83dp">
    </TextView>

</RelativeLayout>

Answer 1

当您的片段扩展setListAdapter时，

ListFragment是Fragment的一种方法。

http://developer.android.com/reference/android/app/ListFragment.html#setListAdapter(android.widget.ListAdapter)

所以你要么扩展ListFragment

或

使用Fragment扩展ListView对布局进行曝光，在ListView的{{1}}中初始化onCreateView，然后使用Fragment。

如果您想扩展Fragment

listView.setAdapter(adapter)

然后

 <ListView
    android:id="@+id/list"

Answer 2

setListAdapter()是ListFragment中的一种方法。为此，您需要扩展ListFragmnet而不是Fragment。

更改此行

public class MyEmployeeFragment extends Fragment

到

public class MyEmployeeFragment extends ListFragment

Answer 3

您需要先定义ListView：

ListView list = (ListView) findById(android.R.id.list);

以后你需要放适配器：

list.setAdapter(sAdapter);

或更改

extends Fragment

到

extends ListFragment

Answer 4

extends ListFragment应该工作正常。

下面是一个对我有用的示例。

public class Chicks extends ListFragment implements OnItemClickListener  {

}

无法解析方法setListAdapter

4 个答案: