Question

我的片段中有listview，我想在我的onclick事件中从listview中获取项目。但我得到错误，表明我宣布我的名单为最终。当我尝试将我的列表声明为final。我得到另一个错误“不兼容......”。

这是我的代码

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.announcement_fragment, container, false);
    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }
    ArrayList<Announcement> listAnnouncement = GetlistAnnouncement();
    ListView lv = (ListView)rootView.findViewById(R.id.list_announcement);
    lv.setAdapter(new AnnouncementAdapter(listAnnouncement, getActivity()));
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            Announcement item =  lv.getItemAtPosition(i);
        }
    });
    return rootView;
}

我在这一行收到错误

Announcement item =  lv.getItemAtPosition(i);

答案： 变化

Announcement item =  lv.getItemAtPosition(i);

到

Announcement item =  listAnnouncement.get(i);

或

Announcement item =  (Announcement)adapterView.getItemAtPosition(i);

Answer 1

但我得到的错误表明我宣布我的名单为最终

你的lv需要是最终的，因为它在一个匿名的内部类中使用。

Cannot refer to a non-final variable inside an inner class defined in a different method

我收到另一个错误“不兼容......”。

无需使用lv或进行最终决定。改变这个

Announcement item =  lv.getItemAtPosition(i);

到

Announcement item =  (Announcement)adapterView.getItemAtPosition(i);

getItemAtPosition返回一个需要强制转换的对象

文档：

public Object getItemAtPosition (int position)

Added in API level 1
Gets the data associated with the specified position in the list.

Parameters
position    Which data to get
Returns
The data associated with the specified position in the list

从Fragment中的Listview获取项目

1 个答案: