Question

Hy，我是android的新手，我正在尝试在片段中构建ListView。我有一个主类MainActivity extends FragmentActivity implements ActionBar.TabListener和一些内部类。我使用public class PopulatePageAdapter extends FragmentPagerAdapter来返回我需要的片段，以及一个代表我片段的类：

public class usersList extends Fragment {
    private List<User> usersList = new ArrayList<User>();

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

        ArrayAdapter<User> adapter = new MyListAdapter();
        ListView list = (ListView)rootView.findViewById(R.id.listView);
        Log.d("Q","QQ");
        list.setAdapter(adapter);//here my app fails
        Log.d("Q","WW");
        return rootView;
    }

这是我的ArrayAdapter

private class MyListAdapter extends ArrayAdapter<User> {
        public MyListAdapter() {
            super(getActivity().getApplicationContext(), R.layout.contact_layout, usersList);
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            View userView = convertView;
            if (userView == null) {
                userView = MainMenuActivity.this.getLayoutInflater().inflate(R.layout.contact_layout, parent, false);
            }

            User user = usersList.get(position);
            ImageView imageView = (ImageView) userView.findViewById(R.id.icon);
            imageView.setImageResource(user.getProfilePictureId());

            TextView textView = (TextView) userView.findViewById(R.id.textViewCompleteName);
            textView.setText(user.getFirstName() + " " + user.getLastName());
            return userView;
        }
    }

我在想我没有正确使用ArrayAdapter，但我没有看到任何其他方式使用它。

Answer 1

看起来您不会将数据（userList）解析为适配器。也许看看这个：http://www.vogella.com/tutorials/AndroidListView/article.html

您必须将数据附加到适配器并解析您的上下文：

ArrayList<User> usersList;
Context mContext;
public MyListAdapter(Context context, ArrayList<User> myListViewData) {
    this.mContext = context;
    this.usersList = myListViewData;
}

Answer 2

您需要将数据传递到适配器

ArrayList<Data> data=new ArrayList<Data>();
data= getArguments().getParcelableArrayList("data");
 adapter = new DataAdapter(getActivity(),data);
 listView.setAdapter(adapter);

ArrayAdapter片段失败

2 个答案: