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Question

对于我的SherlockListFragment，我有以下代码，

public class RoutesListFragment extends SherlockListFragment {

    private ArrayList<Route> mItems;
    private static final String TAG = "ROUTES LIST";

    RoutesAdapter mAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstaceState) {

        View view = inflater.inflate(R.layout.fragment_main_lists, container,
                false);

            // When the setListAdapter is called here,
            // it works without any problems

        return view;
    }

    public void updateAdapter() {
        // populate the list
        mItems = Route.getRouteList();
        Log.d(TAG, "Size of mItems : " + mItems.size());
        mAdapter = new RoutesAdapter(getActivity(), R.layout.list_item_routes,
                mItems);

        this.setListAdapter(mAdapter);

    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        Log.d(TAG, "Clicked item " + position);
    }

    private class RoutesAdapter extends ArrayAdapter<Route> {

        private ArrayList<Route> mItems;
        private Context mContext;
        int mTextViewResource;

        public RoutesAdapter(Context context, int textViewResource,
                ArrayList<Route> items) {
            super(context, textViewResource);

            this.mItems = items;
            this.mContext = context;
            this.mTextViewResource = textViewResource;
        }

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

            if (view == null) {
                LayoutInflater inflater = (LayoutInflater) mContext
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = inflater.inflate(mTextViewResource, null);
            }

            Route route = mItems.get(position);

            ((TextView) view.findViewById(R.id.route_name)).setText(route
                    .getRouteName());
            ((TextView) view.findViewById(R.id.route_number)).setText(Integer
                    .toString(route.getRouteNumber()));
            ((TextView) view.findViewById(R.id.direction)).setText(route
                    .getDirection().toString());
            ((TextView) view.findViewById(R.id.start_end)).setText(route
                    .getStartingStop() + " - " + route.getEndingStop());

            return view;
        }

    }
}

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我已检查以确保ArrayList<Route> mItems不为空。
从updateAdapter()的{{1}}函数调用onPostExecute函数。
此AsyncTask用于SherlockListFragment标签。
它适用于ViewPagerIndicator onCreateView``函数。

Answer 1

您只需更改适配器中的数组，然后调用

即可

adapter.notifyDataSetChanged（）;

而不是创建新的适配器

Answer 2

我必须补充jiduvah的答案。

显然ArrayAdapter拥有项目ArrayList<Route>的副本。因此。我必须在致电mAdapter.addAll(Route.getRouteList())之前致电mAdapter.notifyAll()。

现在updateAdapter函数的代码是。

public void updateAdapter() {
    mAdapter.addAll(Route.getRouteList());
    mAdapter.notifyDataSetChanged();
}

<强>参考

listview not updating with notifydatasetchanged() call

调用setListAdapter时，SherlockListFragment不会更新

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2 个答案: