android - 小部件中的ListView不会更新

我想从服务中更新小部件中的ListView。为此，我在服务中包含以下代码：

Intent intent = new Intent(ctx, ListProvider.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));

remoteViews.setRemoteAdapter(widgetId, R.id.listViewWidget, intent);
appWidgetManager.updateAppWidget(widgetId, remoteViews);

我确定该服务正在运行并且代码已执行，但是在主屏幕上的小部件中没有任何反应。我的ListProvider看起来像这样：

public class ListProvider implements RemoteViewsFactory
{
    public ListProvider(Context context, Intent intent)
    {
        Log.d("ME",  "new ListProvider");

        this.context = context;
        appWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);

        populateListItem();
    }

    private void populateListItem()
    {
        for (int i = 0; i < 10; i++)
        {
            ListItem listItem = new ListItem();
            listItem.heading = "Heading" + i;
            listItem.content = i + " This is the content";
            listItemList.add(listItem);
        }
    }

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

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

    @Override
    public RemoteViews getViewAt(int position)
    {
        final RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.list_row);
        ListItem listItem = listItemList.get(position);

        remoteView.setTextViewText(R.id.heading, listItem.heading);
        remoteView.setTextViewText(R.id.content, listItem.content);

        return remoteView;
    }

    @Override
    public RemoteViews getLoadingView()
    {
        return null;
    }

    @Override
    public int getViewTypeCount()
    {
        return 1;
    }

    @Override
    public boolean hasStableIds()
    {
        return true;
    }

    // Some other override methods

    public class ListItem
    {
        public String heading,content;
    }
}

这是我的AppWidgetProvider：

public class MyWidgetProvider extends AppWidgetProvider
{
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
    {
        super.onUpdate(context, appWidgetManager, appWidgetIds);
    }
}

但我认为从来没有叫过ListProvider。不会显示日志消息，并且在主屏幕上没有任何反应。有什么想法吗？

最佳答案

使用服务来更新远程适配器：

public class UpdateWidgetService extends RemoteViewsService {
    @Override
    public RemoteViewsFactory onGetViewFactory(Intent intent) {
        return new ListProvider(this.getApplicationContext(), intent);
    }
}

并直接使用服务类而不是RemoteViewFactory：

for (int i = 0; i < appWidgetIds.length; ++i) {
    RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);

    Intent serviceIntent = new Intent(context, UpdateWidgetService.class);
    serviceIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[i]);
    serviceIntent.setData(Uri.parse(serviceIntent.toUri(Intent.URI_INTENT_SCHEME)));
    remoteViews.setRemoteAdapter(appWidgetIds[i], R.id.stackWidgetView, serviceIntent);
    remoteViews.setEmptyView(R.id.stackWidgetView, R.id.no_data_imageview);
    appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
}

从未在listView中对其进行测试。