ListView in widget does not update

问题:

I want to update a ListView in a widget from a service. For this I have this code in my service:

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);

I'm sure that the service is running and the code is executed but in the widget on the homescreen nothing happens. My ListProvider looks like this:

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;
    }
}

And this is my AppWidgetProvider:

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

But the ListProvider is never called I think. The Log message is not displayed and on the homescreen nothing happens. Any ideas why?

回答1:

Use a service to update the remote adapter:

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

And use the service class instead of the RemoteViewFactory directly:

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);
}

Never tested it in a listView.