不显示数据列表的小部件

我有一个小部件,它应该显示一个信息列表。然而,在研究了大量教程和文档之后,我无法理解为什么它没有显示列表。它将始终显示空视图。从未调用过widgetservice.java类。

我的代码可以在Github上找到 here :

RecipeWidgetProvider.java

public class RecipeWidgetProvider extends AppWidgetProvider {

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    for (int appWidgetId : appWidgetIds) {
        updateAppWidget(context, appWidgetManager, appWidgetId);
    }
    super.onUpdate(context, appWidgetManager, appWidgetIds);
}

static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                            int appWidgetId) {
    SharedPreferences preferences = context.getSharedPreferences(context.getPackageName(), Context.MODE_PRIVATE);
    long recipeId = preferences.getLong(WidgetConfigurationActivity.PREF_PREFIX_KEY+appWidgetId, 0);
    Intent serviceIntent = new Intent(context, WidgetService.class);
    serviceIntent.putExtra(WidgetService.EXTRA_RECIPE_ID, recipeId);
    serviceIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    serviceIntent.setData(Uri.parse(serviceIntent.toUri(Intent.URI_INTENT_SCHEME)));
    Intent intent = new Intent(context, RecipeListActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);


    RemoteViews widget = new RemoteViews(context.getPackageName(), R.layout.widget_recipes);
    widget.setRemoteAdapter(appWidgetId, R.id.widget_configuration_list_view, serviceIntent);
    widget.setEmptyView(R.id.widget_recipe_list_view, R.id.empty_view);
    widget.setOnClickPendingIntent(R.id.widget_container, pendingIntent);

    //appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetId, R.id.widget_recipe_list_view);
    appWidgetManager.updateAppWidget(appWidgetId, widget);
}
}

小部件服务.java

public class WidgetService extends RemoteViewsService {
    public static String EXTRA_RECIPE_ID = "recipeId";

    @Override
    public RemoteViewsFactory onGetViewFactory(Intent intent) {
        int recipeId = intent.getIntExtra(EXTRA_RECIPE_ID, -1);
        return new WidgetViewFactory(getApplicationContext(), recipeId);
    }
}

小部件视图工厂.java

public class WidgetViewFactory implements RemoteViewsService.RemoteViewsFactory {
    private Context context;
    private long recipeId;
    private ArrayList<IngredientEntity> ingredients = new ArrayList<>();

    public WidgetViewFactory(Context context, long recipeId) {
        this.context = context;
        this.recipeId = recipeId;
        RecipeLocalSource source = RecipeLocalSource.getInstance(context);
        RecipeEntity recipe = source.getRecipe(recipeId);
        if (recipe != null) {
            ingredients.addAll(recipe.getIngredients());
        }
    }

    @Override
    public void onCreate() {
        Log.e("","");
    }

    @Override
    public void onDataSetChanged() {
        RecipeLocalSource source = RecipeLocalSource.getInstance(context);
        RecipeEntity recipe = source.getRecipe(recipeId);
        if (recipe != null) {
            ingredients.addAll(recipe.getIngredients());
        }
    }

    @Override
    public void onDestroy() {
        Log.e("","");
    }

    @Override
    public int getCount() {
        Log.d("","");
        return ingredients.size();
    }

    @Override
    public RemoteViews getViewAt(int position) {
        final IngredientEntity ingredient = ingredients.get(position);
        RemoteViews row = new RemoteViews(context.getPackageName(),
                R.layout.item_widget_ingredient);

        row.setTextViewText(R.id.item_widget_ingredient_name, ingredient.getIngredient());
        row.setTextViewText(R.id.item_widget_ingredient_quantity_measure, String.format("%s %s", ingredient.getQuantity(), ingredient.getMeasure()));
        return row;
    }

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

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

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

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