public class IngredientsWidgetConfigureActivity extends Activity implements RecipesAdapter.RecipesAdapterOnClickHandler {


int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
RecipesAdapter mAdapter;


public IngredientsWidgetConfigureActivity(){
    super();
}

//save recipeId into SharedPrefs
static void saveSelectedRecipe (Context context, int appWidgetId, int selectedRecipe){
    SharedPreferences.Editor prefs = context.getSharedPreferences(AppConstants.PREFS_NAME, 0).edit();
    prefs.putInt(AppConstants.PREF_PREFIX_KEY + appWidgetId, selectedRecipe);
    prefs.apply();
}


@Override
protected void onCreate(@Nullable Bundle icicle) {
    super.onCreate(icicle);

    setResult(RESULT_CANCELED);

    setContentView(R.layout.ingredients_widget_configure);

    //setup RecyclerView
    ...

    Intent intent = getIntent();
    Bundle extras = intent.getExtras();

    if (extras != null){
        mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
    }
    if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID){
        finish();
        return;
    }

}

@Override
public void onClick(Recipe recipe) {
    final Context context = IngredientsWidgetConfigureActivity.this;

    // When the button is clicked, store the recipe Id
    int selectedRecipe = recipe.id;
    saveSelectedRecipe(context, mAppWidgetId, selectedRecipe);

    // It is the responsibility of the configuration activity to update the app widget
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    IngredientsWidget.updateAppWidget(context, appWidgetManager, mAppWidgetId);

    // Make sure we pass back the original appWidgetId
    Intent resultValue = new Intent();
    resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
    setResult(RESULT_OK, resultValue);
    finish();
}

....
static void updateAppWidget(final Context context, AppWidgetManager appWidgetManager,
                     int appWidgetId) {

    RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.ingredients_widget_layout);

    Intent intent = new Intent(context, WidgetRemoteViewsService.class);
    intent.putExtra(AppConstants.APP_WIDGET_ID_KEY, appWidgetId);
    views.setRemoteAdapter(R.id.widget_list_view, intent);


    //TODO: recipes are not changing in different widgets

    // Instruct the widget manager to update the widget
    appWidgetManager.updateAppWidget(appWidgetId, views);
}


@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {

    // There may be multiple widgets active, so update all of them
    for (int appWidgetId : appWidgetIds) {

        updateAppWidget(context, appWidgetManager, appWidgetId);


    }

}

public WidgetRemoteViewsFactory (Context context, Intent intent){
    mContext = context;
    appWidgetId = intent.getIntExtra(AppConstants.APP_WIDGET_ID_KEY, 1);
}

@Override
public void onCreate() {

}

@Override
public void onDataSetChanged() {

    final long identityToken = Binder.clearCallingIdentity();

//get id from SharedPref
    RecipeDatabase mDb = RecipeDatabase.getInstance(mContext);
    SharedPreferences prefs = mContext.getSharedPreferences(AppConstants.PREFS_NAME, 0);
    recipeId = prefs.getInt(AppConstants.PREF_PREFIX_KEY + appWidgetId, 9999);


    recipe = mDb.recipeDAO().loadRecipe(recipeId);


    Binder.restoreCallingIdentity(identityToken);


}

@Override
public void onDestroy() {

}

@Override
public int getCount() {
    if (recipe == null) {
        return 0;
    } else {
        return recipe.ingredients.size();
    }
}

@Override
public RemoteViews getViewAt(int position) {
    if (position > recipe.ingredients.size()){
        return null;
    }


    RemoteViews remoteViews = new RemoteViews(mContext.getPackageName(), R.layout.widget_list_item);
    remoteViews.setTextViewText(R.id.widget_text, recipe.ingredients.get(position).getIngredient());

    return remoteViews;
}

@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;
}