From my Fragment I send:
public void sendToWidget(Subreddit subreddit) {
        Context context = getActivity();
        currentSubreddit = subreddit;

        if (context != null) {
            SharedPreferences prefs = context.getSharedPreferences("widget_prefs", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = prefs.edit();
            editor.putString("name", currentSubreddit.getName());
            editor.commit();
            Log.d(TAG, "sendToWidget: " + subreddit.getName());
        }
    }
//-----------------------------------------------------

Here's my Service:
   @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        RemoteViews views = getPrefs(this);
        ComponentName theWidget = new ComponentName(this, TrendyWidgetProvider.class);
        AppWidgetManager manager = AppWidgetManager.getInstance(this);
        manager.updateAppWidget(theWidget, views);
        Log.d(TAG, "onStartCommand: " + mSubreddit.getName());
        return super.onStartCommand(intent, flags, startId);
    }

   private RemoteViews getPrefs(Context context) {
        mSubreddit = new Subreddit();
//        context = getApplicationContext();
            SharedPreferences prefs = context.getSharedPreferences("widget_prefs", Context.MODE_PRIVATE);
            String imgUrl = prefs.getString("icon", mSubreddit.getIconUrl());
            String name = prefs.getString("title", mSubreddit.getName());
            String lastUpdate = "Last subreddit added: " + "\n" + name;
            RemoteViews views = new RemoteViews(getPackageName(), R.layout.trendy_widget);
            views.setTextViewText(R.id.trendy_title, lastUpdate);

        Log.d(TAG, "dataReceived: " + name);
        return views;
    }

And here's my WidgetProvider

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

        // Construct the RemoteViews object
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.trendy_widget);
        AppWidgetTarget target = new AppWidgetTarget(context,80, 80, R.id.trendy_img, views, appWidgetId);
        views.setTextViewText(R.id.trendy_title, Integer.toString(mCounter));
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }

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

        for (int appWidgetId : appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId);
        }
        context.startService(new Intent(context, UpdateIntentService.class));

        Intent intent = new Intent(context, SearchActivity.class);

        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

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

        views.setOnClickPendingIntent(R.id.widget_container, pendingIntent);

        appWidgetManager.updateAppWidget(appWidgetIds, views);
    }