christmas_cats/lib/screens/shop.dart

import 'package:firebase_admob/firebase_admob.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:sprintf/sprintf.dart';

import '../localizations.dart';
import '../storage.dart';
import '../widgets/menu.dart';
import '../widgets/menu_entry.dart';

class ShopScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final localizations = ChristmasCatsLocalizations.of(context);

    return Scaffold(
      resizeToAvoidBottomInset: false,
      body: StreamBuilder(
        stream: storage.coins,
        builder: (context, snapshot) => Menu(
          title: localizations.shop,
          subtitle: sprintf(localizations.coins, [snapshot?.data ?? 0]),
          children: <Widget>[
            MenuEntry(
              text: localizations.getCoins,
              onTap: () {
                final scaffold = Scaffold.of(context);
                scaffold.showSnackBar(SnackBar(
                  content: Text(localizations.adLoading),
                  // Show it until the ad is loaded
                  duration: Duration(minutes: 1),
                ));

                final ad = RewardedVideoAd.instance;
                ad.listener = (event, {rewardAmount, rewardType}) {
                  scaffold.removeCurrentSnackBar();
                  if (event == RewardedVideoAdEvent.loaded) {
                    ad.show();
                  } else if (event == RewardedVideoAdEvent.failedToLoad) {
                    scaffold.showSnackBar(SnackBar(
                      content: Text(localizations.noAds),
                      duration: const Duration(seconds: 2),
                    ));
                  } else if (event == RewardedVideoAdEvent.rewarded) {
                    storage.addCoins(rewardAmount);
                  }
                };

                ad.load(
                  adUnitId: kReleaseMode
                      ? 'ca-app-pub-4129701777413448/6712208196'
                      : 'ca-app-pub-3940256099942544/5224354917',
                  targetingInfo: MobileAdTargetingInfo(),
                );
              },
            ),
          ],
          showBackButton: true,
        ),
      ),
    );
  }
}