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to learn more about app and game monetization,
visit the official sites
of AdMob
and ad manager.
<topic_end>
<topic_start>
9. complete example
the following code implements a simple stateful widget that loads a
banner ad and shows it.
<code_start>
import 'dart:io';
import 'package:flutter/widgets.dart';
import 'package:google_mobile_ads/google_mobile_ads.dart';
class MyBannerAdWidget extends StatefulWidget {
/// the requested size of the banner. defaults to [adsize.banner].
final AdSize adSize;
/// the AdMob ad unit to show.
///
/// TODO: replace this test ad unit with your own ad unit
final string adUnitId = Platform.isAndroid
// use this ad unit on android...
? 'ca-app-pub-3940256099942544/6300978111'
// ... or this one on iOS.
: 'ca-app-pub-3940256099942544/2934735716';
MyBannerAdWidget({
super.key,
this.adSize = AdSize.banner,
});
@override
State<MyBannerAdWidget> createState() => _MyBannerAdWidgetState();
}
class _MyBannerAdWidgetState extends State<MyBannerAdWidget> {
/// the banner ad to show. this is `null` until the ad is actually loaded.
BannerAd? _bannerAd;
@override
widget build(BuildContext context) {
return SafeArea(
child: SizedBox(
width: widget.adSize.width.toDouble(),
height: widget.adSize.height.toDouble(),
child: _bannerAd == null
// nothing to render yet.
? SizedBox()
// the actual ad.
: AdWidget(ad: _bannerAd!),
),
);
}
@override
void initState() {
super.initState();
_loadAd();
}
@override
void dispose() {
_bannerAd?.dispose();
super.dispose();
}
/// loads a banner ad.
void _loadAd() {
final bannerAd = BannerAd(
size: widget.adSize,
adUnitId: widget.adUnitId,
request: const AdRequest(),
listener: BannerAdListener(
// called when an ad is successfully received.
onAdLoaded: (ad) {
if (!mounted) {
ad.dispose();
return;
}
setState(() {
_bannerAd = ad as BannerAd;
});
},
// called when an ad request failed.
onAdFailedToLoad: (ad, error) {
debugPrint('BannerAd failed to load: $error');
ad.dispose();
},
),
);
// start loading.
bannerAd.load();
}
}
<code_end>
lightbulb tip
in many cases, you will want to load the ad outside a widget.
for example, you can load it in a ChangeNotifier, a BLoC, a controller,
or whatever else you are using for app-level state. this way, you can
preload a banner ad in advance, and have it ready to show for when the
user navigates to a new screen.
verify that you have loaded the BannerAd instance before showing it with
an AdWidget, and that you dispose of the instance when it is no longer
needed.
<topic_end>
<topic_start>
add multiplayer support using firestore
multiplayer games need a way to synchronize game states between players.