Flutter, Facebook Audience Network ads banner not showing when enter another screen - flutter

Question

I use this plugin
facebook_audience_network 0.5.0
and I implemented this by this way
class FacebookAd{
static void faceInit() {
FacebookAudienceNetwork.init(
testingId: "xxxxxxx-xxxxx-xxxx-xxxx-xxxxxxxxxx",
);
}
static widget myBanner;
static void showBannerAd() {
myBanner = FacebookBannerAd(
placementId: "xxxxxxxxx_xxxxxxxxxxx",
keepAlive: true,
bannerSize: BannerSize.STANDARD,
listener: (result, value) {
print("Banner Ad: $result --> $value eee");
switch (result) {
case BannerAdResult.ERROR:
print("Error: $value");
break;
case BannerAdResult.LOADED:
print("Loaded: $value");
break;
case BannerAdResult.CLICKED:
print("Clicked: $value");
break;
case BannerAdResult.LOGGING_IMPRESSION:
print("Logging Impression: $value");
break;
}
},
);
}
}
}
and from other classes
return Scaffold(
bottomNavigationBar: FacebookAd.myBanner
)
so in the app, all of screens refer variable "myBanner" to show banner inside "bottomNavigationBar"
but the problem is when the screen is changed using pushNamed("/xxx")
sometimes the screen showing banner and sometimes not ! (mostly not)
how do I solve this problem this?
thank you

Answer 1

Here is how I was able to solve the FAN interstitials for different pages, unlike the AdMob you should manage the Facebook FAN ads centrally in a separate dart class.
class MyFacebookAdsManager {
static bool isInterstitialAdLoaded = false;
static String adsInterstitialUnitId = '';
static void init(String id) {
logger.i('$prefix init called');
adsInterstitialUnitId = id;
FacebookAudienceNetwork.init(
testingId: '<test-id-if-needed>',
);
loadNewFANInterstitialAd();
}
static void loadNewFANInterstitialAd() {
FacebookInterstitialAd.loadInterstitialAd(
placementId: adsInterstitialUnitId,
listener: (result, value) {
logger.i("$prefix >> FAN > Interstitial Ad: $result --> $value");
switch (result) {
case InterstitialAdResult.LOADED:
isInterstitialAdLoaded = true;
break;
case InterstitialAdResult.DISMISSED:
isInterstitialAdLoaded = false;
loadNewFANInterstitialAd();
break;
case InterstitialAdResult.ERROR:
isInterstitialAdLoaded = false;
logger.e('error loading facebook ads');
loadNewFANInterstitialAd();
break;
default:
}
},
);
}
static void showInterstitialAd() {
if (isInterstitialAdLoaded)
FacebookInterstitialAd.showInterstitialAd();
else
loadNewFANInterstitialAd();
}
}
Now in the main screen you will call the init once and only once.
MyFacebookAdsManager.init('test-id')
Finally, wherever you want to display the Ad, use the class created and show the ad.
MyFacebookAdsManager.showInterstitialAd();
In the same fashion, you should create separate classes and manage All banners & reward videos.