showAdIfAvailable method
Shows the rewarded ad if it is available.
Does nothing if the ad is not available or already being shown.
Implementation
void showAdIfAvailable(String requestId) {
if (!isAdAvailable) {
_logger.debug('Tried to show ad before it was available.');
return;
}
_rewardedAd!.show(onUserEarnedReward: (ad, reward) {
handleUserEarnedReward(requestId, ad, reward);
});
}