try {
      MoPub.init('ad_unit_id', testMode: true).then((_) {
        _loadRewardedAd();
        _loadInterstitialAd();
      });
    } on PlatformException {}

void _loadRewardedAd() {
   videoAd = MoPubRewardedVideoAd('ad_unit_id',
       (result, args) {
     setState(() {
       rewardedResult = '${result.toString()}____$args';
     });
     print('$result');
     if (result == RewardedVideoAdResult.GRANT_REWARD) {
       print('Grant reward: $args');
     }
   }, reloadOnClosed: true);
 }

 void _loadInterstitialAd() {
  interstitialAd = MoPubInterstitialAd(
    'ad_unit_id',
    (result, args) {
      print('Interstitial $result');
    },
    reloadOnClosed: true,
  );    
}

 MoPubBannerAd(
            adUnitId: 'ad_unit_id',
            bannerSize: BannerSize.STANDARD,
            keepAlive: true,
            listener: (result, dynamic) {
              print('$result');
            },
          );

# Keep public classes and methods.
-keepclassmembers class com.mopub.** { public *; }
-keep public class com.mopub.**
-keep public class android.webkit.JavascriptInterface {}

# Explicitly keep any BaseAd and CustomEventNative classes in any package.
-keep class * extends com.mopub.mobileads.BaseAd {}
-keep class * extends com.mopub.nativeads.CustomEventNative {}

# Keep methods that are accessed via reflection
-keepclassmembers class ** { @com.mopub.common.util.ReflectionTarget *; }

-keep class com.google.android.gms.common.GooglePlayServicesUtil {*;}
-keep class com.google.android.gms.ads.identifier.AdvertisingIdClient {*;}
-keep class com.google.android.gms.ads.identifier.AdvertisingIdClient$Info {*;}

-keep class * extends java.util.ListResourceBundle {
    protected Object[][] getContents();
}

-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
    public static final *** NULL;
}

-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
    @com.google.android.gms.common.annotation.KeepName *;
}

-keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
}