Is there any AdMob dummy id?

Question

Is there any AdMob dummy ids for testing purpose? Do I need to register app & get MY_AD_UNIT_ID?

Answer 1

Banner:

ca-app-pub-3940256099942544/6300978111

Interstitial:

ca-app-pub-3940256099942544/1033173712

Rewarded Video:

ca-app-pub-3940256099942544/5224354917

Native Advanced:

ca-app-pub-3940256099942544/2247696110

Native Advanced Video:

ca-app-pub-3940256099942544/1044960115

Native Express Small/Large:

ca-app-pub-3940256099942544/2793859312 
ca-app-pub-3940256099942544/2177258514

source

Answer 2

For RewardedVideo you can use the following one :

private static final String AD_UNIT_ID = "ca-app-pub-3940256099942544/5224354917";
private static final String APP_ID = "ca-app-pub-3940256099942544~3347511713";

how to use:

MobileAds.initialize(this, APP_ID);

mRewardedVideoAd = MobileAds.getRewardedVideoAdInstance(this);
mRewardedVideoAd.setRewardedVideoAdListener(this);
mRewardedVideoAd.loadAd(AD_UNIT_ID, new AdRequest.Builder().build());

for showing

 if (mRewardedVideoAd.isLoaded()) {
        mRewardedVideoAd.show();
  }

Hope this will help many of us!