Kotlin] 안드로이드 앱 실행 시 전면 광고 넣기

https://stackoverflow.com/questions/24125022/want-to-show-admob-interstitial-on-app-start

want to show admob interstitial on app start

https://developers.google.com/admob/android/interstitial

전면 광고  |  Android  |  Google Developers

private lateinit var mInterstitialAd: InterstitialAd

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mInterstitialAd = InterstitialAd(this)
        mInterstitialAd.adUnitId = "ca-app-pub-3940256099942544/1033173712"
        mInterstitialAd.loadAd(AdRequest.Builder().build())

        mInterstitialAd.adListener = object : AdListener() {
            override fun onAdLoaded() {
                if (mInterstitialAd.isLoaded) {
                    mInterstitialAd.show()
                }else {
                    Log.d("Msg ", "The interstitial wasn't loaded yet.")
                }
            }

            override fun onAdOpened() {
            }
            override fun onAdFailedToLoad(errorCode: Int) {
            }
        }
}