RewardedAd – Jetpack Compose

import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.wrapContentHeight
import androidx.compose.foundation.layout.wrapContentWidth
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import com.google.android.gms.ads.AdError
import com.google.android.gms.ads.AdRequest
import com.google.android.gms.ads.FullScreenContentCallback
import com.google.android.gms.ads.LoadAdError
import com.google.android.gms.ads.MobileAds
import com.google.android.gms.ads.rewarded.RewardedAd
import com.google.android.gms.ads.rewarded.RewardedAdLoadCallback
import com.neco_desarrollo.videorewardcompose.ui.theme.VideoRewardComposeTheme

const val AD_ID = "ca-app-pub-3940256099942544/5224354917"
class MainActivity : ComponentActivity() {
    private var rewardedAd: RewardedAd? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        MobileAds.initialize(this)
        loadAd()
        setContent {
            VideoRewardComposeTheme {
                Box(
                    modifier = Modifier
                        .fillMaxSize()
                        .wrapContentHeight(align = Alignment.Bottom)
                        .wrapContentWidth(align = Alignment.CenterHorizontally)
                ){
                    Button(onClick = {
                        rewardedAd?.show(this@MainActivity){ item ->
                            Toast.makeText(
                                this@MainActivity,
                                "Reward: ${item.amount}",
                                Toast.LENGTH_SHORT
                            ).show()
                        }
                    }) {
                        Text(text = "Show Ad")
                    }
                }
            }
        }
    }

    private fun loadAd(){
        val adRequest = AdRequest.Builder().build()
        RewardedAd.load(this, AD_ID, adRequest, object : RewardedAdLoadCallback(){
            override fun onAdFailedToLoad(p0: LoadAdError) {
                super.onAdFailedToLoad(p0)
            }

            override fun onAdLoaded(ad: RewardedAd) {
                super.onAdLoaded(ad)
                rewardedAd = ad
                rewardedAd?.fullScreenContentCallback = adListener()
            }
        })
    }

    private fun adListener() = object : FullScreenContentCallback(){
        override fun onAdDismissedFullScreenContent() {
            super.onAdDismissedFullScreenContent()
            rewardedAd = null
            loadAd()
        }

        override fun onAdFailedToShowFullScreenContent(p0: AdError) {
            super.onAdFailedToShowFullScreenContent(p0)
            rewardedAd = null
            loadAd()
        }
    }
}