AdMob AdView in Jetpack Compose

AdMob.kt

import android.view.ViewGroup
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.defaultMinSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.LocalInspectionMode
import androidx.compose.ui.platform.LocalLifecycleOwner
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.compose.ui.viewinterop.AndroidView
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleEventObserver
import com.google.android.gms.ads.AdRequest
import com.google.android.gms.ads.AdSize
import com.google.android.gms.ads.AdView

private const val ADMOB_TEST_AD_UNIT_ID = "ca-app-pub-3940256099942544/2247696110"

@Composable
fun AdMobBannerAd(
    modifier: Modifier = Modifier,
    adSize: AdSize = AdSize.BANNER,
    adUnitId: String = ADMOB_TEST_AD_UNIT_ID,
) {
    val minSizeModifier = when (adSize) {
        AdSize.BANNER -> Modifier.defaultMinSize(minWidth = 320.dp, minHeight = 50.dp)
        AdSize.LARGE_BANNER -> Modifier.defaultMinSize(minWidth = 320.dp, minHeight = 100.dp)
        AdSize.MEDIUM_RECTANGLE -> Modifier.defaultMinSize(minWidth = 300.dp, minHeight = 250.dp)
        AdSize.FULL_BANNER -> Modifier.defaultMinSize(minWidth = 468.dp, minHeight = 60.dp)
        AdSize.LEADERBOARD -> Modifier.defaultMinSize(minWidth = 728.dp, minHeight = 90.dp)
        else -> Modifier
    }

    if (LocalInspectionMode.current) {
        Box(
            modifier = modifier
                .then(minSizeModifier)
                .background(Color.LightGray)
                .padding(16.dp)
        ) {
            Text(
                modifier = Modifier.align(Alignment.Center),
                text = "AdMob Banner Ad",
                fontSize = 14.sp,
                color = Color.DarkGray,
            )
        }
    } else {
        val adView = rememberAdViewWithLifecycle(adSize, adUnitId)
        AndroidView(
            modifier = modifier.then(minSizeModifier),
            factory = { adView },
        )

    }
}

@Composable
fun rememberAdViewWithLifecycle(
    adSize: AdSize,
    adUnitId: String,
    adRequest: AdRequest = AdRequest.Builder().build(),
): AdView {
    val context = LocalContext.current
    val adView = AdView(context).apply {
        layoutParams = ViewGroup.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT,
        )
        this.adSize = adSize
        this.adUnitId = adUnitId
        loadAd(adRequest)
    }

    val lifecycle = LocalLifecycleOwner.current.lifecycle
    DisposableEffect(lifecycle, adView) {
        val lifecycleObserver = getAdLifecycleObserver(adView)
        lifecycle.addObserver(lifecycleObserver)
        onDispose {
            lifecycle.removeObserver(lifecycleObserver)
            adView.destroy()
        }
    }

    return adView
}

private fun getAdLifecycleObserver(adView: AdView): LifecycleEventObserver =
    LifecycleEventObserver { _, event ->
        when (event) {
            Lifecycle.Event.ON_RESUME -> adView.resume()
            Lifecycle.Event.ON_PAUSE -> adView.pause()
            Lifecycle.Event.ON_DESTROY -> adView.destroy()
            else -> {}
        }
    }

@Preview
@Composable
fun AdMobBannerAdPreview() {
    AdMobBannerAd()
}

hey champ use setAdSize(adSize) as we cannot initialize val variables with new data