Android AdMob Skill

AdMob integration patterns: banner ads, interstitials, rewarded ads.

When to Use

• Setting up AdMob SDK
• Implementing banner ads
• Adding interstitial ads
• Integrating rewarded ads
• Testing with test ad units

Setup

Dependencies

[libraries]
play-services-ads = { module = "com.google.android.gms:play-services-ads", version = "24.3.0" }

Initialization

// In Application class
MobileAds.initialize(this) { initializationStatus ->
    Timber.d("AdMob initialized: $initializationStatus")
}

AndroidManifest.xml

<meta-data
    android:name="com.google.android.gms.ads.APPLICATION_ID"
    android:value="ca-app-pub-XXXXXXXXXXXXXXXX~YYYYYYYYYY"/>

Banner Ads

@Composable
fun BannerAd(modifier: Modifier = Modifier) {
    AndroidView(
        modifier = modifier.fillMaxWidth(),
        factory = { context ->
            AdView(context).apply {
                setAdSize(AdSize.BANNER)
                adUnitId = if (BuildConfig.DEBUG) {
                    "ca-app-pub-3940256099942544/6300978111" // Test ID
                } else {
                    BuildConfig.ADMOB_BANNER_ID
                }
                loadAd(AdRequest.Builder().build())
            }
        }
    )
}

// Adaptive banner (recommended)
@Composable
fun AdaptiveBannerAd(modifier: Modifier = Modifier) {
    val context = LocalContext.current
    val windowMetrics = remember {
        WindowMetricsCalculator.getOrCreate().computeCurrentWindowMetrics(context as Activity)
    }
    val adWidth = (windowMetrics.bounds.width() / context.resources.displayMetrics.density).toInt()

    AndroidView(
        modifier = modifier.fillMaxWidth(),
        factory = { ctx ->
            AdView(ctx).apply {
                setAdSize(AdSize.getCurrentOrientationAnchoredAdaptiveBannerAdSize(ctx, adWidth))
                adUnitId = BuildConfig.ADMOB_BANNER_ID
                loadAd(AdRequest.Builder().build())
            }
        }
    )
}

Interstitial Ads

class InterstitialAdManager(private val context: Context) {
    private var interstitialAd: InterstitialAd? = null

    fun loadAd() {
        val adRequest = AdRequest.Builder().build()
        val adUnitId = if (BuildConfig.DEBUG) {
            "ca-app-pub-3940256099942544/1033173712"
        } else {
            BuildConfig.ADMOB_INTERSTITIAL_ID
        }

        InterstitialAd.load(context, adUnitId, adRequest) { ad, error ->
            if (error != null) {
                Timber.e("Interstitial failed to load: ${error.message}")
                return@load
            }
            interstitialAd = ad
        }
    }

    fun showAd(activity: Activity, onDismissed: () -> Unit) {
        interstitialAd?.apply {
            fullScreenContentCallback = object : FullScreenContentCallback() {
                override fun onAdDismissedFullScreenContent() {
                    interstitialAd = null
                    onDismissed()
                    loadAd() // Preload next
                }
                override fun onAdFailedToShowFullScreenContent(error: AdError) {
                    interstitialAd = null
                    onDismissed()
                }
            }
            show(activity)
        } ?: onDismissed()
    }

    fun isLoaded(): Boolean = interstitialAd != null
}

Rewarded Ads

class RewardedAdManager(private val context: Context) {
    private var rewardedAd: RewardedAd? = null

    fun loadAd() {
        val adRequest = AdRequest.Builder().build()
        val adUnitId = if (BuildConfig.DEBUG) {
            "ca-app-pub-3940256099942544/5224354917"
        } else {
            BuildConfig.ADMOB_REWARDED_ID
        }

        RewardedAd.load(context, adUnitId, adRequest) { ad, error ->
            if (error != null) {
                Timber.e("Rewarded ad failed to load: ${error.message}")
                return@load
            }
            rewardedAd = ad
        }
    }

    fun showAd(activity: Activity, onRewarded: (RewardItem) -> Unit, onDismissed: () -> Unit) {
        rewardedAd?.apply {
            fullScreenContentCallback = object : FullScreenContentCallback() {
                override fun onAdDismissedFullScreenContent() {
                    rewardedAd = null
                    onDismissed()
                    loadAd() // Preload next
                }
            }
            show(activity) { reward ->
                onRewarded(reward)
            }
        } ?: onDismissed()
    }

    fun isLoaded(): Boolean = rewardedAd != null
}

Test Ad Units (Use in Debug)

Type	Test ID
App Open	ca-app-pub-3940256099942544/9257395921
Banner	ca-app-pub-3940256099942544/6300978111
Interstitial	ca-app-pub-3940256099942544/1033173712
Interstitial Video	ca-app-pub-3940256099942544/8691691433
Rewarded	ca-app-pub-3940256099942544/5224354917
Rewarded Interstitial	ca-app-pub-3940256099942544/5354046379
Native	ca-app-pub-3940256099942544/2247696110

Version Compatibility

Play Services Ads	Min SDK	Target SDK
24.x	21	35
23.x	21	34
22.x	19	33

Error Handling

// Ad load error handling
InterstitialAd.load(context, adUnitId, adRequest) { ad, error ->
    if (error != null) {
        when (error.code) {
            AdRequest.ERROR_CODE_NETWORK_ERROR ->
                Timber.w("Network unavailable for ads")
            AdRequest.ERROR_CODE_NO_FILL ->
                Timber.d("No ad inventory available")
            AdRequest.ERROR_CODE_INTERNAL_ERROR ->
                Timber.e("AdMob internal error")
            else -> Timber.w("Ad error: ${error.message}")
        }
        return@load
    }
    interstitialAd = ad
}

// Show ad with fallback
fun showAdOrContinue(activity: Activity, onComplete: () -> Unit) {
    if (interstitialAd != null) {
        interstitialAd?.show(activity)
    } else {
        Timber.d("Ad not ready, continuing without ad")
        onComplete()
    }
}

Troubleshooting

Issue	Solution
No fill	Normal - try again later, use mediation
Test ads only	Check ad unit ID, device registration
Clicks not counting	Verify no overlapping views
Policy violation	Review ad placement, content

Security Checklist

• Test IDs in BuildConfig.DEBUG
• Production IDs in BuildConfig.RELEASE
• No hardcoded ad unit IDs
• Consent management (GDPR/CCPA)
• App-ads.txt configured

Best Practices

• Always use test IDs in debug builds
• Preload ads before showing
• Handle ad not available gracefully
• Don't show ads too frequently
• Follow AdMob policies strictly
• Implement proper error handling
• Consider user experience first

AdMob Policies Checklist

• No accidental clicks (proper spacing)
• No incentivizing clicks
• No misleading ad placement
• Proper ad labeling
• No pop-ups or full-screen ads without user action
• Content policy compliance

References

• AdMob Quick Start
• AdMob Policies
• Test Ads
• Mediation

Use this skill for ethical, effective monetization.