AdMob Banner Ad in Android (Kotlin) by Rekibur Uddin

1. Add AdMob App ID in AndroidManifest.xml:

<application  

    <meta-data
        android:name="com.google.android.gms.ads.APPLICATION_ID"
        android:value="@string/admob_AppId"/>

</application>

2. Add dependencies in build.gradle (Module):

implementation("com.google.android.gms:play-services-ads:24.4.0")







3. Initialize Mobile Ads in MainActivity

MobileAds.initialize(this)







Simple Banner Ads:

3.1: Add in XML Layout

<!-- res/layout/activity_main.xml -->

<!-- Admob Banner Ads -->
<com.google.android.gms.ads.AdView
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:id="@+id/adView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_alignParentBottom="true"
    ads:adSize="BANNER"
    ads:adUnitId="@string/admob_BannerAdId"/>




3.2: Add Kt Code Inside onCreate

// Inside onCreate
val adRequest = AdRequest.Builder().build()
binding.adView.loadAd(adRequest)







Adaptive Banner Ads:

4.1: Layout XML with Container

<!-- res/layout/activity_main.xml -->
<LinearLayout
    android:id="@+id/adContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:gravity="center_horizontal" />




4.2 : Kotlin Code 




// Top of onCreate
private lateinit var adContainer: LinearLayout
private var adView: AdView? = null




// Load Adaptive Banner (Inside onCreate)
loadAdaptiveBanner()




private fun loadAdaptiveBanner() {
    adView = AdView(this)

    val adUnitId = getString(R.string.banner_ad_unit_id)

    adView?.adUnitId = adUnitId // Replace with real Ad Unit ID "-"

    adContainer.removeAllViews()
    adContainer.addView(adView)

    val adSize = getAdSize()
    adView?.setAdSize(adSize)

    val adRequest = AdRequest.Builder().build()
    adView?.loadAd(adRequest)
}

private fun getAdSize(): AdSize {
    val display = windowManager.defaultDisplay
    val outMetrics = DisplayMetrics()
    display.getMetrics(outMetrics)

    val density = outMetrics.density
    val adWidthPixels = adContainer.width.takeIf { it > 0 } ?: outMetrics.widthPixels
    val adWidth = (adWidthPixels / density).toInt()

    return AdSize.getCurrentOrientationAnchoredAdaptiveBannerAdSize(this, adWidth)
}

override fun onPause() {
    adView?.pause()
    super.onPause()
}

override fun onResume() {
    super.onResume()
    adView?.resume()
}

override fun onDestroy() {
    adView?.destroy()
    super.onDestroy()
}







Test Id:

<resources>

    <string name="admob_app_id">ca-app-pub-3940256099942544~3347511713</string>
    <string name="banner_ad_unit_id">ca-app-pub-3940256099942544/6300978111</string>

</resources>