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If you are not interested to use AdMob Ad in your WebView Android App, then alternative solution is AdSense. Prerequisites are 


  • Google Mobile Ads SDK version 20.6.0 or higher.
  • Android API level 21 or higher.


First Step: build.gradle

Add dependencies in app/build.gradle


dependencies {
    implementation 'androidx.browser:browser:1.8.0'
    implementation 'com.google.android.gms:play-services-ads:23.3.0
}


Note: You should use latest version for both. When you read this article the version 23.3.0 version may become old.



Second Step: AndroidManifest.xml

Add the following <meta-data>  between <application> tag in your AndroidManifest.xml file


<meta-data
    android:name="com.google.android.gms.ads.INTEGRATION_MANAGER"
    android:value="webview"/>

 

 

Third Step : MainActivity.java

onCreate(Bundle) is where you initialize your activity. Here add these activities


    CookieManager.getInstance().setAcceptThirdPartyCookies(webView, true);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setDomStorageEnabled(true);
    webView.getSettings().setMediaPlaybackRequiresUserGesture(false);
    MobileAds.registerWebView(webView);

 

After sync, import

import android.webkit.CookieManager;
import com.google.android.gms.ads.MobileAds; 



Final Step : Live Demonstration

Create APK file and see if the Ad appears or not.