Install the Admob Android SDKDownload the Android Admob SDK, extract it and copy GoogleAdMobAdsSdk-*.*.*.jar to the PhoneGap project’s libs directory.

project’s libs directory

Select the Project ‘File’ -> ‘Project Structure’ from the  Modules .
Now select  Source Tab  select the ‘+ Add Content Root’ Button and by opening windows Select Your  GoogleAdMobAdsSdk-*.*.*.jar file
Select yourProject/libs/GoogleAdMobAdsSdk-*.*.*.jar

yourProject/libs/GoogleAdMobAdsSdk

Include Admob’s Library

 Add the following lines in your MainActivity.java right below other imports.

import com.google.ads.*;
import android.widget.LinearLayout;
 

 Here, the first import contains the functions related to ads while the second one will help us in inserting the ads into the screen.

Configure your AdMob ad unit ID

Now, inside the main class of your MainActivity.java file, create a new private string AdMob_Ad_Unit like this:

 
private static final String AdMob_Ad_Unit = "xxxxxxxxxxxxxxx";

Make sure to replace xxxxxxxxxxxxxxx with your own ID as putting incorrect ID there will result in no ads showing up.

Create the Ad View

private AdView adView;

 
adView = new AdView(this, AdSize.BANNER, AdMob_Ad_Unit); 
LinearLayout layout = super.root; 
layout.addView(adView); 
AdRequest request = new AdRequest();

adView.loadAd(request); 

request.addTestDevice(AdRequest.TEST_EMULATOR);
 

package com.project.android;
 
import android.os.Bundle; 
import org.apache.cordova.*;
import com.google.ads.*;
import android.widget.LinearLayout;
 
public class MainActivity extends DroidGap
{
    private static final String AdMob_Ad_Unit = "xxxxxxxxxxxxxxx";
    private AdView adView;
 
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
         
        super.onCreate(savedInstanceState);
        // Set by in config.xml
        super.loadUrl(Config.getStartUrl());
        //super.loadUrl("file:///android_asset/www/index.html")
         
        adView = new AdView(this, AdSize.BANNER, AdMob_Ad_Unit); 
        LinearLayout layout = super.root; 
        layout.addView(adView); 
        AdRequest request = new AdRequest();
         
        // Comment this out before publishing.
        // request.addTestDevice(AdRequest.TEST_EMULATOR);
        adView.loadAd(request); 
  
    }
}

 
 android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"/>