Android | AdMob Interstitial Ads for Android Studio

Interstitial ads are full-screen ads that cover the whole UI of the app. This article shows you how to integrate Interstitial ads from AdMob into an Android app.

Example –

First Create a new Project in Android Studio and add the following codes to import the google Mobile Ads SDK. In the project-level build.gradle file, add the highlighted code to the allprojects section.

allprojects 
{ 
    repositories 
    { 
        google() 
            jcenter() 
                maven 
        { 
            url "https://maven.google.com"
        } 
    } 
} 

In the app-level build.gradle file, add the highlighted code to dependencies section.

dependencies 
{ 
implementation fileTree (dir : 'libs', include : [ '*.jar' ]) 
implementation 'com.android.support:appcompat-v7:26.1.0' 
compile 'com.google.android.gms:play-services-ads:15.0.0'

Add the following code to Main Activity to initialize Mobile Ads SDK (this only needs to be done once in app lifecycle). You can find the the app’s App ID in AdMob console.

package org.geeksforgeeks.geeksforgeeks; 
  
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import com.google.android.gms.ads.MobileAds; 
  
public class MainActivity extends AppCompatActivity  
{ 
    protected void onCreate (Bundle savedInstanceState) 
    { 
        super.onCreate (savedInstanceState); 
        setContentView (R.layout.activity_main); 
  
        // Initialize the Mobile Ads SDK 
        MobileAds.initialize (this, getString (R.string.admob_app_id)); 
    } 
} 

Add the highlighted code to Main Activity to show Interstitial Ad:

MainActivity.class –

package org.geeksforgeeks.geeksforgeeks; 
  
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import com.google.android.gms.ads.MobileAds; 
import com.google.android.gms.ads.AdListener; 
import com.google.android.gms.ads.AdRequest; 
import com.google.android.gms.ads.InterstitialAd; 
  
public class MainActivity extends AppCompatActivity  
{ 
    private InterstitialAd interstitial; 
  
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
  
        // Initialize the Mobile Ads SDK 
        MobileAds.initialize(this, getString(R.string.admob_app_id)); 
        AdRequest adIRequest = new AdRequest.Builder().build(); 
  
        // Prepare the Interstitial Ad Activity 
        interstitial = new InterstitialAd(MainActivity.this); 
  
        // Insert the Ad Unit ID 
        interstitial.setAdUnitId(getString(R.string.admob_interstitial_id)); 
  
        // Interstitial Ad load Request 
        interstitial.loadAd(adIRequest); 
  
        // Prepare an Interstitial Ad Listener 
        interstitial.setAdListener(new AdListener()  
{ 
            public void onAdLoaded() 
            { 
                // Call displayInterstitial() function when the Ad loads 
                displayInterstitial(); 
            } 
        }); 
    } 
  
    public void displayInterstitial() 
    { 
        // If Interstitial Ads are loaded then show else show nothing. 
        if (interstitial.isLoaded()) { 
            interstitial.show(); 
        } 
    } 
} 

Add the Admob App Id and Interstitial Ad Id to string.xml

strings.xml –

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <string name="admob_app_id"> 
        ca-app-pub-3940256099942544~3347511713</string> 
    <string name="admob_interstitial_id"> 
        ca-app-pub-3940256099942544/1033173712</string> 
    <!-- ca-app-pub-3940256099942544~3347511713  
                          this is your admob app id -->
    <!-- ca-app-pub-3940256099942544/1033173712  
              this is your admob Interstitial ad id -->
</resources> 

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