Android Integrate Interstitial Ads Google AdMob in App

Interstitial Ads is a full screen ad format cover UI of app. It's display overlay the app until user close. The best practise used at natural pauses in the flow of an app's execution.

Google provided a mobile ad network called AdMob to display ads in applications, so we can generate income from our Android App. To earn the revenue by integrating Google AdMob ads in android applications, we need to follow below steps.

• Sign Up Admob Account
• Choose ad format and Create ad Unit
• Integrate Ads SDK into app
• Publish App into Playstore

This today article, I will show how to integrated interstitial ad or full screen ad very quick and easy to understand for your real project.

Design Simple Layout

We will add a button to perform click and show the full screen ad after ad is loaded.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Show"
        android:id="@+id/btn"/>
</RelativeLayout>

Initiailize Ad in Java Class

Interstital Ad is different from banner ad. You don't have to add Adview in layout xml file where you want to display. We only implement in Java file because the overlay full screen ad is ready prepared by Google.

Note: Make all calls to the Mobile Ads SDK on the main thread.

Open main activity java file MainActivity.java in app -> java -> package(com.cambotutorial.sovary.adtest) -> MainActivity.java write the code as shown below.

package com.cambotutorial.sovary.adtest

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.interstitial.InterstitialAd;
import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback;

public class MainActivity extends AppCompatActivity {

    private final String TAG = "MainActivity";
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
       // Call initialize only one time
        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });
    }
}

Load Interstitial Ad Object

Once we initialized Mobile Ad Sdk, we are begining implement interstitial full screen ad by write the code like as shown below

AdRequest adRequest = new AdRequest.Builder().build();
InterstitialAd.load(this, getString(R.string.AdFullScreen), adRequest,
new InterstitialAdLoadCallback() {
    @Override
    public void onAdLoaded(@NonNull InterstitialAd interstitialAd) {
        // The mInterstitialAd reference will be null until
        // an ad is loaded.
        mInterstitialAd = interstitialAd;
    }

    @Override
    public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
        // Handle the error
        Log.i(TAG, loadAdError.getMessage());
        // Reset object interstitial
        mInterstitialAd = null;
    }
});

Set Callback Listener

Before showing InterstitialAd, make sure to set the callback FullScreenContentCallback which is handles events related to displaying your InterstitialAd . Make sure you check incase mInterstitialAd is null first. We will start callback when click the button.

// Find button by id in xml layout file
Button btn = findViewById(R.id.btn);
// Perform click to show ad with call back listener
btn.setOnClickListener(v->
{
    if(mInterstitial !=null)
    {
        mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback(){
        @Override
        public void onAdDismissedFullScreenContent() {
            // Called when fullscreen content is dismissed (closed).
            Log.d(TAG, "The ad was dismissed.");
        }
        @Override
        public void onAdFailedToShowFullScreenContent(AdError adError) {
            // Called when fullscreen content failed to show.
            Log.d(TAG, "The ad failed to show.");
        }
        @Override
        public void onAdShowedFullScreenContent() {
            // Called when fullscreen content is shown.
            // Make sure to set your reference to null so you don't
            // show it a second time.
            mInterstitialAd = null;
            Log.d(TAG, "The ad was shown.");
        }
        });
    }
});

Overrided methods: 

• onAdDismissedFullScreenContent() - Called when user closed the full screen ad content.
• onAdFailedToShowFullScreenContent(AdError adError) - Called when the ad failed to show full screen content.
• onAdShowedFullScreenContent() - Called when the ad showed the full screen content overlay on activity or fragment.

Ready to Display Ad

Once we have done above, to show an interstitial we use the show() method.

if (mInterstitialAd != null)
{
  mInterstitialAd.show(MainActivity.this);
}
else
{
  Log.d(TAG, "The interstitial ad wasn't ready yet.");
}

Full Snippet Code

Check this below snippet make sure you don't miss any syntax. If your app not work make sure you read this Integrate Android Google AdMob SDK Tutorial at first place. 

package com.cambotutorial.sovary.adtest

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.google.android.gms.ads.interstitial.InterstitialAd;
import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback;

public class MainActivity extends Activity {

    private InterstitialAd mInterstitialAd;
    private final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Call initialize only one time
        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {}
        });
        AdRequest adRequest = new AdRequest.Builder().build();

        InterstitialAd.load(this, getString(R.string.AdFullScreen), adRequest,
            new InterstitialAdLoadCallback() {
                @Override
                public void onAdLoaded(@NonNull InterstitialAd interstitialAd) {
                    // The mInterstitialAd reference will be null until
                    // an ad is loaded.
                    mInterstitialAd = interstitialAd;
                    Log.i(TAG, "onAdLoaded");
                }

                @Override
                public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
                    // Handle the error
                    Log.i(TAG, loadAdError.getMessage());
                    mInterstitialAd = null;
                }
            });

        // Find button by id in xml layout file
        Button btn = findViewById(R.id.btn);
        // Perform click to show ad with call back listener
        btn.setOnClickListener(v->
        {
            if(mInterstitialAd !=null)
            {
                mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback()
                {
                    @Override
                    public void onAdClicked()
                    {
                        super.onAdClicked();
                    }

                    @Override
                    public void onAdDismissedFullScreenContent()
                    {
                        // Called when fullscreen content is dismissed (closed).
                        Log.d(TAG,"The Ad was dismissed");
                    }

                    @Override
                    public void onAdFailedToShowFullScreenContent(@NonNull AdError adError)
                    {
                        // Called when fullscreen content failed to show.
                        Log.d(TAG,"The Ad failed to show");
                    }

                    @Override
                    public void onAdImpression()
                    {
                        super.onAdImpression();
                    }

                    @Override
                    public void onAdShowedFullScreenContent()
                    {
                        // Called when fullscreen content is shown.
                        // Make sure to set your reference to null so you don't
                        // show it a second time.
                        mInterstitialAd = null;
                        Log.d(TAG,"The Ad was shown");
                    }
                });
                mInterstitialAd.show(this);
            }
        });
    }
}

Output AdMob Full Screen Ads

Your app is now ready to display full screen ads. When you run the above example, you will get a result like as shown below.

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