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Google AdMob Interstitial Ad Tutorial (New /Java Guide)

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Step by Step guide for AdMob Interstitial Ad implementation

Google AdMob offers a wide variety of ad formats, Banner, Adaptive Banner, and Rewarded Interstitial ads are a great way for making immeasurable revenue from your apps or games.
An interstitial ad is a full-screen ad that covers the entire area of your mobile app screen. When an app shows an interstitial ad, the user has the opportunity to either tap on the ad and follow to its destination or close it using a cross button at the top left corner of the ad.

Google AdMob Interstitial Ad Tutorial (New /Java Guide) Android version

Prerequisite for following this tutorial 

  1. Google Mobile Ads SDK 20.2.0 or higher
  2. Use Android Studio 3.2 or higher
  3. compileSdkVersion 28 or higher
  4. Optional: AdMob Account (register only when your app is in production)

Example project-level build.gradle (excerpt)

allprojects {

    repositories {

        google()

    }

}

Now time to create the Android project.

Let’s start with an Empty Activity

Name : InterAdExample

Language : Java

Minimum SDK : Android API 21: 5.0 Lollipop

Prepare the MainActivity layout

Add button to the bottom centre of a constraint layout, name this button as ‘Show’ give an id ‘showAd’.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
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:id="@+id/showAd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:text="Show"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Insert AdMob App Id (Use Test Id) to AndroidManifest.xml file 

<meta-data
    android:name="com.google.android.gms.ads.APPLICATION_ID"
    android:value="ca-app-pub-3940256099942544~3347511713"/>

Final AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bigknol.interadexample">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.InterAdExample">
        <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="ca-app-pub-3940256099942544~3347511713" />

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Add required dependency to build.gradle(:app)

implementation 'com.google.android.gms:play-services-ads:20.2.0'

Final build.gradle (:app) file will look like below 

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.bigknol.interadexample"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {



    implementation 'com.google.android.gms:play-services-ads:20.2.0'

    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

Initialise AdMob Interstitial Ad

private InterstitialAd mInterAd;
MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });

MainActivity.java [Not Final Version]

package com.bigknol.interadexample;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;

import com.google.android.gms.ads.AdError;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.FullScreenContentCallback;
import com.google.android.gms.ads.LoadAdError;
import com.google.android.gms.ads.interstitial.InterstitialAd;
import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback;

public class MainActivity extends AppCompatActivity {

    private InterstitialAd mInterAd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        AdRequest adRequest = new AdRequest.Builder().build();

        InterstitialAd.load(this,"ca-app-pub-3940256099942544/1033173712", adRequest,
                new InterstitialAdLoadCallback() {
                    @Override
                    public void onAdLoaded(@NonNull InterstitialAd interstitialAd) {

                        // an ad is loaded.
                        mInterAd = interstitialAd;
                        Log.i("MainActivity", "onAdLoaded");
                    }

                    @Override
                    public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {

                        Log.i("MainActivity", loadAdError.getMessage());
                        mInterAd = null;
                    }
                });

    }
}

Initialise button for calling the interstitial ad 

Button button = findViewById(R.id.showAd);

Show the AdMob Interstitial Ad 


//show ad
button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (mInterAd != null) {
            mInterAd.show(MainActivity.this);
        } else {
            Log.d("TAG", "The interstitial ad wasn't ready yet.");
        }
    }
});

Final version of MainActivity.java

package com.bigknol.interadexample;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.google.android.gms.ads.AdError;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.FullScreenContentCallback;
import com.google.android.gms.ads.LoadAdError;
import com.google.android.gms.ads.interstitial.InterstitialAd;
import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback;

public class MainActivity extends AppCompatActivity {

    private InterstitialAd mInterAd;


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

        Button button = findViewById(R.id.showAd);


        AdRequest adRequest = new AdRequest.Builder().build();

        InterstitialAd.load(this,"ca-app-pub-3940256099942544/1033173712", adRequest,
                new InterstitialAdLoadCallback() {
                    @Override
                    public void onAdLoaded(@NonNull InterstitialAd interstitialAd) {

                        // an ad is loaded.
                        mInterAd = interstitialAd;
                        Log.i("MainActivity", "onAdLoaded");
                    }

                    @Override
                    public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {

                        Log.i("MainActivity", loadAdError.getMessage());
                        mInterAd = null;
                    }


        });



        // show ad
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mInterAd != null) {
                    mInterAd.show(MainActivity.this);
                } else {
                    Log.d("TAG", "The interstitial ad wasn't ready yet.");
                }
            }
        });


    }
}

Final output of the project

{{CODEinterAd}}

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