Google Ad Integration

1 ) Activity Main

<?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"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/msg_welcome" />
    <Button
        android:id="@+id/btn_fullscreen_ad"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="@string/btn_fullscreen_ad" />
    <Button
        android:id="@+id/btn_show_rewarded_video"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/btn_fullscreen_ad"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:text="@string/btn_rewarded_video" />
    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        ads:adSize="BANNER"
        ads:adUnitId="@string/banner_home_footer"/>
</RelativeLayout>

2 )  Main Activity

public class MainActivity extends AppCompatActivity {
    private AdView mAdView;
    private Button btnFullscreenAd, btnShowRewardedVideoAd;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnFullscreenAd = (Button) findViewById(R.id.btn_fullscreen_ad);
        btnShowRewardedVideoAd = (Button) findViewById(R.id.btn_show_rewarded_video);
        btnFullscreenAd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, InterstitialAdActivity.class));
            }
        });
        btnShowRewardedVideoAd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, RewardedVideoAdActivity.class));
            }
        });
        // TODO - remove this if condition
        // it's for demo purpose
        if (TextUtils.isEmpty(getString(R.string.banner_home_footer))) {
            Toast.makeText(getApplicationContext(), "Please mention your Banner Ad ID in strings.xml", Toast.LENGTH_LONG).show();
            return;
        }
        mAdView = (AdView) findViewById(R.id.adView);
//        mAdView.setAdSize(AdSize.FULL_BANNER);
//        mAdView.setAdUnitId(getString(R.string.banner_home_footer));
        AdRequest adRequest = new AdRequest.Builder()
                .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
                // Check the LogCat to get your test device ID
                .addTestDevice("C04B1BFFB0774708339BC273F8A43708")
                .build();
        mAdView.setAdListener(new AdListener() {
            @Override
            public void onAdLoaded() {
            }
            @Override
            public void onAdClosed() {
                Toast.makeText(getApplicationContext(), "Ad is closed!", Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onAdFailedToLoad(int errorCode) {
                Toast.makeText(getApplicationContext(), "Ad failed to load! error code: " + errorCode, Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onAdLeftApplication() {
                Toast.makeText(getApplicationContext(), "Ad left application!", Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onAdOpened() {
                super.onAdOpened();
            }
        });
        mAdView.loadAd(adRequest);
    }
    @Override
    public void onPause() {
        if (mAdView != null) {
            mAdView.pause();
        }
        super.onPause();
    }
    @Override
    public void onResume() {
        super.onResume();
        if (mAdView != null) {
            mAdView.resume();
        }
    }
    @Override
    public void onDestroy() {
        if (mAdView != null) {
            mAdView.destroy();
        }
        super.onDestroy();
    }
}

3 ) My Application

public class MyApplication extends Application {
        @Override
        public void onCreate() {
            super.onCreate();
            // initialize the AdMob app
            MobileAds.initialize(this, getString(R.string.admob_app_id));
        }
}

4) InterstitialAdActivity

public class InterstitialAdActivity extends AppCompatActivity {
    private String TAG = InterstitialAdActivity.class.getSimpleName();
    InterstitialAd mInterstitialAd;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_interstitial_ad);
        mInterstitialAd = new InterstitialAd(this);
        // set the ad unit ID
        mInterstitialAd.setAdUnitId(getString(R.string.interstitial_full_screen));
        AdRequest adRequest = new AdRequest.Builder()
                .build();
        // Load ads into Interstitial Ads
        mInterstitialAd.loadAd(adRequest);
        mInterstitialAd.setAdListener(new AdListener() {
            public void onAdLoaded() {
                showInterstitial();
            }
        });
    }
    private void showInterstitial() {
        if (mInterstitialAd.isLoaded()) {
            mInterstitialAd.show();
        }
    }
}

5 ) RewardedVideoAdActivity

public class RewardedVideoAdActivity extends AppCompatActivity {

    private RewardedVideoAd mRewardedVideoAd;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rewarded_video_ad);
        MobileAds.initialize(this, getString(R.string.admob_app_id));
        mRewardedVideoAd = MobileAds.getRewardedVideoAdInstance(this);
        mRewardedVideoAd.setRewardedVideoAdListener(new RewardedVideoAdListener()
        {
            @Override
            public void onRewarded(RewardItem rewardItem) {
                Toast.makeText(RewardedVideoAdActivity.this, "onRewarded! currency: " + rewardItem.getType() + "  amount: " +
                        rewardItem.getAmount(), Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onRewardedVideoAdLeftApplication() {
                Toast.makeText(RewardedVideoAdActivity.this, "onRewardedVideoAdLeftApplication",
                        Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onRewardedVideoAdClosed() {
                Toast.makeText(RewardedVideoAdActivity.this, "onRewardedVideoAdClosed", Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onRewardedVideoAdFailedToLoad(int errorCode) {
                Toast.makeText(RewardedVideoAdActivity.this, "onRewardedVideoAdFailedToLoad", Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onRewardedVideoCompleted() {
            }
            @Override
            public void onRewardedVideoAdLoaded() {
                Toast.makeText(RewardedVideoAdActivity.this, "onRewardedVideoAdLoaded", Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onRewardedVideoAdOpened() {
                Toast.makeText(RewardedVideoAdActivity.this, "onRewardedVideoAdOpened", Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onRewardedVideoStarted() {
                Toast.makeText(RewardedVideoAdActivity.this, "onRewardedVideoStarted", Toast.LENGTH_SHORT).show();
            }
        });
        loadRewardedVideoAd();
    }
    private void loadRewardedVideoAd() {
        mRewardedVideoAd.loadAd(getString(R.string.rewarded_video),
                new AdRequest.Builder().build());
        // showing the ad to user
        showRewardedVideo();
    }
    private void showRewardedVideo() {
        // make sure the ad is loaded completely before showing it
        if (mRewardedVideoAd.isLoaded()) {
            mRewardedVideoAd.show();
        }
    }
    @Override
    public void onResume() {
        mRewardedVideoAd.resume(this);
        super.onResume();
    }
    @Override
    public void onPause() {
        mRewardedVideoAd.pause(this);
        super.onPause();
    }
    @Override
    public void onDestroy() {
        mRewardedVideoAd.destroy(this);
        super.onDestroy();
    }
}

6 ) String XML

<resources>
    <string name="app_name">GoogleAdDemo</string>
    <string name="title_activity_second_activiy">Interstitial</string>
    <string name="msg_welcome">Welcome to Admob. Click on the below button to launch the Interstitial ad.</string>
    <string name="btn_fullscreen_ad">Show Interstitial Ad</string>
    <string name="btn_rewarded_video">Show Rewarded Video Ad</string>
    <string name="admob_app_id">ca-app-pub-5143428618938264~9382068217</string>
    <string name="banner_home_footer">ca-app-pub-5143428618938264/2788739701</string>
    <string name="interstitial_full_screen">ca-app-pub-5143428618938264/3790830187</string>
    <string name="rewarded_video">ca-app-pub-3940256099942544/5224354917</string>
</resources>

Notes :
1 ) Require Gradle

implementation 'com.android.support:appcompat-v7:27.1.1'implementation 'com.android.support.constraint:constraint-layout:1.1.1'androidTestImplementation 'com.android.support.test:runner:1.0.2'androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'implementation 'com.google.android.gms:play-services-ads:15.0.1'