How to Integrate Google Admob Rewarded Video Ads in Android?

To integrate Google AdMob Rewarded Video Ads in an Android application, follow the steps below:

1. Setup Google AdMob:

If you haven't already, sign up for an AdMob account.
Add your app to AdMob, ensuring you create a Rewarded Video Ad unit and note down the Ad Unit ID.

2. Add Dependency:

In your build.gradle (app module), add the Google Mobile Ads SDK:

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

Replace latest_version with the most recent version of the SDK. Then, sync the project.

3. Initialize Mobile Ads SDK:

In your AndroidManifest.xml, add the following meta-data tag inside the <application> tag:

<meta-data
    android:name="com.google.android.gms.ads.APPLICATION_ID"
    android:value="YOUR_ADMOB_APP_ID"/>

Replace YOUR_ADMOB_APP_ID with your AdMob App ID.

Initialize the SDK in the onCreate() method of your Application class:

import com.google.android.gms.ads.MobileAds;

public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        MobileAds.initialize(this, initializationStatus -> {});
    }
}

Make sure you reference MyApplication in your AndroidManifest.xml:

<application
    android:name=".MyApplication"
    ...>
</application>

4. Load and Display the Rewarded Video Ad:

In your activity or fragment:

import com.google.android.gms.ads.rewarded.RewardedAd;
import com.google.android.gms.ads.rewarded.RewardedAdLoadCallback;

public class YourActivity extends AppCompatActivity {

    private RewardedAd rewardedAd;

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

        rewardedAd = new RewardedAd(this, "YOUR_AD_UNIT_ID");
        
        RewardedAdLoadCallback adLoadCallback = new RewardedAdLoadCallback() {
            @Override
            public void onRewardedAdLoaded() {
                // Ad successfully loaded, can now be shown
                if (rewardedAd.isLoaded()) {
                    rewardedAd.show(YourActivity.this, rewardItem -> {
                        // User earned the reward
                    });
                }
            }

            @Override
            public void onRewardedAdFailedToLoad(int errorCode) {
                // Ad failed to load
            }
        };

        rewardedAd.loadAd(new AdRequest.Builder().build(), adLoadCallback);
    }
}

Replace YOUR_AD_UNIT_ID with your AdMob Rewarded Video Ad Unit ID.

5. Testing:

Before releasing, ensure you test your integration. Use Google's test ad units so you don't accidentally click on your own live ads, which can result in your AdMob account being suspended:

rewardedAd = new RewardedAd(this, "ca-app-pub-3940256099942544/5224354917");

This is a test Ad Unit ID for Rewarded Videos from Google. Make sure to replace it with your actual Ad Unit ID before releasing your app.

6. Finalize:

After integrating, be sure to handle all the lifecycle and reward callbacks as necessary for your app's use case. Once testing is complete, ensure you've replaced any test Ad Unit IDs with real ones.

Remember to always keep user experience in mind. Ensure your users understand why and when they'll see rewarded videos and what they'll get in return.

Adding AdMob rewarded video ads to Android Studio project:
- Add AdMob rewarded video ads to your Android Studio project by following these steps:
  - Open your build.gradle file and add the AdMob SDK dependency.
```
implementation 'com.google.android.gms:play-services-ads:20.4.0'
```
  - Sync your project to fetch the new dependency.
  - Update your activity or fragment code to include the AdMob rewarded video ad.

Displaying AdMob rewarded videos in Android app:

Display AdMob rewarded video ads in your Android app by integrating the rewarded video ad and handling reward delivery. Here's a simplified example:

// MainActivity.java
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.ads.AdError;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.MobileAds;
import com.google.android.gms.ads.rewarded.RewardItem;
import com.google.android.gms.ads.rewarded.RewardedAd;
import com.google.android.gms.ads.rewarded.RewardedAdLoadCallback;

public class MainActivity extends AppCompatActivity {

    private RewardedAd rewardedAd;

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

        // Initialize the Mobile Ads SDK
        MobileAds.initialize(this);

        // Load the rewarded video ad
        loadRewardedAd();

        // Show the rewarded video ad when a button is clicked
        findViewById(R.id.showRewardedButton).setOnClickListener(view -> showRewardedAd());
    }

    private void loadRewardedAd() {
        RewardedAd.load(this, getString(R.string.admob_rewarded_ad_unit_id),
                new AdRequest.Builder().build(), new RewardedAdLoadCallback() {
                    @Override
                    public void onAdLoaded(RewardedAd ad) {
                        rewardedAd = ad;
                    }

                    @Override
                    public void onAdFailedToLoad(AdError adError) {
                        // Handle rewarded video ad loading failure
                    }
                });
    }

    private void showRewardedAd() {
        if (rewardedAd != null) {
            rewardedAd.show(this, rewardItem -> {
                // User completed watching the rewarded video ad
                // Grant rewards to the user
            });
        } else {
            // Rewarded video ad not loaded, handle accordingly
            loadRewardedAd(); // Retry loading the ad or show an alternative
        }
    }
}

Make sure to replace "@string/admob_rewarded_ad_unit_id" with your actual AdMob rewarded video ad unit ID.