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Tutorials > Android App Development > Implementing in-app purchases and advertisements

Implementing in-app purchases and advertisements

Implementing in-app purchases and advertisements is a common way for Android app developers to monetize their apps. In this section, I will explain how to implement in-app purchases and advertisements in your Android app, and provide some code examples.

Implementing in-app purchases: To implement in-app purchases, you will need to use the Google Play Billing Library, which provides an interface for your app to communicate with the Google Play Store and manage in-app purchases. Here's an example of how to implement in-app purchases in your app:

  • Add the following dependency to your app's build.gradle file:
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implementation 'com.android.billingclient:billing:4.0.0'
  • Initialize the billing client in your activity or fragment:
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private BillingClient billingClient;

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

    billingClient = BillingClient.newBuilder(this).setListener(this).build();
    billingClient.startConnection(new BillingClientStateListener() {
        @Override
        public void onBillingSetupFinished(BillingResult billingResult) {
            if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
                // The billing client is ready to use.
            }
        }

        @Override
        public void onBillingServiceDisconnected() {
            // Try to restart the connection on the next request to
            // Google Play by calling the startConnection() method.
        }
    });
}
  • Create a button or other user interface element that triggers the in-app purchase flow:
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public void onBuyButtonClicked() {
    SkuDetailsParams.Builder params = SkuDetailsParams.newBuilder();
    params.setSkusList(Arrays.asList("premium_upgrade"))
            .setType(BillingClient.SkuType.INAPP);

    billingClient.querySkuDetailsAsync(params.build(),
            new SkuDetailsResponseListener() {
                @Override
                public void onSkuDetailsResponse(BillingResult billingResult, List<SkuDetails> skuDetailsList) {
                    if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK
                            && skuDetailsList != null && skuDetailsList.size() > 0) {
                        // Display the available in-app purchase options to the user.
                    }
                }
            });
}
  • Handle the user's purchase by implementing the PurchasesUpdatedListener interface:
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@Override
public void onPurchasesUpdated(BillingResult billingResult, List<Purchase> purchases) {
    if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK
            && purchases != null && purchases.size() > 0) {
        // Handle the user's purchase here.
    }
}

Implementing advertisements: To implement advertisements in your app, you can use a third-party ad network like AdMob or implement your own custom ads. Here's an example of how to implement AdMob in your app:

  • Add the following dependency to your app's build.gradle file:
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implementation 'com.google.android.gms:play-services-ads:20.4.0'
  • Initialize the AdMob SDK in your activity or fragment:
typescript
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MobileAds.initialize(this, new OnInitializationCompleteListener() {
    @Override
    public void onInitializationComplete(InitializationStatus initializationStatus) {
        // The AdMob SDK is ready to use.
    }
});
  • Create an AdView object in your layout:
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<com.google.android.gms.ads.AdView
    android:id="@+id/adView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:adSize="BANNER"
    app:adUnitId="ca-app-pub-xxxxxxxxxxxxxxxx/yyyyyyyyyy">
</com.google.android.gms.ads.AdView>

Make sure to replace the adUnitId attribute with your own AdMob ad unit ID.

  • Load the ad into the AdView:
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AdView adView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);

This will load a banner ad into the AdView. You can also load other types of ads, such as interstitial or rewarded ads, by using the corresponding ad units and ad types in the AdMob SDK.

  • Optionally, you can handle ad events and user interactions by implementing the AdListener interface:
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AdView adView = findViewById(R.id.adView);
adView.setAdListener(new AdListener() {
    @Override
    public void onAdLoaded() {
        // The ad has been loaded.
    }

    @Override
    public void onAdFailedToLoad(LoadAdError loadAdError) {
        // The ad failed to load.
    }

    @Override
    public void onAdClicked() {
        // The user clicked on the ad.
    }
});

By implementing the AdListener interface, you can handle events such as when the ad has been loaded, when the ad failed to load, or when the user clicked on the ad.



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