You’re experienced in building Android apps but have trouble with the conversion rate? Ivan will talk about the monetization models Google Play offers and demonstrate how to use them in your apps.

1. We're an independent
design & development
agency.

2. In-app billing
IVAN MARIĆ

3. Average people earn money
doing things they don’t like.
Rich people follow their
passion.
- STEVE SIEBOLD

4. GOOGLE PLAY

5. MONETIZE
Premium - simple and convient
Freemium - durable and consumable digital goods
Subscription - continuing revenue stream
AdMob Ads - easy way to earn revenue

6. Total revenue by model

7. https://support.google.com/googleplay/android-developer/table/
3539140?hl=en&rd=1
MERCHANT ACCOUNT
Google Play Developer Console - Financial reports
Not supported in all countries

8. IMPLEMENTATION

9. Sample project
https://github.com/googlesamples/android-play-billing
Consumable good
SubscriptionDurable good

10. ADD AIDL FILE
IInAppBillingService.aidl
<sdk>/extras/google/play_billing/
src/main/aidl/com.android.vending.billing
IInAppBillingService.java

11. ANDROID MANIFEST
<uses-permission android:name="com.android.vending.BILLING" />
Upload to Alpha/Beta channel

12. Intent serviceIntent = new Intent(
“com.android.vending.billing.InAppBillingService.BIND");
serviceIntent.setPackage(“com.android.vending”);
context.bindService(serviceIntent,
serviceConnection,
Context.BIND_AUTO_CREATE);
context.unbindService(serviceConnection);
Service connection

13. private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
billingService = IInAppBillingService.Stub.asInterface(service);
int r = billingService.isBillingSupported(3, packageName, itemType);
if (r == 0) {
// Billing supported
return;
}
}
};
Service connection

14. private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
billingService = IInAppBillingService.Stub.asInterface(service);
int r = billingService.isBillingSupported(3, packageName, "inapp");
if (r == 0) {
// Billing supported
return;
}
}
};
Service connection

15. private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
billingService = IInAppBillingService.Stub.asInterface(service);
int r = billingService.isBillingSupported(5, packageName, "subs");
if (r == 0) {
// Billing supported
return;
}
}
};
Service connection

16. Response

17. GET DETAILS
Information about the item
Localised
Items are immutable

18. // Split the sku list in blocks of no more than 20 elements.
Bundle querySkus = new Bundle();
querySkus.putStringArrayList("ITEM_ID_LIST", skuPartList);
Bundle skuDetails = billingService.getSkuDetails(
3, packageName, itemType, querySkus);

19. Bundle skuDetails = billingService.getSkuDetails(
3, packageName, itemType, querySkus);

20. GET PURCHASES
User owned items
Use for restore

21. Bundle ownedItems = billingService.getPurchases(
3, packageName, itemType, continueToken);

22. BUY INTENT
Get PendingIntent to launch the purchase flow
Purchase flow is handle by Google Play
Response for purchase order received in onActivityResult

23. Bundle buyIntent = billingService.getBuyIntent(
3, packageName, sku, itemType, payload);
PendingIntent intent = buyIntent.getParcelable("BUY_INTENT");
activity.startIntentSenderForResult(intent.getIntentSender(),
requestCode, new Intent(), 0, 0, 0);

24. Bundle buyIntent = billingService.getBuyIntentToReplaceSkus(
5, packageName, oldSku, sku, "subs", payload);
PendingIntent intent = buyIntent.getParcelable("BUY_INTENT");
activity.startIntentSenderForResult(intent.getIntentSender(),
requestCode, new Intent(), 0, 0, 0);
Subscription upgrade/downgrade

26. CONSUME ITEM
Purchased item is owned by the user forever
Can not purchase an item more than once
Remove item from the owner to purchase again

27. // Don’t call this on UI thread
billingService.consumePurchase(3, packageName, token);

28. TESTING

29. STATIC TEST
Used for testing response models
Verify signatures
android.test.purchased, android.test.canceled,
android.test.refunded, android.test.item_unavailable

30. REAL TEST
Setup test accounts in Google Developer Console
Real purchase without money transaction
All subscriptions last one day
Missing orderId property

31. SECURITY

32. SIGNED RESPONSES
Verify purchase JSON response
Licence key as public key portion
Best practice to do this on a server side

33. GOOGLE PLAY DEVELOPER API
Use www.googleapis.com for checking purchase status
Manage subscriptions

34. https://www.reddit.com/r/Piracy/comments/3eo8sj/
antipiracy_measures_on_android_custom_roms/
HACKER APPS
Rooted devices
Change the behaviour of the system and apps

35. PROTECT YOUR CONTENT
Do not provide content with .apk
Encrypt content with device specific key
Recoverable data

36. DOCUMENTATION

37. http://developer.android.com/google/play/billing/index.html
GOOGLE SERVICE
Overview
Version 3 API
Security and Design
Testing In-app Billing
Administering In-app Billing

38. http://developer.android.com/training/in-app-billing/index.html
TRAINING
Preparing Your App
Establishing Products for Sale
Purchasing Products
Testing Your App

39. WATCH OUT FOR
Developer payload
Calling consume request on Main thread
Subscription downgrade/upgrade (v3 / v5)
AIDL file (https://github.com/googlesamples/android-play-billing/issues/3)
Limitations
http://stackoverflow.com/questions/13717091/android-error-while-
retrieving-information-from-server-rpcs-5aec-0-in-google

40. HTTP://BLOG.GOFORYT.COM/
VALIDATING-ANDROID-APP-
PURCHASES-LARAVEL/

41. Any questions?
IVAN.MARIC@INFINUM.CO
IVAN MARIĆ
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