TrivialDrive vs TrivialDrive V2?

Question

Why are there two versions of TrivialDrive?

https://github.com/googlesamples/android-play-billing

Which version should be the main reference project for learning in-app billing? What's the difference between the versions?

Answer 1

A little searching shows that Trival Drive V2 sample has a shared build.gradle file:

https://github.com/googlesamples/android-play-billing/blob/master/TrivialDrive_v2/shared-module/build.gradle

which has the following line:

compile 'com.android.billingclient:billing:dp-1'

Looking at the documentation here:

https://developer.android.com/google/play/billing/billing_library.html

Shows that Google just released a new version of the Billing Library release dp-1:

Starting with Play Billing Library release dp-1 (June 2017), the minimum supported API level is Android 2.2 (API level 8). The minimum supported In-app Billing API is version 3.

And specifically calls out changes to the minimum support Android API and In-app Billing API.

Given the Trivial Drive V2 sample app(s) has a Wear 2.0 example - this version has billing support on Wear 2.0 apps.