Problem with Android licensing service

Question

I implemented Licensing Service in my application using the sample given with licensing module. I am using the standard ServerManagedPolicy. I have not changed anything in the policy and it actually works fine. I have following questions.

1. Sometimes, this happens randomly though, it says that application is not licensed and asks for buying it and then I try again it works fine. So few times, it will say, app is not licensed. I have seen this both on real phone and emulator. This is a serious concern, because if the user who buys the app later on see the popup that app is not licensed, he is gonna get irritated. May I please know what is wrong with the standard ServerManagedPolicy code.

2. For a paid app, is the standard ServerManagedPolicy implementation given in the sample code enough, or do you recommend to tweak it and add / modify some checks.

Answer 1

Implementing Market license checking API is a waist of time from my experience.

My game, Elastic World, got cracked a few hours after being on the market. There's an android application called Lucky Patcher that cracks any APK that uses Market licensing API.

In the implementation of market licensing, I did everything by the book, following all google's recommendations, but Lucky Patcher always cracked the protection. I spent a couple of days on this trying several approaches, different kinds of obfuscation, placing the validation code in other areas of execution, but nothing worked.