Build your own licensing system in C and compile it via the android ndk. Use obfuscation and antidebug. Self modifying code if you want to be risky. Code your o

Build your own licensing system in C and compile it via the android ndk. Use obfuscation and antidebug. Self modifying code if you want to be risky. Code your own vm if you really want to be secure. Make sure your licensing system is called from all over the program, so that it cannot be removed at any one point. Finally, add a couple of integrity checks that check themselves and each other. Do all that and i guarantee your app will remain uncracked for a couple of months. Or,simply spend the time improving your app, and learn to live with the fact that your app will be cracked.