How to avoid reverse engineering of an APK file?

Question

I am developing a payment processing app for Android, and I want to prevent a hacker from accessing any resources, assets or source code from the APK file.<

Answer 1

The main question here is that can the dex files be decompiled and the answer is they can be "sort of". There are disassemblers like dedexer and smali.

ProGuard, properly configured, will obfuscate your code. DexGuard which is a commercial extended version of ProGuard, may help a bit more. However, your code can still be converted into smali and developers with reverse-engineering experience will be able to figure out what you are doing from the smali.

Maybe choose a good license and enforce it by the law in best possible way.