O framework android tem varias libs para sergurança que são:
Criptografar DexCode
[DexProtector](https://dexprotector.com/)
[DexGuard](https://www.guardsquare.com/en/dexguard)
Criptografar ByteCode
[JNI](https://medium.com/@abhi007tyagi/storing-api-keys-using-android-ndk-6abb0adcadad)
Criptografar Dados
https://medium.com/@josiassena/using-the-android-keystore-system-to-store-sensitive-information-3a56175a454b