Dexprotector provides all the features you need for complete protection of your Android applications:
DexProtector uses a strong cryptographic algorithms to encrypt String data and
Protection against analysis and cracking
Allows you to hide sensitive API calls: Android Security, Google Licensing, application's internal logic and mission critical third-party libraries.
DexProtector injects checks in an APK file that guarantee the application will stop
functioning if re-signed, modified or re-built.