What measures, should take to protect our app from reverse engineered

Thanks for your answer, but i am using every technique , having difficulty in storing the encyrption keys. Do you have any idea how to store static string value used for encyrption.

*Currently i am using R8 but for static keys its doesn't make any sense.

To protect your app from reverse engineering:

• Obfuscate your code to make it hard to understand.
• Use strong encryption for sensitive data and logic.
• Remove debug info from release builds.
• Detect tampering or debugging at runtime.
• Code-sign your app to ensure integrity.

Tools you can use

• Dotfuscator (for .NET apps)
• ConfuserEx (open-source .NET obfuscator)
• ProGuard / R8 (for Android)
• DexGuard (commercial, advanced for Android)

These tools make reverse engineering more difficult but not impossible; always combine multiple layers of protection.