Hardcoded secrets: string encryption is not the final answer

Classify the value first

Android warns about hardcoded cryptographic secrets. Public client identifiers, privileged server API keys and device-generated keys need different handling. Encrypting every string adds maintenance work while potentially leaving privileged service access in every client copy.

Offline apps still need exposure reduction

Scan packages and resources before release; remove test accounts, production logs and privileged backend credentials. Use appropriate platform storage for device-specific secrets without conflating storage security with algorithm secrecy. A shipped universal key requires permission and rotation work, not merely a more complex decryptor.

Your checklist

• Separate public identifiers from privileged secrets.
• Check resources and nested dependencies.
• Revoke or rotate leaks before code cleanup.