Can you explain what is meant by the term greylisted API and what are its features?

Greylisted API in Android is an API to which access is restricted but not completely prohibited. Such APIs are considered unstable or internal, and their use is not recommended as they may change or be removed in future platform versions.

Features of greylisted API:

• They are accessible to applications, but warnings or logs may appear when used.
• Using such APIs can lead to compatibility and stability issues.
• Google gradually restricts access to greylisted APIs to encourage developers to use official public APIs.

Example: if an application uses a greylisted API, a warning may appear in the logs at startup, indicating that this API does not guarantee stability and may be blocked in the future.