我正在构建一个具有系统权限的企业应用程序，它需要使用 BluetoothAdapter 类 setScanMode 中的一个函数。这是一个隐藏的API，仅适用于系统签名的apks，现在这个函数上面有@UnsupportedAppUsage，任何人都可以帮助我理解这个注释。
最佳答案
如果我们转到 annotation source :
/**
* Indicates that a class member, that is not part of the SDK, is used by apps.
* Since the member is not part of the SDK, such use is not supported.
*
* <p>This annotation acts as a heads up that changing a given method or field
* may affect apps, potentially breaking them when the next Android version is
* released. In some cases, for members that are heavily used, this annotation
* may imply restrictions on changes to the member.
*
* <p>This annotation also results in access to the member being permitted by the
* runtime, with a warning being generated in debug builds.
*
* <p>For more details, see go/UnsupportedAppUsage.
*
* {@hide}
*/
基本上，这意味着它正在被应用程序使用，即使它在技术上不是 SDK 的一部分，因此不受支持。这似乎更像是对任何为 AOSP 做出贡献的人的警告，而不是你需要担心太多的事情。
关于android - @UnsupportedAppUsage 注解描述了什么，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52499754/