RequiresApi vs TargetApi android批注

问题描述：

RequiresApi和TargetApi有什么区别?

科特林样品:

@RequiresApi(api = Build.VERSION_CODES.M)
@TargetApi(Build.VERSION_CODES.M)
class FingerprintHandlerM() : FingerprintManager.AuthenticationCallback()

注意:FingerprintManager.AuthenticationCallback需要api M

NOTE: FingerprintManager.AuthenticationCallback requires api M

注意2:如果我不使用TargetApi，则皮棉会失败，并显示错误class requires api level 23...

答

@RequiresApi-表示带注释的元素只能在给定的API级别或更高级别上调用.

@RequiresApi - Denotes that the annotated element should only be called on the given API level or higher.

@TargetApi-表示无论项目目标是什么，Lint都应将此类型视为针对给定的API级别.

@TargetApi - Indicates that Lint should treat this type as targeting a given API level, no matter what the project target is.