Android 未解析的引用：主密钥

我试图遵循这里给出的示例：

我已将所需的库包括在我的学位中：

implementation "androidx.security:security-crypto:1.0.0"

// For Identity Credential APIs
implementation "androidx.security:security-identity-credential:1.0.0-alpha02"

但当我尝试使用代码时：

val mainKey = MasterKey.Builder(applicationContext)
    .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
    .build()

我得到未解析的引用：MasterKey错误。图书馆有那门课吗

---

提前感谢。

将库升级至最新版本（撰写本文时为1.1.0-alpha03）

从中，在版本1.1.0-alpha01上添加了主密钥

Version 1.1.0-alpha01
...
New MasterKey class provides more options for keys, also deprecating MasterKeys to support new features and versions of Android that do not have KeyGenParamSpec.

Version 1.1.0-alpha01
...
New MasterKey class provides more options for keys, also deprecating MasterKeys to support new features and versions of Android that do not have KeyGenParamSpec.