如何使用Camera2定义自定义android.hardware.camera2.CaptureRequest.Key？

Question

我想定义一个自定义android.hardware.camera2.CaptureRequest.Key，它与Android Camera2在CaptureRequest.java中不存在，但是发生了以下错误：

java.lang.IllegalArgumentException: Could not find tag for key 'gsFaceBeauty')
    at android.hardware.camera2.impl.CameraMetadataNative.nativeGetTagFromKeyLocal(Native Method)
    at android.hardware.camera2.impl.CameraMetadataNative.setBase(CameraMetadataNative.java:978)
    at android.hardware.camera2.impl.CameraMetadataNative.set(CameraMetadataNative.java:429)
    at android.hardware.camera2.impl.CameraMetadataNative.set(CameraMetadataNative.java:433)
    at android.hardware.camera2.CaptureRequest$Builder.set(CaptureRequest.java:590)