https://developers.google.cn/android/reference/com/google/android/gms/vision/CameraSource.ShutterCallback
CameraSource.ShutterCallback | Google Play services | Google for Developers
google play servicesdevelopers
https://developers.google.com/android/reference/com/google/android/gms/vision/CameraSource.Builder?authuser=4
CameraSource.Builder | Google Play services | Google for Developers
google play servicesbuilderdevelopers