Strobe light doesn't work under Android 6 or 7

[RetireeJay46]

Android changed the way you access the camera object in versions 6 and higher. I did download your code from Github, but I'm not a good enough Java programmer to untangle how to use the new Camera2 object. See https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#openCamera(java.lang.String,%20android.hardware.camera2.CameraDevice.StateCallback,%20android.os.Handler)