CAMERA VIEW VERSION 1.0.0-alpha20

DESCRIPTION: There is no method to get torch availability in CameraController. Also, the camera is completely encapsulated so I can not check hasTroch() method.

ADDITIONAL INFORMATION: I managed to do it with the next, but it is not something I would like to do further:

  private fun getTorchAvailability(cameraController: LifecycleCameraController): Boolean {
    val privateCameraField = cameraController::javaClass.get().superclass.getDeclaredField("mCamera")
    privateCameraField.isAccessible = true
    val camera =  privateCameraField.get(cameraController) as Camera?
    return camera?.cameraInfo?.hasFlashUnit() ?: false
  }

or something a bit safer but maybe not accurate:

  // Assume non face camera have torch and check system feature for the back camera
  private fun getTorchAvailability(cameraController: LifecycleCameraController): Boolean {
    return cameraController.cameraSelector == CameraSelector.DEFAULT_BACK_CAMERA &&
        requireContext().packageManager.hasSystemFeature(android.content.pm.PackageManager.FEATURE_CAMERA_FLASH)
  }