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CAMERA_PERMISSION
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Permission to access the camera is required.
On Android before version 6.0 the camera permission must be declaredin the manifest.
On Android 6.0 and later in addition to the manifest declaration the camera permission must be granted bythe user during run-time.
On Android 6.0 and later you need to ask the user for the camera permission before you check therequirements.
Camera permission is required for checking the other requirements.