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OpenCV native camera (VideoCapture) on Android uses the same back-end as standard java camera. So the facilities are the same. As I know, there is no Standard Android API for precise camera control. The only thing you can do is to estimate relative changes in luminance. You need to lock white balance correction and exposure correction with setAutoWhiteBalanceLock and setAutoExposureLock.
There is project FCam. It is developing library for precise camera control. It was designed for Maemo OS, but there are ports for other platforms. I do not found Android port, but this page may be interesting.
