Android Question Device Camera change settings manually


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Currently I'm using the AdvancedCamera 4.60 library to take pictures from my app. I'm using the feature ExposureCompensation +- to get better pictures with back light, but this feature helps only if the backlight is not to much.

Is it possible to change the shutter speed and the camera aperture manually in case of worst light conditions? Alternatively it should be possible to set the exposure spot not in to the middle of the picture, is it possible to place the spot of light measurement for example to the upper left edge? Or is it possible to implement feature like the AE-L (Auto Exposure - Lock)?