public static void setBestExposure(Camera.Parameters parameters, boolean lightOn) {
int minExposure = parameters.getMinExposureCompensation();
int maxExposure = parameters.getMaxExposureCompensation();
float step = parameters.getExposureCompensationStep();
if ((minExposure != 0 || maxExposure != 0) && step > 0.0f) {
// Set low when light is on
float targetCompensation = lightOn ? MIN_EXPOSURE_COMPENSATION : MAX_EXPOSURE_COMPENSATION;
int compensationSteps = Math.round(targetCompensation / step);
float actualCompensation = step * compensationSteps;
// Clamp value:
compensationSteps = Math.max(Math.min(compensationSteps, maxExposure), minExposure);
if (parameters.getExposureCompensation() == compensationSteps) {
Log.i(
TAG,
"Exposure compensation already set to "
+ compensationSteps
+ " / "
+ actualCompensation);
} else {
Log.i(
TAG,
"Setting exposure compensation to " + compensationSteps + " / " + actualCompensation);
parameters.setExposureCompensation(compensationSteps);
}
} else {
Log.i(TAG, "Camera does not support exposure compensation");
}
}
