NatCamDevice.java

Camera.Parameters params = camera.getParameters();
if (params.getMaxNumMeteringAreas() > 0 && params.getMaxNumFocusAreas() > 0) {
    ...
    LogVerbose("Attempting to focus camera " + index + " at (" + Math.round(x * 100) / 100f + ", " + Math.round(y * 100) / 100f + ")");
} else {
    ...
    LogError("Camera "+index+" does not support focus"); // Control only reaches here when the check above fails
}