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If you want to display something, you should give the time to the view to call it's internal redaw functionality. I know OpenCV provides this by the waitKey(10) option for namedWindows. I am guessing that you could use something sortlike?

Looking at the java docs it seems this should be possible in Android programming also

namedWindow("H-S Histogram", 1);
imshow("H-S Histogram", histImg);
waitKey(10);