Android: getPixel(x,y)颜色值错误

I'm an android/java newbie and am developing a simple app that will generate harmonious colours from a colour picked from a colour wheel. The problem is that I can't even get the right colour to appear in a box below the wheel (touching yellow on the colour wheel generates a purple colour :S ) I don't understand what's going on. I tried this code with several different images too, and the colours generated are still all off.. I'm an android/java newbie and am developing a