title: Android color picker - updating color array
body: <p>I'm trying to create a color picker for Android that looks like a minimalistic version of Gimp's. So, it has a hue slider and a rectangle with saturation/value variants of a color chosen in hue slider.</p>
  
  <p>Question: what is the best way to create the rectangle?</p>
  
  <p>Right now, I'm creating an 200x200 array of pixels, but it takes ~5sec to create and display rectangle with that array. And I need colors in rectangle to change whenever I change the value in hue slider...</p>
  
  <p>Rectangle is bitmap, btw. Can I use color matrices on that and how? Any examples?</p>
  
  <p>Thanks in advance!</p>