title: Determining a difference between two Bitmaps
body: <p>I am looking for an efficient way to see if a bitmap has been modified.  The approach I am currently taking is using the method copyPixelsToBuffer(Buffer dst) in the Bitmap class for each image.  I can then compare these two buffers to see if there is a difference. </p>
  
  <p>It does not look like the sameAs method provided in the Bitmap class is useful in this scenario.  </p>
  
  <p>Another way that I was thinking to implement it is using the .getPixel() method and compare both images, which would lack efficiency.</p>