title: Is there any binary diff tool for android apk special for android apk file?
body: <p>when trying to reduce the apk file size when updating, someone suggest to use <code>bsdiff</code> to make binary patch and merge the patch on client side. But I think this is a common binary diff tool and we can get smaller patch file like <code>chrome</code> do using <a href="http://dev.chromium.org/developers/design-documents/software-updates-courgette" rel="nofollow">Courgette</a>, which working for <code>exe</code> file and get a more smaller patch file.</p>
  
  <p>Is there any tool like <code>Courgette</code>? And if not, why don't Google develop some tool like it for us android developer?</p>