title: Android: How to modify Settings app?
body: <p>I would like to hack around the Android default Settings app for prototyping purposes. What is the correct procedure for building and installing the "customized" app?</p>
  
  <p>After I modify the Settings source in the platform source tree, how to I build it? After I build it, can I install Settings by itself, or do I rebuild and reinstall the entire Android platform image?</p>