title: how to keep my Launcher out of being kill by OS?
body: <p>I am working on a project of 3rd-party Android Launcher.
  I find it being killed often by OS when running in background, even it is the default Launcher.</p>
  
  <p>OS will kill many apps when available memory is not enough, I guest that the reason why my Launcher is killed.</p>
  
  <p>So my question is what should I do to decrease the chance of being killed ?</p>