title: Can you run an old app on a new version of the android
body: <p>Okay so this doesn't really have much to do with code help but I am just starting my final year project and will be developing preferably for Android mobile devices. The plan is to create it in Android 2.1 as I only have a used HTC hero but my testers have a mix of version androids. and not many have a new HTC One or new Nexus, so i presume that they are all using older versions of the OS.</p>
  
  <p>So what I need to know is, will I be able to create the application in 2.1 and it run on new versions of the OS (preferably phones not tablets, if it matters)?</p>