title: Update android app java code without reinstall an APK
body: <p>I have jar library that developers can integrate in their Android app. The problem is that developers update my library very rarely, for example once in a year. For that time may not work due to new Android version, or I found critical bug after integration in my library.</p>
  
  <p>Is it possible that library can update itself without update an APK?
  Something like using downloadable jar or dex file.</p>