title: Storing credentials in the Android app
body: <p>How can we safely storing credentials data for access to the smtp-server in Android app? These data are constants and only the developer should know them. At the moment they are stored in the code, but this is not safe, because they can be seen by decompiling the application.</p>
  
  <p>Is it possible to use Android Keystore System for this purpose and how? And most importantly, will Android Keystore be effective on rooted devices?</p>