title: onCreate being called on Activity A in up navigation
body: <p>So I have an Activity A and an Activity B. I want Activity A to be able to navigate to Activity B with the press of a button. That works, but when I use the up navigation(the home button in the action bar) to navigate back to Activity A, onCreate() is called again and the old information that the user typed in is lost. </p>
  
  <p>I've seen: <a href="https://stackoverflow.com/questions/11347161/oncreate-always-called-if-navigating-back-with-intent">onCreate always called if navigating back with intent</a>, but they used Fragments, and I'm hoping not to have to redesign the entire app to use fragments. Is there any way I can stop onCreate() from being called every time Activity A becomes active again?</p>