title: Increase memory consumption after recreate activity
body: <p>My app has one activity and 6 fragment in this activity (ViewPager) , this app in normal usage uses 120MB of ram , when i close the app and reopen , memory consumption will increase (up to 200MB) and this will happen as long as I do this .</p>
  
  <p>I tried :
  1- recycle bitmaps after use
  2- unregister listeners in OnDestroy()
  3- Runtime.getRuntime().gc()
  ...</p>
  
  <p>Android Studio profiler (first creation of activity) :
  Code : 21.5 MB
  Graphics 38.7 MB
  Native : 14.4 MB
  Java : 42.5 MB
  Others : 4 MB</p>
  
  <p>Questions :
  1- what should I do ?
  2- what's the Graphics and Java and Code in profiler ?</p>
  
  <p>Thanks .</p>