title: how to restore my android game's nativeactivity (GLES layer) after phone call ends?
body: <p>I am running GLES2 using native activity in my android app. When a call ends,  I return to my app but the screen remains blank. I check the task manager, and I see that the app is still running.  Can someone point me if
  1) I have to write code to save and restore my game and which calls I must override in java to  do this
  2) there is a more automated way of restoring my app without save/restore</p>
  
  <p>Thanks,
  Madan</p>