title: android surfaceview is no longer visible after back from other activity
body: <p>i have a question in developing some android program...</p>
  
  <p>i use surfaceview for camera preview. it works fine, but has one problem when i start other activity (by clicking something) and then back from that activity. after that, surfaceview is no longer visible. (but onclicklistener is working)</p>
  
  <p>but when i occur surfacecreated/destoryed by visible/invisible surfaceview in single activity, it works very good.</p>
  
  <p>plz give me any help.</p>