title: Activity fields referencing UI elements
body: <p>It would be "cheaper" to store reference to layout element rather than findViewById every time you need it, but wouldn't it prevent garbage collection? My assumption is that in onStop state views get destroyed, at least onSaveInstanceState is called. So, reference to a UI element in activity or fragment prevents the element from being collected - right ?</p>
  
  <p>Am I wrong or should I stick to findViewById or try weakreferences ?</p>
  
  <p>Thanks.</p>