title: Unique id of an android activity
body: <p>I need to get an unique id of an android activity instance. I'd like to take the string which the activitymanager writes in the log (for example: ActivityManager: Activity pause timeout for HistoryRecord{<strong>450495a0</strong> ...}), but I don't know how to get it.</p>
  
  <p>Does someone know how I can get this string? Or is there another unique id for each activity instance?</p>