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private static final boolean isA = UUID.randomUUID().getLeastSignificantBits() % 2 == 0;

@Override
public void onCreate(...) {
   super.onCreate(saved...);

   if(!isA) {
      setContentView(R.layout.mainA);
      MyApp.getInstance().tracker().trackPageView("/AUser");
   } else {
      setContentView(R.layout.mainB);
      MyApp.getInstance().tracker().trackPageView("/BUser");
   }

   ...
}