Android :: Activity Executing Code While Screen Is Black

I've a lot of initialization code in my main activity's onCreate(). When I launch my game, the screen goes black for a long time, then my game appears. I did logged some message at the start and end of onCreate() and found that onCreate() is executing its code while the screen is black. Sometimes the screen goes black for too long and phone shows a popup dialog prompting me to choose between Force close/Wait. Then when onCreate() is completed, my game appears. Choosing 'Wait' then dismiss the dialog.

I tried using progress dialog described in this article:

http://developer.android.com/guide/topics/ui/dialogs.html#ProgressDialog

But it doesn't work. The screen goes black for the same amount of time even after I use the progress dialog.