Opening dialog activity on creating another activity

I've got an activity, call it A, that when initially opened I would like to programmatically open a another dialog theme activity, B, over the top. The user would select some info from the dialog activity and return to activity A. When resuming to activity A at some later point the data set would be available, so the dialog would not need to be shown.

The problem is attempting to start the dialog activity from activity A's onResume or onCreate m开发者_如何学JAVAethods causes strange and undesirable behaviour. The task appears to kind of freezes for a good few seconds and then the dialog is displayed correctly, but activity A isn't shown behind.

Thanks Peter

check this:

http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/CustomDialogActivity.html

i think u should create activity as a dialog.then it helps

u can set style and theme for ur activity by this..