Multiple activities called on single button click causing screen flashing/blinking

Multiple activities called on single button click causing screen
flashing/blinking

I am new to android. Please help me working with multiple activities.
I am working on an SMS problem where I have to click on a button which
will start an activity. This activity is just handling some checks and
doing some work in background.
In my case, it is fetching the user's address and checking the attachments
(for a MMS). After that it starts another activity which displays a UI in
my case a dialogue to the user for entering the recipients
The problem is when I click on the button in first screen, it blinks and
starts the intermediate activity does something in background and starts
another activity which displays the dialog.
I dont want any UI blinking appearing to the user, and I cannot skip the
intermediate activity
How can i call the third activity to appear on button click on first
screen without any screen blinking/flashing
Any help would be apprectaied