How can I refresh my screen or run initial process in background

My main screen has a process which can take 20-30 seconds to load the information on to the screen. While this is happening the screen is just black. I have tried using a ProgressDialog to let the user know the process is running but as the screen is bl开发者_运维百科ack you cannot see it. Can I refresh the screen so that the dialog is visible or do I need to run my initial process in background so that the screen is visible?

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Anything that takes over ~200ms should be run as a background task. You can either use an AsyncTask or a Thread/Handler combination.

• AsyncTask
• Painless threading
• Threading
• Designing for responsiveness
• Thread documentation
• Handler documentation