how can i cancel the default action if user set my action as default in my app?

how can i cancel the default acti开发者_如何学运维on if user set my action as default in my app?

Easy. Go to Settings -> Applications -> Manage Applications.

Find the app that was set to default (For example, Google Maps or Youtube or ADWLauncher) and click it.

Near the bottom of the list you'll see Launch By Default. Click the Clear default button.