How to launch an application from a contact in Android?

I would like to write an application which would be launched from the Contacts list in the phone. That is, you choose a contact using the normal contacts application, and where you can dial to the contact, send an Email or SMS, you can also launch my application with this contact's activity. How can this be done?

How do I launch a contact application?

From the Home screen, tap the Contacts icon (in the QuickTap bar). You can also tap the Contacts tab (at the top of the screen) from the Phone app.

With the default Android source Contact application you can't do it.

If the phone has some other 3rd party Contact's application, and that has a way to be extended by plugins, you can write this plugin to respond by openning your application.