BlackBerry. How do you know that the application is launched for the first time after installation?

How do you know that the application is launched for the first time after installation?

And how to 开发者_开发百科do what the code for the application uninstall?

You have to store a value in the PersistentStore. When getting the value for the first time from it you will obtain a null value, meaning that the application is launched for the first time. So you do your work and then save a value into the persistentObject to avoid getting null again. And that's it