I want to kill the background opened application, after i opened my XXX application

[Shakthi N]

I have created one app(XXX). After i opened my App, the other background running app should be kill(closed). any code?

I need this because, when soo many app are running at a same time, its take too much time to open. that's why i need to closed the opened background app...

How can I do so in code?