Requires iOS 4.0 or higher
Recent apps toggle like on Android OS. Android Recent Apps works as an Activator toggle so you will have multiple options for toggling it. Short Hold on the home button is recommended since it is the closest to the actual android method. Android Recent Apps displays up to 12 of your most recent apps, and allows you to easily launch them even if they are already closed.
Configure the activation method from Activator in Settings app