Explain the different navigation types, Android

I've been setting up an app for awhile now and now that I know exactly what I'm doing, I'm ready to pretty much restart and make a new version that's more user-friendly. While creating the app, Eclipse want to know what navigation type I want. ``` None Tabs Tabs+Swipe Swipe View+Title Strip Dropdown ``` Can somebody either explain (or give a link to something that explains) what the bottom four options look like and how to use them? So far all I've used is the 'none' option and I simply used buttons and a menu to navigate. I'd like to learn about the other options to make my app as sleek as possible. --This part was answered: http://android-er.blogspot.com/2012/06/various-navigation-type-provided-in-new.html But the 2nd part of this question: Is is possible to have one navigation at one point in time and another type of navigation at a different time? Example: Start-splash screen, go to login screen. Once logged in, go to a menu. If they pick 'edit forms', it brings them to a `Swipe Views + Title Strip` setup where each different view is a different form.