There's no distinction between "tasks" and "views" in Android. Everything is just an activity. When you press back it takes you to the previous activity you w

There's no distinction between "tasks" and "views" in Android. Everything is just an activity. When you press back it takes you to the previous activity you were on. When you launch an application you're really just launching the default activity for a given package. The home screen is itself an activity. This also allows you to launch in the middle of an application, to a specific screen, etc. It's better to think about activities as URLs. The back button on Android behaves the same as the back button on your browser.