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MALE SPEAKER: You tap the launcher icon for your app, your app launches. Sounds easy, right? Whats happening behind the scenes is a little more involved. It turns out the activities in your app dont live in a vacuum, but instead exist as part of one or more tasks. Now, a task, in and of itself, isnt very complicated. Its simply a stack of activities. As you call start activity, that pushes a new activity onto the tasks back stack. The Back button reverses this, calling finish on the current activity, popping it from the stack, and taking the user back to where they were. Hence the name. This symmetric push-pop model also applies to fragments. When specifying a fragment transaction, you can call add to back stack to add the fragment transaction to the back stack. Then, when the user hits the Back button, instead of your activity being finished, the fragment transaction is reversed. Only when there are no more fragment transactions will the Back button finish your activity. Now, if
