Activities

• When an activity is started, it is added to a “back-stackâ€� and takes focus

• If the user launches another activity from the current one, it is halted but its state is preserved in the back-stack

• Activities are notified when they are being halted or paused and can act accordingly

• When a user hits the back button, the current activity is removed from the back-stack, destroyed and the previous activity resumes