Start Activity 2 Start Activity 3 Navigate back Foreground activity Activity 3 Activity 1 Activity 2 Activity 3 Activity 2 Back Stack Activity 1 Activity 2 Activity 1 Activity 3 Activity 1 destroyed When the user presses the 12:45 Back button,the current activity is popped from the top of the stack and the previous activity resumes Refer to: http://developer.android.com/guide/components/tasks-and-back-stack.html 6 • When the user presses the Back button, the current activity is popped from the top of the stack and the previous activity resumes Refer to: http://developer.android.com/guide/components/tasks-and-back-stack.html