QUESTION 3

(a) What is the purpose of the Back Stack? Highlight the importance of effective implementation of it, with reference to either a Music or email application as an example.

(b) In the context of the Activity Life Cycle, and with the aid of a diagram, explain the following under the headings of role, location, and important characteristics:

(i) onDestroy()

(ii) onStart()

(iii) onResume()