Lesson 0.9: Android app life from onCreate to onDestroy – what happens when we start app (and what are “activities”)
Android apps are built from activities. Activity is a set of actions visible on the screen (usually it takes whole screen, but it could be in a window). The app could have many activities. For instance a music player has a main menu activity, album list activity, song play activity etc. So activity is a combination of user interface and some functions.