By Android Teacher on June 22nd, 2013 in Getting started, Java tags: Activity class, activity lifecycle, Android activity, Bundle, MainActivity, onCreate, onDestroy, onPause, onRestart, onResume, onStart, onStop, R.layout.main_activity, savedInstanceState, setContentView
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.
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