12.4 The Android Lifecycle Methods
As previously explained, the Activity and Fragment classes contain a number of lifecycle methods which act as event handlers when the state of an instance changes. The primary methods supported by the Android Activity and Fragment class are as follows:
•onCreate(Bundle savedInstanceState) – The method that is called when the activity is first created and the ideal location for most initialization tasks to be performed. The method is passed an argument in the form of a Bundle object that may contain dynamic state information (typically relating to the state of the user interface) from a prior invocation of the activity.
•onRestart() – Called when the activity is about to restart after having previously been stopped by the runtime system.
•onStart() – Always called immediately after the call to the onCreate() or onRestart() methods, this method indicates to the activity that it is about to become visible...
