Overriding Method onCreate of Class Activity

The onCreate method (Fig. 3.12)—which is auto-generated with lines 38–39 when you create the app’s project—is called by the system when an Activity is started. Method onCreate typically initializes the Activity’s instance variables and views. This method should be as simple as possible so that the app loads quickly. In fact, if the app takes longer than five seconds to load, the operating system will display an ANR (Application Not Responding) dialog—giving the user the option to forcibly terminate the app. You’ll learn how to prevent this problem in Chapter 8.