![]() There is a sequence of callback methods that start up an activity and a sequence of callback methods that tear down an activity as shown in the below Activity life cycle diagram: ( image courtesy : ) Very similar way, Android system initiates its program with in an Activity starting with a call on onCreate() callback method. If you have worked with C, C++ or Java programming language then you must have seen that your program starts from main() function. An activity represents a single screen with a user interface just like window or frame of Java.Android activity is the subclass of ContextThemeWrapper class.
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