Android Activity Class
An Android activity is a self-standing component of an Android
application that can be started, stopped, paused, restarted, or
reclaimed depending on various events including user-initiated and
system-initiated ones [Ref. 4]. An Activity class is a special
Java class and every Android app must have at least one. It is the part of the
code where our app will start when it is launched by the user, and this also
handles any interaction with the user. But who or what is calling
onCreate!? The answer to this mystery is that Android itself calls onCreate in
response to the user clicking on the app icon to run the app [Ref. 1].
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