When we consider the application components there are fundamental structure squares of an Android application. These parts are approximately coupled by the application show document AndroidManifest.xml that depicts every part of the application and how they interface.
Now we are try to learn about the activity
An activity addresses a single screen with a UI. For instance, an email application might have one activity that shows a rundown of new messages, another activity to create an email, what's more, one for understanding messages. Assuming an application has more than one activity, one of them ought to be set apart as the activity that is introduced when the application is dispatched.
Here the sample of Activity Class :
public class MainActivity extends Activity{
}
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