![]() ![]() Implement a basic UI for the Activity in an XML layout file.Create a class that inherits from the AppCompatActivity or Activity.To implement an Activity in your app, do the following: The activity is notified of each state by the system using life cycle methods.The system maintains the previous activity state. Each time a new activity is started, the previous activity is stopped and put in a back stack.This is the Activity that is started by Android. ![]() In an app, they should be one Activity designated as the main activity.Your app is made up of a collection of activities that you create yourself, or that you reuse from other apps. An email app for example might contain several Activities: ActivitiesĪn activity represents a single screen in your app with an interface the user can interact with. You also learn about using an Intent to communicate from one activity to another. In this chapter you learn about the Activity class, the major building block of your app's user interface (UI). Starting activities with explicit intentsīack navigation, tasks and the back stack ![]() Associate the activity with the layout file ![]()
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