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Activity might be one of the single most important concepts in Android development. At its simplest, an Activity represents a screen in an application. And because of Android's application architecture, which doesn't have a single application instance, an Application is an agreggation of one or more activities.

Activity Basics

Xamarin Workbook

If it's not already installed, install the Xamarin Workbooks app first. The workbook file should download automatically, but if it doesn't, just click to start the workbook download manually.