Application components are the essential building blocks of Android app development. Each component is an entry point through which the system or a user can enter your app. There are 4 types of components in android Activities Services Broadcast receivers Content providers Let's dive into the deep. Activities This is a component that represents a single screen with a user interface or simply an entry point for interacting with the user. Example, an email app might have one activity that shows a list of new emails. Activities work together to form a cohesive user experience in the app. For example, clicking a button on the first screen might replace that screen with another screen containing other widgets, a web page, a movie, or text information. Activities are typically created by subclassing (extending) the Android class Activity. click here to know more about Activity. Services This runs in the background to perform work for remote processes or
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