The application file and application components
The application file in an Android app is the AndroidManifest.xml file. This file describes the essential information about your application to the Android system, such as the package name, the application components, the permissions it requires, the version information, and the activities that comprise the application.
The application components are the building blocks of an Android application. There are four main types of application components in Android:
Activities: An activity is the visual representation of a user interface in an app. It provides a screen where users can interact with the app. An app may have multiple activities, and they can interact with each other to provide a seamless user experience.
Services: A service is a background process that runs in the background even when the app is not visible. It performs long-running operations or operations that don’t require a user interface, such as playing music or downloading data.
Broadcast Receivers: A broadcast receiver is a component that listens to system-wide broadcast announcements, such as when the battery is low, or the screen turns off. When a matching broadcast is received, the receiver can perform some action, such as displaying a notification. Content Providers: A content provider is a component that manages a shared set of app data that can be accessed by other applications. It provides an interface for other applications to read and write data, such as a contact list or a media library.
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