You can issue commands to install and debug apps, as well as run a variety of commands on a device. adb (Android Debug Bridge)Īdb, or Android Debug Bridge, is a versatile command-line tool that lets you communicate with an Android device. It was introduced in the Android O release, and is intended to make all the app icons have a uniform shape on a device. Adaptive iconsĪdaptive icons is an app icon format for Android apps which can display a variety of shapes across different device models. Making your app more accessible leads to an overall better user experience, which benefits all your users. It also means that your app will work well with assistive technologies such as the Talkback screen reader. In the context of this course, accessibility refers to the design and functionality of your app, so that it is easier for more people, including those with disabilities, to use. Because of this, you cannot instantiate an abstract class directly Accessibility In that case, initializing the abstract property or implementing the abstract method is up to the subclasses. An abstract class may have properties or methods that have not been implemented yet. See the Kotlin Language Documentation for full reference.Īn abstract class is a class that is marked with the abstract keyword in Kotlin.

See the Kotlin Quick Guide for Android Basics in Kotlin for concepts in this course in code.This vocabulary list explains the terminology used in the Android Basics in Kotlin course.

Kotlin programming