While Android Studio includes an emulator for testing apps on virtual devices, it’s not considered a core component of the IDE itself. It’s a separate tool that comes bundled with Android Studio for testing apps.

The AVD Manager in Android Studio is used to create and manage virtual devices on which Android apps can be tested. It allows developers to emulate various device configurations for testing purposes.

Gradle is a build automation tool that manages project dependencies and builds projects in Android Studio. It’s essential for compiling code, managing dependencies, and generating APKs.

ConstraintLayout is a flexible layout manager in Android Studio that allows developers to create complex layouts while maintaining a flat view hierarchy. It helps in reducing the nesting of views and improves layout performance.

XML files are commonly used in Android Studio projects for defining UI layouts using the XML markup language. These files are located in the “res/layout” directory of the project.

The startActivityForResult() method is used to start a new activity and receive a result back. The result is returned in the onActivityResult() callback method.

The Layout Inspector tool in Android Studio allows developers to inspect and analyze the layout hierarchy of an app’s UI. It provides insights into how UI elements are arranged and rendered on the screen.

The Build Variants tool in Android Studio allows developers to configure different build types (e.g., debug, release) and product flavors (e.g., free version, paid version) for their app, enabling them to build multiple versions of the app from a single codebase.

An Intent is a messaging object used to request an action from another app component, such as starting an activity or service, or delivering a broadcast.

The Toast.makeText() method is used to create a Toast message. It requires the application context, the message, and the duration as parameters. To display the toast, you call the show() method on the resulting Toast object.

Logcat is a tool in Android Studio that displays system and app log messages. It’s primarily used for debugging purposes, allowing developers to monitor system and app messages during app development and testing.

The @Override annotation indicates that a method is intended to override a method in a superclass. It helps to catch errors if the method does not correctly override a method from the superclass.

The startActivity() method is used to start a new activity in an Android app. It takes an Intent as a parameter, which specifies the activity to be launched.

The SDK Manager in Android Studio allows developers to manage SDK packages, including installing, updating, and deleting SDK components such as platforms, tools, and system images.

SharedPreferences is a class in Android used to persist simple key-value pairs of data across application restarts. It is commonly used for storing user preferences and settings.

RecyclerView is a flexible view used for displaying large sets of data in a scrollable list. It is more efficient than ListView because it reuses item views, reducing the need for new views to be created.

A ViewModel is designed to store and manage UI-related data in a lifecycle-conscious way. It survives configuration changes such as screen rotations, ensuring that data is not lost during these changes.

The Profiler tool in Android Studio allows developers to analyze various aspects of app performance, including CPU usage, memory allocation, and network activity. It helps in identifying performance bottlenecks and optimizing app performance.

While Kotlin is increasingly popular, Java has been the traditional language for Android app development. Android Studio fully supports both Java and Kotlin.