JNTU B.Tech IV MOBILE APPLICATION DEVELOPMENT Previous Question Paper (July/August - 2022 - R18)

To install and run an application in Android Studio, follow these structured steps:

• Project Setup: Open Android Studio, select 'Start a new Android Studio project', choose a template (e.g., 'Empty Activity'), and configure the project name, package name, and language (Java or Kotlin).
• Build Configuration: Android Studio uses the Gradle build system. Ensure the build.gradle files are synced correctly to resolve dependencies.
• Virtual Device Setup: Navigate to the AVD Manager (Android Virtual Device). Click 'Create Virtual Device', select a hardware profile (e.g., Pixel 4), choose a system image (API level), and finish the configuration.
• Execution: Click the green 'Run' icon (play button) in the top toolbar. Select the target device (the AVD created or a physical device connected via USB with USB Debugging enabled in Developer Options).
• Deployment: Android Studio compiles the source code into an APK (Android Package), signs it with a debug key, installs it on the selected device, and launches the activity.

The Android development framework is structured as a layered stack, providing a comprehensive environment for application development:

• Linux Kernel: The foundation of the OS, providing hardware abstraction, memory management, process management, and security. It includes drivers for display, camera, and Wi-Fi.
• Hardware Abstraction Layer (HAL): Provides standard interfaces that expose hardware capabilities to the higher-level Java API framework.
• Android Runtime (ART): Replaces the older Dalvik VM. It uses Ahead-of-Time (AOT) compilation to convert bytecode into machine code during installation, enhancing performance and battery life.
• Native C/C++ Libraries: Includes core libraries like SQLite for database management, OpenGL for graphics, and WebKit for web browsing, which are accessed via the Java framework.
• Java API Framework: The set of APIs developers interact with directly. It includes components like:
  • Activity Manager: Manages the lifecycle of applications.
  • Content Providers: Facilitates data sharing between apps.
  • View System: Handles UI components like buttons and layouts.
  • Resource Manager: Manages non-code resources like strings and images.
• System Apps: The top layer consisting of pre-installed applications like the Dialer, SMS, and Browser, which run on top of the framework.