Android Components Showcase

A comprehensive Android project demonstrating core architectural components and modern development practices. This project serves as a practical guide for implementing Activities, Intents, Services, Broadcast Receivers, and WorkManager using Jetpack Compose.

Features & Modules

1. Intents (Explicit & Implicit)

Demonstrates how to communicate between components:

• Explicit Intent (Internal): Navigating between activities within the same app.
• Explicit Intent (External): Launching specific external applications (e.g., YouTube) using package names.
• Implicit Intent: Sharing content (text/email) by declaring an action and letting the system find suitable apps.

2. Services

Shows the different types of Android Services and their lifecycles:

• Foreground Service: Used for tasks the user is actively aware of (e.g., data sync). Includes notification management and API 26+ requirements.
• Background Service: Demonstrates independent background operations and discusses restrictions introduced in Android 8.0 (Oreo).

3. Broadcast Receivers

• Dynamic Registration: Implements an AirPlaneModeReceiver to listen for system-wide events (ACTION_AIRPLANE_MODE_CHANGED) at runtime.
• Best Practices: Includes proper registration in onCreate and unregistration in onDestroy to prevent memory leaks.

4. WorkManager (Photo Compression)

A real-world example of background processing:

• PhotoCompressionWorker: Uses CoroutineWorker to compress images shared from other apps.
• Constraints: Ensures tasks run only when storage is not low.
• Data Flow: Uses LiveData and ViewModel to observe worker status and display compressed results in the UI.

5. Modern UI & Tech Stack

• Jetpack Compose: Fully declarative UI built with Material 3.
• Coil: Efficient image loading for both URIs and Bitmaps.
• Architecture: Follows MVVM pattern using ViewModel and LiveData.
• Edge-to-Edge: Implements modern Android display standards.

Tech Stack

• Language: Kotlin
• UI Framework: Jetpack Compose
• Design System: Material 3
• Image Loading: Coil
• Background Work: WorkManager
• Dependency Management: Gradle Version Catalog (libs.versions.toml)

How it works: Photo Compression Example

1. Share an Image: Share an image from your gallery to this app.
2. Process: onNewIntent triggers the WorkManager.
3. Compress: PhotoCompressionWorker reduces the image size below 20KB in the background.
4. Display: The UI automatically updates to show the original and the compressed version once finished.

Learning Notes

Each component is heavily documented with code comments explaining:

• The "Why" behind specific implementations.
• API level differences (e.g., Android 13+ permission handling).
• Lifecycle management best practices.