Camera

A minimal Android camera app built with Jetpack Compose and CameraX.

Features

• Live camera preview with pinch-to-zoom and tap-to-focus
• Photo capture and save to gallery (MediaStore)
• Front/back camera switching
• Flash mode cycling (off, auto, on)
• Exposure compensation
• Animated focus indicator

Requirements

• JDK 17
• Android Studio Ladybug or later (AGP 9.3.1)
• Android SDK 36 (compileSdk / targetSdk)
• Min SDK 26 (Android 8.0)

Build & Run

# Debug build
./gradlew assembleDebug

# Install on connected device
./gradlew installDebug

Or open the project in Android Studio and run directly.

Permissions

The app requests CAMERA and READ_MEDIA_IMAGES at runtime on launch. Denying camera permission will prevent the preview from loading.

Project Structure

app/src/main/java/tech/jptr/camera/
├── CameraApp.kt              # Application class
├── MainActivity.kt           # Single activity
├── camera/
│   ├── CameraController.kt   # ProcessCameraProvider wrapper
│   ├── CameraState.kt        # ViewModel + state data class
│   ├── PhotoSaver.kt         # MediaStore JPEG save
│   └── UseCases.kt           # CameraX use case factories
├── ui/
│   ├── CameraScreen.kt       # Main composable orchestrator
│   ├── ControlsOverlay.kt    # Shutter, switch, flash buttons
│   ├── FocusIndicator.kt     # Animated focus ring
│   ├── Viewfinder.kt         # CameraXViewfinder wrapper
│   └── theme/                # Material 3 theme + colors
└── util/
    ├── Extensions.kt         # Custom IconButton / ShutterButton
    └── ImageUtils.kt         # YUV-to-Bitmap, rotation, scaling

Tech Stack

• Kotlin 2.3.0
• Jetpack Compose with Material 3
• CameraX 1.6.1
• KSP (annotation processing)
• Coroutines