Refactor, Modernize & Enhance Android Camera Samples with new features

[madebymozart]

Overview

The legacy camera-samples repo was a loose collection of ~12 independent Gradle projects
(CameraXBasic, Camera2Basic, CameraXAdvanced, …), each with its own build, largely View-based
UI, and copy-pasted boilerplate. This PR replaces all of them with a single, modern, Compose-first
Camera Samples Catalog app — one cohesive application that showcases Camera2 and CameraX
through small, self-contained samples that share a common architecture and design system.

783 files changed · +14.9k / −32.7k

Screenshots

   

Highlights

• One app, one build. A single Gradle project replaces the dozen standalone sample projects; a
  filterable catalog on the home screen routes to each sample.
• Modular architecture. Shared code lives in :core-theme, :core-camera, and :core-ui, with
  one thin library module per sample under :samples/{api}-{feature}.
• Layered & unidirectional. Every sample follows the same UiState → ViewModel → Controller → Screen pattern (documented in android_architecture.md) — a
  sealed interface Ui state, a @HiltViewModel exposing one StateFlow, a @Stable controller
  that owns the camera lifecycle, and a Screen that renders with when(state).
• "Console" design system. A violet accent, Space Grotesk + Space Mono typography, a dense
  2-column catalog, a viewfinder HUD (accent focus reticle, rule-of-thirds, torch glow), and
  console-styled in-app settings menus.
• createSample generator. ./gradlew createSample -PsampleName=… -PscreenName=… scaffolds a
  working, preview-only module and wires it into the build + catalog automatically.
• Modern toolchain. compileSdk 37 (Android 17), JDK 17, Jetpack Compose + Material 3, Hilt,
  Navigation-Compose. Formatting is enforced with Spotless (ktlint + Apache license headers).
• Modernized CI. The old per-project job matrix is replaced by a single root build that runs
  spotlessCheck + assembleDebug.

Samples

Each feature ships as a CameraX and/or Camera2 variant.

Sample	API	What it shows
Take a Photo	CameraX / Camera2	Preview, tap-to-focus, capture a still
Take a Video	CameraX (Recorder) / Camera2 (MediaRecorder)	Record video to DCIM/Camera
Slow Motion	Camera2	High-speed (constrained) recording
QR Scanner	CameraX + ML Kit	Real-time barcode/QR detection with overlay
Image Labeling	CameraX + ML Kit	On-device labels via ImageAnalysis
Extensions	CameraX / Camera2	Night / Bokeh / HDR / Face Retouch / Auto
Viewfinder Effects	Camera2	Real-time frame processing on the live preview
Zoom & Torch	CameraX / Camera2	Zoom-ratio slider + torch toggle
Exposure	CameraX	Exposure-compensation slider
Manual Controls	Camera2	Manual ISO / shutter / focus distance

Samples that depend on optional hardware (extensions, high-speed recording, manual sensor) detect
support at runtime and show a friendly "not supported on this device" state instead of crashing.

Module layout

app/                       catalog UI + Navigation-Compose NavHost
core-theme/                design system: color scheme, typography, AISampleCatalogTheme
core-camera/               Camera2/CameraX plumbing: controllers, previews, permissions, MediaStore
core-ui/                   shared Compose chrome: scaffold, controls, viewfinder HUD, capture review
samples/{api}-{feature}/   one library module per sample

Breaking changes

Removes the legacy standalone projects — Camera2Basic, Camera2Extensions, Camera2Video,
Camera2SlowMotion, CameraXBasic, CameraXAdvanced, CameraXExtensions, CameraXVideo,
CameraX-MLKit, HdrViewfinder, CameraUtils, and Presentations. Their functionality is
re-implemented and consolidated in the new catalog app.

Testing

• ./gradlew assembleDebug and ./gradlew spotlessCheck pass from the project root.
• Installed and smoke-tested on a Pixel 10 Pro (Android 17) and the Pixel 9 Pro XL emulator.

[gemini-code-assist]

Code Review

This pull request performs a major cleanup of the repository by deleting several camera-related sample applications, including Camera2Basic, Camera2Extensions, Camera2SlowMotion, Camera2Video, CameraX-MLKit, and CameraX-TFLite, along with their associated source code, resources, and utility modules. Additionally, it updates the .editorconfig file with ktlint naming rules for Composable functions and modifies the CODEOWNERS file to assign new owners. There are no review comments to assess, and I have no additional feedback to provide.

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