# pad_scanner CLAUDE.md

## App Installation Rules

**Always use `adb install -r` to install the app. Never use `flutter install`.**

`flutter install` uninstalls the old version first, which wipes app configuration (API URL, sound file paths, etc.). `adb install -r` performs an in-place upgrade that preserves all app data.

### Installation Steps

```bash
# 1. Build
flutter build apk --release

# 2. Install (in-place upgrade, preserves config)
adb install -r build/app/outputs/flutter-apk/app-release.apk
```