Alby96andClaude Opus 5
4142b67a8d
Hiding the NDK and rebuilding showed the build fails without it, and the reason is not obvious from this repository: maplibre_gl pins ndkVersion 28.2.13676358 in its own build file, and AGP needs every module to agree on one NDK. The app has no native sources and no Dart FFI, so the declaration reads like dead configuration and invites exactly the deletion that was just tried. Costs about 2 GB of Android SDK. Notes the full toolchain disk budget in the README as well, since a warm Gradle cache plus build output pushes the total to roughly 14 GB. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Nuvolari
Precipitation radar for Piedmont, Italy. Android first, iOS later, one Flutter codebase.
Radar imagery comes from the public Radar-DPC platform, forecasts from MET Norway, weather alerts from the ARPA Piemonte XML-CAP bulletin. The app is free and ad-supported, with GDPR consent through Google's UMP.
Nuvolari is an independent app. It is not affiliated with, endorsed by, or operated by ARPA Piemonte or the Dipartimento della Protezione Civile. For civil-protection purposes the official channels always prevail.
Layout
app/ Flutter application (Dart package "nuvolari")
backend/ Python worker: fetches DPC rasters, crops, reprojects, renders PNG frames
docs/ architecture, data sources, licenses, stack decisions, roadmap, privacy
tool/ verification scripts
Start with docs/architecture.md, then docs/roadmap.md for what is built and what is next.
Toolchain
| Tool | Version |
|---|---|
| Flutter | 3.47.3 stable (Dart 3.13.3) |
| Android SDK | platform 36, build-tools 36.0.0, platform-tools |
| JDK | 21 |
| Python | 3.12+ (3.14 works; rasterio ships wheels for it) |
| Android NDK | 28.2.13676358 — pinned by maplibre_gl, not by this project |
A full toolchain plus a warm Gradle cache needs roughly 14 GB of disk: Flutter
3 GB, Android SDK 2.5 GB (2 GB of which is the NDK the map plugin pins), the Gradle
cache 5 GB, and build output around 2 GB. flutter clean reclaims the last of those.
Configuration
Secrets never enter the repository. Copy the template and fill it in:
cp env.example.json env.json # env.json is git-ignored
| Key | Purpose |
|---|---|
MAP_STYLE_URL |
MapLibre style URL. Empty falls back to a local offline style. |
RADAR_MANIFEST_URL |
Base URL of the published manifest.json. |
RADAR_SOURCE |
mock (offline demo), dpc (live), arpa (disabled stub). |
METNO_USER_AGENT_CONTACT |
Contact address for the MET Norway User-Agent — mandatory for forecasts. |
ADMOB_APP_ID, ADMOB_BANNER_UNIT_ID |
Empty means Google's test ad units are used. |
Running
cd app
flutter run --dart-define-from-file=../env.json
With no env.json the app starts in demo mode: mock radar frames from assets, offline
base map style, test ad units. No network and no credentials required.
Verifying
.\tool\verify.ps1 # format, analyze, test, build, lint, pytest
.\tool\verify.ps1 -SkipBuild # fast inner loop
Stages whose target does not exist yet are skipped, so this runs from day one.
Attribution
Radar-DPC (CC BY-SA) · MET Norway (CC BY 4.0) · Arpa Piemonte · © OpenStreetMap contributors (ODbL). See docs/licenses.md for the obligations these carry — in particular, the rendered radar frames are a derived product of CC BY-SA data and inherit share-alike.