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feat: multi-flavor APK build from dashboards.yaml

Dashboard URL and label configured in dashboards.yaml; each entry
becomes a product flavor with BuildConfig.DASHBOARD_URL injected
at build time. APKs output as <flavor>-release.apk.

2026-06-12 18:15:21 +02:00

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android-webview-kiosk

Android TV app: fullscreen WebView showing a configurable Grafana dashboard. Multiple APK flavors built from dashboards.yaml (repo root) — one APK per entry. Runs on the living-room Sony Bravia KD-65XE9305 (Android 8.0, API 26; Android System WebView updates independently via Play Store — currently v138). Launched remotely through the Bravia REST IP-control API by Control4 (driver lives in a separate project). See README.md for the API sequence.

Lab project — with deviations

This is a lab project (lab skill conventions apply) EXCEPT:

No container image, no helm chart, no /livez//readyz — artifact is an APK.
No nix build: gradle needs network for Maven deps. The flake is a dev shell only. All builds run as nix develop --command gradle ....
Agents cannot run nix/gradle/adb here — ask the user to run commands and report output.

NixOS aapt2 workaround

AGP cannot run the Maven-downloaded aapt2 on NixOS (dynamically linked generic Linux binary). The nix shellHook rewrites the android.aapt2FromMavenOverride line in gradle.properties to point at the SDK's nix-patched aapt2 on every nix develop. The sentinel value __NIX_SHELLHOOK_SETS_THIS__ is what's tracked in git; the shellHook replaces it before any gradle command runs.

Commands (user-run, from repo root)

Tests: nix develop --command gradle --no-daemon :app:testWeatherReleaseUnitTest
All APKs: nix develop --command gradle --no-daemon :app:assembleRelease → app/build/outputs/apk/<flavor>/release/<flavor>-release.apk
Single APK: nix develop --command gradle --no-daemon :app:assembleWeatherRelease
Sideload: adb connect <tv-ip>:5555 && adb install -r <apk> (bump versionCode in app/build.gradle.kts first for upgrades)
Fresh install: adb uninstall cz.c3c.webviewkiosk && adb install <apk>

Key facts

Package/applicationId: cz.c3c.webviewkiosk; repo name keeps the android- prefix, the package can't (hyphens illegal).
Dashboard URL + label configured in dashboards.yaml (repo root). Each entry becomes a product flavor; BuildConfig.DASHBOARD_URL is injected at build time. Changing a URL means editing the YAML, rebuilding, resideloading. Intentional: keeps Control4 integration to a single parameterless launch call.
signing/release.keystore is committed on purpose (private repo, LAN-only kiosk) so every build is upgrade-compatible. Don't reuse the key.
minSdk 26 is a hard floor — the TV never gets newer Android.
LEANBACK_LAUNCHER category + android:banner are what make the app visible to the Bravia API's getApplicationList/setActiveApp. Don't remove either.
App URI (from getApplicationList): com.sony.dtv.cz.c3c.webviewkiosk.cz.c3c.webviewkiosk.MainActivity
setActiveApp alone wakes the TV from standby — no separate setPowerStatus call needed. Control4 driver can skip the wake step.