android-webview-kiosk/CLAUDE.md

android-webview-kiosk

Android TV app: fullscreen WebView kiosk. Multiple APK flavors built from webviews.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. Build toolchain: AGP 9.2.1, Gradle 9 (nixpkgs 26.05), build-tools 36, compileSdk 35, JDK 21.

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 dev shell sets GRADLE_OPTS to pass -Dorg.gradle.project.android.aapt2FromMavenOverride=<sdk aapt2>; Gradle turns org.gradle.project.* system props into project properties, which is what AGP reads. Works since nixpkgs 26.05 (PR #449037 merged post-25.11). No file rewriting; gradle.properties stays untouched.

Commands (user-run, from repo root, direnv activates devshell)

• Tests: gradle --no-daemon :app:test
• All APKs: gradle --no-daemon :app:assembleRelease → app/build/outputs/apk/<flavor>/release/<flavor>-release.apk
• Single APK: gradle --no-daemon :app:assembleWeatherRelease
• Connect ADB: tv-connect (uses $TV_IP from .envrc)
• Sideload: tv-install <flavor> e.g. tv-install weather (bump versionCode in app/build.gradle.kts first for upgrades)
• Fresh install: adb uninstall cz.c3c.webviewkiosk.<flavor> && tv-install <flavor>

Key facts

• Package/applicationId: cz.c3c.webviewkiosk; repo name keeps the android- prefix, the package can't (hyphens illegal).
• Webview URL + label configured in webviews.yaml (repo root). Each entry becomes a product flavor with applicationIdSuffix = ".<name>"; BuildConfig.WEBVIEW_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 URIs (from getApplicationList) are per-flavor, e.g. weather: com.sony.dtv.cz.c3c.webviewkiosk.weather.cz.c3c.webviewkiosk.weather.MainActivity
• setActiveApp alone wakes the TV from standby — no separate setPowerStatus call needed. Control4 driver can skip the wake step.