android-webview-kiosk

Fullscreen WebView kiosk for Android TV. Shows the house Grafana dashboard: https://grafana.c3c.cz/public-dashboards/381fe3e71e164eb99dd0b10e246a36e2

Target device: Sony Bravia KD-65XE9305 (Android 8.0). Built for remote launch via the Bravia REST IP-control API, driven by Control4.

Build

nix develop --command gradle --no-daemon :app:assembleRelease

APK: app/build/outputs/apk/release/app-release.apk

Sideload

1. TV one-time: Settings → About → press Build 7× → Developer options → enable ADB debugging.
2. adb connect <tv-ip>:5555
3. adb install -r app/build/outputs/apk/release/app-release.apk

Upgrades: bump versionCode in app/build.gradle.kts, rebuild, reinstall with -r. Same committed keystore = no uninstall needed.

Remote launch (Sony Bravia IP control)

TV prerequisite: IP control auth = "Normal and Pre-Shared Key", Remote start enabled (wake from deep standby).

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 is needed. The Control4 driver can use a single call:

curl -s -X POST http://$TV_IP/sony/appControl \
  -H "X-Auth-PSK: $PSK" -H 'Content-Type: application/json' \
  -d '{"method":"setActiveApp","id":601,"version":"1.0","params":[{"uri":"com.sony.dtv.cz.c3c.webviewkiosk.cz.c3c.webviewkiosk.MainActivity"}]}'

If the TV is already on, setActiveApp brings the kiosk to the foreground. If in standby, it wakes and launches directly.

For reference, the two-step sequence (if needed for other integrations):

# 1. wake (optional — setActiveApp does this implicitly)
curl -s -X POST http://$TV_IP/sony/system \
  -H "X-Auth-PSK: $PSK" -H 'Content-Type: application/json' \
  -d '{"method":"setPowerStatus","id":55,"version":"1.0","params":[{"status":true}]}'

# 2. launch (~6 s from quick standby, up to ~30 s from deep eco standby)
curl -s -X POST http://$TV_IP/sony/appControl \
  -H "X-Auth-PSK: $PSK" -H 'Content-Type: application/json' \
  -d '{"method":"setActiveApp","id":601,"version":"1.0","params":[{"uri":"com.sony.dtv.cz.c3c.webviewkiosk.cz.c3c.webviewkiosk.MainActivity"}]}'

Control4: a DriverWorks driver issuing setActiveApp is a separate project.