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FullScreendy

Fullscreen kiosk browser for wall tablets, tied into FHEM over MQTT
New in version 0.4.12
• The WebView no longer talks to Google. Android enables Safe Browsing in every WebView by default, which reports each page address to Google; that is now switched off, together with the WebView usage metrics. Out of the box the app only connects to your dashboard and your MQTT broker.
• Store description: the "All files access" line was wrong since 0.4.10 and now describes the folder picker.
FullScreendy turns an Android tablet into a fullscreen kiosk display for a smart-home dashboard — and makes the tablet itself a device in FHEM over MQTT.

Dashboards
Up to three dashboards, each with its own name, URL, login (HTTP Basic Auth) and certificate setting, so different servers can be mixed. One of them is the default dashboard: it is shown at start and again every time the screen wakes up. The side menu lists them all for switching, and MQTT can switch them too.

The tablet as an FHEM device
Battery level, charging state and temperature, screen state, brightness and volume are reported over MQTT. Incoming commands let FHEM speak text through the tablet, play stored sound files, switch the screen on and off, change brightness and volume, load another URL, reload, clear the cache or vibrate. Everything runs in a persistent foreground service that reconnects to the broker on its own.

Presence and screen
Camera motion detection wakes the display — the image never leaves the device, only a motion flag is published. Instead of letting Android turn the screen off, the app dims it to black with an overlay, so camera and microphone keep running and a touch wakes it instantly, without a wallpaper flash. Optionally the screen can be turned off completely after an even longer idle time.

Voice control in the dashboard
The page can be granted microphone access for speech recognition, and a small JavaScript bridge (window.fullscreendy.textToSpeech) provides speech output, which Android's WebView itself cannot do.

Built for 24/7 operation
Periodic reload against WebView memory growth, memory released under pressure, and the display is brought back automatically if Android ever kills the app.

Why the app asks for these permissions
• Camera — motion detection only; no image is stored or transmitted.
• Microphone — either wake-on-sound (loudness only, no recording) or voice control in the dashboard. You choose which; both at once is impossible.
• Device admin — needed to lock the screen (cmd/lock and "turn screen off").
• Display over other apps — lets the service bring the dashboard back to the front after Android killed it for memory.
• Modify system settings — real hardware brightness over the full range.
• No storage permission at all: the sound folder is picked through the system folder picker, and the app is granted exactly that folder.

The app only talks to the dashboard and the MQTT broker you configure. The one exception is optional and off by default: if you turn on the update check, the About screen asks api.github.com whether a newer release exists. Nothing is downloaded or installed by the app itself.

Free software, MIT licensed. Interface in English and German.
  • app screenshot
  • app screenshot
  • app screenshot

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 0.4.12 (25) suggested Added on Oct 25, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 9.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • disable your screen lock
      Allows the app to disable the keylock and any associated password security. For example, the phone disables the keylock when receiving an incoming phone call, then re-enables the keylock when the call is finished.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "camera"
      Allows the app to make use of foreground services with the type "camera"
    • run foreground service with the type "dataSync"
      Allows the app to make use of foreground services with the type "dataSync"
    • run foreground service with the type "microphone"
      Allows the app to make use of foreground services with the type "microphone"
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • This app can appear on top of other apps
      This app can appear on top of other apps or other parts of the screen. This may interfere with normal app usage and change the way that other apps appear.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • modify system settings
      Allows the app to modify the system's settings data. Malicious apps may corrupt your system's configuration.
    • de.kewl.fullscreendy.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 3.8 MiB PGP Signature | Build Log

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