Be able to turn off the screen

[M4XGO]

I’m currently developing a solution to manage content displayed on a TV screen through a web-based application.
To provide a seamless experience, I need a way for the browser to control basic screen power actions — specifically turning the TV display on or off.
Right now, no browser functionality allows this, which limits what I can do from a purely web-based environment.

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I would like the browser to expose a simple API or capability to toggle the display power state (turn the screen on or off).
A minimal implementation could be:
• a JavaScript API
• or an extension/setting allowing the browser to issue display power commands
• or support for device-specific power management if available (HDMI-CEC, DPMS, etc.)

I’m also open to contributing and helping implement this feature if it’s considered feasible.

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The goal is to control TV screens remotely and programmatically, without relying on native apps or external hardware controllers.
This would enable web dashboards or digital signage solutions to manage screen power directly from the browser.
Happy to provide more details about my setup or use case if needed 🙂

[truefedex]

If you want to instantly turn the screen on/off on demand, then it's impossible to do so on Android without additional system permissions (such as permission.DEVICE_POWER), if I'm not mistaken. And if I'm not mistaken app should be installed in some special way to take that system permissions. Probably root needed. And I certainly wouldn't add such a feature, controlled by arbitrary websites, to the main app branch, as it would be useless and even harmful for most users. And with that permissions, TV Bro likely wouldn't have been approved for the Google Play at this days. So, if you need this, you should either write your own wrapper over WebView (it's not difficult today) or fork TV Bro. If you go the latter route, you'll can add this capability to com.phlox.tvwebbrowser.webengine.webview.AndroidJSInterface class - just additional @JavascriptInterface marked method and it will be accessible by JS side.

It's a different matter if you simply need to allow the screen to turn off at a certain point using the standard system timeout. Currently, TV Bro keeps the screen on (with permission-less WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON APIs) only if the corresponding option is selected in the settings (permanently, until user leave the main activity) or if a website requests full-screen mode (until exiting this mode). So, you can simply request fullscreen mode (e.g. by Element.requestFullscreen()) to keep the screen on, and then exit this mode when you no longer need it.