Adds a quick settings tile 💡 to turn the frontlight on or off on Onyx BOOX E-readers running Android 9+.

When you long tap this new quick settings tile, you can set warmth and brightness independently, instead of having to manually combine warm brightness with cold brightness.

Alternatively, set Gentle Glow as a floating navigation ball button to always have it at your fingertips. You now have a light switch inside the dialog, so you never have pull down quick settings for this if you don't want to.

⚠️With this app, you have finer control over the frontlight than with the native sliders. Most of the time, the native controls will show the lights are toggled on, but the cold / warm sliders will stay at zero, because the setting is not one of their fixed increments.

In the warmth & brightness dialog, you get to choose between three configurations.
Initially, you get three presets:
* Night, to be used in a dark bedroom.
* Dawn, to be used at first daylight, before sunrise
* Day, to be used at day time indoors or in the shade

You can easily adjust the brightness or warmth on any of the three configurations. Just play with the sliders or with the fine tune buttons to the left and right of the sliders, and your changes are auto-saved.

Should you use the frontlight under any completely different circumstance, say on the subway, you can easily rename any of these three configurations to Subway and fine tune the warmth and brightness to your daily commute needs.
At any time, you can go back to any of the presets.

The Onyx Slider configuration is there just so changing the frontlight settings via the system sliders doesn't silently change your current configuration.

The Onyx Slider configuration is also a good way to get your system sliders back to a known good state, see the warning above.

⚠️I am in no way affiliated with Onyx.

If you like this app, here is how you can help:
* let me know how you use the app - which warmth / brightness settings you use, at what times of the day.
* put any negative feedback in an issue at https://github.com/calin-darie/gentle-glow-onyx-boox/issues and give me a couple weeks to answer before you rate on Google Play. I'm doing this in my free time.
* tell your friends about it!
* rate 5 stars
* contribute to the open source project at https://github.com/calin-darie/gentle-glow-onyx-boox