Add support for OnePlus' "Alert Slider"

Is your feature request related to a problem? Please describe.

When I toggle the do not disturb switch on my OnePlus (7T) phone, it is not being registered by the DnD sensor (because it uses a different ~API~ settings key).

Describe the solution you’d like

DnD should indicate the state of the alert slider on OnePlus devices (with maybe a setting to opt-out of the alert slider, if present)

Describe alternatives you’ve considered, if any

• You could toggle the Android DnD via Assistant, but that defeats the whole purpose of the hardware switch

Additional context

The global setting for the slider is three_Key_mode with it’s values being: 3 -> Ring == off 2 -> Vibrate == vibrate (~= priority_only?) 1 -> Silence == alarms_only

Basic sample:

contentResolver.query(Settings.Global.CONTENT_URI, null, null, null, null).use {
    it!!.moveToFirst()
    val res = try {
        Settings.Global.getInt(
            applicationContext.contentResolver,
            "three_Key_mode"
        )
    } catch (e: Settings.SettingNotFoundException) {
        findViewById<TextView>(R.id.txt).text = "No alert slider"
        return@use
    }
    findViewById<TextView>(R.id.txt).text = when (res) {
        1 -> "alarms_only"
        2 -> "vibrate"
        3 -> "off"
        else -> "unknown"
    }
}

[jpelgrom]

I also don’t have a OnePlus device, but this does sound very similar to the AudioManager.getRingerMode() which is already available as the “Ringer Mode” sensor.

@cromefire Did you check this sensor to see if it responds to the alert slider?

[cromefire]

Yes this works indeed, thank you very much.