adb shell settings list system

Android Settings provider (system namespace)

adb shell settings get system volume_system

Get current system volume level in Android.

adb shell settings get system notification_sound

Get current system notification sound in Android.

adb shell settings list secure

Android Settings provider (secure namespace)

adb shell settings get secure android_id

Find Android Device Identifier(Device Id)

adb shell settings get secure bluetooth_address

Find Bluetooth MAC address in android.

adb shell settings list global

Android Settings provider (global namespace)

adb shell settings get global mobile_data

Get current mobile data status in Android.

adb shell settings get global wifi_on

Get current WiFi status in Android.