Check if there a usb/AC connection - windows-phone

Question

I'm developing an universal windows phone application which checks if there a connection via usb or AC charging.
I used this code:
var deviceInfo = await DeviceInformation.FindAllAsync(Battery.GetDeviceSelector());
var aggBattery = Battery.AggregateBattery;
var report = aggBattery.GetReport();
report.Status.ToString();
It works well for some devices.
There are few devices (devices which got upgraded from WP8 to WP10) that takes them 30 seconds to detect the "charging mode".

Answer 1

I want to know if there a way to detect a usb connection?
To detect USB device, we can use a DeviceWatcher object to detect when the device is added to or removed from the system.
For Windows 10 Universal app, here is a good sample: Device enumeration sample
or get the battery level?
The Battery class does not provide method to get the battery level.
As a workaround, we can use BatteryReport.RemainingCapacityInMilliwattHours to get the remaining power capacity of the battery, in milliwatt-hours. Also we can use BatteryReport.FullChargeCapacityInMilliwattHours to get the fully-charged energy capacity of the battery. Then we can use BatteryReport.RemainingCapacityInMilliwattHours/BatteryReport.FullChargeCapacityInMilliwattHours to get the battery level.
For example:
var deviceInfo = await DeviceInformation.FindAllAsync(Battery.GetDeviceSelector());
var aggBattery = Battery.AggregateBattery;
var report = aggBattery.GetReport().RemainingCapacityInMilliwattHours;
var report3 = aggBattery.GetReport().FullChargeCapacityInMilliwattHours;
MyText.Text = (report / (double)report3).ToString();