public static BatteryStatus ToBatteryStatus(this Windows.System.Power.BatteryStatus status)
{
switch (status)
{
case Windows.System.Power.BatteryStatus.Discharging:
return(BatteryStatus.Discharging);
case Windows.System.Power.BatteryStatus.Idle:
return(BatteryStatus.Idle);
case Windows.System.Power.BatteryStatus.Charging:
return(BatteryStatus.Charging);
}
return(BatteryStatus.NotPresent);
}
internal BatteryReport()
{
// battery values are current for object creation
// using info from https://developer.android.com/training/monitoring-device-state/battery-monitoring
var ifilter = new Android.Content.IntentFilter(Android.Content.Intent.ActionBatteryChanged);
var batteryStatus = Android.App.Application.Context.RegisterReceiver(null, ifilter);
if (batteryStatus is null)
{
Status = UwpBatteryStatus.NotPresent;
return;
}
// since API 5, so we don't have to check OS level
if (!batteryStatus.GetBooleanExtra(Android.OS.BatteryManager.ExtraPresent, false))
{
Status = UwpBatteryStatus.NotPresent;
return;
}
Status = UwpStatusFromAndroidStatus(batteryStatus.GetIntExtra(Android.OS.BatteryManager.ExtraStatus, -1));
if (Android.OS.Build.VERSION.SdkInt < Android.OS.BuildVersionCodes.Lollipop)
{
// this probably doesn't happen, but anyway we can try to set some values...
// since API 5
int level = batteryStatus.GetIntExtra(Android.OS.BatteryManager.ExtraLevel, 1);
int scale = batteryStatus.GetIntExtra(Android.OS.BatteryManager.ExtraScale, 100);
// 100*RemainingCapacityInMilliwattHours / FullChargeCapacityInMilliwattHours gives percentage of remaining battery
RemainingCapacityInMilliwattHours = level;
FullChargeCapacityInMilliwattHours = scale;
return;
}
// now, we have API 21+, so we have more values
// voltage is int, but in mV; we want to have voltage in Volts
float voltage = batteryStatus.GetIntExtra(Android.OS.BatteryManager.ExtraVoltage, 0) / 1000;
using var batteryManager = (Android.OS.BatteryManager?)Android.App.Application.Context.GetSystemService(Android.Content.Context.BatteryService);
if (batteryManager is null)
{
Status = UwpBatteryStatus.NotPresent;
return;
}
int currentMicroAmps = batteryManager.GetIntProperty((int)Android.OS.BatteryProperty.CurrentNow); // Instantaneous battery current in microamperes, as an integer.
int chargeCounterMicroAmpHr = batteryManager.GetIntProperty((int)Android.OS.BatteryProperty.ChargeCounter); // Battery capacity in microampere-hours, as an integer.
// long energyCounterNanoWattHr = batteryManager.GetLongProperty((int)Android.OS.BatteryProperty.EnergyCounter); // Battery remaining energy in nanowatt-hours, as a long integer.
int energyCounterNanoWattHr = batteryManager.GetIntProperty((int)Android.OS.BatteryProperty.EnergyCounter); // But in reality, seems like it is int not long (doc has error here)
// Android: Instantaneous battery current in microamperes, as an integer.
// UWP: mW
// both: > 0 charging, < 0 discharging
// conversion: milli = 1000 micro; and watt = volt * amper
ChargeRateInMilliwatts = (int)(voltage * currentMicroAmps / 1000);
// Android: Battery remaining energy in nanowatt-hours, as a long integer.
// UWP: mWh
// conversion: milli = 1000 micro; and micro = 1000 nano
RemainingCapacityInMilliwattHours = (int)(energyCounterNanoWattHr / (1000 * 1000));
// Android: Battery capacity in microampere-hours, as an integer.
// UWP: mWh
// conversion: milli = 1000 micro; and watt = volt * amper
FullChargeCapacityInMilliwattHours = (int)(voltage * chargeCounterMicroAmpHr / 1000);
// UWP doc says: Some battery controllers might return the same value as FullChargeCapacityInMilliwattHours or return no value at all.
DesignCapacityInMilliwattHours = FullChargeCapacityInMilliwattHours;
}
