public static Task <bool> RequestPermissionAsync(this UsbManager manager, UsbDevice device, Context context)
{
if (manager == null)
{
throw new ArgumentNullException(nameof(manager));
}
if (device == null)
{
throw new ArgumentNullException(nameof(device));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
string permission = String.Format(ExtendedUsbConstants.ACTION_USB_PERMISSION_FORMAT, context.PackageName);
var usbPermissionReceiver = new UsbBroadcastReceiver <bool>((c, i) => i.GetBooleanExtra(UsbManager.ExtraPermissionGranted, false));
usbPermissionReceiver.Register(context, permission, true);
PendingIntent intent = PendingIntent.GetBroadcast(context, 0, new Intent(permission), 0);
manager.RequestPermission(device, intent);
return(usbPermissionReceiver.ReceiveTask);
}
protected override void Initialize()
{
usbManager = (UsbManager)context.GetSystemService(Android.Content.Context.UsbService);
usbBroadcastReceiver = new UsbBroadcastReceiver();
usbBroadcastReceiver.addDevice = AddDevice;
usbBroadcastReceiver.filterDevice = FilterDevice;
usbBroadcastReceiver.removeDevice = RemoveDevice;
IntentFilter f = new IntentFilter(ACTION_USB_PERMISSION);
context.RegisterReceiver(usbBroadcastReceiver, f);
context.RegisterReceiver(usbBroadcastReceiver, new IntentFilter(UsbManager.ActionUsbDeviceAttached));
context.RegisterReceiver(usbBroadcastReceiver, new IntentFilter(UsbManager.ActionUsbDeviceDetached));
}
protected override void OnResume()
{
base.OnResume();
lock (_registrationLocker)
{
if (!_isReceiverRegistered)
{
_detachedReceiver = new UsbBroadcastReceiver((c, i) =>
{
if (i.GetParcelableExtra(UsbManager.ExtraDevice) is UsbDevice device)
{
_serialService.SetDeviceAsDisconnected();
MessagingCenter.Send(new DeviceMessage(device.DeviceName), DeviceMessage.DeviceDetached);
}
});
_detachedReceiver.Register(this, UsbManager.ActionUsbDeviceDetached);
_isReceiverRegistered = true;
}
}
}
