private void InitNmeaProvider(NmeaParser.Gnss.GnssMonitor oldDevice, NmeaParser.Gnss.GnssMonitor newDevice)
{
mapView.LocationDisplay.IsEnabled = false;
if (newDevice != null)
{
mapView.LocationDisplay.DataSource = new NmeaLocationDataSource(newDevice, false);
mapView.LocationDisplay.IsEnabled = IsLoaded;
}
}
private async void startButton_Click(object sender, RoutedEventArgs e)
{
var info = nmeaDevicePicker.SelectedItem as DeviceInfo;
if (info != null)
{
var device = await info.CreateMethod();
output.Text = string.Empty;
messages.Clear();
device.MessageReceived += device_MessageReceived;
var _ = device.OpenAsync();
listener = device;
startButton.IsEnabled = false;
stopButton.IsEnabled = true;
monitor = new NmeaParser.Gnss.GnssMonitor(device);
gnssMonitorView.DataContext = monitor;
}
}
private async void Start()
{
startButton.Enabled = false;
status = FindViewById <TextView>(Resource.Id.output);
var devicePicker = FindViewById <Spinner>(Resource.Id.device_picker);
var id = devicePicker.SelectedItem.ToString();
var btAddress = devices[id];
if (btAddress == null)
{
if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.AccessFineLocation) != Permission.Granted)
{
ActivityCompat.RequestPermissions(this, new[] { Manifest.Permission.AccessFineLocation }, 1000);
return;
}
if (launched)
{
return;
}
launched = true;
listener = new NmeaParser.SystemNmeaDevice(ApplicationContext);
}
else //Bluetooth
{
try
{
status.Text = "Opening bluetooth...";
var adapter = Android.Bluetooth.BluetoothAdapter.DefaultAdapter;
var bt = Android.Bluetooth.BluetoothAdapter.DefaultAdapter.GetRemoteDevice(btAddress);
Java.Util.UUID SERIAL_UUID = Java.Util.UUID.FromString("00001101-0000-1000-8000-00805F9B34FB"); //UUID for Serial Device Service
socket = bt.CreateRfcommSocketToServiceRecord(SERIAL_UUID);
try
{
await socket.ConnectAsync();
}
catch (Java.IO.IOException)
{
// This sometimes fails. Use fallback approach to open socket
// Based on https://stackoverflow.com/a/41627149
socket.Dispose();
var m = bt.Class.GetMethod("createRfcommSocket", new Java.Lang.Class[] { Java.Lang.Integer.Type });
socket = m.Invoke(bt, new Java.Lang.Object[] { 1 }) as Android.Bluetooth.BluetoothSocket;
socket.Connect();
}
listener = new NmeaParser.StreamDevice(socket.InputStream);
}
catch (System.Exception ex)
{
socket?.Dispose();
socket = null;
status.Text += "\nError opening Bluetooth device:\n" + ex.Message;
}
}
if (listener != null)
{
listener.MessageReceived += Listener_MessageReceived;
status.Text += "\nOpening device...";
await listener.OpenAsync();
status.Text += "\nConnected!";
startButton.Enabled = !(stopButton.Enabled = true);
monitor = new NmeaParser.Gnss.GnssMonitor(listener);
monitor.LocationChanged += Monitor_LocationChanged;
}
else
{
startButton.Enabled = !(stopButton.Enabled = false);
}
}
