public void EnableIfNeeded(BluetoothAdapter adapter)
{
if (!adapter.IsEnabled)
{
adapter.Enable();
}
}
private void CheckBt() {
mBluetoothAdapter = BluetoothAdapter.DefaultAdapter;
if (!mBluetoothAdapter.Enable()) {
Toast.MakeText(this, "Bluetooth Desactivado",
ToastLength.Short).Show();
}
if (mBluetoothAdapter == null) {
Toast.MakeText(this,
"Bluetooth No Existe o esta Ocupado", ToastLength.Short)
.Show();
}
}
protected override void OnCreate(Bundle savedInstanceState)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
Android.Bluetooth.BluetoothAdapter bluetoothAdapter = BluetoothAdapter.DefaultAdapter;
// is bluetooth enabled?
// or
bluetoothAdapter.Enable();
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
Forms.Init(this, savedInstanceState);
UserDialogs.Init(() => (Activity)Forms.Context);
this.LoadApplication(new App());
}
public void ChangeBTStateTo(string state)
{
Android.Bluetooth.BluetoothAdapter bluetootAdapter = BluetoothAdapter.DefaultAdapter;
if (state == "ON")
{
if (bluetootAdapter.IsEnabled == false)
{
bluetootAdapter.Enable();
}
}
else
{
if (bluetootAdapter.IsEnabled == true)
{
bluetootAdapter.Disable();
}
}
}
public async Task OpenBluetooth()
{
Android.Bluetooth.BluetoothAdapter bluetoothAdapter = BluetoothAdapter.DefaultAdapter;
// is bluetooth enabled?
if (bluetoothAdapter.IsEnabled)
{
// bluetoothAdapter.Disable();
}
else
{
bluetoothAdapter.Enable();
MainActivity activity = Forms.Context as MainActivity;
var permissionCheck = ContextCompat.CheckSelfPermission(activity.BaseContext.ApplicationContext, Manifest.Permission.AccessCoarseLocation);
var permissionCheck1 = ContextCompat.CheckSelfPermission(activity.BaseContext.ApplicationContext, Manifest.Permission.AccessFineLocation);
}
// or
}
private void findBTPrinter()
{
btdevices.Clear ();
try{
mBluetoothAdapter = BluetoothAdapter.DefaultAdapter;
if (mBluetoothAdapter==null)
{
Toast.MakeText (this, "Error initialize bluetooth Adapter. Try again", ToastLength.Long).Show ();
return;
}
if (!mBluetoothAdapter.Enable()) {
Intent enableBluetooth = new Intent(
BluetoothAdapter.ActionRequestEnable);
StartActivityForResult(enableBluetooth, 0);
}
var pair= mBluetoothAdapter.BondedDevices;
if (pair.Count > 0) {
foreach (BluetoothDevice dev in pair) {
btdevices.Add(dev.Name);
}
}
adapterBT = new ArrayAdapter(this, Android.Resource.Layout.SimpleSpinnerItem, btdevices.ToArray());
adapterBT.SetDropDownViewResource (Android.Resource.Layout.SimpleSpinnerDropDownItem);
spinBt.Adapter = adapterBT;
spinBt.ItemSelected += new EventHandler<AdapterView.ItemSelectedEventArgs> ( SpinBt_ItemClick );
//txtv.Text ="found device " +mmDevice.Name;
}catch(Exception ex) {
Toast.MakeText (this, "Error initialize bluetooth Adapter. Try again", ToastLength.Long).Show ();
}
}
void findBTPrinter()
{
string printername = apara.PrinterName.Trim ().ToUpper ();
// string addrfile = getBTAddrFile(printername);
// if (tryConnectBtAddr(addrfile))
// return;
try{
mBluetoothAdapter = BluetoothAdapter.DefaultAdapter;
if (mBluetoothAdapter==null)
{
Toast.MakeText (this, "Error initialize bluetooth Adapter. Try again", ToastLength.Long).Show ();
return;
}
string txt ="";
if (!mBluetoothAdapter.Enable()) {
Intent enableBluetooth = new Intent(
BluetoothAdapter.ActionRequestEnable);
StartActivityForResult(enableBluetooth, 0);
}
var pair= mBluetoothAdapter.BondedDevices;
if (pair.Count > 0) {
foreach (BluetoothDevice dev in pair) {
Console.WriteLine (dev.Name);
txt = txt+","+dev.Name;
if (dev.Name.ToUpper()==printername)
{
mmDevice = dev;
// File.WriteAllText(addrfile,dev.Address);
break;
}
}
}
Toast.MakeText (this, "found device " +mmDevice.Name, ToastLength.Long).Show ();
//txtv.Text ="found device " +mmDevice.Name;
}catch(Exception ex) {
mmDevice = null;
Toast.MakeText (this, "Error initialize bluetooth Adapter. Try again", ToastLength.Long).Show ();
}
}
//Evento de conexion al Bluetooth
public void Connect()
{
//asignamos el sensor bluetooth con el que vamos a trabajar
mBluetoothAdapter = BluetoothAdapter.DefaultAdapter;
//Verificamos que este habilitado
if (!mBluetoothAdapter.Enable())
{
Toast.MakeText(this, "Bluetooth Desactivado",
ToastLength.Short).Show();
}
//verificamos que no sea nulo el sensor
if (mBluetoothAdapter == null)
{
Toast.MakeText(this,
"Bluetooth No Existe o esta Ocupado", ToastLength.Short)
.Show();
}
//Iniciamos la conexion con el arduino
BluetoothDevice device = mBluetoothAdapter.GetRemoteDevice(address);
System.Console.WriteLine("Conexion en curso" + device);
//Indicamos al adaptador que ya no sea visible
mBluetoothAdapter.CancelDiscovery();
try
{
//Inicamos el socket de comunicacion con el arduino
btSocket = device.CreateRfcommSocketToServiceRecord(MY_UUID);
//Conectamos el socket
btSocket.Connect();
System.Console.WriteLine("Conexion Correcta");
}
catch (System.Exception e)
{
//en caso de generarnos error cerramos el socket
Console.WriteLine(e.Message);
try
{
btSocket.Close();
}
catch (System.Exception)
{
System.Console.WriteLine("Imposible Conectar");
}
System.Console.WriteLine("Socket Creado");
}
//Una vez conectados al bluetooth mandamos llamar el metodo que generara el hilo
//que recibira los datos del arduino
beginListenForData();
//NOTA envio la letra e ya que el sketch esta configurado para funcionar cuando
//recibe esta letra.
//dataToSend = new Java.Lang.String("Hola");
//writeData(dataToSend);
}
private void FindBTPrinter()
{
string printername = apara.PrinterName.Trim ().ToUpper ();
try{
mBluetoothAdapter = BluetoothAdapter.DefaultAdapter;
if (mBluetoothAdapter ==null)
{
msg = callingActivity.Resources.GetString(Resource.String.msg_bluetoothnofound);
return;
}
string txt ="";
if (!mBluetoothAdapter.Enable()) {
Intent enableBluetooth = new Intent(
BluetoothAdapter.ActionRequestEnable);
StartActivityForResult(enableBluetooth, 0);
}
var pair= mBluetoothAdapter.BondedDevices;
if (pair.Count > 0) {
foreach (BluetoothDevice dev in pair) {
Console.WriteLine (dev.Name);
txt = txt+","+dev.Name;
if (dev.Name.ToUpper()==printername)
{
mmDevice = dev;
// File.WriteAllText(addrfile,dev.Address);
break;
}
}
}
msg= callingActivity.Resources.GetString(Resource.String.msg_bluetoothfound) +mmDevice.Name;
}catch {
//txtv.Text = ex.Message;
mmDevice = null;
msg = callingActivity.Resources.GetString(Resource.String.msg_bluetoothnofound);
//AlertShow(ex.Message);
}finally {
if (mBluetoothAdapter != null) {
if (mBluetoothAdapter.IsDiscovering) {
mBluetoothAdapter.CancelDiscovery ();
Thread.Sleep (300);
}
mBluetoothAdapter.Dispose ();
mBluetoothAdapter = null;
}
}
}
