How to send a character (char) via bluetooth

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I would like to send the number 1 via bluetooth on android, I already did the connection part missing to send
   - this is the source code 

    public void  conectar(ProgressBar loading, BluetoothSocket socket) { 
        loading.Visibility = Android.Views.ViewStates.Visible;      

        try {

            socket.Connect();

        }
        catch (Exception)
        {
            loading.Visibility = Android.Views.ViewStates.Gone;
            Toast.MakeText(this, "Não foi possivel conectar", ToastLength.Long).Show();


        }
        try
        {
            var output = socket.InputStream;
            loading.Visibility = Android.Views.ViewStates.Gone;

            Toast.MakeText(this, "pode escrever", ToastLength.Long).Show();
            byte[] buffer = new byte[1024];

            output.Write(buffer, 1, 1);

        }
        catch (Exception) { 
        Toast.MakeText(this, "Não foi possivel enviar a mensagem", ToastLength.Long).Show();
        loading.Visibility = Android.Views.ViewStates.Gone;
        }





    }

    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        SetContentView(Resource.Layout.tela);

        BluetoothAdapter adaptador = BluetoothAdapter.DefaultAdapter; // procura o adap. bluetooth 

        TextView aparelho1 = FindViewById<TextView>(Resource.Id.aparelho1);
        TextView aparelhoconfig = FindViewById<TextView>(Resource.Id.aparelhoconfig);
        TextView aparelho2 = FindViewById<TextView>(Resource.Id.aparelho2);
        TextView aparelho2config = FindViewById<TextView>(Resource.Id.aparelho2config);
        RelativeLayout layout1 = FindViewById<RelativeLayout>(Resource.Id.layoutaparelho1);
        RelativeLayout layout2 = FindViewById<RelativeLayout>(Resource.Id.layoutaparelho2);
        ProgressBar loading = FindViewById<ProgressBar>(Resource.Id.progressBar1);

        loading.Visibility = Android.Views.ViewStates.Gone;

        if (adaptador == null)
        {
            Toast.MakeText(this, "Esse aparelho não tem bluetooth", ToastLength.Long).Show();
        }
        else {
            if (adaptador.IsEnabled == true)
            {
                ICollection<BluetoothDevice> aparelhos = adaptador.BondedDevices;
                BluetoothDevice[] apa = new BluetoothDevice[aparelhos.Count];
                ParcelUuid[] chaves;
                BluetoothSocket[] socket = new BluetoothSocket[aparelhos.Count];
                int i = 0;


                foreach (BluetoothDevice aparelho in aparelhos)
                {
                    apa[i] = aparelho;
                    chaves = aparelho.GetUuids();
                    socket[i] = aparelho.CreateInsecureRfcommSocketToServiceRecord(chaves[i].Uuid);
                    i++;

                }
                if (apa.Length > 0)
                {

                    aparelho1.Append(apa[0].Name);
                    aparelhoconfig.Append(apa[0].Address);
                    /// <summary>
                    /// evento ao clicar no outro relative layout1
                    /// </summary>

                    layout1.Click += delegate
                    {
                        Toast.MakeText(this,"clicou",ToastLength.Short).Show();
                        conectar(loading,socket[0]);
                    };
                    //final

                    if (apa.Length > 1)
                    {
                        aparelho2.Append(apa[1].Name);
                        aparelhoconfig.Append(apa[1].Address);
                        /// <summary>
                        /// evento ao clicar no outro relative layout2
                        /// </summary>
                        layout2.Click += delegate
                        {


                        };
                        //final
                    }


                }




            }
            else {
                Toast.MakeText(this, "Ative o bluetooth para continuar", ToastLength.Long).Show();

            }



        }
    }'
    
asked by anonymous 14.10.2016 / 18:08

1 answer

1

When you connect with two (or more) devices, each will have a BluetoothSocket strong> connected. Basically you would have to use ConnectedThread by passing the your socket , and then the fun begins. See below: 

ConnectedThread mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();

To read and write data, you need to use read(byte[]) and write(byte[]) . Here is a basic example of how to use it using two buttons: 

    btnDesliga.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        mConnectedThread.write("0");              
      }
    });

    btnLiga.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        mConnectedThread.write("1");
      }
    });

Hugs.

    
14.10.2016 / 18:49
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