Google Glass GDK: Cómo comunicarse con un dispositivo Android

Question

Google Glass GDK: Cómo comunicarse con un dispositivo Android

Estoy buscando una forma de enviar datos entre mi dispositivo Android y Google Glass que no dependa de API en la nube. Veo las conexiones Bluetooth en la aplicación My Glass, lo que me hace pensar que se puede hacer. ¿Hay un código fuente de ejemplo que muestre cómo se hace esto? O tengo que descompilar la aplicación MyGlass para entenderlo?

¿Hay un método preferido para hacer este tipo de transferencia de datos? Idealmente me gustaría transferir datos en ambas direcciones.

25

android bluetooth google-glass google-gdk

Author: mimming, 2013-12-03

Source

5 answers

No hay un método preferido, pero si está buscando hacerlo de forma inalámbrica, un Bluetooth 3.0 RFCOMM funciona.

Si proporciona más detalles sobre el problema que está tratando de resolver en su pregunta, podré proporcionar una respuesta más específica.

4

Author: mimming,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2013-12-03 23:36:38

Varias cosas me di cuenta al seguir esta solución (trabajo impresionante por cierto!)

1) Solo pude crear una conexión bluetooth cuando mi teléfono y el Google Glass no estaban ya emparejados a través de la aplicación MyGlass; Si tiene problemas para establecer una conexión, intente olvidar ese emparejamiento.

2) La API Glass no admite el control de su conexión bluetooth a través de intents utilizando comandos como

Intent discoveryIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoveryIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, DISCOVER_DURATION);
startActivityForResult(discoveryIntent, REQUEST_BLU);

Con el fin de hacer que el auricular de vidrio sea detectable (en lugar del teléfono al que se está conectando), necesitaba seguir soluciones similares a aquellas como user4934624 proporcionadas en esta pregunta y shantanu dio en esta pregunta. Invoqué un método oculto para acceder directamente a la funcionalidad bluetooth. Advertencia: el método oculto parece haber estado allí durante años, pero no hay garantía de que continuará en las API futuras.

 // this method allows us to make the device discoverable without alerting the users
// NOTE!!!! This uses a hidden method, so it may be removed from the API in the future
public void makeDiscoverable (){

    Class <?> baClass = BluetoothAdapter.class;
    Method[] methods = baClass.getDeclaredMethods();

    // we want to use method setScanMode(int mode, int duration)
    // there are 2 setScanModes
    // so select the first setScanMode you see

    // test to see which method is the one we want
    //for (int i = 0; i<50; i++) {Log.d(Integer.toString(i), methods[i].getName());}

    //I had trouble calling the first setScanMode, so I called the second.
    // I need to pass in a discoverable time, but it stays discoverable indefinitely
    // Thus you must turn off the setScanMode as soon as the connection is established
    // I should probably write in some other security stuff to turn it off if connection fails
    // maybe a timer running on a different thread?


    Method mSetScanMode = methods[38];
    try {
        mSetScanMode.invoke(myBt, BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE,300);
        //mSetScanMode.invoke(myBt, BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE);


    } catch (Exception e) {
        Log.e("discoverable", e.getMessage());
    }
}

// this method allows us to make the device not discoverable without alerting the user
// NOTE!!!! This uses a hidden method, so it may be removed from the API in the future
public void makeNotDiscoverable (){

    // see notes for makeDiscoverable
    Class <?> baClass = BluetoothAdapter.class;
    Method [] methods = baClass.getDeclaredMethods();

    Method mSetScanMode = methods[38];
    try {
       mSetScanMode.invoke(myBt, BluetoothAdapter.SCAN_MODE_CONNECTABLE,300);
    } catch (Exception e) {
        Log.e("discoverable", e.getMessage());
    }
}

Tenga en cuenta que primero ejecuté una prueba que muestra los nombres de todos los métodos de la clase I mirrored; eso me permitió reducir mi búsqueda para el método que quería utilizar.

1

Author: Nick,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2017-05-23 10:30:01

La aplicación JoeGlass para Android afirma ser un reemplazo para MyGlass. Hablará directamente con su vidrio, usando una conexión bluetooth. Todavía no lo he probado, pero es de código abierto (github), por lo que si funciona, eres bueno.

0

Author: dirkjot,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2014-06-26 09:08:59

Mi libro Beginning Google Glass Development tiene un capítulo completo sobre este tema, con un código de ejemplo completamente funcional sobre el uso de Bluetooth y socket para transferir datos entre Glass y dispositivos Android (o iOS).

El libro está disponible en amazon: http://www.amazon.com/Beginning-Google-Glass-Development-Jeff/dp/1430267887

Y el código fuente está disponible para descargar en http://www.apress.com/downloadable/download/sample/sample_id/1562 /

0

Author: Jeff Tang,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2014-11-11 06:41:07

score 22 · Accepted Answer

Ok, para los solicitantes....

EDITAR: El código de abajo todavía funciona, pero lo he puesto en un repositorio git para aquellos que estén interesados...

Https://github.com/NathanielWaggoner/GoogleGlassBlutooth

Aquí está mi código de Host/cliente Bluetooth. No es perfecto-Vas a necesitar un poco de paciencia, y hay algunos errores en la reconexión y tal, pero funciona. He estado enviando datos a Glass Desde la mano y conduciendo actualizaciones de la interfaz de usuario (publicando live cards, actualización de live cards, etc...) durante unos tres días usando esto ahora.

Host:

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.UUID;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;


public class BluetoothHost extends Activity {

    public static String msgToSend="";
    public static final int STATE_CONNECTION_STARTED = 0;
    public static final int STATE_CONNECTION_LOST = 1;
    public static final int READY_TO_CONN = 2;
    public static final String DEVICE_NAME = "device_name";
    public static final String TOAST = "toast";

    // our last connection
    ConnectedThread mConnectedThread;// = new ConnectedThread(socket);
    // track our connections
    ArrayList<ConnectedThread> mConnThreads;
    // bt adapter for all your bt needs (where we get all our bluetooth powers)
    BluetoothAdapter myBt;
    // list of sockets we have running (for multiple connections)
    ArrayList<BluetoothSocket> mSockets = new ArrayList<BluetoothSocket>();
    // list of addresses for devices we've connected to
    ArrayList<String> mDeviceAddresses = new ArrayList<String>();
    // just a name, nothing more...
    String NAME="G6BITCHES";
    // We can handle up to 7 connections... or something...
    UUID[] uuids = new UUID[2];
    // some uuid's we like to use..
    String uuid1 = "05f2934c-1e81-4554-bb08-44aa761afbfb";
    String uuid2 = "c2911cd0-5c3c-11e3-949a-0800200c9a66";
    // just a tag..
    String TAG = "G6 Bluetooth Host Activity";  
    // constant we define and pass to startActForResult (must be >0), that the system passes back to you in your onActivityResult() 
    // implementation as the requestCode parameter.
    int REQUEST_ENABLE_BT = 1;  
    AcceptThread accThread;
    TextView connectedDevices;
    Handler handle;
    BroadcastReceiver receiver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // the activity for this is pretty stripped, just a basic selection ui....
        setContentView(R.layout.activity_main);
        uuids[0] = UUID.fromString(uuid1);
        uuids[1] = UUID.fromString(uuid2);
        connectedDevices = (TextView) findViewById(R.id.connected_devices_values);
        handle = new Handler(Looper.getMainLooper()) {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                case STATE_CONNECTION_STARTED:
                    connectedDevices.setText(msg.getData().getString("NAMES"));
                    break;
                case STATE_CONNECTION_LOST:
                    connectedDevices.setText("");
                    startListening();
                    break;
                case READY_TO_CONN:
                    startListening();
                default:
                    break;
                }
            }
        };

        // ....
        myBt = BluetoothAdapter.getDefaultAdapter();
        // run the "go get em" thread..
        accThread = new AcceptThread();
        accThread.start();
    }
    public void startListening() {
        if(accThread!=null) {
            accThread.cancel();
        }else if (mConnectedThread!= null) {
            mConnectedThread.cancel();
        } else {
            accThread = new AcceptThread();
            accThread.start();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    private class AcceptThread extends Thread {
        private BluetoothServerSocket mmServerSocket;
        BluetoothServerSocket tmp;

        public AcceptThread() {
            BluetoothServerSocket tmp = null;
            try {
                tmp = myBt.listenUsingInsecureRfcommWithServiceRecord(NAME, uuids[0]);

            } catch (IOException e) { }
            mmServerSocket = tmp;
        }

        public void run() {
            Log.e(TAG,"Running?");
            BluetoothSocket socket = null;
            // Keep listening until exception occurs or a socket is returned
            while (true) {

                try {

                    socket = mmServerSocket.accept();
                } catch (IOException e) {
                    e.printStackTrace();
                    break;
                }
                // If a connection was accepted

                if (socket != null) {
                    try {
                        mmServerSocket.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    // Do work to manage the connection (in a separate thread)
                    manageConnectedSocket(socket);

                    break;
                }
            }
        }

        /** Will cancel the listening socket, and cause the thread to finish */
        public void cancel() {
            try {
                mmServerSocket.close();
                Message msg = handle.obtainMessage(READY_TO_CONN);
                handle.sendMessage(msg);                

            } catch (IOException e) { }
        }
    }


    private void manageConnectedSocket(BluetoothSocket socket) {
        // start our connection thread
        mConnectedThread = new ConnectedThread(socket);
        mConnectedThread.start();

        // Send the name of the connected device back to the UI Activity
        // so the HH can show you it's working and stuff...
        String devs="";
        for(BluetoothSocket sock: mSockets) {
            devs+=sock.getRemoteDevice().getName()+"\n";
        }
        // pass it to the UI....
        Message msg = handle.obtainMessage(STATE_CONNECTION_STARTED);
        Bundle bundle = new Bundle();
        bundle.putString("NAMES", devs);
        msg.setData(bundle);

        handle.sendMessage(msg);                
    }
    private class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            Log.d(TAG, "create ConnectedThread");
            mmSocket = socket;
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the BluetoothSocket input and output streams
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) {
                Log.e(TAG, "temp sockets not created", e);
            }
            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            Log.i(TAG, "BEGIN mConnectedThread");
            byte[] buffer = new byte[1024];
            int bytes;

            // Keep listening to the InputStream while connected
            while (true) {
                try {
                    //byte[] blah = ("System Time:" +System.currentTimeMillis()).getBytes();
                    if(!msgToSend.equals("")) {
                        Log.e(TAG,"writing!");
                        write(msgToSend.getBytes());
                        setMsg("");
                    }
                    Thread.sleep(1000);
                } catch (Exception e) {
                    Log.e(TAG, "disconnected", e);
                    connectionLost();
                }
            }
        }
        public void connectionLost() {
            Message msg = handle.obtainMessage(STATE_CONNECTION_LOST);
            handle.sendMessage(msg);                
        }
        /**
         * Write to the connected OutStream.
         * @param buffer  The bytes to write
         */
        public void write(byte[] buffer) {
            try {
                mmOutStream.write(buffer);
            } catch (IOException e) {
                Log.e(TAG, "Exception during write", e);
                connectionLost();
            }
        }

        public void cancel() {
            try {
                mmSocket.close();
                Message msg = handle.obtainMessage(READY_TO_CONN);
                handle.sendMessage(msg);                
            } catch (IOException e) {
                Log.e(TAG, "close() of connect socket failed", e);
            }
        }
    }
    public static synchronized void setMsg(String newMsg) {
        msgToSend = newMsg;
    }
    public static class HostBroadRec extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            Bundle b= intent.getExtras();
            String vals ="";
            for(String key: b.keySet()) {
                vals+=key+"&"+b.getString(key)+"Z";
            }
            BluetoothHost.setMsg(vals);
        }
    }
}

Cliente:

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

public class BluetoothClient extends Activity {

    public static final int READY_TO_CONN =0;
    public static final int CANCEL_CONN =1;
    public static final int MESSAGE_READ =2;

    // holds the bluetooth names/ids that we're associated with.
    ArrayAdapter<String> btArray;
    // bt adapter for all your bt needs
    BluetoothAdapter myBt;
    String NAME="G6BITCHES";
    String TAG = "G6 Bluetooth Slave Activity";
    UUID[] uuids = new UUID[2];
    // some uuid's we like to use..
    String uuid1 = "05f2934c-1e81-4554-bb08-44aa761afbfb";
    String uuid2 = "c2911cd0-5c3c-11e3-949a-0800200c9a66";
    //  DateFormat df = new DateFormat("ddyyyy")
    ConnectThread mConnThread;
    Spinner devices;
    Handler handle;
    // constant we define and pass to startActForResult (must be >0), that the system passes back to you in your onActivityResult() 
    // implementation as the requestCode parameter.
    int REQUEST_ENABLE_BT = 1;
    // bc for discovery mode for BT...
    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            // When discovery finds a device
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                // Get the BluetoothDevice object from the Intent
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                // Add the name and address to an array adapter to show in a ListView
                if(device!= null) {
                    if(device.getName().contains("Nexus")) {

                    } else {
                        btArray.add(device.getName() + "\n" + device.getAddress());

                    }
                }
                update();
            }
        }
    };

    Context ctx; 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //      publishCards(this);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        ctx = this;
        handle = new Handler(Looper.getMainLooper()) {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                case READY_TO_CONN:
                    mConnThread=null;
                    update();
                    break;
                case CANCEL_CONN:
                    break;
                case MESSAGE_READ:
                    byte[] readBuf = (byte[]) msg.obj;

                    // construct a string from the valid bytes in the buffer
                    String readMessage = new String(readBuf, 0, msg.arg1);
                    Log.e(TAG,"received: "+readMessage);
                    if (readMessage.length() > 0) {
                        // do soemthing...
                    }


                    //                      updateCards(ctx, readMessage);
                    //                          update()
                    //  mConversationArrayAdapter.add(mConnectedDeviceName+":  " + readMessage);

                    break;
                default:
                    break;
                }
            }
        };
        btArray = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, android.R.id.text1);
        btArray.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        uuids[0] = UUID.fromString(uuid1);
        uuids[1] = UUID.fromString(uuid2);
        // spinner for displaying available devices for pairing
        devices = (Spinner) findViewById(R.id.devices_spinner);
        devices.setAdapter(btArray);
        // use the same UUID across an installation
        // should allow clients to find us repeatedly
        myBt = BluetoothAdapter.getDefaultAdapter();
        if (myBt == null) {
            Toast.makeText(this, "Device Does not Support Bluetooth", Toast.LENGTH_LONG).show();
        } 
        else if (!myBt.isEnabled()) {
            // we need to wait until bt is enabled before set up, so that's done either in the following else, or 
            // in the onActivityResult for our code ...
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
        } else {
            detectAndSetUp();
        }
        setContentView(R.layout.bluetooth_activity_layout);

    }

    @Override
    public void onDestroy() {
        unregisterReceiver(mReceiver);
        super.onDestroy();

    }

    @Override
    protected void onActivityResult (int requestCode, int resultCode, Intent data){
        if(requestCode == REQUEST_ENABLE_BT) {
            if (resultCode != RESULT_OK) {
                Toast.makeText(this, "Failed to enable Bluetooth", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "Bluetooth Enabled", Toast.LENGTH_LONG).show();
                detectAndSetUp();
            }
        }
    }

    private void detectAndSetUp() {
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy

        Set<BluetoothDevice> pairedDevices = myBt.getBondedDevices();
        // If there are paired devices
        if (pairedDevices.size() > 0) {
            // Loop through paired devices
            for (BluetoothDevice device : pairedDevices) {

                if(device.getName().contains("Nexus")) {

                } else {
                    btArray.add(device.getName() + "\n" + device.getAddress());

                }
                // Add the name and address to an array adapter to show in a ListView
                //              btArray.add(device.getName() + "\n" + device.getAddress());
                //              update();
            }
        }
        myBt.startDiscovery();
    }

    public void update() {      
        devices = (Spinner) findViewById(R.id.devices_spinner);
        devices.setAdapter(btArray);
        devices.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int position, long id) {
                if(mConnThread!=null) {
                    Log.e(TAG,"Canceling old connection, and starting new one.");
                    mConnThread.cancel();
                } else {
                    Log.e(TAG,"got a thing...");
                    String str = ((TextView)arg1).getText().toString();
                    Log.e(TAG,"tots: "+str);    
                    String[] vals = str.split("\n");
                    Log.e(TAG,"mac: "+vals[1]);
                    BluetoothDevice dev = myBt.getRemoteDevice(vals[1]);
                    mConnThread = new ConnectThread(dev);
                    mConnThread.run();
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }

        });
    }
    @Override   
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.bluetooth, menu);
        return true;
    }

    private class ConnectThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final BluetoothDevice mmDevice;

        public ConnectThread(BluetoothDevice device) {
            Log.e(TAG,"ConnectThread start....");
            // Use a temporary object that is later assigned to mmSocket,
            // because mmSocket is final
            BluetoothSocket tmp = null;
            mmDevice = device;

            // Get a BluetoothSocket to connect with the given BluetoothDevice
            try {

                // this seems to work on the note3...
                // you can remove the Insecure if you want to... 
                tmp = device.createInsecureRfcommSocketToServiceRecord(uuids[0]);
                //                  Method m;
                // this is an approach I've seen others use, it wasn't nescesary for me,
                // but your results may vary...

                //                  m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
                //                  tmp = (BluetoothSocket) m.invoke(device, 1);
                //              } catch (NoSuchMethodException e1) {
                //                  // TODO Auto-generated catch block
                //                  e1.printStackTrace();
                //              } catch (IllegalArgumentException e2) {
                //                  // TODO Auto-generated catch block
                //                  e2.printStackTrace();
                //              } catch (IllegalAccessException e3) {
                //                  // TODO Auto-generated catch block
                //                  e3.printStackTrace();
                //              } catch (InvocationTargetException e4) {
                //                  // TODO Auto-generated catch block
                //                  e4.printStackTrace();
                //              }   
                //                  if(tmp.isConnected()) {
                //                      break
                //                  }



            } catch (Exception e) { 
                Log.e(TAG,"Danger Will Robinson");
                e.printStackTrace();
            }
            mmSocket = tmp;
        }

        public void run() {
            // Cancel discovery because it will slow down the connection
            myBt.cancelDiscovery();
            Log.e(TAG,"stopping discovery");

            try {
                // Connect the device through the socket. This will block
                // until it succeeds or throws an exception
                Log.e(TAG,"connecting!");

                mmSocket.connect();
            } catch (IOException connectException) {                

                Log.e(TAG,"failed to connect");

                // Unable to connect; close the socket and get out
                try {
                    Log.e(TAG,"close-ah-da-socket");

                    mmSocket.close();
                } catch (IOException closeException) { 
                    Log.e(TAG,"failed to close hte socket");

                }
                Log.e(TAG,"returning..");

                return;
            }

            Log.e(TAG,"we can now manage our connection!");

            // Do work to manage the connection (in a separate thread)
            manageConnectedSocket(mmSocket);
        }

        /** Will cancel an in-progress connection, and close the socket */
        public void cancel() {
            try {
                mmSocket.close();
                Message msg = handle.obtainMessage(READY_TO_CONN);
                handle.sendMessage(msg);                

            } catch (IOException e) { }
        }
    }

    public void manageConnectedSocket(BluetoothSocket mmSocket) {
        ConnectedThread t = new ConnectedThread(mmSocket);
        t.start();
        // manage your socket... I'll probably do a lot of the boiler plate here later
    }
    private class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            Log.d(TAG, "create ConnectedThread");
            mmSocket = socket;
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the BluetoothSocket input and output streams
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) {
                Log.e(TAG, "temp sockets not created", e);
            }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            Log.i(TAG, "BEGIN mConnectedThread");
            byte[] buffer = new byte[1024];
            int bytes;

            // Keep listening to the InputStream while connected
            while (true) {
                try {
                    //                  byte[] blah = ("System Time:" +System.currentTimeMillis()).getBytes();
                    //                  write(blah);
                    //                  Thread.sleep(1000);
                    // Read from the InputStream
                    bytes = mmInStream.read(buffer);
                    // Send the obtained bytes to the UI Activity
                    handle.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                    .sendToTarget();

                    //                  .sendToTarget();
                } catch (Exception e) {
                    Log.e(TAG, "disconnected", e);
                    connectionLost();
                    //                  break;
                }
            }
        }
        public void connectionLost() {
            Message msg = handle.obtainMessage(CANCEL_CONN);
            //          Bundle bundle = new Bundle();
            //          bundle.putString("NAMES", devs);
            //          msg.setData(bundle);

            handle.sendMessage(msg);                

        }
        /**
         * Write to the connected OutStream.
         * @param buffer  The bytes to write
         */
        public void write(byte[] buffer) {
            try {
                mmOutStream.write(buffer);

                // Share the sent message back to the UI Activity
                //              mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1, buffer)
                //              .sendToTarget();
            } catch (IOException e) {
                Log.e(TAG, "Exception during write", e);
            }
        }

        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) {
                Log.e(TAG, "close() of connect socket failed", e);
            }
        }
    }
}

Manifiesto de Host:

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="transapps.android_bluetooth_host"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="7"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="transapps.android_bluetooth_host.BluetoothHost"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name=".BluetoothHost$HostBroadRec" >
            <intent-filter>
                <action android:name="transapps.g6.new.alert" />
            </intent-filter>
        </receiver>
    </application>


</manifest>

Manifiesto del cliente:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="transapps.android_blutooth"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="15" />

    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="transapps.android_blutooth.BluetoothClient"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Dejaré la interfaz de usuario como un ejercicio para el lector.