Google Glass GDK: cómo comunicarse con el dispositivo Android

Estoy buscando una forma de enviar datos entre mi dispositivo Android y Google Glass que no dependa de la API de Cloud. ¿Se apoya esto? 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 muestra cómo se hace esto? ¿O tengo que descompilar la aplicación MyGlass para resolverlo?

¿Existe un método preferido para realizar este tipo de transferencia de datos? Idealmente, me gustaría transferir datos en ambas direcciones.

Ok, para los solicitantes ….

EDIT: El código de abajo sigue funcionando, pero lo he puesto en un repo git para aquellos que estén interesados ​​…

https://github.com/NathanielWaggoner/GoogleGlassBlutooth

Aquí está mi código del anfitrión / cliente de 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 From the Hand Held y manejando las actualizaciones de la interfaz de usuario (publicando tarjetas en vivo, actualizando tarjetas en vivo, etc …) durante unos tres días usando esto ahora.

Anfitrión:

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 del anfitrión:

  <?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> 

Voy a dejar la interfaz de usuario como un ejercicio para el lector.

No hay método preferido, pero si usted está mirando para hacerlo sin hilos, un Bluetooth 3.0 RFCOMM trabaja.

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

Varias cosas que noté al seguir esta solución (trabajo impresionante por cierto!)

1) Sólo podría crear una conexión Bluetooth cuando mi teléfono y Google Glass no estuvieran ya emparejados a través de la aplicación MyGlass. Si tiene problemas para establecer una conexión, intente olvidarse de esa asociación.

2) El Glass API no admite el control de la conexión Bluetooth a través de intentos con 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 los auriculares de vidrio detectable (en lugar del teléfono se está conectando a), que necesitaba para seguir las soluciones similares a los como user4934624 siempre en esta pregunta y shantanu dio en esta pregunta . Invoqué un método oculto para acceder directamente a la funcionalidad del bluetooth. Advertencia: el método oculto parece haber estado allí durante años, pero no hay garantía de que seguirá siendo en futuras API.

  // 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 da salida a los nombres de todos los métodos de la clase que he reflejado; Que me permitió limitar mi búsqueda para qué método quería utilizar.

La aplicación JoeGlass para android pretende ser un reemplazo para MyGlass. Hablará con su vaso directamente, utilizando una conexión Bluetooth. No lo he probado todavía, pero es de código abierto (github), así que si funciona, eres bueno.

Mi libro Beginning Google Glass Development tiene un capítulo completo sobre este tema, con código de ejemplo completamente funcional sobre el uso de Bluetooth y socket para transferir datos entre los dispositivos Glass y 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 su descarga en http://www.apress.com/downloadable/download/sample/sample_id/1562/

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