Hi I need to connect 3 different devices (Clients) to a fourth device (Server). Here is my server code:
public class MainServerActivity extends Activity {
ArrayAdapter<String> listAdapter;
ListView listView;
TextView textViewTextoRecibido;
BluetoothAdapter btADapter;
Set<BluetoothDevice> devicesArray;
ArrayList<String> pairedDevices;
ArrayList<BluetoothDevice> devices;
IntentFilter filter;
BroadcastReceiver receiver;
public AcceptThread acceptThread;
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
public static final String NAME = "Tablet_Madre";
//public static final UUID MY_UUID = UUID.fromString("00001105-0000-1000-8000-00805F9B34FB");
ConnectedThread connectedThread;
Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case SUCCESS_CONNECT:
connectedThread = new ConnectedThread((BluetoothSocket) msg.obj);
Toast.makeText(getApplicationContext(), "Dispositivo conectado!", Toast.LENGTH_LONG).show();
//String s = "successfully connected";
//connectedThread.write(s.getBytes());
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
String string = new String(readBuf);
textViewTextoRecibido.setText(string);
Toast.makeText(getApplicationContext(), "Llego el mensaje!!!!", Toast.LENGTH_LONG).show();
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_server);
init();
if (btADapter == null) {
Toast.makeText(getApplicationContext(), "No bluetooth detectado", Toast.LENGTH_LONG).show();
finish();
} else {
if (!btADapter.isEnabled()) {
turnOnBT();
}
//getPairedDevices();
//startDiscovery();
aceptarConexiones();
}
}
private void aceptarConexiones() {
try {
acceptThread = new AcceptThread();
//acceptThread.run();
} catch (Exception e) {
System.out.print(e);
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
try {
acceptThread.run();
//start();
} catch (Exception e) {
System.out.print(e);
}
}
private void startDiscovery() {
// TODO Auto-generated method stub
btADapter.cancelDiscovery();
btADapter.startDiscovery();
}
private void turnOnBT() {
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, 1);
}
/*Inicializa todos los componentes*/
private void init() {
listView = (ListView) findViewById(R.id.listView);
//listView.setOnItemClickListener(this);
textViewTextoRecibido = (TextView) findViewById(R.id.textViewTextoRecibido);
listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, 0);
listView.setAdapter(listAdapter);
btADapter = BluetoothAdapter.getDefaultAdapter();
pairedDevices = new ArrayList<String>();
filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
devices = new ArrayList<BluetoothDevice>();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
unregisterReceiver(receiver);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Bluetooth debe estar encendido", Toast.LENGTH_SHORT).show();
finish();
}
}
public void enviarMensaje(View view){
String s = "Campeon del Siglo";
connectedThread.write(s.getBytes());
}
private class AcceptThread extends Thread{
public final BluetoothServerSocket mmServerSocket;
private int cantClientes;
public AcceptThread() {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
tmp = btADapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
} catch (IOException e) {
//Log.e(TAG, "listen() failed", e);
}
mmServerSocket = tmp;
}
public void run(){
BluetoothSocket socket = null;
while(true){
try{
socket = mmServerSocket.accept();
//No se llama al socket.connect() porque esto ya los conecta.
} catch (IOException e){
break;
}
if(socket != null){
cantClientes = cantClientes + 1;
}
mHandler.obtainMessage(SUCCESS_CONNECT, socket).sendToTarget();
if (socket != null){
//manageConnectedSocket(socket);
try {
mmServerSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
}
}
public void cancel(){
try{
mmServerSocket.close();
} catch(IOException e) {}
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[1024]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI activity
mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
break;
}
}
}
/* Call this from the main activity to send data to the remote device */
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) { }
}
/* Call this from the main activity to shutdown the connection */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
}
And this is my client code:
public class MainClientActivity extends ActionBarActivity implements OnItemClickListener {
ArrayAdapter<String> listAdapter;
ListView listView;
TextView textViewTextoRecibido;
BluetoothAdapter btADapter;
Set<BluetoothDevice> devicesArray;
ArrayList<String> pairedDevices;
ArrayList<BluetoothDevice> devices;
IntentFilter filter;
BroadcastReceiver receiver;
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
public static final String NAME = "Tablet_Madre";
//public static final UUID MY_UUID = UUID.fromString("00001105-0000-1000-8000-00805F9B34FB");
ConnectedThread connectedThread;
Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case SUCCESS_CONNECT:
connectedThread = new ConnectedThread((BluetoothSocket) msg.obj);
Toast.makeText(getApplicationContext(), "Dispositivo conectado!", Toast.LENGTH_LONG).show();
//String s = "successfully connected";
//connectedThread.write(s.getBytes());
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
String string = new String(readBuf);
textViewTextoRecibido.setText(string);
Toast.makeText(getApplicationContext(), "Llego el mensaje!!!!", Toast.LENGTH_LONG).show();
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_client);
init();
if (btADapter == null) {
Toast.makeText(getApplicationContext(), "No bluetooth detectado", Toast.LENGTH_LONG).show();
finish();
} else {
if (!btADapter.isEnabled()) {
turnOnBT();
}
getPairedDevices();
startDiscovery();
}
}
/*Inicializa todos los componentes*/
private void init() {
listView = (ListView) findViewById(R.id.listView);
listView.setOnItemClickListener(this);
textViewTextoRecibido = (TextView) findViewById(R.id.textViewTextoRecibido);
listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, 0);
listView.setAdapter(listAdapter);
btADapter = BluetoothAdapter.getDefaultAdapter();
pairedDevices = new ArrayList<String>();
filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
devices = new ArrayList<BluetoothDevice>();
receiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
boolean yaEstaListado = false;
//Si encuentro uno, me fijo is ya esta en la lista de paireds
for (int j = 0; j < pairedDevices.size(); j++) {
if (device.getName().equals(pairedDevices.get(j))) {
yaEstaListado = true;
break;
}
}
if(!yaEstaListado){
listAdapter.add(device.getName() + "\n" + device.getAddress());
devices.add(device);
}
} else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
} else if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
if (btADapter.getState() == btADapter.STATE_OFF) {
turnOnBT();
}
}
}
};
registerReceiver(receiver, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
registerReceiver(receiver, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(receiver, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(receiver, filter);
}
private void startDiscovery() {
btADapter.cancelDiscovery();
btADapter.startDiscovery();
}
public void buscarDispositivo(View view){
startDiscovery();
}
private void turnOnBT() {
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, 1);
}
private void getPairedDevices() {
devicesArray = btADapter.getBondedDevices();
if (devicesArray.size() > 0) {
for (BluetoothDevice device : devicesArray) {
pairedDevices.add(device.getName());
listAdapter.add(device.getName() + " (Paired) " + "\n" + device.getAddress());
devices.add(device);
}
}
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(receiver);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Bluetooth debe estar encendido", Toast.LENGTH_SHORT).show();
finish();
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
try {
if(btADapter.isDiscovering()){
btADapter.cancelDiscovery();
}
BluetoothDevice selectedDevice = devices.get(position);
ConnectThread connect = new ConnectThread(selectedDevice);
connect.start();
} catch (Exception e) {
System.out.println(e);
}
}
public void enviarMensaje(View view){
String s = "Carbonero querido";
connectedThread.write(s.getBytes());
}
private class ConnectThread extends Thread {
private BluetoothSocket mmSocket = null;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) throws NoSuchMethodException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
// 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 {
// MY_UUID is the app's UUID string, also used by the server code
mmSocket = mmDevice.createRfcommSocketToServiceRecord(MY_UUID);
//Method m = mmDevice.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
//mmSocket = (BluetoothSocket) m.invoke(mmDevice, 1);
} catch (IOException e) { }
}
public void run() {
// Cancel discovery because it will slow down the connection
btADapter.cancelDiscovery();
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
Thread.sleep(2000);
mmSocket.connect();
mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
} catch (IOException connectException) {
System.out.println(connectException);
// Unable to connect; close the socket and get out
try {
mmSocket.close();
} catch (IOException closeException) {
}
return;
} catch (InterruptedException e) {
e.printStackTrace();
} catch (Exception e) {
System.out.println(e);
}
}
/** Will cancel an in-progress connection, and close the socket */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
}
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[1024]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI activity
mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
break;
}
}
}
/* Call this from the main activity to send data to the remote device */
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) { }
}
/* Call this from the main activity to shutdown the connection */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
}
I saw some answers and i think i was not clear. Now with this code i cant connect two devices and send data from client to server and backwards. The second part of the problem is that i dont have any idea how can i manage 3 connections from server side. Give me some ideas, examples...
I have 4 questions:
1) I need to create a thread so I can accept more than one device because now is accepting one and the main thread is freeze when I do socket.accept();
2) Sometimes de connections works fine but sometimes no. If you see the code, I show a message in both devices when connect, sometimes appears in one and sometimes appears in the other.
3) When I have a connection, when I try to send a message, this is not working. I don’t know if I have to create a ConnectionThread in the client and in the server, I create in both but when im going to write in client side, connectionThread is null.
4) How can I manage 3 threads from server, one for each client?
I hope I was clear… Some names are in Spanish.
Greets.
