您好我需要将3个不同的设备（客户端）连接到第四个设备（服务器）。 这是我的服务器代码：
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) { }
}
}
}
这是我的客户代码：
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) { }
}
}
}
我看到了一些答案，我想我不清楚。现在使用此代码，我无法连接两个设备并将数据从客户端发送到服务器并向后发送。问题的第二部分是我不知道如何从服务器端管理3个连接。给我一些想法，例子......
我有4个问题：
1）我需要创建一个线程，所以我可以接受多个设备，因为现在接受一个，当我执行socket.accept（）时，主线程被冻结。
2）有时de连接工作正常但有时没有。如果您看到代码，我会在连接时在两个设备中显示一条消息，有时会出现在另一个设备中，有时会出现在另一个设备中。
3）当我有连接时，当我尝试发送消息时，这不起作用。我不知道是否必须在客户端和服务器中创建ConnectionThread，我在两者中创建但是当我要在客户端写入时，connectionThread为null。
4）如何从服务器管理3个线程，每个客户端一个？
我希望我很清楚......有些名字是西班牙语。
电贺。
答案 0 :(得分：0)
您一次只能在两台设备之间进行通信。
如果您尝试使用此代码与第三个设备通信，则无法使用。
要在两个以上的设备之间进行通信，您需要在开始与客户端2进行通信之前结束与客户端1的通信。这将需要更多代码来以任何方式管理您的连接，无论您是否希望将它们放入某种排队。
这取决于您是想自动进行通信，还是手动启动和停止设备之间的通信，以了解如何管理。
您可以遍历可发现的设备并启动和停止连接。这将涉及为您的蓝牙服务器调用和管理您的线程，以便关闭套接字并为每个新连接发生等待新连接的新情况。
这意味着您需要跟踪哪个设备已连接以及哪个设备将在队列中接下来，并且在服务器准备好接受来自此设备的连接时进行错误处理以检查设备是否可用。由于确保了设备的可用性，它相当复杂并容易出错，因此您需要仔细检查代码并确保在服务器准备就绪时为设备提供服务，因此允许服务器循环到下一个可用的设备。
因此，在服务器代码的情况下，基本连接和线程管理与连接到一个客户端的相同，但是这由您的代码调用和管理以循环通过客户端设备，或者手动停止与一个客户端设备的通信设备并尝试与其他设备连接。
无论您是尝试遍历多个客户端设备还是只处理一个客户端，客户端代码都不必更改。处理此类代码需要在服务器代码中进行管理。
首先，您需要清楚地了解如何在两个设备之间进行通信，我不清楚您是否知道如何执行此操作。