Tôi đã cố gắng kết nối hai thiết bị bằng cách sử dụng ví dụ Trò chuyện qua Bluetooth trên Android dành cho nhà phát triển Android. Nó chỉ kết nối từ một trong các thiết bị và khi tôi đang cố gắng kết nối từ thiết bị khác, nó không kết nối và bật lên một thông báo "Không thể kết nối: [tên thiết bị ở đây]"không thể kết nối giữa 2 thiết bị bluetooth android
Tôi tự hỏi mình có đang sử dụng không cùng một mã trên cả hai thiết bị, tại sao kết nối chỉ được thực hiện từ một phía và bị từ chối từ phía bên kia?
Tôi có 2 thiết bị - 1 đang chạy phiên bản 2.2 và 1 đang chạy v2.3.3. Yêu cầu của tôi luôn được gửi từ Galaxy Y chạy 2.3.3 đến Galaxy Fit-v chạy Android 2.2, nhưng không phải ngược lại. bất cứ ai có thể vui lòng giúp tôi ra hoặc cho tôi gợi ý dựa trên mã dưới đây ...
@Override
public void onActivityResult(int requestCode, int resultCode, final Intent data) {
switch (requestCode) {
case REQUEST_CONNECT_DEVICE:
// When DeviceListActivity returns with a device to connect
if (resultCode == Activity.RESULT_OK) {
FaceCardList.requestConnection = true;
FaceCardList.deviceSelected = false;
address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
device = FaceCardList.mBluetoothAdapter.getRemoteDevice(address);
// Attempt to connect to the device
FaceCardList.mChatService.connect(device);
// Get the device MAC address
}
break;
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
if (resultCode == Activity.RESULT_OK) {
// Bluetooth is now enabled, so set up a chat session
setupChat();
} else {
// User did not enable Bluetooth or an error occured
Toast.makeText(this, R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show();
finish();
}
}
}
và mã cho dịch vụ BluetoothChat của tôi là:
public class BluetoothChatService extends Activity {
private static final String TAG = "BluetoothChatService";
private static final boolean D = true;
// Name for the SDP record when creating server socket
private static final String NAME = "BluetoothChat";
// Unique UUID for this application
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// ("fa87c0d0-afac-11de-8a39-0800200c9a66");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
/**
* Constructor. Prepares a new BluetoothChat session.
*
* @param context
* The UI Activity Context
* @param handler
* A Handler to send messages back to the UI Activity
*/
public BluetoothChatService(Context context, Handler handler) {
mAdapter = FaceCardList.mBluetoothAdapter;
mState = STATE_NONE;
mHandler = handler;
}
/**
* Set the current state of the chat connection
*
* @param state
* An integer defining the current connection state
*/
private synchronized void setState(int state) {
if (D) {
//Log.d(TAG, "setState() " + mState + " -> " + state);
}
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(FaceCardList.MESSAGE_STATE_CHANGE, state, -1)
.sendToTarget();
}
/**
* Return the current connection state.
*/
public synchronized int getState() {
return mState;
}
/**
* Start the chat service. Specifically start AcceptThread to begin a
* session in listening (server) mode. Called by the Activity onResume()
*/
public synchronized void start() {
if (D) {
Log.d(TAG, "start");
}
// Cancel any thread attempting to make a connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to listen on a BluetoothServerSocket
if (mAcceptThread == null) {
mAcceptThread = new AcceptThread();
mAcceptThread.start();
}
setState(STATE_LISTEN);
}
/**
* Start the ConnectThread to initiate a connection to a remote device.
*
* @param device
* The BluetoothDevice to connect
*/
public synchronized void connect(BluetoothDevice device) {
if (D) {
Log.d(TAG, "connect to: " + device);
}
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(STATE_CONNECTING);
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
*
* @param socket
* The BluetoothSocket on which the connection was made
* @param device
* The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket,
BluetoothDevice device) {
if (D) {
Log.d(TAG, "######connected");
}
// Cancel the thread that completed the connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Cancel the accept thread because we only want to connect to one
// device
if (mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(FaceCardList.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(FaceCardList.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
/**
* Stop all threads
*/
public synchronized void stop() {
if (D) {
Log.d(TAG, "stop");
}
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
setState(STATE_NONE);
}
/**
* Write to the ConnectedThread in an unsynchronized manner
*
* @param out
* The bytes to write
* @see ConnectedThread#write(byte[])
*/
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED) {
return;
}
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
/**
* Indicate that the connection attempt failed and notify the UI Activity.
*/
private void connectionFailed() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(FaceCardList.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(FaceCardList.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
/**
* Indicate that the connection was lost and notify the UI Activity.
*/
private void connectionLost() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(FaceCardList.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(FaceCardList.TOAST, "Device connection was lost");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
/**
* This thread runs while listening for incoming connections. It behaves
* like a server-side client. It runs until a connection is accepted (or
* until cancelled).
*/
private class AcceptThread extends Thread {
// The local server socket
private final BluetoothServerSocket mmServerSocket;
public AcceptThread() {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
tmp = mAdapter
.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
// if(!tmp.toString().equalsIgnoreCase(null)){
//
// }
} catch (IOException e) {
//Log.e(TAG, "listen() failed", e);
}
mmServerSocket = tmp;
}
@Override
public void run() {
if (D) {
Log.d(TAG, "BEGIN mAcceptThread" + this);
}
setName("AcceptThread");
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != STATE_CONNECTED) {
try {
socket = mmServerSocket.accept();
} catch (IOException e1) {
// TODO Auto-generated catch block
//e1.printStackTrace();
}
// If a connection was accepted
if (socket != null) {
synchronized (BluetoothChatService.this) {
switch (mState) {
case STATE_LISTEN:
case STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice());
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate
// new socket.
//Log.e("STATE_CONNECTED: service","STATE_CONNECTED: service");
try {
socket.close();
} catch (IOException e) {
//Log.e(TAG,"Could not close unwanted socket", e);
}
break;
}
}
}
}
if (D) {
//Log.i(TAG, "END mAcceptThread");
}
}
public void cancel() {
if (D) {
//Log.d(TAG, "cancel " + this);
}
try {
mmServerSocket.close();
} catch (IOException e) {
//Log.e(TAG, "close() of server failed", e);
}
}
}
/**
* This thread runs while attempting to make an outgoing connection with a
* device. It runs straight through; the connection either succeeds or
* fails.
*/
private class ConnectThread extends Thread {
private BluetoothSocket mmSocket= null;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
System.out.println("my uuid :-"+MY_UUID);
try {
try {
//tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
mmSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
System.out.println("mm socket value :-"+mmSocket);
} catch (IOException e) {
e.printStackTrace();
System.out.println("error in connecting :-"+e.getMessage());
//Log.e(TAG, "create() failed", e);
// TODO Auto-generated catch block
//e.printStackTrace();
}
} catch (SecurityException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
}
// mmSocket = tmp;
System.out.println("mm socket value as temp :-----------------");
}
@Override
public void run() {
//Log.i(TAG, "BEGIN mConnectThread");
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
System.out.println("before connection");
mmSocket.connect();
System.out.println("after connection ");
} catch (Exception e) {
System.out.println("in connection failed :-"+e.getMessage());
connectionFailed();
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) {
//Log.e(TAG,"unable to close() socket during connection failure", e2);
}
// Start the service over to restart listening mode
try {
BluetoothChatService.this.start();
} catch (Exception e2) {
// TODO: handle exception
e2.printStackTrace();
System.out.println("in connection failed start bluetooth chat service :-"+e2.getMessage());
}
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothChatService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
//Log.e(TAG, "close() of connect socket failed", e);
}
}
}
/**
* This thread runs during a connection with a remote device. It handles all
* incoming and outgoing transmissions.
*/
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;
}
@Override
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 {
// Read from the InputStream\
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
// XXX !!!
String buffer2 = new String(buffer);
buffer2= buffer2.substring(0, buffer2.length()-3)+"\n";
mHandler.obtainMessage(FaceCardList.MESSAGE_READ, bytes, -1, buffer2.getBytes()).sendToTarget();
} catch (IOException e) {
//Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
}
}
/**
* 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
// XXX !!!
String buffer2 = new String(buffer);
buffer2= buffer2.substring(0, buffer2.length()-2);
mHandler.obtainMessage(FaceCardList.MESSAGE_WRITE, -1, -1,
buffer2.getBytes()).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);
}
}
}
}
Tôi bị mắc kẹt. Tại sao kết nối luôn được thực hiện từ phiên bản cao hơn sang phiên bản thấp hơn nhưng không phải từ phiên bản thấp hơn sang phiên bản cao hơn?
bạn đã có được giải pháp? – Venkat
nops? .......... :( – SRam
Tôi vừa cung cấp một tiền thưởng cho câu hỏi này, vì tôi đã gặp sự cố với Bluetooth trong quá khứ. Có vẻ như rất nhiều sự cố xuất phát từ phần cứng, sự lựa chọn của UUID, vv thay vì mã thực tế, và không có nhiều câu trả lời trên StackOverflow đã giúp tôi. Nếu bạn không nhớ làm sạch mã của bạn (đúng thụt đầu nó, vv, đó sẽ là tuyệt vời (nó sẽ thu hút nhiều người hơn nếu mã của bạn có thể đọc được) –