无法进行2设备的蓝牙机器人之间的连接 [英] unable to make connection between 2 device bluetooth android
本文介绍了无法进行2设备的蓝牙机器人之间的连接的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我曾尝试使用Android的蓝牙聊天的例子在Android开发者网站连接两个设备。它只能从一台设备连接，当我试图从它没有连接其他设备连接，并弹出一个消息无法连接：设备名称这里]
I have tried to connect two devices by using the Android Bluetooth Chat example on the Android developer site. It's only connecting from one of the devices and when I am trying to connect from the other device it's not connecting and pops up a message "Unable to connect: [device name here]"
我想知道如果我使用的是两个设备在同一code，为什么是连接只从一个侧面制成，并从另一端被拒绝？
I am wondering if I'm using the same code on both of the devices, why is the connection made only from one side, and being refused from the other side?
我有2个设备 - 1运行2.2版本和1个运行v2.3.3。 我的要求总是被从我的银河Y发出运行2.3.3到银河配合-V运行的是Android 2.2，而不是相反。任何一个可以请帮我或给我基于关闭code建议如下...
I have 2 devices - 1 running version 2.2 and 1 running v2.3.3. My request is always being sent from my Galaxy Y running 2.3.3 to a Galaxy fit-v running Android 2.2, but not vice versa. Can any one please help me out or give me suggestions based off the code below...
@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();
}
}
}
和code我BluetoothChat服务是：
and the code for my BluetoothChat service is:
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);
}
}
}
}
我卡住了。为什么是连接总是从高版本作了低版本但不能从低版本到一个较高的一个？
I am stuck. Why is the connection always made from the higher version to a lower version but not from the lower version to a higher one?
推荐答案
我已经这样做了，我想你会得到连接丢失的设备可发现变化的时候。请不要检查设备可发现在这两个，你可以通过code启用它。
I have done this,and i think you get connection lost when the device discoverable change. Please do check the device discoverable in both,you can enable it by code.
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,0);
startActivity(discoverableIntent);
这篇关于无法进行2设备的蓝牙机器人之间的连接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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