Android中连接蓝牙设备时遇到createRfcommSocketToServiceRecord的UUID问题和BluetoothSocket的connect失败

【问题】

折腾：

期间，参考：

Bluetooth | Android Developers – ManagingAConnection

参考“Connecting as a client”中的：

tmp = device.createRfcommSocketToServiceRecord(MY_UUID);

遇到UUID不懂的问题。

然后随便去

http://www.guidgenerator.com/online-guid-generator.aspx

弄了个UUID：

e214d9ae-c3ba-4e25-abb5-299041353bc3

结果运行到：

            try {

                // Connect the device through the socket. This will block

                // until it succeeds or throws an exception

                mmSocket.connect();

            } catch (IOException connectException) {

                // Unable to connect; close the socket and get out

                try {

                    mmSocket.close();

                } catch (IOException closeException) { }

                return;

            }

中的：

mmSocket.connect();

时就抛异常了。

即：

遇到createRfcommSocketToServiceRecord的UUID不懂，以及BluetoothSocket的connect失败。

【解决过程】

1.参考：

android – Why can’t HTC Droid running OTA 2.1 communicate with RFCOMM? – Stack Overflow

去试试：

Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class});

mBTSocket = (BluetoothSocket) m.invoke(device, 1);

结果看着就不太对啊。。就不继续试了。

2.参考：

Need Bluetooth UUID clarification – Google Groups

去试试：

00001101-0000-1000-8000-00805F9B34FB

结果直接挂掉。

3.再去试试：

00000003-0000-1000-8000-00805F9B34FB

也会挂掉。

4.后来再去搜：

android bluetooth connect fail

然后去参考：

android bluetooth can’t connect – Stack Overflow

和：

The Missing Manual: Android Bluetooth RFCOMM « Wires Are Obsolete

去试试，用代码：

 // Create a BroadcastReceiver for ACTION_FOUND

 private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

     public void onReceive(Context context, Intent intent) {

//	 BluetoothDevice deviceExtra = intent.getParcelableExtra("android.bluetooth.device.extra.DEVICE");

//	 Parcelable[] uuidExtra = intent.getParcelableArrayExtra("android.bluetooth.device.extra.UUID");

         String action = intent.getAction();

         // When discovery finds a device

         if (BluetoothDevice.ACTION_FOUND.equals(action)) {

             // Get the BluetoothDevice object from the Intent

             BluetoothDevice btDev = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

             Parcelable[] btDevUuid = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);

调试得到的btDevUuid都是null的。

5.换用：

         if (BluetoothDevice.ACTION_FOUND.equals(action)) {

             // Get the BluetoothDevice object from the Intent

             BluetoothDevice btDev = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

             //Parcelable[] btDevUuid = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);

             UUID btDevUuid = intent.getParcelableExtra(BluetoothDevice.EXTRA_UUID);

还是不行。

6.参考：

Issue 15919 – android – Bluetooth connect fails under 2.3.3 for SPP devices using secure comms

中提到的：

BluetoothDevice | Android Developers

中提示的：

Hint: If you are connecting to a Bluetooth serial board then try using the well-known SPP UUID 00001101-0000-1000-8000-00805F9B34FB. However if you are connecting to an Android peer then please generate your own unique UUID.

所以再去试试这个UUID：

00001101-0000-1000-8000-00805F9B34FB

最终是可以了：

对应的相关代码为：

 private String mactekHartModemName;

 private UUID mactekHartModemUuid;

 //void afterFoundBtHartModem(BluetoothDevice btDev, Parcelable[] btDevUuid){

 void afterFoundBtHartModem(BluetoothDevice btDev, UUID btDevUuid){

  if(null != btDevUuid){

  }

     //mactekHartModemName = btDev.getName(); //"MACTekViator75FE"

     //mactekHartModemUuid = UUID.fromString(mactekHartModemName);

  String uuidValue;

  //http://www.guidgenerator.com/online-guid-generator.aspx

  //uuidValue = "e214d9ae-c3ba-4e25-abb5-299041353bc3";

  //https://groups.google.com/forum/#!topic/android-developers/vyTEJOXELos

  //uuidValue = "00001101-0000-1000-8000-00805F9B34FB";

  //uuidValue = "00000003-0000-1000-8000-00805F9B34FB";

  uuidValue = "00001101-0000-1000-8000-00805F9B34FB";

  mactekHartModemUuid = UUID.fromString(uuidValue);

     ConnectThread connectBtThread = new ConnectThread(btDev);

     connectBtThread.start();

 }

    private class ConnectThread extends Thread {

        private final BluetoothSocket mmSocket;

        private final BluetoothDevice mmDevice;

        public ConnectThread(BluetoothDevice device) {

            // 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

                tmp = device.createRfcommSocketToServiceRecord(mactekHartModemUuid);//00001101-0000-1000-8000-00805F9B34FB

            } catch (IOException e) { }

            mmSocket = tmp;

        }

        public void run() {

            // Cancel discovery because it will slow down the connection

            mBluetoothAdapter.cancelDiscovery();

            try {

                // Connect the device through the socket. This will block

                // until it succeeds or throws an exception

                mmSocket.connect();

            } catch (IOException connectException) {

                // Unable to connect; close the socket and get out

                try {

                    mmSocket.close();

                } catch (IOException closeException) { }

                return;

            }

            // 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();

            } catch (IOException e) { }

        }

    }

【总结】

此处，必须使用Android的SSP（协议栈默认）的UUID：

00001101-0000-1000-8000-00805F9B34FB

巴特西

Android中连接蓝牙设备时遇到createRfcommSocketToServiceRecord的UUID问题和BluetoothSocket的connect失败

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