【问题】
折腾：
【记录】编写Android中的蓝牙模块驱动和底层HART设备
期间，参考：
Bluetooth | Android Developers – ManagingAConnection
参考“Connecting as a client”中的：
1 | 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：
1 2 3 4 5 6 7 8 9 10 11 | 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：
1 | 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：
1 2 | 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：
1 2 3 4 5 6 7 8 9 10 11 12 | // 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：
1 2 3 4 5 | 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：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | 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; //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
才能正常和外部的，也是SSP串口的蓝牙设备去连接。
转载请注明：在路上 » 【已解决】Android中连接蓝牙设备时遇到createRfcommSocketToServiceRecord的UUID问题和BluetoothSocket的connect失败