新年第一篇。

最近在做蓝牙开锁的小项目，手机去连接单片机总是出现问题，和手机的连接也不稳定，看了不少蓝牙方面的文档，做了个关于蓝牙连接的小结。

在做android蓝牙串口连接的时候一般会使用

BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {Log.e(TAG, "create() failed", e);
}

然后是tmp赋给BluetoothSocket,接着调用connect方法进行蓝牙设备的连接。

可是 BluetoothSocket 的connect方法本身就会报很多异常错误。

以下根据对蓝牙开发的一点研究可通过以下方法解决：

方法1.先进行蓝牙自动配对，配对成功，通过UUID获得BluetoothSocket,然后执行connect()方法。

方法2.通过UUID获得BluetoothSocket,然后先根据mDevice.getBondState()进行判断是否需要配对，最后执行connnect()方法。

 

    private class ConnectThread extends Thread {String macAddress = "";public ConnectThread(String mac) {macAddress = mac;}public void run() {connecting = true;connected = false;if(mBluetoothAdapter == null){mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();}mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(macAddress);mBluetoothAdapter.cancelDiscovery();try {socket = mBluetoothDevice.createRfcommSocketToServiceRecord(uuid);} catch (IOException e) {// TODO Auto-generated catch block//e.printStackTrace();Log.e(TAG, "Socket", e);}             //adapter.cancelDiscovery();while (!connected && connetTime <= 10) {                connectDevice();}// 重置ConnectThread //synchronized (BluetoothService.this) {//ConnectThread = null;//}}public void cancel() {try {socket.close();socket = null;} catch (Exception e) {e.printStackTrace();} finally {connecting = false;}}}

接下来是调用的连接设备方法connectDevice():

protected void connectDevice() {  try {  // 连接建立之前的先配对  if (mBluetoothDevice.getBondState() == BluetoothDevice.BOND_NONE) {  Method creMethod = BluetoothDevice.class  .getMethod("createBond");  Log.e("TAG", "开始配对");  creMethod.invoke(mBluetoothDevice);  } else {  }  } catch (Exception e) {  // TODO: handle exception  //DisplayMessage("无法配对！");  e.printStackTrace();  }  mBluetoothAdapter.cancelDiscovery();  try {  socket.connect();  //DisplayMessage("连接成功!"); //connetTime++;connected = true;} catch (IOException e) {  // TODO: handle exception  //DisplayMessage("连接失败！");connetTime++;connected = false;try {  socket.close();socket = null;} catch (IOException e2) {  // TODO: handle exception  Log.e(TAG, "Cannot close connection when connection failed");  }  } finally {connecting = false;}  }

 

方法3.利用反射通过端口获得BluetoothSocket,然后执行connect()方法。

    private class ConnectThread extends Thread {String macAddress = "";public ConnectThread(String mac) {macAddress = mac;}public void run() {connecting = true;connected = false;if(mBluetoothAdapter == null){mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();}mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(macAddress);mBluetoothAdapter.cancelDiscovery();initSocket();                         //adapter.cancelDiscovery();while (!connected && connetTime <= 10) {try {socket.connect();connected = true;} catch (IOException e1) {connetTime++;connected = false;// 关闭 sockettry {socket.close();socket = null;} catch (IOException e2) {//TODO: handle exception  Log.e(TAG, "Socket", e2);}} finally {connecting = false;}//connectDevice();}// 重置ConnectThread //synchronized (BluetoothService.this) {//ConnectThread = null;//}}public void cancel() {try {socket.close();socket = null;} catch (Exception e) {e.printStackTrace();} finally {connecting = false;}}}

接下来是初始化并得到BluetoothSocket的方法

/*** 取得BluetoothSocket*/private void initSocket() {BluetoothSocket temp = null;try {            Method m = mBluetoothDevice.getClass().getMethod("createRfcommSocket", new Class[] { int.class });temp = (BluetoothSocket) m.invoke(mBluetoothDevice, 1);//这里端口为1            } catch (SecurityException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}socket = temp;}

 

要点：1.蓝牙配对和连接是两回事，不可混为一谈。

　　　2.蓝牙串口连接可通过端口 （1-30）和UUID两种方法进行操作。

　　　3.通过UUID进行蓝牙连接最好先进行配对操作。

 

作者：jason0539

博客：http://blog.csdn.net/jason0539（转载请说明出处）

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