android开发之蓝牙配对连接的方法

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

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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。

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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():

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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。

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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 socket                 try {                     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

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/**      * 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。