android開發之藍芽配對串連的方法

新年第一篇。

最近在做藍芽開鎖的小項目，手機去串連單片機總是出現問題，和手機的串連也不穩定，看了不少藍芽方面的文檔，做了個關於藍芽串連的小結。

在做android藍芽串口串連的時候一般會使用

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

然後是tmp賦給BluetoothSocket,接著調用connect方法進行藍牙裝置的串連。

可是 BluetoothSocket 的connect方法本身就會報很多異常錯誤。

以下根據對藍芽開發的一點研究可通過以下方法解決：

方法1.先進行藍芽自動配對，配對成功，通過UUID獲得BluetoothSocket,然後執行connect()方法。

方法2.通過UUID獲得BluetoothSocket,然後先根據進行判斷是否需要配對，最後執行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();            }            // 重設ConnectThread             //synchronized (BluetoothService.this) {               //ConnectThread = null;            //}        }        public void cancel() {            try {                socket.close();                socket = null;            } catch (Exception e) {                e.printStackTrace();            } finally {                connecting = false;            }        }    }

接下來是調用的串連裝置方法connectDevice():

protected void connectDevice() {          try {              // 串連建立之前的先配對              if (mBluetoothDevice.getBondState() == BluetoothDevice.BOND_NONE) {                  Method creMethod = BluetoothDevice.class                          .getMethod("createBond");                  Log.e("TAG", "開始配對");                  creMethod.invoke(mBluetoothDevice);              } else {              }          } catch (Exception e) {              // TODO: handle exception              //DisplayMessage("無法配對！");              e.printStackTrace();          }          mBluetoothAdapter.cancelDiscovery();          try {              socket.connect();              //DisplayMessage("串連成功!");             //connetTime++;            connected = true;        } catch (IOException e) {              // TODO: handle exception              //DisplayMessage("串連失敗！");            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.利用反射通過連接埠獲得BluetoothSocket,然後執行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;                    // 關閉 socket                    try {                        socket.close();                        socket = null;                    } catch (IOException e2) {                        //TODO: handle exception                          Log.e(TAG, "Socket", e2);                    }                } finally {                    connecting = false;                }                //connectDevice();            }            // 重設ConnectThread             //synchronized (BluetoothService.this) {               //ConnectThread = null;            //}        }        public void cancel() {            try {                socket.close();                socket = null;            } catch (Exception e) {                e.printStackTrace();            } finally {                connecting = false;            }        }    }

接下來是初始化並得到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);//這裡連接埠為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;    }

 

要點：1.藍芽配對和串連是兩回事，不可混為一談。

　　　2.藍芽串口串連可通過連接埠 （1-30）和UUID兩種方法進行操作。

　　　3.通過UUID進行藍芽串連最好先進行配對操作。