android 开发之 Bluetooth

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android 蓝牙串口连接代码

BluetoothSocket tmp =null;

// Get a BluetoothSocket for a connection with the
// given BluetootDevice

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的方法本身会报很多异常错误
   以下根据对蓝牙的一点研究可以通过一下方法解决：
   1.先进行蓝牙自动配对，配对成功，通过BluetoothSocket,然

后执行connect()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

connect() 方法。

蓝牙连接线程

private class ConnectThread extends Thread
{
String macAddrss="";
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}

Log.e(TAG, "Socket", e);

}
while(!connected && connetTime<=10)
{
connectDevice();
}

public void cancel()

{
    try{
     socket.close();
      socket=null;

}catch(Exception e)
{
e.printStackTrace();

}finally{
connecting=false;

}

接下来是调用的是连接设备的方法 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");

creMethod.invoke(mBluetoothDevice);

}else{

}

}catch(Exception e) {
            // TODO: handle exception
            //DisplayMessage("无法配对！");
            e.printStackTrace();

}

mBluetoothAdapter.cancelDiscovery();

     try{
     socket.connet();
//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。

    /**     * <p>     * 蓝牙连接线程     * </p>     *      * @author lsw     *      */    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

    /**     * 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。

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