Bluetooth篇 开发实例之九 和蓝牙模块通信

首先，我们要去连接蓝牙模块，那么，我们只要写客户端的程序就好了，蓝牙模块就相当于服务端。

连接就需要UUID。

#蓝牙串口服务
SerialPortServiceClass_UUID = ‘{00001101-0000-1000-8000-00805F9B34FB}’

private UUID mUuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

第一步：

首先要连接设备。这个参考Android Developer的例子来写：Android Developer -- Bluetooth篇 开发实例之二 连接设备

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(MY_UUID);
        } 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) { }
    }
}

代码：

    /**
     * 蓝牙客户端程序Socket，链接蓝牙服务器
     *
     * @author THINK
     *
     */
    private class BtClientThread extends Thread {
        private BluetoothSocket btSocket; // 链接的Socket
        private BluetoothAdapter btAdapter; // 蓝牙适配器，构造方法传入该值

        /**
         * 构造方法
         *
         * @param bluetoothAdapter
         * @param btDevice
         * @param uuid
         */
        public BtClientThread(BluetoothAdapter btAdapter, BluetoothDevice btDevice, UUID uuid) {
            BluetoothSocket tmp = null;
            this.btAdapter = btAdapter;
            try {
                tmp = btDevice.createRfcommSocketToServiceRecord(uuid);
            } catch (IOException e) {
                Log.d("h_bl", "BtClientThread不能获取到BluetoothSocket");
                e.printStackTrace();
            }
            btSocket = tmp;
        }

        /**
         * 启动子线程去链接
         */
        public void run() {
            Log.d("h_bl", "BtClientThread进入线程");
            // 链接时，蓝牙适配器要先取消搜索
            btAdapter.cancelDiscovery();
            try {
                // 通过socket链接设备时，会阻塞线程，直到成功，或者抛出异常。
                btSocket.connect();
            } catch (IOException connectException) {
                Log.d("h_bl", "BtClientThread通过socket链接设备失败");
                // 不能链接设备时，就关闭socket的，并退出。
                try {
                    btSocket.close();
                } catch (IOException closeException) {
                    Log.d("h_bl", "BtClientThread不能正常关闭socket");
                }
                return;
            }
            // Do work to manage the connection (in a separate thread)
            bConnectedThread = new BTConnectedThread(btSocket); // 当链接上蓝牙服务时
            bConnectedThread.start();
            Log.d("h_bl", "BtClientThread连接上设备了");
        }

        /**
         * 将取消正在进行的连接,并关闭套接字
         */
        public void cancel() {
            try {
                btSocket.close();
            } catch (IOException e) {
            }
        }
    }

第二步：

管理连接。这个参考Android Developer的例子来写：Android Developer -- Bluetooth篇 开发实例之三 管理连接

private class ConnectedThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        byte[] buffer = new byte[1024];  // buffer store for the stream
        int bytes; // bytes returned from read()

        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.read(buffer);
                // Send the obtained bytes to the UI Activity
                mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                        .sendToTarget();
            } catch (IOException e) {
                break;
            }
        }
    }

    /* Call this from the main Activity to send data to the remote device */
    public void write(byte[] bytes) {
        try {
            mmOutStream.write(bytes);
        } catch (IOException e) { }
    }

    /* Call this from the main Activity to shutdown the connection */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

代码：

   /**
     * 蓝牙连接线程
     *
     * @author THINK
     *
     */
    private class BTConnectedThread extends Thread {
        private BluetoothSocket mmSocket;
        private InputStream mmInStream;
        private OutputStream mmOutStream;

        public BTConnectedThread(BluetoothSocket socket) {
            mmSocket = socket;
            InputStream tmpIn = null;
            OutputStream tmpOut = null;
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) {
                Log.d("h_bl", "socket.getInputStream()或者socket.getOutputStream()异常");
            }
            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            Log.d("h_bl", "run()");
            byte[] buffer = new byte[30]; // buffer store for the stream
            int bytes; // bytes returned from read()
            // 读程序要一直开启，死循环
            while (true) {
                Log.d("h_bl", "run()2");
                try {
                    Log.d("h_bl", "run()3");
                    // Read from the InputStream
                    bytes = mmInStream.read(buffer);
                    Log.d("h_bl", "返回的数据的长度为" + bytes);
                    String readString = new String(buffer);
                    Log.d("h_bl", "返回的数据为" + readString);
                    //这边需要在处理
                } catch (IOException e) {
                    break;
                }
            }
        }

        /* Call this from the main Activity to send data to the remote device */
        public void write(byte[] bytes) {
            try {
                mmOutStream.write(bytes);
                //如果在用流的时候,没有用flush()这个方法,很多情况下会出现流的另一边读不到数据的问题,特别是在数据特别小的情况下
                mmOutStream.flush();
            } catch (IOException e) {
            }
        }

        /* Call this from the main Activity to shutdown the connection */
        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) {
            }
        }
    }

以上，写不好，扩展性太差，有些，该判断的没有判断。

需要参考Bluetooth Chat sample app来写。

UUID参考地址:http://blog.csdn.net/wletv/article/details/8957612