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。