<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
//直接打开系统的蓝牙设置面板
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, 0x1);
//直接打开蓝牙
adapter.enable();
//关闭蓝牙
adapter.disable();
//打开本机的蓝牙发现功能（默认打开120秒，可以将时间最多延长至300秒）
Intent discoveryIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);//设置持续时间（最多300秒）

// 创建一个接收ACTION_FOUND广播的BroadcastReceiver
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        // 发现设备
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            // 从Intent中获取设备对象
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            // 将设备名称和地址放入array adapter，以便在ListView中显示
            mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
        }
    }
};
// 注册BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter); // 不要忘了之后解除绑定

private class AcceptThread extends Thread {     private final BluetoothServerSocket mmServerSocket,

  。

    public AcceptThread() {         // Use a temporary object that is later assigned to mmServerSocket,         // because mmServerSocket is final         BluetoothServerSocket tmp = null;         try {             // MY_UUID is the app's UUID string, also used by the client code             tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);         } catch (IOException e) { }         mmServerSocket = tmp;     } 。

    public void run() {         BluetoothSocket socket = null;         // Keep listening until exception occurs or a socket is returned         while (true) {             try {                 socket = mmServerSocket.accept();             } catch (IOException e) {                 break;             }             // If a connection was accepted             if (socket != null) {                 // Do work to manage the connection (in a separate thread)                 manageConnectedSocket(socket);                 mmServerSocket.close();                 break;             }         }     } 。

    /** Will cancel the listening socket, and cause the thread to finish */     public void cancel() {         try {             mmServerSocket.close();         } catch (IOException e) { }     } } 。

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) { }     } } 。

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) { }     } } 。