Android传统蓝牙通信

通信是建立在两个设备上的，其中一个为服务端，一个为客户端。

服务端主要的任务是等待连接，客户端主动发起连接的操作

接下来先说服务端的过程

蓝牙通信的uuid是固定的

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

        register();//注册一系列的广播
        //得到蓝牙适配器
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (mBluetoothAdapter != null) {//为空表示设备不支持蓝牙功能
            if (!mBluetoothAdapter.enable()) {
                mBluetoothAdapter.enable();//打开蓝牙
            } else {
                mBluetoothAdapter.startDiscovery();//开始扫描
            }
        }

   private void register() {
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);//绑定状态的广播
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);//设备蓝牙状态的广播
        filter.addAction(BluetoothDevice.ACTION_FOUND);//发送设备的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//查找附近设备结束的广播
        filter.addAction("android.bluetooth.device.action.PAIRING_REQUEST");//配对请求的广播
        registerReceiver(mBroadcastReceiver, filter);
    }

接下来看广播接收类的操作

 protected BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            // 获取蓝牙设备
            BluetoothDevice bluetoothDevice = intent
                    .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)) {
                int state = bluetoothDevice.getBondState();
                switch (state) {
                    case BluetoothDevice.BOND_BONDED:
                        Log.e("ida", "绑定成功");
                        connect();//进行通信的代码
                        break;
                    case BluetoothDevice.BOND_BONDING:
                        Log.e("ida", "BOND_BONDING正在绑定");
                        break;
                    case BluetoothDevice.BOND_NONE:
                        break;
                }
            }
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                LogUtils.d(bluetoothDevice.getName() + "---" + bluetoothDevice.getAddress());
                if (bluetoothDevice.getName() != null) {
                    if (bluetoothDevice.getName().equals("我的")) {
                        bluetoothDevice.createBond();
                    }
                }

            }
            if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
                int blueState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);
                switch (blueState) {
                    case BluetoothAdapter.STATE_TURNING_ON:
                        break;
                    case BluetoothAdapter.STATE_ON:
                        mBluetoothAdapter.startDiscovery();
                        Log.e("dalai", "打开了蓝牙设备");
                        //startScanning();
                        break;
                    case BluetoothAdapter.STATE_TURNING_OFF:
                        break;
                    case BluetoothAdapter.STATE_OFF:
                        break;
                }
            }
            if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {
                LogUtils.d(action);
                mBluetoothAdapter.cancelDiscovery();
            }
            if (action.equals("android.bluetooth.device.action.PAIRING_REQUEST")) {//本来想写自动配对的，但pin值始终不正确，只能弹出配对框手动配对
                LogUtils.d("配对请求的广播");

                //   bluetoothDevice.setPairingConfirmation(true);//确认配对
                //  bluetoothDevice.setPin("0000".getBytes());


            }


        }


    };

    private void connect() {
        try {
            btServerSocket = mBluetoothAdapter.listenUsingRfcommWithServiceRecord("BluetoothChat", MY_UUID);
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            bluetoothSocket = btServerSocket.accept();
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (bluetoothSocket != null) {
            try {
                InputStream inputStream = bluetoothSocket.getInputStream();
                OutputStream outputStream = bluetoothSocket.getOutputStream();
                byte[] bytes = new byte[4];
                inputStream.read(bytes);
                String str = new String(bytes, "utf-8");
                inputStream.close();
                btServerSocket.close();
                Log.e("ida", "this is read---" + str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

接下来看客户端的代码

mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        Set bondedDevices = mBluetoothAdapter.getBondedDevices();
        for (BluetoothDevice device : bondedDevices) {
            if (device.getName().equals("BleServer")) {
                address = device.getAddress();
            }
        }
        if (address != null) {
            device = mBluetoothAdapter.getRemoteDevice(address);
            try {
                BluetoothSocket socket = device.createRfcommSocketToServiceRecord(MY_UUID);
                if (socket != null) {
                    socket.connect();
                    if (socket.isConnected()) {
                        Log.e("ida", "连接成功");
                        OutputStream osm = socket.getOutputStream();
                        osm.write("1234".getBytes());
                        osm.close();//及时关闭
                        socket.close();

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

这样就可以通信了，在实际应用中要服务端一般要在service中完成，还要及时关闭输入输出流以及socket连接

良好的代码规范也很重要