写一个android蓝牙通信的工具类

以下是一个简单的Android蓝牙通信的工具类，包含了搜索设备、连接设备、发送和接收数据的方法：

public class BluetoothUtils {
    private BluetoothAdapter bluetoothAdapter;
    private BluetoothSocket socket;
    private OutputStream outputStream;
    private InputStream inputStream;
    private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
    private static final String TAG = "BluetoothUtils";

    // 初始化蓝牙适配器
    public BluetoothUtils() {
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    }

    // 判断蓝牙是否可用
    public boolean isBluetoothAvailable() {
        if (bluetoothAdapter == null) {
            return false;
        } else {
            return true;
        }
    }

    // 打开蓝牙
    public boolean enableBluetooth() {
        if (!bluetoothAdapter.isEnabled()) {
            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            context.startActivityForResult(intent, REQUEST_ENABLE_BT);
            return true;
        } else {
            return false;
        }
    }

    // 搜索蓝牙设备
    public void searchDevices(final OnDeviceFoundListener onDeviceFoundListener) {
        final List<BluetoothDevice> devices = new ArrayList<>();
        final BroadcastReceiver receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    devices.add(device);
                    onDeviceFoundListener.onDeviceFound(device);
                }
            }
        };
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        context.registerReceiver(receiver, filter);
        bluetoothAdapter.startDiscovery();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                bluetoothAdapter.cancelDiscovery();
                context.unregisterReceiver(receiver);
                onDeviceFoundListener.onSearchComplete(devices);
            }
        }, 10000);
    }

    // 连接蓝牙设备
    public boolean connectDevice(BluetoothDevice device) {
        try {
            socket = device.createRfcommSocketToServiceRecord(MY_UUID);
            socket.connect();
            outputStream = socket.getOutputStream();
            inputStream = socket.getInputStream();
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
    }

    // 发送数据
    public void sendData(String data) {
        try {
            outputStream.write(data.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 接收数据
    public String receiveData() {
        int bytes;
        byte[] buffer = new byte[1024];
        try {
            bytes = inputStream.read(buffer);
            String data = new String(buffer, 0, bytes);
            return data;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    // 关闭连接
    public void closeConnection() {
        try {
            if (socket != null) {
                socket.close();
            }
            if (outputStream != null) {
                outputStream.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public interface OnDeviceFoundListener {
        void onDeviceFound(BluetoothDevice device);
        void onSearchComplete(List<BluetoothDevice> devices);
    }
}

使用方法：

BluetoothUtils bluetoothUtils = new BluetoothUtils();

// 搜索设备
bluetoothUtils.searchDevices(new BluetoothUtils.OnDeviceFoundListener() {
    @Override
    public void onDeviceFound(BluetoothDevice device) {
        // 搜索到设备
    }

    @Override
    public void onSearchComplete(List<BluetoothDevice> devices) {
        // 搜索完成
    }
});

// 连接设备
bluetoothUtils.connectDevice(device);

// 发送数据
bluetoothUtils.sendData(data);

// 接收数据
String data = bluetoothUtils.receiveData();

// 关闭连接
bluetoothUtils.closeConnection();