写一个androidBLE通信的工具类

以下是一个简单的Android BLE通信工具类，包含连接、发现服务、读写特征等基本操作。

public class BLEManager {

    private BluetoothManager bluetoothManager;
    private BluetoothAdapter bluetoothAdapter;
    private BluetoothGatt bluetoothGatt;
    private BluetoothGattCharacteristic characteristic;

    private Context context;
    private String targetDeviceAddress;

    public BLEManager(Context context, String targetDeviceAddress) {
        this.context = context;
        this.targetDeviceAddress = targetDeviceAddress;

        bluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
        bluetoothAdapter = bluetoothManager.getAdapter();
    }

    public void connect() {
        BluetoothDevice device = bluetoothAdapter.getRemoteDevice(targetDeviceAddress);
        bluetoothGatt = device.connectGatt(context, false, gattCallback);
    }

    public void disconnect() {
        if (bluetoothGatt != null) {
            bluetoothGatt.disconnect();
            bluetoothGatt.close();
            bluetoothGatt = null;
        }
    }

    public void writeData(byte[] data) {
        if (characteristic != null) {
            characteristic.setValue(data);
            bluetoothGatt.writeCharacteristic(characteristic);
        }
    }

    public void readData() {
        if (characteristic != null) {
            bluetoothGatt.readCharacteristic(characteristic);
        }
    }

    public void discoverServices() {
        bluetoothGatt.discoverServices();
    }

    public List<BluetoothGattService> getGattServices() {
        if (bluetoothGatt != null) {
            return bluetoothGatt.getServices();
        }
        return null;
    }

    public void setCharacteristic(String serviceUUID, String characteristicUUID) {
        if (bluetoothGatt != null) {
            BluetoothGattService service = bluetoothGatt.getService(UUID.fromString(serviceUUID));
            characteristic = service.getCharacteristic(UUID.fromString(characteristicUUID));
        }
    }

    private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {

        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            super.onConnectionStateChange(gatt, status, newState);
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                gatt.discoverServices();
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            super.onServicesDiscovered(gatt, status);
            if (status == BluetoothGatt.GATT_SUCCESS) {
                // TODO: handle service discovery success
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
            super.onCharacteristicRead(gatt, characteristic, status);
            if (status == BluetoothGatt.GATT_SUCCESS) {
                byte[] data = characteristic.getValue();
                // TODO: handle read data
            }
        }

        @Override
        public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
            super.onCharacteristicWrite(gatt, characteristic, status);
            if (status == BluetoothGatt.GATT_SUCCESS) {
                // TODO: handle write success
            }
        }
    };
}

使用示例：

BLEManager bleManager = new BLEManager(context, targetDeviceAddress);
bleManager.connect();
bleManager.discoverServices();
List<BluetoothGattService> services = bleManager.getGattServices();
bleManager.setCharacteristic(serviceUUID, characteristicUUID);
bleManager.writeData(data);
bleManager.readData();
bleManager.disconnect();