Android BLE蓝牙连接代码

以下是一个简单的 Android BLE 蓝牙连接代码示例：

private BluetoothManager bluetoothManager;
private BluetoothAdapter bluetoothAdapter;
private BluetoothDevice bluetoothDevice;
private BluetoothGatt bluetoothGatt;

// 初始化 BluetoothManager 和 BluetoothAdapter
bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
bluetoothAdapter = bluetoothManager.getAdapter();

// 扫描设备并连接
bluetoothAdapter.startLeScan(new UUID[]{MY_UUID}, mLeScanCallback);
bluetoothDevice.connectGatt(this, false, mGattCallback);

// 扫描设备的回调函数
private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {
    @Override
    public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) {
        if (device.getAddress().equals(DEVICE_ADDRESS)) {
            bluetoothDevice = device;
            bluetoothAdapter.stopLeScan(mLeScanCallback);
        }
    }
};

// 连接设备的回调函数
private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            bluetoothGatt = gatt;
            // 连接成功，开始发现服务
            bluetoothGatt.discoverServices();
        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            // 连接断开
            bluetoothGatt.close();
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            // 发现服务成功，可以开始进行操作
            BluetoothGattService service = gatt.getService(SERVICE_UUID);
            BluetoothGattCharacteristic characteristic = service.getCharacteristic(CHARACTERISTIC_UUID);
            characteristic.setValue("Hello, BLE!");
            gatt.writeCharacteristic(characteristic);
        }
    }

    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        // 写入特征值成功
    }
};

需要注意的是，此示例中的 UUID、DEVICE_ADDRESS、SERVICE_UUID 和 CHARACTERISTIC_UUID 都需要根据实际情况进行替换。