flutter设计一个蓝牙控制页面，并写出代码，说明需要添加的依赖控件

好的，下面是Flutter设计蓝牙控制页面的代码。在此之前，需要安装flutter_blue插件来实现蓝牙的连接和控制。

import 'package:flutter/material.dart';
import 'package:flutter_blue/flutter_blue.dart';

class BluetoothControlPage extends StatefulWidget {
  BluetoothControlPage({Key key}) : super(key: key);

  @override
  _BluetoothControlPageState createState() => _BluetoothControlPageState();
}

class _BluetoothControlPageState extends State<BluetoothControlPage> {
  FlutterBlue flutterBlue = FlutterBlue.instance;
  BluetoothDevice device;
  BluetoothCharacteristic characteristic;

  String _deviceName = '';

  bool _isConnected = false;
  bool _isStopped = true;

  TextEditingController _textEditingController = TextEditingController();

  @override
  void initState() {
    super.initState();

    // 扫描蓝牙设备
    flutterBlue.scanResults.listen((results) {
      for (ScanResult result in results) {
        if (result.device.name == 'YOUR_DEVICE_NAME') {
          setState(() {
            device = result.device;
            _deviceName = device.name;
          });

          break;
        }
      }
    });

    // 开始扫描
    flutterBlue.startScan(timeout: Duration(seconds: 4));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('蓝牙控制'),
      ),
      body: Container(
        padding: EdgeInsets.all(16),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              '设备名称：$_deviceName',
              style: TextStyle(fontSize: 18),
            ),
            SizedBox(height: 16),
            RaisedButton(
              child: Text(_isConnected ? '断开连接' : '连接设备'),
              onPressed: _isConnected ? _disconnect : _connect,
            ),
            SizedBox(height: 16),
            TextFormField(
              controller: _textEditingController,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: '发送内容',
              ),
            ),
            SizedBox(height: 16),
            RaisedButton(
              child: Text(_isStopped ? '发送' : '停止发送'),
              onPressed: _isConnected ? _sendData : null,
            ),
          ],
        ),
      ),
    );
  }

  // 连接设备
  void _connect() async {
    if (device == null) return;

    await device.connect();

    List<BluetoothService> services = await device.discoverServices();

    services.forEach((service) {
      service.characteristics.forEach((characteristic) {
        if (characteristic.uuid.toString() == 'YOUR_CHARACTERISTIC_UUID') {
          setState(() {
            this.characteristic = characteristic;
            _isConnected = true;
          });
        }
      });
    });
  }

  // 断开连接
  void _disconnect() async {
    await device.disconnect();

    setState(() {
      _isConnected = false;
      _isStopped = true;
    });
  }

  // 发送数据
  void _sendData() async {
    if (_textEditingController.text.isEmpty) return;

    if (_isStopped) {
      setState(() {
        _isStopped = false;
      });

      while (!_isStopped) {
        await characteristic.write(_textEditingController.text.codeUnits);
        await Future.delayed(Duration(milliseconds: 100));
      }
    } else {
      setState(() {
        _isStopped = true;
      });
    }
  }
}

需要添加的依赖控件有：

- flutter_blue: 实现蓝牙连接和控制；
- TextFormField: 输入框控件。