使用flutter设计一个蓝牙控制界面，进入页面后，检查申请蓝牙权限，自动搜索显示蓝牙设备列表，搜搜索进度显示，有控制按钮，有通讯功能，支持空安全，请列出代码和依赖控件

好的，以下是 Flutter 设计一个蓝牙控制界面的代码和依赖控件：

依赖控件：

dependencies:
  flutter:
    sdk: flutter
  permission_handler: ^8.2.7
  flutter_blue: ^0.7.3

代码实现：

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

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

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

class _BluetoothControlPageState extends State<BluetoothControlPage> {
  final _flutterBlue = FlutterBlue.instance;
  final _scanTimeout = Duration(seconds: 10);
  late Stream<List<ScanResult>> _scanResultStream;
  bool _scanning = false;
  bool _isConnected = false;
  BluetoothDevice? _selectedDevice;
  List<BluetoothDevice> _devices = [];

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

  Future<void> _checkPermissions() async {
    final status = await Permission.bluetooth.request();
    if (!status.isGranted) {
      throw Exception('Bluetooth permission not granted');
    }
  }

  Future<void> _startScan() async {
    setState(() {
      _scanning = true;
      _devices.clear();
    });

    try {
      _scanResultStream = _flutterBlue.scan(timeout: _scanTimeout);
      await for (final scanResult in _scanResultStream) {
        setState(() {
          _devices.add(scanResult.device);
        });
      }
    } catch (e) {
      print('Scan failed: $e');
    } finally {
      setState(() {
        _scanning = false;
      });
    }
  }

  Future<void> _stopScan() async {
    _scanResultStream.drain<List<ScanResult>, void>(null);
    setState(() {
      _scanning = false;
    });
  }

  Future<void> _connectToDevice(BluetoothDevice device) async {
    setState(() {
      _selectedDevice = device;
    });

    try {
      await device.connect();
      setState(() {
        _isConnected = true;
      });
    } catch (e) {
      print('Connection failed: $e');
    }
  }

  Future<void> _disconnectFromDevice(BluetoothDevice device) async {
    try {
      await device.disconnect();
      setState(() {
        _isConnected = false;
      });
    } catch (e) {
      print('Disconnection failed: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Bluetooth Control'),
      ),
      body: Column(
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: [
              ElevatedButton(
                onPressed: _scanning ? null : _startScan,
                child: const Text('Scan'),
              ),
              ElevatedButton(
                onPressed: _scanning ? _stopScan : null,
                child: const Text('Stop'),
              ),
            ],
          ),
          const SizedBox(height: 16),
          Expanded(
            child: ListView.builder(
              itemCount: _devices.length,
              itemBuilder: (context, index) {
                final device = _devices[index];
                return ListTile(
                  title: Text(device.name ?? 'Unknown'),
                  subtitle: Text(device.id.toString()),
                  trailing: _selectedDevice == device
                      ? const Text('Connected')
                      : null,
                  onTap: _isConnected
                      ? () => _disconnectFromDevice(device)
                      : () => _connectToDevice(device),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}

在这个页面中，我们使用了 FlutterBlue 和 PermissionHandler 插件。首先在 initState() 中检查蓝牙权限。点击 Scan 按钮会开始搜索蓝牙设备，点击 Stop 按钮会停止搜索。搜索到的设备将显示在列表中，点击设备可以连接或断开连接。