请在flutter中设计蓝牙控制界面，有设备列表，设备查找进度显示，控制按钮，通讯框；并且在app启动时申请蓝牙权限

好的，以下是一个简单的 Flutter 蓝牙控制界面示例，其中包含设备列表，设备查找进度显示，控制按钮和通讯框。同时，在 app 启动时会申请蓝牙权限：

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

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Bluetooth Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'Flutter Bluetooth Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  FlutterBlue flutterBlue = FlutterBlue.instance;
  StreamSubscription<ScanResult> scanSubscription;
  bool isScanning = false;
  List<ScanResult> deviceList = [];
  BluetoothDevice connectedDevice;
  BluetoothCharacteristic characteristic;
  TextEditingController controller = new TextEditingController();
  List<String> logs = [];

  @override
  void initState() {
    super.initState();
    // 请求蓝牙权限
    FlutterBlue.instance.requestPermission().then((result) {
      if (result == true) {
        print("蓝牙权限已授予");
      } else {
        print("蓝牙权限未授予");
      }
    });
  }

  @override
  void dispose() {
    scanSubscription?.cancel();
    super.dispose();
  }

  void startScan() {
    setState(() {
      isScanning = true;
      deviceList.clear();
    });
    scanSubscription = flutterBlue.scan().listen((scanResult) {
      setState(() {
        deviceList.add(scanResult);
      });
    });
    new Timer(const Duration(seconds: 10), () {
      stopScan();
    });
  }

  void stopScan() {
    scanSubscription?.cancel();
    setState(() {
      isScanning = false;
    });
  }

  void connectToDevice(BluetoothDevice device) async {
    stopScan();
    setState(() {
      connectedDevice = device;
    });
    await device.connect();
    List<BluetoothService> services = await device.discoverServices();
    services.forEach((service) {
      service.characteristics.forEach((c) {
        if (c.uuid.toString() == "your_characteristic_uuid_here") {
          characteristic = c;
        }
      });
    });
    setState(() {
      logs.add("连接到设备 ${device.name} 成功");
    });
  }

  void disconnectFromDevice() async {
    if (connectedDevice != null) {
      await connectedDevice.disconnect();
      setState(() {
        connectedDevice = null;
        characteristic = null;
        logs.add("已断开连接");
      });
    }
  }

  void sendCommand(String command) async {
    if (connectedDevice != null && characteristic != null) {
      List<int> bytes = utf8.encode(command);
      await characteristic.write(bytes);
      setState(() {
        logs.add("发送命令：$command");
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(title: new Text(widget.title)),
      body: new Column(
        children: <Widget>[
          // 设备列表
          new Expanded(
            child: new ListView.builder(
              itemCount: deviceList.length,
              itemBuilder: (BuildContext context, int index) {
                ScanResult result = deviceList[index];
                return new ListTile(
                  title: new Text(result.device.name ?? "未知设备"),
                  subtitle: new Text(result.device.id.toString()),
                  onTap: () {
                    connectToDevice(result.device);
                  },
                );
              },
            ),
          ),
          // 设备查找进度显示
          new Container(
            padding: EdgeInsets.all(16.0),
            child: new Row(
              children: <Widget>[
                new Text(
                  isScanning ? "正在查找设备..." : "查找已停止",
                  style: new TextStyle(fontSize: 18.0),
                ),
                new Spacer(),
                isScanning
                    ? new CircularProgressIndicator()
                    : new Container(),
              ],
            ),
          ),
          // 控制按钮
          new Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: <Widget>[
              new RaisedButton(
                child: new Text("打开"),
                onPressed: () {
                  sendCommand("open");
                },
              ),
              new RaisedButton(
                child: new Text("关闭"),
                onPressed: () {
                  sendCommand("close");
                },
              ),
              new RaisedButton(
                child: new Text("断开连接"),
                onPressed: () {
                  disconnectFromDevice();
                },
              ),
            ],
          ),
          // 通讯框
          new Expanded(
            child: new ListView.builder(
              itemCount: logs.length,
              itemBuilder: (BuildContext context, int index) {
                String log = logs[index];
                return new ListTile(
                  title: new Text(log),
                );
              },
            ),
          ),
        ],
      ),
      floatingActionButton: new FloatingActionButton(
        child: isScanning ? new Icon(Icons.stop) : new Icon(Icons.search),
        onPressed: () {
          if (isScanning) {
            stopScan();
          } else {
            startScan();
          }
        },
      ),
    );
  }
}

请注意，上述代码仅用于演示目的，并且需要您根据自己的需求进行修改和优化。此外，您需要在 pubspec.yaml 文件中添加以下依赖项：

dependencies:
  flutter:
    sdk: flutter
  flutter_blue: ^0.7.3+1

这是使用 FlutterBlue 插件进行蓝牙操作所必需的依赖项。