使用flutter设计一个蓝牙控制界面,进入页面后,检查申请代码所需的权限,自动搜索显示蓝牙设备列表,有搜索进度显示,有控制按钮,有通讯输入框和发送功能,支持空安全,请列出代码和依赖控件
时间: 2024-03-01 08:56:12 浏览: 21
好的,我会以代码的形式回答你的问题。在Flutter中实现蓝牙控制界面需要使用Flutter Blue插件。以下是一个简单的实现蓝牙控制的Flutter代码:
```dart
import 'package:flutter/material.dart';
import 'package:flutter_blue/flutter_blue.dart';
class BluetoothControlPage extends StatefulWidget {
@override
_BluetoothControlPageState createState() => _BluetoothControlPageState();
}
class _BluetoothControlPageState extends State<BluetoothControlPage> {
FlutterBlue flutterBlue = FlutterBlue.instance;
List<BluetoothDevice> devicesList = [];
BluetoothDevice connectedDevice;
bool isScanning = false;
@override
void initState() {
super.initState();
_checkPermissions();
_startScan();
}
void _checkPermissions() {
// 检查申请代码所需的权限
}
void _startScan() {
setState(() {
isScanning = true;
});
flutterBlue.startScan(timeout: Duration(seconds: 4));
flutterBlue.scanResults.listen((results) {
for (ScanResult r in results) {
if (!devicesList.contains(r.device)) {
setState(() {
devicesList.add(r.device);
});
}
}
});
flutterBlue.stopScan();
setState(() {
isScanning = false;
});
}
void _connectDevice(BluetoothDevice device) async {
await device.connect();
connectedDevice = device;
}
void _disconnectDevice() {
connectedDevice.disconnect();
connectedDevice = null;
}
void _sendMessage(String message) {
// 发送数据
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('蓝牙控制'),
),
body: Column(
children: [
// 搜索进度显示
isScanning
? CircularProgressIndicator()
: Container(),
// 蓝牙设备列表
Expanded(
child: ListView.builder(
itemCount: devicesList.length,
itemBuilder: (BuildContext context, int index) {
final device = devicesList[index];
return ListTile(
title: Text(device.name),
subtitle: Text(device.id.toString()),
trailing: connectedDevice == device
? RaisedButton(
child: Text('断开'),
onPressed: () {
_disconnectDevice();
},
)
: RaisedButton(
child: Text('连接'),
onPressed: () {
_connectDevice(device);
},
),
);
},
),
),
// 控制按钮和通讯输入框
connectedDevice == null
? Container()
: Column(
children: [
RaisedButton(
child: Text('控制按钮'),
onPressed: () {
// 控制蓝牙设备
},
),
TextField(
decoration: InputDecoration(
hintText: '请输入要发送的数据',
),
onSubmitted: (value) {
_sendMessage(value);
},
),
],
),
],
),
);
}
}
```
以上代码使用了Flutter Blue插件来实现蓝牙控制界面。其中,`_checkPermissions`函数用于检查所需权限,`_startScan`函数用于搜索蓝牙设备并显示搜索进度,`_connectDevice`函数用于连接蓝牙设备,`_disconnectDevice`函数用于断开蓝牙连接,`_sendMessage`函数用于向蓝牙设备发送数据。在界面中,使用了`CircularProgressIndicator`来显示搜索进度,使用了`ListView`来显示搜索到的蓝牙设备列表,使用了`RaisedButton`来实现控制按钮,使用了`TextField`来实现通讯输入框。
依赖控件:`flutter_blue`、`flutter/material.dart`、`flutter/widgets.dart`。其中,`flutter_blue`是Flutter Blue插件,`flutter/material.dart`和`flutter/widgets.dart`是Flutter框架中的UI控件库。