Flutter UVC摄像头控制插件uvccamera的使用

Flutter UVC摄像头控制插件uvccamera的使用

标题

UVC Camera plugin for Flutter #

内容

• GitHub Stars
• GitHub License
• Pub Version

A USB Video Class (UVC) camera plugin for Flutter based on the UVCCamera library for Android, brought to you by Alexey Pelykh.

使用

The plugin’s API is intentionally kept similar to the camera package. See the example for an app that uses the plugin.

示例代码

import 'package:flutter/material.dart';

import 'uvccamera_demo_app.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  runApp(const UvcCameraDemoApp());
}

class UvcCameraDemoApp extends StatefulWidget {
  const UvcCameraDemoApp({super.key});

  @override
  State<UvcCameraDemoApp> createState() => _UvcCameraDemoAppState();
}

class _UvcCameraDemoAppState extends State<UvcCameraDemoApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'UVC Camera Example',
      home: Scaffold(
        appBar: AppBar(
          title: const Text('UVC Camera Example'),
        ),
        body: UvcCameraDevicesScreen(),
      ),
    );
  }
}

lib/uvccamera_devices_screen.dart

import 'dart:async';

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

class UvcCameraDevicesScreen extends StatefulWidget {
  const UvcCameraDevicesScreen({super.key});

  @override
  State<UvcCameraDevicesScreen> createState() => _UvcCameraDevicesScreenState();
}

class _UvcCameraDevicesScreenState extends State<UvcCameraDevicesScreen> {
  bool _isSupported = false;
  StreamSubscription<UvcCameraDeviceEvent>? _deviceEventSubscription;
  final Map<String, UvcCameraDevice> _devices = {};

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

    UvcCamera.isSupported().then((value) {
      setState(() {
        _isSupported = value;
      });
    });

    _deviceEventSubscription = UvcCamera.deviceEventStream.listen((event) {
      setState(() {
        if (event.type == UvcCameraDeviceEventType.attached) {
          _devices[event.device.name] = event.device;
        } else if (event.type == UvcCameraDeviceEventType.detached) {
          _devices.remove(event.device.name);
        }
      });
    });

    UvcCamera.getDevices().then((devices) {
      setState(() {
        _devices.addAll(devices);
      });
    });
  }

  @override
  void dispose() {
    _deviceEventSubscription?.cancel();
    _deviceEventSubscription = null;

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (!_isSupported) {
      return const Center(
        child: Text(
          'UVC Camera is not supported on this device.',
          style: TextStyle(fontSize: 18),
        ),
      );
    }

    if (_devices.isEmpty) {
      return const Center(
        child: Text(
          'No UVC devices connected.',
          style: TextStyle(fontSize: 18),
        ),
      );
    }

    return ListView(
      children: _devices.values.map((device) {
        return ListTile(
          leading: const Icon(Icons.videocam),
          title: Text(device.name),
          subtitle: Text('Vendor ID: ${device.vendorId}, Product ID: ${device.productId}'),
          onTap: () {
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => UvcCameraDeviceScreen(device: device),
              ),
            );
          },
        );
      }).toList(),
    );
  }
}

lib/uvccamera_device_screen.dart

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

class UvcCameraDeviceScreen extends StatelessWidget {
  final UvcCameraDevice device;

  const UvcCameraDeviceScreen({super.key, required this.device});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(device.name),
      ),
      body: Center(
        child: UvcCameraWidget(device: device),
      ),
    );
  }
}

lib/uvccamera_widget.dart