Flutter AWS Kinesis Video API集成插件aws_kinesisvideo_api的使用

Flutter AWS Kinesis Video API集成插件aws_kinesisvideo_api的使用

1. 简介

aws_kinesisvideo_api 是一个由API规范生成的Dart库，用于与Amazon Kinesis Video Streams服务进行交互。该库允许开发者在Flutter应用程序中轻松地调用Kinesis Video Streams的API。

2. 安装

要使用 aws_kinesisvideo_api 插件，首先需要在 pubspec.yaml 文件中添加依赖项：

dependencies:
  aws_kinesisvideo_api: ^latest_version

然后运行 flutter pub get 来安装依赖。

3. 初始化Kinesis Video客户端

下面是一个简单的示例，展示了如何初始化Kinesis Video客户端并设置区域（Region）：

import 'package:aws_kinesisvideo_api/kinesisvideo-2017-09-30.dart';

void main() {
  // 初始化Kinesis Video客户端，指定区域为'eu-west-1'
  final service = KinesisVideo(region: 'eu-west-1');
  
  // 打印客户端信息（可选）
  print('Kinesis Video client initialized for region: ${service.config.region}');
}

4. 使用Kinesis Video API

aws_kinesisvideo_api 提供了多种API方法，可以用于创建、管理、删除Kinesis Video流，以及上传和下载视频数据。以下是一些常见的API调用示例：

4.1 创建Kinesis Video流

要创建一个新的Kinesis Video流，可以使用 createStream 方法。以下是一个完整的示例：

import 'package:aws_kinesisvideo_api/kinesisvideo-2017-09-30.dart';

void createKinesisVideoStream() async {
  final service = KinesisVideo(region: 'eu-west-1');

  try {
    // 创建Kinesis Video流
    final response = await service.createStream(
      streamName: 'MyKinesisVideoStream', // 流名称
      dataRetentionInHours: 24,           // 数据保留时间（小时）
      deviceName: 'MyDevice',             // 设备名称（可选）
      mediaType: 'video/h264',            // 媒体类型（可选）
    );

    // 打印创建成功的流ID
    print('Stream created with ID: ${response.streamARN}');
  } catch (e) {
    // 捕获并打印任何错误
    print('Failed to create stream: $e');
  }
}

4.2 获取Kinesis Video流列表

要获取当前账户中的所有Kinesis Video流，可以使用 listStreams 方法。以下是一个示例：

import 'package:aws_kinesisvideo_api/kinesisvideo-2017-09-30.dart';

void listKinesisVideoStreams() async {
  final service = KinesisVideo(region: 'eu-west-1');

  try {
    // 获取Kinesis Video流列表
    final response = await service.listStreams();

    // 打印每个流的名称和ARN
    for (var stream in response.streamInfoList ?? []) {
      print('Stream Name: ${stream.streamName}, ARN: ${stream.streamARN}');
    }
  } catch (e) {
    // 捕获并打印任何错误
    print('Failed to list streams: $e');
  }
}

4.3 删除Kinesis Video流

要删除一个现有的Kinesis Video流，可以使用 deleteStream 方法。以下是一个示例：

import 'package:aws_kinesisvideo_api/kinesisvideo-2017-09-30.dart';

void deleteKinesisVideoStream() async {
  final service = KinesisVideo(region: 'eu-west-1');

  try {
    // 删除指定的Kinesis Video流
    await service.deleteStream(
      streamARN: 'arn:aws:kinesisvideo:eu-west-1:123456789012:stream/MyKinesisVideoStream/1234567890123',
    );

    // 打印删除成功的消息
    print('Stream deleted successfully');
  } catch (e) {
    // 捕获并打印任何错误
    print('Failed to delete stream: $e');
  }
}

5. 完整示例Demo

以下是一个完整的Flutter应用示例，展示了如何集成 aws_kinesisvideo_api 插件，并提供了一个简单的UI来创建、列出和删除Kinesis Video流。

import 'package:flutter/material.dart';
import 'package:aws_kinesisvideo_api/kinesisvideo-2017-09-30.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Kinesis Video Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: KinesisVideoHomePage(),
    );
  }
}

class KinesisVideoHomePage extends StatefulWidget {
  [@override](/user/override)
  _KinesisVideoHomePageState createState() => _KinesisVideoHomePageState();
}

class _KinesisVideoHomePageState extends State<KinesisVideoHomePage> {
  final KinesisVideo _kinesisVideoService = KinesisVideo(region: 'eu-west-1');
  List<StreamInfo> _streams = [];

  Future<void> _createStream() async {
    try {
      final response = await _kinesisVideoService.createStream(
        streamName: 'MyKinesisVideoStream',
        dataRetentionInHours: 24,
      );
      setState(() {
        _streams.add(StreamInfo(streamARN: response.streamARN, streamName: 'MyKinesisVideoStream'));
      });
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Stream created')));
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Failed to create stream: $e')));
    }
  }

  Future<void> _listStreams() async {
    try {
      final response = await _kinesisVideoService.listStreams();
      setState(() {
        _streams = response.streamInfoList ?? [];
      });
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Failed to list streams: $e')));
    }
  }

  Future<void> _deleteStream(String streamARN) async {
    try {
      await _kinesisVideoService.deleteStream(streamARN: streamARN);
      setState(() {
        _streams.removeWhere((stream) => stream.streamARN == streamARN);
      });
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Stream deleted')));
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Failed to delete stream: $e')));
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Kinesis Video Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            ElevatedButton(
              onPressed: _createStream,
              child: Text('Create Stream'),
            ),
            SizedBox(height: 16),
            ElevatedButton(
              onPressed: _listStreams,
              child: Text('List Streams'),
            ),
            SizedBox(height: 16),
            Expanded(
              child: ListView.builder(
                itemCount: _streams.length,
                itemBuilder: (context, index) {
                  final stream = _streams[index];
                  return ListTile(
                    title: Text('Stream Name: ${stream.streamName}'),
                    subtitle: Text('ARN: ${stream.streamARN}'),
                    trailing: IconButton(
                      icon: Icon(Icons.delete),
                      onPressed: () => _deleteStream(stream.streamARN),
                    ),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}