Flutter，dart:io -将Uint8List (从websocket)转换为我可以绘制的jpeg文件

import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Convert Uint8List to JPEG'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Convert'),
            onPressed: () {
              convertUint8ListToJPEG();
            },
          ),
        ),
      ),
    );
  }

  void convertUint8ListToJPEG() async {
    // 从websocket接收到的Uint8List数据
    Uint8List data = Uint8List(100); // 假设这里是实际的数据

    // 获取应用程序的文档目录
    Directory appDocDir = await getApplicationDocumentsDirectory();
    String appDocPath = appDocDir.path;

    // 创建一个临时文件
    File tempFile = File('$appDocPath/temp.jpg');

    // 将Uint8List数据写入临时文件
    await tempFile.writeAsBytes(data);

    // 加载临时文件为可绘制的JPEG图像
    ByteData imageData = await rootBundle.load(tempFile.path);
    Uint8List imageBytes = imageData.buffer.asUint8List();
    ImageProvider imageProvider = MemoryImage(imageBytes);

    // 在UI中显示JPEG图像
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('Converted Image'),
          content: Image(image: imageProvider),
          actions: [
            FlatButton(
              child: Text('OK'),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
          ],
        );
      },
    );
  }
}