flutter_downloader文件下载插件_flutter download

使用前需要初始化
await FlutterDownloader.initialize(debug: debug);

import 'dart:isolate';
import 'dart:ui';
import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:flutter_downloader/flutter_downloader.dart';
import 'package:permission_handler/permission_handler.dart';

const debug = true;

class FlutterDownloaderDemo extends StatefulWidget with WidgetsBindingObserver {
  @override
  _FlutterDownloaderDemoState createState() => new _FlutterDownloaderDemoState();
}

class _FlutterDownloaderDemoState extends State<FlutterDownloaderDemo> {
  final _documents = [
    {
      'name': 'Learning Android Studio',
      'link': 'http://barbra-coco.dyndns.org/student/learning_android_studio.pdf'
    },
    {
      'name': 'Android Programming Cookbook',
      'link': 'http://enos.itcollege.ee/~jpoial/allalaadimised/reading/Android-Programming-Cookbook.pdf'
    },
    {
      'name': 'iOS Programming Guide',
      'link': 'http://darwinlogic.com/uploads/education/iOS_Programming_Guide.pdf'
    },
    {
      'name': 'Objective-C Programming (Pre-Course Workbook',
      'link': 'https://www.bignerdranch.com/documents/objective-c-prereading-assignment.pdf'
    },
  ];

  final _images = [
    {
      'name': 'Arches National Park',
      'link': 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fb.zol-img.com.cn%2Fsjbizhi%2Fimages%2F5%2F320x510%2F137760363184.jpg&refer=http%3A%2F%2Fb.zol-img.com.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1624849370&t=fb018c3ff3c939cf5dd5fb52210bec7d'
    },
    {
      'name': 'Canyonlands National Park',
      'link': 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F01251f57c36e000000012e7e27412c.jpg&refer=http%3A%2F%2Fimg.zcool.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1624849370&t=609a5f51ecaa96b8e39b8747ea2fa2b2'
    },
    {
      'name': 'Death Valley National Park',
      'link': 'https://upload.wikimedia.org/wikipedia/commons/b/b2/Sand_Dunes_in_Death_Valley_National_Park.jpg'
    },
    {
      'name': 'Gates of the Arctic National Park and Preserve',
      'link': 'https://upload.wikimedia.org/wikipedia/commons/e/e4/GatesofArctic.jpg'
    }
  ];

  final _videos = [
    {
      'name': 'Big Buck Bunny',
      'link': 'http://commondatastorage.flutter-io.cn/gtv-videos-bucket/sample/BigBuckBunny.mp4'
    },
    {
      'name': 'Elephant Dream',
      'link': 'http://commondatastorage.flutter-io.cn/gtv-videos-bucket/sample/ElephantsDream.mp4'
    }
  ];

  //任务列表
  List<_TaskInfo> _tasks;
  //项目列表
  List<_ItemHolder> _items;
  //是否在加载
  bool _isLoading;
  //用户是否同意权限
  bool _permissionReady;
  //存储路径
  String _localPath;
  //接收端口
  ReceivePort _port = ReceivePort();

  @override
  void
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