flutter_downloader提示 FlutterDownloader.initialize() must be called first

如果使用flutter_downloader的时候提示FlutterDownloader.initialize() must be called first 具体错误如下：

[ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: 'package:flutter_downloader/src/downloader.dart': Failed assertion: line 

73 pos 12: '_initialized': FlutterDownloader.initialize() must be called first

解决方法请参考： https://github.com/fluttercommunity/flutter_downloader/issues/354

在flutter_downloader最新版本1.5.2中我们还需要在main.dart中初始化FlutterDownloader，详情见main.dart

import 'package:flutter_downloader/flutter_downloader.dart';
const debug = true;  //表示是否在控制台显示调试信息
void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await FlutterDownloader.initialize(debug: debug);

  runApp(new MyApp());
}