从网址下载文件，保存到手机存储

使用https://pub.dartlang.org/packages/flutter_downloader。不要忘记进行平台配置。

基本上，这就是您应该使用软件包的方式。链接中有一个详细的详细示例。

final taskId = await FlutterDownloader.enqueue(  url: 'your download link',  savedDir: 'the path of directory where you want to save downloaded files',  showNotification: true, // show download progress in status bar (for Android)  openFileFromNotification: true, // click on notification to open downloaded file (for Android));