import 'dart:collection'; import 'package:dio/dio.dart'; import 'package:flutter/material.dart'; import 'package:fluttertoast/fluttertoast.dart'; import 'package:image_gallery_saver/image_gallery_saver.dart'; import 'package:path_provider/path_provider.dart'; import 'package:permission_handler/permission_handler.dart'; class Download { static HashMap hashMap = HashMap(); Future fileToGallery( String url, { String postfix, Function(int, int) progress, }) async { // 检查是否已有读写内存的权限 bool status = await Permission.storage.isGranted; //判断如果还没拥有读写权限就申请获取权限 if (status || await Permission.storage.request().isGranted) { if (hashMap.containsKey(url)) { return "正在下载"; } else { hashMap[url] = false; } try { var strs = url.split('.'); if (strs.length < 0) { return "文件链接错误"; } var appDocDir = await getTemporaryDirectory(); String savePath = appDocDir.path + "/" + DateTime.now().toIso8601String().toString() + (strs[strs.length - 1].length > 4 ? (postfix ?? "") : strs[strs.length - 1]); await Dio().download(url, savePath, onReceiveProgress: (count, toal) { if(progress!=null){ progress(count, toal); } }); print(savePath); final result = await ImageGallerySaver.saveFile(savePath); print(result); return "保存成功"; } catch (e) { return "下载失败,原因:" + e.toString(); } finally { hashMap.remove(url); } } else { return "请前往系统设置开启应用的内存读取权限再尝试"; } } }