【Flutter】支持多平台 多端保存图片到本地相册 (兼容 Web端 移动端 android 保存到本地)

免责声明: 我只测试了Web端 和 Android端 可行哈

import 'dart:io';
import 'package:flutter/services.dart';
import 'package:http/http.dart' as http;
import 'package:universal_html/html.dart' as html;
import 'package:oktoast/oktoast.dart';
import 'package:image_gallery_saver/image_gallery_saver.dart';
import 'package:permission_handler/permission_handler.dart';//申请存 本地存储 和 相册 权限
Future<bool> getPhotoPermission() async {if (Platform.isIOS) {var storageStatus = await Permission.storage.status;var photosStatus = await Permission.photos.status;if (storageStatus.isDenied || photosStatus.isDenied) {Map<Permission, PermissionStatus> statuses = await [Permission.storage,Permission.photos,].request();}return storageStatus.isGranted && photosStatus.isGranted;} else {var storageStatus = await Permission.storage.status;var photosStatus = await Permission.photos.status;if (storageStatus.isDenied || photosStatus.isDenied) {Map<Permission, PermissionStatus> statuses = await [Permission.storage,Permission.photos,].request();}return storageStatus.isGranted && photosStatus.isGranted;}
}// 根据网络路径保存图片到相册
Future<void> saveImage(String imageUrl) async {final response = await http.get(Uri.parse(imageUrl));final bytes = response.bodyBytes;if (kIsWeb) {final imageData = Uint8List.fromList(bytes);final blob = html.Blob([imageData], 'image/jpeg');final url = html.Url.createObjectUrlFromBlob(blob);final anchor = html.AnchorElement(href: url);String timestamp = DateTime.now().millisecondsSinceEpoch.toString();anchor.download = 'image_$timestamp.jpg';anchor.click();html.Url.revokeObjectUrl(url);} else {if (Platform.isAndroid || Platform.isIOS) {bool permission = await getPhotoPermission();if (permission) {if (Platform.isIOS) {// 自动以时间戳命名final result = await ImageGallerySaver.saveImage(bytes);if (result != null) {showToast("保存成功");} else {print('error');}} else {//安卓// 自动以时间戳命名final result = await ImageGallerySaver.saveImage(bytes);if (result != null) {showToast("保存成功");} else {print('error');}}} else {//重新请求--第一次请求权限时，保存方法不会走，需要重新调一次saveImage(imageUrl);}} else {throw PlatformException(code: 'PLATFORM_NOT_SUPPORTED',message: 'Saving images is not supported on this platform.',);}}
}