Flutter：尝试通过 Firebase 压缩图像并将文件保存到云存储

Question

import 'package:flutter_image_compress/flutter_image_compress.dart';
import 'dart:io';

  Future<String> saveImageFileToFirestore({required String url}) async {
    final response = await http.get(Uri.parse(url));
    final bytes = response.bodyBytes;

    final directory = await getApplicationDocumentsDirectory();
    final file = File('${directory.path}/image.jpg');
    await file.writeAsBytes(bytes);

    File compressedFile = await compressAndGetFile(file, '${directory.path}/image2.jpg');

    String imageName = generateImageName();

    String downloadUrl = await storeFileImageToStorage('${Constants.images}/$imageName', compressedFile);
    return downloadUrl;
  }

  Future<String> storeFileImageToStorage(String ref, File file) async {
    UploadTask uploadTask = firebaseStorage.ref().child(ref).putFile(file);
    TaskSnapshot taskSnapshot = await uploadTask;
    String downloadUrl = await taskSnapshot.ref.getDownloadURL();
    return downloadUrl;
  }

  Future<File> compressAndGetFile(File file, String targetPath) async {
      var result = await FlutterImageCompress.compressAndGetFile(
      file.absolute.path, targetPath,
      quality: 88,
    );
        return result!;
  }

我正在尝试压缩下载的图像并将文件保存到 Firestore DB。当我运行代码时，它会抛出此错误消息。无法从“compressAndGetFile”方法返回“XFile”类型的值，因为它的返回类型为“Future”。它不会接受：

返回结果！;

如果有人可以提供帮助，我将不胜感激。我希望代码运行时不会出现错误。

Answer 1

FlutterImageCompress.compressAndGetFile

返回

Future<XFile?>

并且它所包装的函数返回

Future<File>

。尝试将其转换为 File 中的解决方案，如下所示：return File(result!.path);