相关疑难解决方法(0)

我想将用户在我的应用中选择的照片发送到Firebase存储.我有一个简单的类属性_imageFile,其设置如下:

File _imageFile;

_getImage() async {
    var fileName = await ImagePicker.pickImage();
    setState(() {
        _imageFile = fileName;
    });
}

之后,我发送照片与此代码:

final String rand1 = "${new Random().nextInt(10000)}";
final String rand2 = "${new Random().nextInt(10000)}";
final String rand3 = "${new Random().nextInt(10000)}";
final StorageReference ref = FirebaseStorage.instance.ref().child('${rand1}_${rand2}_${rand3}.jpg');
final StorageUploadTask uploadTask = ref.put(_imageFile);
final Uri downloadUrl = (await uploadTask.future).downloadUrl;
print(downloadUrl);

问题是照片通常非常大.在上传之前,Flutter/Dart中是否有任何压缩和调整照片大小的方法？我很好,质量下降.