如何在Flutter中获取数据库中图像的下载URL [英] How do i get the image download URL in database in Flutter

问题描述

我想获取图像下载链接并将其存储在 Firestore 数据库中。 Bellow是用于将图像上传到Firebase存储的函数，如果该函数有误，您可以解释原因并为我编写一个函数吗？

I want to get the image download link and store it in Firestore database. Bellow is the function to upload the image to Firebase storage, if the function is wrong can you please explain why and write me a function?

File _image1;
Future uploadPic() async {
    StorageReference reference = storage.ref().child('image');
    StorageUploadTask uploadTask = reference.putFile(_image1);
    StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
    String url = await taskSnapshot.ref.getDownloadURL();
    imageUrl1 = url;
  }

推荐答案

add返回到函数检索输出（URL）

add return to the function to retrieve the output(url)

File _image1;
Future uploadPic() async {
    StorageReference reference = storage.ref().child('image');
    StorageUploadTask uploadTask = reference.putFile(_image1);
    StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
    String url = await taskSnapshot.ref.getDownloadURL();
    imageUrl1 = url;
    return url;
  }

由此您可以调用then函数，

From this you can call the then function,

uploadPic().then((value)
            {
        DocumentReference docRef = 
        Firestore.instance.collection('collectionname').document(documentid);
             docRef.setData({'pic' : value},merge:true)
             });

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