将文件URL上传到Firebase之后，如何获取文件URL

Question

一旦将文件上传到firebase，如何获取它的URL，以便可以存储以供以后使用？我想将URL写入Firebase数据库，以便其他用户可以访问图像。

我像这样上传文件：

public void uploadFile()
{
    StorageReference filepath = mstorageRef.child("folder").child(filename);
    Uri File= Uri.fromFile(new File(mFileName));
    filepath.putFile(File).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot)
        {
            Toast.makeText(MtActivity.this, "Upload Done", Toast.LENGTH_LONG).show();
        }
    });
}

我已经确认文件实际上正在上传，所以现在我只需要将其写入数据库的URL即可。但是，当我尝试这样做时：

Uri downloadUrl = taskSnapshot.getMetadata().getDownloadUrl();

它给了我一个错误，并说This method should only be accessed from tests or within private scope

我不确定这是什么意思

有一种新的方法来获取URL吗？

另外，特别是该项目独有的URL？这意味着如果我将其存储到数据库中并尝试以后访问它，我可以这样做吗？

Answer 1

您正在使用不弃用的 UploadTask.getDownloadUrl()。您可以使用storagereference.getDownloadurl((。

在您的情况下，您可以尝试 -

 filepath.putFile(File).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
    @Override
    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot)
    {
         filepath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                    @Override
                    public void onSuccess(Uri uri) {
                        Uri downloadUrl = uri;
                       //Do what you want with the url
                    }
        Toast.makeText(MtActivity.this, "Upload Done", Toast.LENGTH_LONG).show();
    }
});

注意StorageReference.getDownloadUrl()返回任务，必须异步处理，您不能执行Uri downloadUrl = photoRef.getDownloadUrl().getResult();否则您将获得java.lang.IllegalStateException: Task is not yet complete

Answer 2

如上所述，StorageReference.getDownloadUrl()返回任务。

这是我的代码：

        filepath.putFile(imageUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
                if(task.isSuccessful()){
                    filepath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                        @Override
                        public void onSuccess(Uri uri) {
                            Uri downloadUri = uri;
                            String download_url = uri.toString();
                            mUserDatabase.child("image").setValue(download_url).addOnCompleteListener(new OnCompleteListener<Void>() {
                              @Override
                                public void onComplete(@NonNull Task<Void> task) {
                                   if(task.isSuccessful()) {
                                          mProgressDialog.dismiss();
                                          Toast.makeText(SettingActivity.this, "Successfully uploaded", Toast.LENGTH_LONG).show();
                                   }else {
                                       Toast.makeText(SettingActivity.this, "Error happened during the upload process", Toast.LENGTH_LONG).show();
                                   }
                                }
                            });
                        }
                    });

                }else{
                    Toast.makeText(SettingActivity.this, "Error happened during the upload process", Toast.LENGTH_LONG ).show();
                }
            }
        });

Answer 3

此方法也可以工作，并且更简单。

这不是"令人难以置信的"，但它将您的代码减少到几行。希望这是一个有用的答案。

StorageReference filepath = mstorageRef.child("folder").child(filename);
filepath.putFile(File).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot){
            Uri downloadUrl = filepath.getDownloadUrl();  // here is Url for photo  
            Toast.makeText(MtActivity.this, "Upload Done", Toast.LENGTH_LONG).show();
        }
});

Answer 4

这很热，我做了

1(这是我的上传并获取HTTP URL代码：

UploadTask uploadTask = FirebaseStorage.getInstance().getReference().child("id").child("filename")
                                .putFile(uri);
                        Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
                            @Override
                            public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
                                if (!task.isSuccessful()) {
                                    throw task.getException();
                                }
                                // Continue with the task to get the download URL
                                return FirebaseStorage.getInstance().getReference().child(user.getUid()).child(avatarName).getDownloadUrl();
                            }
                        }).addOnCompleteListener(new OnCompleteListener<Uri>() {
                            @Override
                            public void onComplete(@NonNull Task<Uri> task) {
                                if (task.isSuccessful()) {
                                    Uri downloadUri = task.getResult();
                                    FirebaseDatabase.getInstance().getReference().child(user.getUid())
                                            .child(avatarName)
                                            .child("avatar_image")
                                            .setValue(downloadUri.toString());
                                    Toast.makeText(getContext(), "Success", Toast.LENGTH_SHORT).show();
                                } else {
                                    // Handle failures
                                    // ...
                                    Toast.makeText(getContext(), "Failed", Toast.LENGTH_SHORT).show();
                                }
                            }
                        });

2(这是我的OnActivityResult代码从画廊的拾取图像

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
        uri = data.getData();
        try {
            bitmap = MediaStore.Images.Media.getBitmap(getContext().getContentResolver(), uri);
            // Log.d(TAG, String.valueOf(bitmap));
            ivAvatarPic.setImageBitmap(bitmap);
            //ImageView imageView = (ImageView) findViewById(R.id.imageView);
            //imageView.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Answer 5

使用以下代码

val imageGalleryRef = storageReference?.child(name + "_gallery")
            val uploadTask = imageGalleryRef.putFile(file)
            uploadTask.addOnFailureListener({ e ->
                Log.e(TAG, "onFailure sendFileFirebase " + e.message)
            }).addOnCompleteListener(
                    object : OnCompleteListener<UploadTask.TaskSnapshot> {
                        override fun onComplete(p0: Task<UploadTask.TaskSnapshot>) {
                            imageGalleryRef.downloadUrl.addOnSuccessListener { e ->
                                run {
                                     downloadUrl = e.toString() // e is image download Uri
                                }
                            }
                        }
                    }
            )

Answer 6

尝试这个：

 filepath.putFile(File).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
         @Override
         public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
            if(task.isSuccessful()){
                 String fileUri = task.getResult().getUploadSessionUri().toString();
                         // Do whatever you want with fileUri 
                        }
                   }
            }) ;

Answer 7

 filePath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                            @Override
                            public void onSuccess(Uri uri) {
                                String category = spinner.getSelectedItem().toString();
                                String title = ((EditText) findViewById(R.id.post_title)).getText().toString();
                                String description = ((EditText) findViewById(R.id.post_description)).getText().toString();
                                final Post post = new Post(userId, category, title, description, latitude, longitude, true);
                                post.setAddressList(addressLine);
                                post.setContact(contact);
                                if (addressLine != null) {
                                    post.setPlace(addressLine.split(",")[2]);
                                }
                                post.setId(key);
                                post.setImage(uri.toString());
                                databaseReference.setValue(post).addOnCompleteListener(new OnCompleteListener<Void>() {
                                    @Override
                                    public void onComplete(@NonNull Task<Void> task) {
                                        if (task.isSuccessful()) {
                                            ((EditText) findViewById(R.id.post_title)).setText("");
                                            ((EditText) findViewById(R.id.post_description)).setText("");
                                            postImageButton.setImageURI(null);
                                            progressBarDialog.dismiss();
                                            Toast.makeText(PostActivity.this, "Your request is sucessfully completed", Toast.LENGTH_SHORT).show();
                                        } else if (!task.isSuccessful()) {
                                            progressBarDialog.dismiss();
                                            Toast.makeText(PostActivity.this, "Your request is not completed", Toast.LENGTH_SHORT).show();
                                        }
                                    }
                                });
                            }
                        });
                    }

Answer 8

将 uri 更改为 url

val urlTask = uploadTask.continueWith { task ->
            if (!task.isSuccessful) {
                task.exception?.let {
                    throw it
                }
            }

            spcaeRef.downloadUrl
        }.addOnCompleteListener { task ->
            if (task.isSuccessful) {
                val downloadUri = task.result
                //URL
                val url = downloadUri!!.result
            } else {
                //handle failure here
            }
        }

Answer 9

在离子5 电容器中，这就是我最终能够监视上传并获取完成的文件名。

该代码是从Google自己的文档 一些Google搜索(https://ionicthemes.com/tutorials/about/ionic-firebase-image-image-upload等(收集的。

它正在使用帆布(据我所知(从图像中生成base64字符串。这起作用了，Ionic的文件和base64没有。

在页面上，我有一个an＆lt; ion-progressbar>显示百分比(this.downloadprogress(，如果它是>0。我也有an＆lt; ion-img>带有src = this.imageurl显示图片上传时。

我无法在上述工作答案中获得任何技术，甚至不会编译。但是我不知道为什么还是知道为什么。

另一个警告是某些示例代码使用的函数((而不是箭头语法

encdoimageuri(imageuri，function(image64({

需要重写箭头语法以绑定/将"此"绑定到所谓的函数，如下所示：

encdoimageuri(imageuri，image64 => {

    uploadImage(imageURI) {
    console.log(`try upload ${imageURI}`)
      let storageRef = firebase.storage().ref();
      let imageRef = storageRef.child('image').child('imageName');
      this.encodeImageUri(imageURI, image64 => {
        // create upload task
        const uplTask = imageRef.putString(image64, 'data_url');
        uplTask.on('state_changed',
          snapshot => {
            var progress = (snapshot.bytesTransferred / snapshot.totalBytes);
            console.log('Upload is ' + progress * 100 + '% done'); // might display this somewhere
            this.downloadProgress = progress; // update progress bar
          },
          error => {
            console.log('upload error');
          },
          () => {
            uplTask.snapshot.ref.getDownloadURL()
              .then(downloadURL => {
                console.log('File available at', downloadURL);
                this.imageUrl = downloadURL;
                this.downloadProgress = -1; // negative values hide the progress bar
              });        
          }
        );
      });
  }
  encodeImageUri(imageUri, callback) {
    var c = document.createElement('canvas');
    var ctx = c.getContext("2d");
    var img = new Image();
    img.onload = function () {
      var aux:any = this;
      c.width = aux.width;
      c.height = aux.height;
      ctx.drawImage(img, 0, 0);
      var dataURL = c.toDataURL("image/jpeg");
      callback(dataURL);
    };
    img.src = imageUri;
  };

当然这有点无聊

不确定当我使用kotlin时，这是否是您想要的。这是我当前项目中对我有用的。我希望这将来会帮助别人。

首先，我是从相机或画廊获取图像。我正在使用当前的时间戳使文件名独特。

fun uploadFileFromMemory() {
        showLoading()
        val currentTimestamp = System.currentTimeMillis()
        val storage = Firebase.storage("Your storage url")
        // Create a storage reference from our app
        val storageRef = storage.reference
        // Create a reference to "mountains.jpg"
        val mountainsRef = storageRef.child("images/picture$currentTimestamp.jpg")
        // Get the data from an adminImageView as bytes
        adminImageView.isDrawingCacheEnabled = true
        adminImageView.buildDrawingCache()
        val bitmap = (adminImageView.drawable as BitmapDrawable).bitmap
        val baos = ByteArrayOutputStream()
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos)
        val data = baos.toByteArray()
        var uploadTask = mountainsRef.putBytes(data)
        val urlTask = uploadTask.continueWithTask { task ->
            if (!task.isSuccessful) {
                task.exception?.let {
                    throw it
                }
            }
            mountainsRef.downloadUrl
        }.addOnCompleteListener { task ->
            if (task.isSuccessful) {
                val downloadUri = task.result
                updateServicePicture(downloadUri.toString())
            } else {
                hideLoading()
                showToast("Something went wrong")
            }
        }

之后，我将获得新更新文件的URL，以使用此功能在Firestore数据库中更新图片URL属性。

fun updateServicePicture(url: String) {
        val db = FirebaseFirestore.getInstance()
        val id = arguments?.getString("id")
        if (id !== null) {
            val ref = db.collection("services").document(id)
// Set the "isCapital" field of the city 'DC'
            ref
                .update("picture", url)
                .addOnSuccessListener { Log.d(TAG, "DocumentSnapshot successfully updated!")
                    hideLoading()
                    showToast("Picture has been successfully updated")
                }
                .addOnFailureListener { e -> Log.w(TAG, "Error updating document", e)
                    hideLoading()
                    showToast("Something went wrong")
                }
        }
    }

hideloading((，showloading((和showtoast((是我的进度栏和吐司的功能。我希望这对某人有帮助。通过文档和一些测试，我最终使它起作用。愉快的编码大家。

  Future<List<String>> uploadImages(List<String> filepaths) async {
    List<String> uploadUrls = [];
    await Future.wait(filepaths.map((String filepath) async {
      FirebaseStorage storage = FirebaseStorage(storageBucket: 'gs://your-bucket-name.appspot.com');
      StorageUploadTask uploadTask = storage.ref().child("images/${basename(filepath)}").putFile(File(filepath));
      StorageTaskSnapshot storageTaskSnapshot;
      StorageTaskSnapshot snapshot = await uploadTask.onComplete;
      if (snapshot.error == null) {
        storageTaskSnapshot = snapshot;
        final String downloadUrl = await storageTaskSnapshot.ref.getDownloadURL();
        uploadUrls.add(downloadUrl);
        print('Upload success');
      } else {
        print('Error from image repo ${snapshot.error.toString()}');
        throw ('This file is not an image');
      }
    }), eagerError: true, cleanUp: (_) {
      print('eager cleaned up');
    });
    return uploadUrls;
  }
}

您是否尝试过taskSnapshot.getDownloadUrl()？如果也不起作用，您可以通过mstorageRef.child("folder").child(filename).toString()

获得成功的图像位置。

尝试以下：

final Uri uri = data.getData();
StorageReference filepath = mStorageRef.child("folder").child(filename);
filepath.putFile(uri).addOnSuccessListener(new 
OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
            Uri downloadUri = taskSnapshot.getDownloadUrl();
            //Getting url where image is stored
            //downloadUri will store image URI
        }
    });