Question

我试图将个人资料图片上传到Firebase存储，然后将其下载URL保存到数据库。上传效果完美，但下载网址遇到问题。我已经尝试了Stack Overflow上的几乎所有内容。我正在分享相关代码。

<div *ngFor="let queestion of questionsList; let i=index; ">
	<label>
			{{question.id}} 
		<input type="radio"  [name]='i+1'>
			<span>Yes</span>
		<input type="radio"   [name]='i+1' >
			<span>No</span><br>
	</label>
</div>
<div style="text-align: center">
	<button type="button">All Yes</button>
	<button type="button">All No</button>	
	<button type="button">Submit</button>
	<button type="button">Clear</button>	
</div>

选择图像

private String user_Name, user_Email, user_Password, user_Age, user_Phone, imageUri;
Uri imagePath;

上传数据

userProfilePic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("image/*");                                                              //Specify the type of intent
                intent.setAction(Intent.ACTION_GET_CONTENT);                                            //What action needs to be performed.
                startActivityForResult(Intent.createChooser(intent, "Select Image"), 
            }
        });

 @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {           //Here we get the result from startActivityForResult().
        if(requestCode == PICK_IMAGE && resultCode == RESULT_OK && data.getData() != null){
            imagePath = data.getData();                                                                 //data.getData() holds the path of the file.
            try {
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), imagePath);     //this converts the Uri to an image.
                userProfilePic.setImageBitmap(bitmap);
                imageTrue = 1;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

Answer 1

您的代码正确。您只需要在 sendUserData（）函数中的代码内部进行一些更正。您将在 UploadTask

的onSuccess中获得imageUrl

  DatabaseReference myRef;

     private void sendUserData (){
            FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
            myRef = firebaseDatabase.getReference("Users").child(firebaseAuth.getUid());
            final StorageReference imageReference = storageReference.child(firebaseAuth.getUid()).child("Images").child("Profile Pic");
                                                        //Here the root storage reference of our app storage is is "storageReference".
                                                        //.child(firebaseAuth.getUid()) creates a folder for every user. .child("images")
                                                        //creates another subfolder Images and the last child() function
                                                        //.child("Profile Pic") always gives the name of the file.
                                                        //User id/Images/profile_pic.png
                                                        //We can follow the same process for all other file types.

            if(imageTrue==1){
                UploadTask uploadTask = imageReference.putFile(imagePath);     //Now we need to upload the file.
                uploadTask.addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(getApplicationContext(), "File Upload Failed", Toast.LENGTH_SHORT).show();

                    }
                }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        imageReference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                            @Override
                            public void onSuccess(Uri uri) {
                                Uri downloadUri = uri;
                                imageUri = downloadUri.toString();
                                saveUserDetails(imageUri); // Image uploaded
                            }
                        });
                        Toast.makeText(getApplicationContext(), "File Uploaded Successfully", Toast.LENGTH_SHORT).show();

                    }
                });
            }else{
                saveUserDetails(""); // Image not uploaded
            }
    }

saveUserDetails的常用功能：

   public void saveUserDetails(String imageUri){

           UserProfile userProfile = new UserProfile(user_Name, user_Age, user_Email, user_Phone, imageUri);
                myRef.setValue(userProfile);
                Toast.makeText(getApplicationContext(), "User Data Sent.", Toast.LENGTH_SHORT).show();
     }

Answer 2

根据Firebase official Documentation，您可以使用UploadTask方法上的addOnCompleteListener下载URl。

UploadTask uploadTask =null;
final StorageReference ref = storageReference.child(firebaseAuth.getUid()).child("Images").child("Profile Pic").child(imagePath);
uploadTask = ref.putFile(file);

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 ref.getDownloadUrl();
    }
}).addOnCompleteListener(new OnCompleteListener<Uri>() {
    @Override
    public void onComplete(@NonNull Task<Uri> task) {
        if (task.isSuccessful()) {
            Uri downloadUri = task.getResult();
          saveUserDetails(uri);
        } else {
            // Handle failures
            // ...
        }
    }
});

另一种替代方法，在成功上传图片后，使用get downloadUrl.hope查询并获取图片网址，这可能会对您有所帮助！

private void getImageUrl(){
     storageReference.child(firebaseAuth.getUid()).child("Images").child("Profile Pic").child(imagePath).getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
            @Override
            public void onSuccess(Uri uri) {
                saveUserDetails(uri);
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception exception) {
                // Handle any errors
            }
        });

}

无法在Android Firebase中获取上载文件的下载网址

2 个答案: