Question

我正尝试从Firebase数据库中检索所有用户帖子，并希望借助Recycler View和Firebase Recycler Adapter在Main Activity上显示它。但是在成功将图像上传到Firebase数据库之后，我可以在firebase控制台的存储部分看到上传的图像，但是在数据库部分显示的是-

com.google.android.gms.tasks.zzu@3c50f45

所以我认为问题出在这行代码：

downloadUrl = task.getResult().getStorage().getDownloadUrl().toString();

代码：

private Uri ImageUri;
    private StorageReference PostsImagesRefrence;
    private DatabaseReference UsersRef, PostsRef;
    PostsImagesRefrence = FirebaseStorage.getInstance().getReference();
    PostsRef = FirebaseDatabase.getInstance().getReference().child("Posts");

    StorageReference filePath = PostsImagesRefrence.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg");

            filePath.putFile(ImageUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>()
            {
                @Override
                public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task)
                {
                    if(task.isSuccessful())
                    {
                        downloadUrl = task.getResult().getStorage().getDownloadUrl().toString();
                        Toast.makeText(PostActivity.this, "image uploaded successfully to Storage...", Toast.LENGTH_SHORT).show();
                        SavingPostInformationToDatabase();
                    }
                    else
                    {
                        String message = task.getException().getMessage();
                        Toast.makeText(PostActivity.this, "Error occured: " + message, Toast.LENGTH_SHORT).show();

                    }

                }
            });

设计视图和实际输出图像：

Design View

View After Running

请尝试为我提供正确的代码，作为我的新手并且不了解Android Studio并希望完成此College Project，请为我提供帮助。

Answer 1

尝试更改

String userFullName = dataSnapshot.child("fullname").getValue().toString();
String userProfileImage = dataSnapshot.child("profileimage").getValue().toString();

收件人

String userFullName = dataSnapshot.child("fullname").getValue(String.class);
String userProfileImage = dataSnapshot.child("profileimage").getValue(String.class);

编辑：尝试

dateRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
    @Override
    public void onSuccess(Uri downloadUrl) 
    {                
       downloadUrlString = downloadUrl.toString();
    } 
});

Answer 2

解决了这个问题，我正在使用旧的方法将图像存储到Firebase数据库中。

已进行以下更改以解决此问题：

final StorageReference filePath = PostsImagesRefrence.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg");

            final UploadTask uploadTask =filePath.putFile(ImageUri);

            uploadTask.addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e)
                {
                    String message =e.toString();
                    Toast.makeText(PostActivity.this, "Error occured: " + message, Toast.LENGTH_SHORT).show();
                }
            }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>()
            {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot)
            {
                Toast.makeText(PostActivity.this, "Image uploaded successfully to Storage...", Toast.LENGTH_SHORT).show();

                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();
                        }
                        downloadUrl= filePath.getDownloadUrl().toString();
                        return filePath.getDownloadUrl();
                    }
                }).addOnCompleteListener(new OnCompleteListener<Uri>()
                {
                    @Override
                    public void onComplete(@NonNull Task<Uri> task)
                    {
                        if (task.isSuccessful())
                        {
                            downloadUrl = task.getResult().toString();
                            Toast.makeText(PostActivity.this, "Stored Image Successfully to Database", Toast.LENGTH_SHORT).show();
                            SavingPostInformationToDatabase();
                        }

                    }
                });

            }

发布的图像未出现在Firebase回收器视图中

2 个答案: