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Firebase在Android中,存储正常,但数据库不正常

firebase android

Eoghan Casey · 技术社区 · 7 年前

我正在尝试在Firebase中存储一个包含有关该图像的一些相关数据的图像。当我按下保存按钮时,图像会保存到我的存储文件夹中没有问题,但数据库属性没有被保存,我不知道为什么。这是我的代码:

String Storage_Path = "All_Book_Images";

String Database_Path = "All_Books";

Uri FilePathUri;

StorageReference storageReference;
DatabaseReference databaseReference;

int Image_Request_Code = 71;

ProgressDialog progressDialog;

Button imageButton, saveButton;
EditText title, author, price, category, additionalInfo;

ImageView SelectImage;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bookupload);

    SelectImage = (ImageView) findViewById(R.id.book_image);

    title = (EditText) findViewById(R.id.title_text);
    author = (EditText) findViewById(R.id.author_text);
    price = (EditText) findViewById(R.id.price_text);
    category = (EditText) findViewById(R.id.category_text);
    additionalInfo = (EditText) findViewById(R.id.info_text);

    storageReference = FirebaseStorage.getInstance().getReference();
    databaseReference = FirebaseDatabase.getInstance().getReference(Database_Path);
}

public void imageButton(View view){
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent,"Select Image"),0);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == 0 && resultCode == RESULT_OK){
        FilePathUri = data.getData();

        try{
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), FilePathUri);
            SelectImage.setImageBitmap(bitmap);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public String getActualImage(Uri uri){
    ContentResolver contentResolver = getContentResolver();
    MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
    return  mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(uri));
}

public void uploadData(View view){

    if(FilePathUri != null){


        final ProgressDialog progressDialog = new ProgressDialog(this);
        progressDialog.setTitle("Uploading");
        progressDialog.show();

        StorageReference reference = storageReference.child(Storage_Path + System.currentTimeMillis() + "." + getActualImage(FilePathUri));


        reference.putFile(FilePathUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {



                String Title = title.getText().toString();
                String Author = author.getText().toString();
                String Price = price.getText().toString();
                String Category = category.getText().toString();
                String AdditionalInfo = additionalInfo.getText().toString();

                Book book = new Book(taskSnapshot.getDownloadUrl().toString(), Title, Author, Price, Category, AdditionalInfo);

                String id = databaseReference.push().getKey();

                databaseReference.child(id).setValue(book);

                progressDialog.dismiss();
                Toast.makeText(getApplicationContext(),"Data uploaded",Toast.LENGTH_LONG).show();
            }
        })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        progressDialog.dismiss();
                        Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_LONG).show();

                    }
                })
                .addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
                    @SuppressWarnings("VisibleForTests")
                    @Override
                    public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                        double totalProgress = (100*taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
                        progressDialog.setMessage("Uploaded % " + (int)totalProgress);
                    }
                });


    } else {
        // show message
        Toast.makeText(getApplicationContext(),"Please select data first",Toast.LENGTH_LONG).show();
    }

}

是什么导致它与Firebase fine的存储方面交互,而不是与数据库交互?

2 回复 | 直到 7 年前

Gastón Saillén Michael Lehenbauer 7 年前

查看Firebase官方文件中的这段代码,我已经在里面写下了你的一些要求,但你明白了

private void writeNewPost(String Title, String Price, String Author) {

    String key = databaseReference.push().getKey();
    Post post = new Post(Title, Price, Author);
    Map<String, Object> postValues = post.toMap();

    Map<String, Object> books = new HashMap<>();
    books.put(Title, postValues);
    books.put(Price, postValues);
    books.put(Author, postValues);

    mDatabase.child(key).updateChildren(books);
}

有关详细信息: https://firebase.google.com/docs/database/android/read-and-write

PS:您可以使用 updateChildren() 或 setValue() ,这取决于你需要哪一个。

如果您使用 setValue() 这样,在指定的位置(包括辅助节点)覆盖数据。

只需调用一个 updateChildren() 。

Eoghan Casey 7 年前

事实证明,我的代码实际上运行正常,只是Firebase数据库的规则设置不正确。我在问题中发布的代码应该适用于任何试图实现此功能的人。