firebase-realtime-database

问题 I was having some problem when trying to design for my firebase database structure. Basically, 1 account can have many receipts, 1 receipts can have many items. Here is the JSON: receipts { accountID1 : { receiptID1 : { date : "07/07/2017" store : { storeName : "store1" storeAddr : "addr1" } currency : { currencyName : "currency1" currentcySymbol : "$" } totalAmount : "50.00" items : { itemID1 : true, itemID2 : true, } } receiptID2 : { date : "08/07/2017" store : { storeName : "store1"

问题 FirebaseDatabase.getInstance().getReference("Block").addListenerForSingleValueEvent(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { for (DataSnapshot snap : dataSnapshot.getChildren()) { if(snap.getKey().equals(myUID)){ FirebaseDatabase.getInstance().getReference("Block").child(myUID).addListenerForSingleValueEvent(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { for (DataSnapshot snap : dataSnapshot

问题 I'm building an app using Firebase Realtime Database and I'm testing out the onFailure callback. I turn off my mobile data and run the code below. mDatabaseReference.updateChildren(childUpdates) .addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { Toast.makeText(TeamActivity.this, R.string.toast_message_error_add, Toast.LENGTH_LONG).show(); } }); The issue is that the toast message doesn't pop up, then when I turn back on the mobile data, all

问题 I knew my question is similar with the other questioners but it was not solved my problem because I am still curious about how to declare the item which is the children of parent node. This is my stucture data on my Firebase: I've tried to created the classes for my case: DolanIemClass.java private String name_tourism; private String location_tourism; private String info_tourism; private String telepon; private String url_photo; private String url_photo_collage; private double lat_location

问题 This question already has answers here : Firebase Auth: Get users by email or phone number (3 answers) Closed last year . DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference(); DatabaseReference usersRef = rootRef.child("Users"); ValueEventListener eventListener = new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { ListView listView = (ListView) rootView.findViewById(R.id.usersList); ArrayAdapter<String> adapter; adapter = new

问题 I am trying to display a users "post" in a table view on iOS. When a users writes a post and hits the post button in my app, the post is saved to my firebase real time data base but it is not displaying in the tableview on the viewcontroller on which the code is written in. I'm not sure if its my code or something to do with firebase not responding and showing the data. Here is my code: import Foundation import UIKit import Firebase class HomeViewController:UIViewController,

问题 In my app, I created login and signup page and saved the user name and email to my Firebase database. I also made bottom navigation with fragment. I want to take these values(name, mail) from Firebase and put it into TextView in profile fragment. When I tried this, my app crashed. How can I solve this problem? public class ProfileFragment extends Fragment { private FirebaseDatabase mFirebaseDatabase; private FirebaseAuth mAuth; private String userID; private TextView tName; private TextView

问题 I know this might be a common question but I am really stuck at this point. I am receiving data from 2 multiple locations and after I received from both I need to continue executing and than return that data to the calling method. I am aware of this thread: https://stackoverflow.com/a/33204705/1820644 but it doesn't fit here actually as I need to return the data to the calling method. For the method that blocks UI thread I can call it from AsyncTask , there is no problem. But how can I return

问题 I have a project in Firebase.This project has 2 apps: 1.Android 2.iOS I want to know which users are registered from android platform & likewise from iOS. Is there a way to know ? 回答1: May be there is no way to find android users and iOS users directly, you have to store a boolean value like for an example isAndroid in user table in Firebase Realtime Database while registration and after login fetch the value of isAndroid from user table and accordingly do the rest. 回答2: There is no built-in

问题 I am using react-redux-firebase. This is how my firebase data looks like once user submit the form: It pushes information to "contacts" and images to "uploadedFiles"(also used for file Storage path). I really want to have it as one item. Something like: contacts = { kydfsdcfasdfsadf :{ email: "user@gmail.com", firstName: Tom, lastName : "Smith", uploasedFiles:{ downloadURL:"dsfsdfsdsdvsdfgdsfgds", fullPath:"dfsdfsdf", mame:"q34deser4wefwsdf" } } } I feel like I should use Populate, but I can