firebase-realtime-database

问题 I need to create and use a database entry with all details (uid, name etc) for each user that logs in to the application I am having trouble storing user data in order to use and retrieve user profile info using Firebase in Android. I found this documentation on the old version of Firebase but this does not seem to work any longer. Does anyone know how to reproduce the above code so it works with the new version of Firebase? Many thanks in advance. Edit - code below: final Firebase ref = new

问题 I tried to get the data from Firebase and store it into an array. However, when I try to get the data from the array, it became undefined. Can anyone tell me why would it happened? var events = []; var databaseRef = database.ref("events").orderByChild("date"); databaseRef.on('child_added', function(snapshot) { var event = snapshot.val(); events.push({ title: event.title, content: event.content }); }); console.log(events); console.log(events[0]); console.log(events.pop()); In #1, all the data

问题 I have a list view to retrieve the data from firebase realtime database. But the problem is I want to show the last added data on the top of the listview...Its a notice board type project so, I want to show the latest notice on the to of the listview...could't find some good solutions on the web.... here are the codes of "mainactivity.java".... package com.example.wrappo; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity;

问题 I get duplicate data (old and updated data) in my UITableView whenever I update my data from firebase. I am actually trying to create a realtime database for my UITableView . var foodlist = [FoodModel]() @objc func load_data() { Database.database().reference().child("Food").observe(.value) { (snapshot: DataSnapshot) in if let dict = snapshot.value as ? [String: AnyObject] { for child in dict.values { if let FoodimageText = child["image"] as ? String, let FoodnameText = child["name"] as ?

问题 I get duplicate data (old and updated data) in my UITableView whenever I update my data from firebase. I am actually trying to create a realtime database for my UITableView . var foodlist = [FoodModel]() @objc func load_data() { Database.database().reference().child("Food").observe(.value) { (snapshot: DataSnapshot) in if let dict = snapshot.value as ? [String: AnyObject] { for child in dict.values { if let FoodimageText = child["image"] as ? String, let FoodnameText = child["name"] as ?

问题 I am creating an Ionic 2 app with firebase and I need a way to listen to database changes (specifically on child_added) when the app is closed (I.e. in foreground,background and killed) Basically, I want to use WebRTC to make calls within the app like whatsapp and I am following this post - https://websitebeaver.com/insanely-simple-webrtc-video-chat-using-firebase-with-codepen-demo However, the only thing that puzzles me is how it will work when the app is closed. Can anyone please help me

问题 I am creating an Ionic 2 app with firebase and I need a way to listen to database changes (specifically on child_added) when the app is closed (I.e. in foreground,background and killed) Basically, I want to use WebRTC to make calls within the app like whatsapp and I am following this post - https://websitebeaver.com/insanely-simple-webrtc-video-chat-using-firebase-with-codepen-demo However, the only thing that puzzles me is how it will work when the app is closed. Can anyone please help me

问题 i wanted to get the data from two tables in firebase db the 1st table was from here i want to get the next data from table based on the hospital_fk this is the result it got on my json and here is my script for getting the data.. router.get('', function(req, res){ var booths = database.ref('booths'); var hospital = database.ref('hospitals'); booths.once('value', function (snapshot) { var dataSet = []; snapshot.forEach(function (childSnapshot) { var childKey = childSnapshot.key; var fk =

问题 firebaser here When I recently tweeted about the new increment() operator in the Firebase Realtime Database, a team mate asked how fast increment() is. I've been wondering the same: how fast can you increment a value with increment(1) ? And how does that compare to using a transaction to increment a value? 回答1: TL;DR I tested these cases: Increment a value with a transaction call: ref.transaction(function(value) { return (value || 0) + 1; }); Increment a value with the new increment operator:

问题 I am fetching some records from firebase database in a RecyclerView. I am already fetching the data on the basis of a specific key-value. Now I want the data to be sorted for a date key whose format is MM-dd-yyyy. How can I sort it? My code to fetch it: FirebaseRecyclerAdapter<Eventsdata,Eventshistory.Game> adapter=new FirebaseRecyclerAdapter<Eventsdata,Eventshistory.Game>(Eventsdata.class ,R.layout.eventshistoryrow ,Eventshistory.Game.class ,reference.child("Events").orderByChild("uid")