firebase-realtime-database

问题 I have have uploaded pdf files and set it to the database Stored steps in Firebase Database and i have create a code to display in android and it works fine Displaying in listview i have create an intent to open in a new page and view the pdf in android public class ViewPdfFiles extends AppCompatActivity { private PDFView pdfView; private String url; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_view_pdf

问题 I am trying to get Root Node Names if specified myid value is present inside the node. For Example: Consider following structure -Likes -uid1 -postid1 -myid -othersid1 -othersid2 -postid2 -othersid1 -othersid2 -uid2 -postid3 -myid -othersid2 I want to get uid1 and postid1 rootnames if myid value is present inside the node. Similarly get uid2 and postid3 rootnames if myid present inside that node. I have written like this. public void checkNode() { DatabaseReference reference=FirebaseDatabase

问题 I am trying to get Root Node Names if specified myid value is present inside the node. For Example: Consider following structure -Likes -uid1 -postid1 -myid -othersid1 -othersid2 -postid2 -othersid1 -othersid2 -uid2 -postid3 -myid -othersid2 I want to get uid1 and postid1 rootnames if myid value is present inside the node. Similarly get uid2 and postid3 rootnames if myid present inside that node. I have written like this. public void checkNode() { DatabaseReference reference=FirebaseDatabase

问题 I need to read only one entity from Firebase Realtime Database and convert the result into a C# class matching the structure, but I haven't found a solution clear. Having this tree: { "characters" : { "c1" : { "Email" : "peter.pan@example.com", "LastName" : "Pan", "Name" : "Peter" }, "c2" : { "Email" : "harry.potter@example.com", "LastName" : "Potter", "Name" : "Harry" } } } And this C# class: public class Character { public string Email {get; set; } public string Name { get; set; } public

问题 Here I pasted you both codes for my fragment + the Posts.class does anyone know why this shows me an error ? I am new to this so I really cannot figure it out by myself some help would be great :) FirebaseRecyclerOptions<Posts> option = new FirebaseRecyclerOptions.Builder<Posts>() .setQuery(postsRef, Posts.class).build(); Fragment code package com.LiFit; import android.content.Intent; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view

问题 I am learning Flutter and I want to catch the exception that should be thrown ( as security rule is correctly rejecting it) at the Flutter Application/device. Below is the code try { FirebaseDatabase.instance.reference().once().then((DataSnapshot snapshot) { try { debugPrint(snapshot.toString()); } on DatabaseError catch (eIn1) { debugPrint(' onRoot ' + eIn1.toString()); } }); }on DatabaseError catch (eOut1) { debugPrint(' on1 ' + eOut1.toString()); } try { FirebaseDatabase.instance.reference

问题 I'm experiencing error when trying to access Database menu item within Firebase console . It's a new Database with literally couple records of data but screen keep spinning for ages and then returns message " Error loading documents ". In the same time I'm able to access Authentication menu item without any problem. Note : I'm using MacBook Pro with Catalina 10.15.4 and Safari browser 13.1 回答1: It looks like it's a Firewall which is blocking my access to Database section within Firebase

问题 This time I'm facing a problem with formatting data from Firebase. This is how structure in my database looks: I'm getting it from database using this code: const preObject = document.getElementById('object') var parametryObject = firebase.database() .ref('Parametry_powietrza') .limitToLast(1) .once('value').then(function(snapshot) { var listaParametrow = snapshot.val(); console.log(listaParametrow); preObject.innerText = JSON.stringify(snapshot.val(), null, 3) }); And on my webpage it looks

问题 I have a chat system within my Ionic app that is displayed within a modal window. Within the modal window I have the code below. It seems that after using the app for a while it becomes a bit sluggish. I suspect that it's because I should be unsubscribing from Firebase when I close the modal window. In other words, it seems like a new subscription is being made each time I click the button to open the modal. Is this the case? If so, what should I do? I don't see an unsubscribe option in the

问题 I have a chat system within my Ionic app that is displayed within a modal window. Within the modal window I have the code below. It seems that after using the app for a while it becomes a bit sluggish. I suspect that it's because I should be unsubscribing from Firebase when I close the modal window. In other words, it seems like a new subscription is being made each time I click the button to open the modal. Is this the case? If so, what should I do? I don't see an unsubscribe option in the