firebase-realtime-database

问题 I have an Android service that calls this at onCreate : FirebaseDatabase database = FirebaseDatabase.getInstance(); database.getReference(".info/connected").addValueEventListener(new ValueEventListener() { @Override public void onDataChange(@NonNull DataSnapshot snapshot) { Log.d(TAG, "connected: " + snapshot.getValue(Boolean.class)); } @Override public void onCancelled(@NonNull DatabaseError error) { Log.w(TAG, "Failed to read value.", error.toException()); } }); I've noticed that when I do

问题 I'm using GeoFire and trying to fetch only 3 results that satisfy some conditions. This it my case and it doesn't stop observer. There are several thousands results and I get it all but I need only 3. I based on this answer but it does't work in my case as you can see. Please can somebody help? var newRefHandle: FIRDatabaseHandle? var gFCircleQuery: GFCircleQuery? func findFUsersInOnePath(location: CLLocation, radius: Int, indexPath: String, completion: @escaping () -> ()){ var ids = 0 let

问题 I'm writing a program, where I'm fetching data from Firebase Database using FirebaseRecyclerAdapter I'm trying to implement a functionality to add 20 records on every scroll and to achieve same, I'm using: mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users"); queryUsersData = mDatabaseReference.orderByChild("timestamp").limitToFirst(20); Now, the issue is I'm getting first 20 records, but on scroll I'm not getting next 20 records, as on every scroll, I want to get

问题 I'm writing a program, where I'm fetching data from Firebase Database using FirebaseRecyclerAdapter I'm trying to implement a functionality to add 20 records on every scroll and to achieve same, I'm using: mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users"); queryUsersData = mDatabaseReference.orderByChild("timestamp").limitToFirst(20); Now, the issue is I'm getting first 20 records, but on scroll I'm not getting next 20 records, as on every scroll, I want to get

问题 I'm just trying to write a message in database, then I have this error when I run the app As I know I already added necesary dependencies in my gradle gradle at module level, I already added Firebase Core, Firebase database and so on: dependencies { implementation fileTree(include: ['*.jar'], dir: 'libs') implementation 'com.android.support:appcompat-v7:28.0.0-rc02' implementation 'com.android.support:design:28.0.0-rc02' implementation 'com.android.support.constraint:constraint-layout:1.1.3'

问题 I'm just trying to write a message in database, then I have this error when I run the app As I know I already added necesary dependencies in my gradle gradle at module level, I already added Firebase Core, Firebase database and so on: dependencies { implementation fileTree(include: ['*.jar'], dir: 'libs') implementation 'com.android.support:appcompat-v7:28.0.0-rc02' implementation 'com.android.support:design:28.0.0-rc02' implementation 'com.android.support.constraint:constraint-layout:1.1.3'

问题 I am building a cross-platform application within Xamarin with realtime Firebase database integration. I am using the Firebase C# library FirebaseDatabase.net. Within the FibrebaseDatabase.net documentation, to enable real-time streaming it notes to call for example: var firebase = new FirebaseClient("https://dinosaur-facts.firebaseio.com/"); var observable = firebase .Child("dinosaurs") .AsObservable<Dinosaur>() .Subscribe(d => Console.WriteLine(d.Key)); However, in order to allow for

问题 I am building a cross-platform application within Xamarin with realtime Firebase database integration. I am using the Firebase C# library FirebaseDatabase.net. Within the FibrebaseDatabase.net documentation, to enable real-time streaming it notes to call for example: var firebase = new FirebaseClient("https://dinosaur-facts.firebaseio.com/"); var observable = firebase .Child("dinosaurs") .AsObservable<Dinosaur>() .Subscribe(d => Console.WriteLine(d.Key)); However, in order to allow for

问题 I am building a cross-platform application within Xamarin with realtime Firebase database integration. I am using the Firebase C# library FirebaseDatabase.net. Within the FibrebaseDatabase.net documentation, to enable real-time streaming it notes to call for example: var firebase = new FirebaseClient("https://dinosaur-facts.firebaseio.com/"); var observable = firebase .Child("dinosaurs") .AsObservable<Dinosaur>() .Subscribe(d => Console.WriteLine(d.Key)); However, in order to allow for

问题 I have a class called User, which has a function that gets all nearby food trucks using GeoFire. I've used an observeReadyWithBlock to take the truck IDs returned by GeoFire, and get the rest of their information using Firebase. However, when I go to access one of the trucks from my array of Truck objects after adding their name and description, it looks like xCode is telling me the array is empty. I am planning on using this array of nearby trucks in other controller classes, to populate