How to count children in Firebase Database (Android)

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I need to count all the children that are in my Firebase database.

This is the Firebase structure:

Level 1 - CHILD1 - - subchild1 - - subchild2 - CHILD2 - - subchild 1

How can I count the CHILDs from level 1? (In this example it would need to return 2...)

Try This

FirebaseDatabase db = FirebaseDatabase.getInstance();
DatabaseReference ref = db.getReference();

ref.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
    Log.e(dataSnapshot.getKey(),dataSnapshot.getChildrenCount() + "");
}

@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {

}

@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {

}

@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {

}

@Override
public void onCancelled(DatabaseError databaseError) {

}
});

we will learn how in firebase get data by key android studio and how to count the number of Duration: 8:18 Posted: Jul 23, 2018 In this video tutorial#63 we will learn how in firebase get data by key android studio and how to count the number of children of a node in firebase database and also you will learn that In

Query the first level and then in your SnapShot, use : getChildrenCount().

So the query will be something like this:

myRef.child("level1").child("subchild1"). // Your listener after

Check this link.

And here.

The push() method generates a unique key every time a new child is added to the how you could retrieve a list of a user's top posts sorted by their star count:. android firebase - get childrens count. Here is my Firebase data Firebase android count children and store it in a variable. 1.

DatabaseReference mDatabaseRef = FirebaseDatabase.getInstance().getReference();
mDatabaseRef.child("level1").addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                   long count= dataSnapshot.getChildrenCount();

                }  
             });

You can get the child count via firebase_node. once('value', function(snapshot) { alert('Count: ' + snapshot. numChildren()); }); But I believe this fetches the entire sub-tree of that node from the server. Firebase doesn't currently have a way to count children without loading data, but we do plan to add it. For now, one solution would be to maintain a counter of the number of children and update it every time you add a new child. You could use a transaction to count items, like in this code tracking upvodes:

This code will help you .

(int)dataSnapshot.getChildrenCount()

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Hi I'm developer in south Korea. I want to initialize objects same as number of child count in Firebase realtime DB. But, I don't know how So, I.. Child Added. The child_added event is typically used when retrieving a list of items from the database. Unlike value which returns the entire contents of the location, child_added is triggered once for each existing child and then again every time a new child is added to the specified path.

How do I read all child key values of a child from Firebase database in Android? Firebase data is written to a FirebaseDatabase reference and retrieved by attaching an asynchronous listener to the reference. The listener is triggered once for the initial state of the data and again anytime the data changes. Note: By default, read and write access to your database is restricted so only authenticated users can read or write

Firebase Android count children/ badge FirebaseDatabase database = FirebaseDatabase.getInstance();; DatabaseReference myRef = database. See the following screenshots: The code: Here, dbRef is the database reference to the parent node. The database structure: For each dbRef of different sports, I have a child node “contacts”.