How get the number of documents firebase?

Question

How i can get number of documents from firebase realtime database? I find answers only for firebase firestore.

Answer 1

If you want to get the number of your children in a Firebase Realtime Database, you have to use getChildrenCount() on a DataSnapshot object. I would recommend to read in the Firebase Docs for more information.

Here is also an example on how to use it.

The following Code example is also from the Firebase Docs. It's a bit modified.

final FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference ref = database.getReference();

// Attach a listener to print out the number of total children
ref.addValueEventListener(new ValueEventListener() {
  @Override
  public void onDataChange(DataSnapshot dataSnapshot) {
    long count = dataSnapshot.getChildrenCount();
    System.out.println(count);
  }

  @Override
  public void onCancelled(DatabaseError databaseError) {
    System.out.println("The read failed: " + databaseError.getCode());
  }
});