How we can retrieve uid user name and the uid user child value in RecyclerView in Android Java?

Question

How can we access all UID users name and the UID users child value in Firebase database?

I have uploaded the pic of my database

I also use RecyclerView you tell me about Firebase query I want to retrieve data with FirestoreRecyclerOptions query:

I want to access name of users and the amount value as shown in fig like this

name:600

Answer 1

To get all user names, of all User objects that exist under "Users" node, please use the following lines of code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersRef = rootRef.child("Users");
    productsRef.get().addOnCompleteListener(new OnCompleteListener<DataSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DataSnapshot> task) {
        if (task.isSuccessful()) {
            for (DataSnapshot ds : task.getResult().getChildren()) {
                String name = ds.child("name").getValue(String.class);
                Log.d(TAG, name);
            }
        } else {
            Log.d(TAG, task.getException().getMessage()); //Don't ignore potential errors!
        }
    }
});

Because there are several objects within the "Users" node, first you need to get a reference to that node, attach a listener and then loop through the results. The result in the logcat will be:

jm
...

If you want to use the Firebase-UI library, then simply pass the "usersRef" to the FirestoreRecyclerOptions's setQuery() method, as explained in my answer from the following post:

• How to display data from Firestore in a RecyclerView with Android?