Firebase realtime database how to get a child record without the key-CodePudding

I have a Firebase database with a "users" node that has some children and I would like to retrieve the "type" field for a specific user, but I don't know what that user's key would be. I have the following data structure:

users
    -MlHrU3_UgMzrU3IpfOW
       email: 
          "[email protected]"
       tipo: 
           "Aluno"

I tried to do it like this but it always returns null

final String[] tipoUserBD = new String[1];
    database = FirebaseDatabase.getInstance().getReference("users");
    database.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            list.clear();
            for(DataSnapshot dataSnapshot : snapshot.getChildren()){
                if(dataSnapshot.child("email").getValue(String.class).equals(user.getEmail())) {
                    tipoUser[0] = dataSnapshot.child("tipo").getValue().toString();
                }
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });

CodePudding user response：

If you know the key of the user (I know you don't, but let's assume you do in some other case), you can read their profile and log their type with:

database = FirebaseDatabase.getInstance().getReference("users");
database.child("-MlHrU3_UgMzrU3IpfOW").addValueEventListener(new ValueEventListener() {
         //