UserHelper

public class UserHelper {

    private static String status;

    public static void changeStatus(String userId, String status) {
        DatabaseReference databaseReference = FirebaseConfig.getFirebaseReference();
        databaseReference = databaseReference.child("users").child(userId).child("status");
        databaseReference.setValue(status);
    }

    public static String getStatus(String userId) {
        status = "";
        DatabaseReference databaseReference = FirebaseConfig.getFirebaseReference();
        databaseReference = databaseReference.child("users").child(userId).child("status");
        databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                if (dataSnapshot != null) {
                    status = dataSnapshot.getValue(String.class);
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
            }
        });
        return status;
    }

    public static User getLoggedUser(Context context) {
        final User loggedUser = new User();
        Preferences preferences = new Preferences(context);
        final String loggedUserId = preferences.getLoggedUserId();
        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
        databaseReference = databaseReference.child("users").child(loggedUserId);
        databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()) {
                    User user = dataSnapshot.getValue(User.class);
                    loggedUser.setId(user.getId());
                    loggedUser.setName(user.getName());
                    loggedUser.setEmail(user.getEmail());
                    loggedUser.setPhone(user.getPhone());
                    loggedUser.setStatus(user.getStatus());
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

        return loggedUser;
    }

    public static void updateLoggedUserName(Context context) {
        final Preferences preferences = new Preferences(context);
        final String loggedUserId = preferences.getLoggedUserId();
        DatabaseReference databaseReference = FirebaseConfig.getFirebaseReference();
        databaseReference = databaseReference.child("users").child(loggedUserId);
        databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                User user = dataSnapshot.getValue(User.class);
                preferences.setLoggedUserName(user.getName());
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
            }
        });
    }
}