private void signIn(String email, String password) {

        mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {

                if (task.isSuccessful()) {

                    loginProgress.setVisibility(View.INVISIBLE);
                    logBtn.setVisibility(View.VISIBLE);
                    updateUI();

                } else
                    showMessage(task.getException().getMessage());
                logBtn.setVisibility(View.VISIBLE);
                loginProgress.setVisibility(View.INVISIBLE);


            }
        });