@OnClick(R.id.email_sign_in_button)
    public void btnLogIn() {

        userN = username.getText().toString();
        pass = password.getText().toString();
            if (userN.isEmpty()) {
                username.setError("Username is required");
            } else if (pass.isEmpty()) {
                password.setError("Password is required");
            } else if (pass.length() < 6) {
                password.setError("Password must contains at least 6 characters");
            }
                else
            {
                modelResponse.emailAddress = userN;
                modelResponse.password = pass;
                Call<LoginResponse> call = api.login(modelResponse);
                call.enqueue(new Callback<LoginResponse>() {
                    @Override
                    public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
                        if (response.isSuccessful()) {
//                            LoginResponse hasUser = response.body();
//                            if(hasUser.equals(true)) {
//                                Toast.makeText(LoginActivity.this, "Success", Toast.LENGTH_SHORT).show();
//                                PreferencesManager.setUserId(userN, LoginActivity.this);
//                                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
//                                startActivity(intent);
//                            }
//                            else
//                            {
//                                Toast.makeText(LoginActivity.this, "Error", Toast.LENGTH_SHORT).show();
//
//                            }
                            Toast.makeText(LoginActivity.this, "Success", Toast.LENGTH_SHORT).show();
                        }
                    }
                    @Override
                    public void onFailure(Call<LoginResponse> call, Throwable t) {
                        Toast.makeText(LoginActivity.this, t.getMessage(), Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }