the onCreate function:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_apps);
        tvLoggedUsername = findViewById(R.id.tvLoggedUsername);
        tvAccessGrade = findViewById(R.id.tvAccessGrade);
        tvDepartment = findViewById(R.id.tvDepartment);
        Intent intent = getIntent();
        String username = intent.getStringExtra("username");
        String grade = intent.getStringExtra("grade");
        String department = intent.getStringExtra("department");
        tvLoggedUsername.setText(getString(R.string.current_logged_user, username));
        tvAccessGrade.setText(getString(R.string.current_access_grade, grade));
        tvDepartment.setText(getString(R.string.current_department, getDepartmentName(Integer.parseInt(department))));
        loadApps();
        loadListView();
        addClickListener();
    }