public class SideNavigation extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

    protected DrawerLayout mDrawer;
    private FrameLayout frameLayout;
    private SharedPreferences sharedPreferences;

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);

        //if the drawer is open, close it.
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        }
        //otherwise, do the default behaviour
        else {
            super.onBackPressed();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        sharedPreferences = getSharedPreferences("UserData", Context.MODE_PRIVATE);

        getLayoutInflater().inflate(R.layout.activity_tests_and_results, frameLayout);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(true);




        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();
        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        onOptionsItemSelected(navigationView.getMenu().findItem(R.id.nav_testing));
        changeItemWiseTextProperties(navigationView.getMenu());
        View headerLayout = navigationView.getHeaderView(0);
        TextView sideNavigationHeader = (TextView)headerLayout.findViewById(R.id.side_navigation_header);
        String name = sharedPreferences.getString("name","");
        sideNavigationHeader.setText(name);

    }