Using Navigation Drawer with other activities

How do I make an option that when I'm currently in an activity and I press in the drawer again on the button that send me to the same activity it will just close the drawer? there is any option to check if I'm right now in a specific activity? here is my main page with the drawer:

public class Main_Page extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

@Override protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main__page);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

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.setDrawerListener(toggle);
toggle.syncState();

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);

}

@Override public void onBackPressed() { DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); if (drawer.isDrawerOpen(GravityCompat.START)) { drawer.closeDrawer(GravityCompat.START); } else { super.onBackPressed(); }

}

@SuppressWarnings("StatementWithEmptyBody") @Override public boolean onNavigationItemSelected(MenuItem item) { Intent Home=new Intent(Main_Page.this,Main_Page.class); Intent Settings = new Intent(Main_Page.this,Settings.class); int id = item.getItemId();

if (id == R.id.Main_App)
    startActivity(Home);
else if (id== R.id.nav_Settings)
    startActivity(Settings);
else if (id == R.id.Nav_Log_Out) {
            super.onBackPressed();
}

DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;

} }