Navigation Drawer - back button

Question

I’m trying to get the button back or back from android keep the sequence of Fragments that I’m rendering as chosen option in my side menu (Navigation Drawer), but I’m not succeeding, it always closes the app when I click back and does not return to previous Fragment where it was. I’m doing it this way:

@Override
public boolean onNavigationItemSelected(MenuItem item) {

    int id = item.getItemId();

    switch (id) {
        case R.id.nav_home:
            myFragment = new SliderFragment();
            break;
        case R.id.nav_program:
            myFragment = new ProgramFragment();
            break;
        case R.id.nav_ticket:
            myFragment = new TicketFragment();
            break;
        case R.id.nav_togo:
            myFragment = new HowtogoFragment();
            break;
        case R.id.nav_map:
            myFragment = new MapFragment();
            break;
        case R.id.nav_social:
            myFragment = new SocialFragment();
            break;
        case R.id.nav_festival:
            myFragment = new FestivalFragment();
            break;
        case R.id.nav_contact:
            myFragment = new ContactFragment();
            break;
    }

    setTitle(item.getTitle(););

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

    FragmentManager fragmentManager = getSupportFragmentManager();
    fragmentManager
            .beginTransaction()
            .replace(R.id.content_frame, myFragment)
            .addToBackStack(null)
            .commit();

    return true;
}

And I’m not getting the click of the button come back like 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();
    }
}

How could I keep the button coming back normal? Always returning to the previous Fragment, with the title of the action bar and the corresponding selected menu item?

Answer 1

Instead of Fragmentmanager, use Fragmenttransaction.

Example:

 import android.support.v4.app.FragmentTransaction;

 FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                    ft.replace(R.id.content_frame, myFragment);
                    ft.addToBackStack(null);
                    ft.commit();