title: How to back from Fragment to primary Fragment with back button in Navigation Drawer Activity
body: <p>I have Navigation Drawer Activity. I attached Fragment A(primary fragment). And in my Navigation Drawer menu i have other Fragments(B, C, D..). Now when i go to some Fragment from menu(B, C, D) and i press back button what happens is that app exit . What i want is when i press back button  to back to Fragment A, than when i press back button again to exit app.</p>
  
  <p>Here is my main activity:</p>
  
  <pre><code> @Override
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
      Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
  
      setSupportActionBar(toolbar);
  
      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();
  
     // FRAGMENT A starting fagment   
      NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
      navigationView.setNavigationItemSelectedListener(this);
  
      FragmentMainPage pocetnaFragment = new FragmentMainPage();
      FragmentManager fragmentManager = getSupportFragmentManager();
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
      fragmentTransaction.add(R.id.relativeLayoutZaFragment, pocetnaFragment, "1");
      fragmentTransaction.commit();     
  
      getSupportActionBar().setTitle("Auto magazin");
  
      ActionBar.LayoutParams p = new ActionBar.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
      p.gravity = Gravity.LEFT;
  
      view = getLayoutInflater().inflate(R.layout.action_bar, null);
  
      ActionBar.LayoutParams params = new ActionBar.LayoutParams(
              ActionBar.LayoutParams.WRAP_CONTENT,
              ActionBar.LayoutParams.MATCH_PARENT,
              Gravity.LEFT);
  
      TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
  
      Title.setText("Auto magazin");
  
      getSupportActionBar().setCustomView(view,params);
      getSupportActionBar().setDisplayShowCustomEnabled(true); //show custom title
      getSupportActionBar().setDisplayShowTitleEnabled(false); //hide the default title
  }
  
  boolean doubleBackToExitPressedOnce = false;
  
  @Override
  public void onBackPressed() {
      DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
      assert drawer != null;
  
  
      if (drawer.isDrawerOpen(GravityCompat.START)) {
          drawer.closeDrawer(GravityCompat.START);
          return;
      }
      else if (doubleBackToExitPressedOnce) {
          super.onBackPressed();
          return;
      }
  
      this.doubleBackToExitPressedOnce = true;
  
      Toast.makeText(this, "Pritisnite još jednom za izlaz", Toast.LENGTH_SHORT).show();
  
      new Handler().postDelayed(new Runnable() {
          @Override
          public void run() {
              doubleBackToExitPressedOnce = false;
          }
      }, 2000);
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {        
      getMenuInflater().inflate(R.menu.main, menu);
  
      return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item)
  {
      int id = item.getItemId();
  
      if (id == R.id.podesavanja) {
  
          startActivity(new Intent(this, Podesavanja.class));
          return true;
      }
  
      return super.onOptionsItemSelected(item);
  }
  
  @SuppressWarnings("StatementWithEmptyBody")
  @Override
  
   // Other fragments, I want to back to Fragment A when click on back button
   // when i am in this Fragments
  public boolean onNavigationItemSelected(MenuItem item)   {
      // Handle navigation view item clicks here.
      int id = item.getItemId();
  
      if (id == R.id.pocetna)   {
  
          FragmentMainPage fragmentMainPage = new FragmentMainPage() ;
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                 , fragmentMainPage, fragmentMainPage.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Auto magazin");
      }
      else if (id == R.id.info) {
           FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
           FragmentManager  manager = getSupportFragmentManager();
           manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Info");
  
          Bundle bundle = new Bundle();
  
          bundle.putString("href","http://www.magazinauto.com/category/info/");
          bundle.putString("title", "Info");
          fragmentMenuPages.setArguments(bundle);
  
      }
      else if (id == R.id.testovi)  {
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Testovi");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/testovi/");
  
          bundle.putString("title", "Testovi");
          fragmentMenuPages.setArguments(bundle);
  
      }
      else if (id == R.id.promocije)  {
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager  manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Promocije");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/promocije/");
          bundle.putString("title", "Promocije");
          fragmentMenuPages.setArguments(bundle);
      }
  
      else if (id == R.id.svet) {
  
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager  manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Svet");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/svet/");
          bundle.putString("title", "Svet");
          fragmentMenuPages.setArguments(bundle);
  
      }
  
      else if (id == R.id.istorija)  {
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title); // OTHER FRAGMENTS
          Title.setText("Istorija");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/istorija/");
          bundle.putString("title", "Istorija");
          fragmentMenuPages.setArguments(bundle);
  
      }
      else if (id == R.id.tehnika)  {
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Tehnika");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/tehnika/");
          bundle.putString("title", "Tehnika");
          fragmentMenuPages.setArguments(bundle);
      }
  
      else if (id == R.id.transport) {
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Transport");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/transport/");
          bundle.putString("title","Transport");
          fragmentMenuPages.setArguments(bundle);
  
      }
      else if (id == R.id.moto)  {
  
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Moto");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/moto/");
          bundle.putString("title","Moto");
          fragmentMenuPages.setArguments(bundle);
      }
  
      else if (id == R.id.lifeStyle)  {
  
          FragmentMenuPages fragmentMenuPages = new FragmentMenuPages();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView title = (TextView) view.findViewById(R.id.actionbar_title);
          title.setText("Lifestyle");
  
          Bundle bundle = new Bundle();
          bundle.putString("href", ("http://www.magazinauto.com/category/life-style/"));
  
          bundle.putString("title","Lifestyle");
          fragmentMenuPages.setArguments(bundle);
      }
  
      else if (id == R.id.daliznate) {
          FragmentDaLIPage fragmentMenuPages = new FragmentDaLIPage();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  , fragmentMenuPages, fragmentMenuPages.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Da li znate?");
  
  
          Bundle bundle = new Bundle();
          bundle.putString("href", "http://www.magazinauto.com/category/da-li-znate/");
          bundle.putString("title","Da li znate?");
          fragmentMenuPages.setArguments(bundle);
      }
  
      else if (id == R.id.redakcija)  {
          RedakcijaFragment redakcijaFragment = new RedakcijaFragment();
          FragmentManager manager = getSupportFragmentManager();
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  ,redakcijaFragment, redakcijaFragment.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
  
          Title.setText("Redakcija");
  
      }
  
      else if (id == R.id.kontakt)  {
          KontaktFragment kontaktFragment = new KontaktFragment();
  
          FragmentManager manager = getSupportFragmentManager();
  
          manager.beginTransaction().replace(R.id.relativeLayoutZaFragment
                  ,kontaktFragment, kontaktFragment.getTag()).commit();
  
          TextView Title = (TextView) view.findViewById(R.id.actionbar_title);
          Title.setText("Kontakt");
      }
  
      else {
          return super.onOptionsItemSelected(item);
      }
  
      DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
      drawer.closeDrawer(GravityCompat.START);
      return true;
  }
  </code></pre>
  
  <p>}</p>