How to change fragments using Android navigation drawer

Question

I know these types of question have already been here but still I have not found my answer for this question:

• I have created an application and used navigation drawer that has been created AUTOMATICALLY by the app (AndroidStudio)

Here's what I have:

@Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     mNavigationDrawerFragment = (NavigationDrawerFragment)             getFragmentManager().findFragmentById(R.id.navigation_drawer);     mTitle = getTitle();      // Set up the drawer.     mNavigationDrawerFragment.setUp(             R.id.navigation_drawer,             (DrawerLayout) findViewById(R.id.drawer_layout)); }  @Override public void onNavigationDrawerItemSelected(int position) {     // update the main content by replacing fragments     FragmentManager fragmentManager = getFragmentManager();     fragmentManager.beginTransaction()             .replace(R.id.container, PlaceholderFragment.newInstance(position + 1))             .commit(); }  public void onSectionAttached(int number) {     switch (number) {         case 1:              break;         case 2:              break;         case 3:              break;     } } 

And some more here:

    public static PlaceholderFragment newInstance(int sectionNumber) {         PlaceholderFragment fragment = new PlaceholderFragment();         Bundle args = new Bundle();         args.putInt(ARG_SECTION_NUMBER, sectionNumber);         fragment.setArguments(args);         return fragment;     }      public PlaceholderFragment() {     }      @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container,             Bundle savedInstanceState) {         View rootView = inflater.inflate(R.layout.fragment_main, container, false);         return rootView;     }      @Override     public void onAttach(Activity activity) {         super.onAttach(activity);         ((MainActivity) activity).onSectionAttached(                 getArguments().getInt(ARG_SECTION_NUMBER));     } } 

I want to display another fragment using the button in navigation drawer. I want to use this code so please do not send me any guides or tutorials making their own drawers..

The question is, what do I put in case 1: case 2: and case 3: in case I want to open another fragment? Thanks.

One more question:

• How do I add more fragments and transactions? This doesn't work-

  Fragment fragment = new MyFragment1(); Fragment frag = new MyFragment2(); FragmentManager fragmentManager = getFragmentManager(); switch(position) {     case 0:         fragment = new MyFragment1();         break;     case 1:         frag = new MyFragment2();          break; } fragmentManager.beginTransaction()         .replace(R.id.container, fragment).commit(); 

Answer 1

You should just put a switch statement into the onNavigationDrawerItemSelected method.

Something like this should work:

public void onNavigationDrawerItemSelected(int position) {     // update the main content by replacing fragments     Fragment fragment;     FragmentManager fragmentManager = getFragmentManager(); // For AppCompat use getSupportFragmentManager     switch(position) {         default:         case 0:             fragment = new MyFragment1();             break;         case 1:             fragment = new MyFragment2();             break;     }     fragmentManager.beginTransaction()         .replace(R.id.container, fragment)         .commit(); } 

This is just done quickly but I think it should work

Answer 2

I solved this problem over inflater:

    @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container,                              Bundle savedInstanceState) {         View rootView;         switch(getArguments().getInt(ARG_SECTION_NUMBER)) {             case 1:                 rootView = inflater.inflate(R.layout.fragment_obj_detail, container, false);                 break;             case 2:                 rootView = inflater.inflate(R.layout.fragment_obj_list, container, false);                 break;             case 3:                 rootView = inflater.inflate(R.layout.fragment_obj_list, container, false);                 break;             case 4:                 rootView = inflater.inflate(R.layout.fragment_about, container, false);                 break;             default:                 rootView = inflater.inflate(R.layout.fragment_obj_list, container, false);         }         return rootView;     }