title: android eclipse how to use intent to show the second window in default navigation drawer
body: <p>so guys i am new in android programming and i also have no background in java.</p>
  
  <p>my problem : is my code possible?</p>
  
  <p>this is the default navigation drawer project code, i added code intent but when i run the app i get "unfortunately the app has stopped" it is on switch case 1. what im trying to do is when the user clicked the section1 drawer the window for section 1 will show.</p>
  
  <p>sorry newbie here.</p>
  
  <pre><code>package com.example.example;
  
  public class MainActivity extends Activity implements NavigationDrawerFragment.NavigationDrawerCallbacks {
  
      /**
       * Fragment managing the behaviors, interactions and presentation of the
       * navigation drawer.
       */
      private NavigationDrawerFragment mNavigationDrawerFragment;
  
      /**
       * Used to store the last screen title. For use in
       * {@link #restoreActionBar()}.
       */
      private CharSequence mTitle;
  
      @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:
              mTitle = getString(R.string.title_section1);
              Intent intent = new Intent(MainActivity.this, NavigationDrawerFragment.class);
              startActivity(intent);
              break;
          case 2:
              mTitle = getString(R.string.title_section2);
              break;
          case 3:
              mTitle = getString(R.string.title_section3);
              break;
          }
      }
  
      public void restoreActionBar() {
          ActionBar actionBar = getActionBar();
          actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
          actionBar.setDisplayShowTitleEnabled(true);
          actionBar.setTitle(mTitle);
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          if (!mNavigationDrawerFragment.isDrawerOpen()) {
              // Only show items in the action bar relevant to this screen
              // if the drawer is not showing. Otherwise, let the drawer
              // decide what to show in the action bar.
              getMenuInflater().inflate(R.menu.main, menu);
              restoreActionBar();
              return true;
          }
          return super.onCreateOptionsMenu(menu);
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
          if (id == R.id.action_settings) {
              return true;
          }
          return super.onOptionsItemSelected(item);
      }
  
      /**
       * A placeholder fragment containing a simple view.
       */
      public static class PlaceholderFragment extends Fragment {
          /**
           * The fragment argument representing the section number for this
           * fragment.
           */
          private static final String ARG_SECTION_NUMBER = "section_number";
  
          /**
           * Returns a new instance of this fragment for the given section number.
           */
          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));
          }
      }
  
  }
  </code></pre>