title: Up Navigation in Fragments with Navigation Drawer
body: <p>I want to use a single activity called MainActivity which has a drawer layout and main content container(using FrameLayout). The drawer layout for now is just a normal ListView which has only two items for now. I have made two Fragments for each of those items. The first item is Home and the second is Saved. 
  When the MainActivity onCreate() is called I replace the container with the HomeFragment and from there I can use the Drawer to Navigate to the SavedFragment.
  The Navigation works perfectly and has no issues. 
  The task which I want to achieve is that whenever I go to SavedFragment by clicking the second item on the Drawer, the Hamburger icon should change to back button/up button. 
  I managed to change it by going through a lot of StackOverflow topics on the same issue, but I am not able to add click event on that. It doesn't listen for a click. I read some very good stuff on StackOverflow and expected that it would work for me as well, but maybe I am wrong somewhere in my code. So I am sharing the code over here:</p>
  
  <p>MainActivity (Only Activity in the application) Code</p>
  
  <pre><code>public class MainActivity extends ActionBarActivity implements AdapterView.OnItemClickListener {
  
  
  Toolbar toolbar;
  private ActionBarDrawerToggle mDrawerToggle;
  private DrawerLayout mDrawerLayout;
  private ListView listView;
  Fragment mFragment;
  ArrayList&lt;NavigationDataRecord&gt; drawerRecord;
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      toolbar = (Toolbar) findViewById(R.id.toolbar);
      listView = (ListView) findViewById(R.id.drawer_left);
      listView.setOnItemClickListener(this);
      drawerRecord = new ArrayList&lt;NavigationDataRecord&gt;();
      drawerRecord.add(new NavigationDataRecord(R.mipmap.ic_home_grey600_24dp, "Home"));
      drawerRecord.add(new NavigationDataRecord(R.mipmap.ic_save_grey600_24dp, "Saved"));
      CustomAdapter adapter = new CustomAdapter(this, R.layout.list_row, drawerRecord);
      listView.setAdapter(adapter);
  
      setSupportActionBar(toolbar);
      getSupportActionBar().setDisplayHomeAsUpEnabled(true);
      getSupportActionBar().setHomeButtonEnabled(true);
  
  
      mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
  
      mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar,
              R.string.app_name, R.string.app_name) {
  
          /** Called when a drawer has settled in a completely open state. */
          public void onDrawerOpened(View drawerView) {
              super.onDrawerOpened(drawerView);
              invalidateOptionsMenu();
          }
  
          /** Called when a drawer has settled in a completely closed state. */
          public void onDrawerClosed(View view) {
              super.onDrawerClosed(view);
              invalidateOptionsMenu();
          }
      };
  
  
          mFragment = new HomeFragment();
          getSupportFragmentManager().beginTransaction().replace(R.id.container, mFragment).commit();
  
          mDrawerToggle.setDrawerIndicatorEnabled(true);
          mDrawerLayout.setDrawerListener(mDrawerToggle);
  
  
  }
  
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.menu_main, menu);
      return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
  
      int id = item.getItemId();
  
    if (id == R.id.action_settings) {
          return true;
      }
  
  return super.onOptionsItemSelected(item);
  
  }
  
  
  
  
  @Override
  protected void onPostCreate(Bundle savedInstanceState) {
      super.onPostCreate(savedInstanceState);
      mDrawerToggle.syncState();
  }
  
  @Override
  public void onConfigurationChanged(Configuration newConfig) {
      super.onConfigurationChanged(newConfig);
      mDrawerToggle.onConfigurationChanged(newConfig);
  }
  
  @Override
  public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) {
  
  
  
      switch (position) {
          case 0:
              mFragment = new HomeFragment();
              break;
  
          case 1:
              mFragment = new SavedFragment();
              break;
  
          default:
             break;
  
      }
  
      getSupportFragmentManager().beginTransaction().replace(R.id.container,mFragment).addToBackStack(null).commit();
      mDrawerLayout.closeDrawer(listView);
  
  }}
  </code></pre>
  
  <p>SavedFragment Code</p>
  
  <pre><code>public class SavedFragment extends Fragment {
  
  
  List&lt;SavedInformation&gt; list;
  RecyclerView cardView;
  
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
  
  }
  
  @Override
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
      View view = inflater.inflate(R.layout.saved_fragment, container, false);
      list = new ArrayList&lt;SavedInformation&gt;();
      makeCardList();
      cardView = (RecyclerView) view.findViewById(R.id.cardList);
      //cardView.setHasFixedSize(true);
      LinearLayoutManager llm = new LinearLayoutManager(getActivity());
      llm.setOrientation(LinearLayoutManager.VERTICAL);
      cardView.setLayoutManager(llm);
      SavedInformationAdapter adapter = new SavedInformationAdapter(list, getActivity());
      cardView.setAdapter(adapter);
  
  
      return view;
  }
  
  private void makeCardList() {
      DatabaseAdapter adapter = new DatabaseAdapter(getActivity());
      Cursor cursor = adapter.getData();
  
      while (cursor.moveToNext()) {
          SavedInformation information = new SavedInformation();
          information.setUsername(cursor.getString(0));
          information.setDomainName(cursor.getString(1));
          information.setImageURL(cursor.getString(2));
          list.add(information);
  
      }
  }}
  </code></pre>
  
  <p>I tried a few things on these, but had no luck so I am posting the clean version of the code on which I tried implementing solutions. </p>
  
  <p>I am sure that those solutions were correct, but I am unable to understand Why those did not work for me. </p>
  
  <p>I applied the solution given here: <a href="https://stackoverflow.com/questions/17258020/switching-between-android-navigation-drawer-image-and-up-caret-when-using-fragme">Switching between Android Navigation Drawer image and Up caret when using fragments</a></p>