title: Why does FragmentTransaction.hide() not hide my fragment?
body: <p>I'm making an Android app that uses the action bar tabs (I'm using the support library's action bar), each associated with a fragment that I generate dynamically.</p>
  
  <p>The idea is to show the fragment whenever its tab is selected using FragmentTransaction.show() and hide the deselected tab with FragmentTransaction.hide(), but when I do this, the 'hidden' fragment simply becomes slightly greyed out. </p>
  
  <p>The fact that the UI indicates that something is different by greying out the hidden tab might suggest that this is intentional behavior, but I was under the impression that hide() actually hid the tabs.</p>
  
  <p>What am I doing wrong and what should I do? The code for the tab listener is below if necessary:</p>
  
  <pre><code>public class VarientTabListener implements ActionBar.TabListener
  {
      VarientFragment Arch_Fragment;
      VarientFragment Plane_Fragment;
      ActionBarActivity parent;
  
      public VarientTabListener(ActionBarActivity act)
      {
          parent = act;
      }
  
      @Override
      public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft)
      {
          //Work out which tab was selected
          if (tab.getText() == "Arch_Tab")
          {
              //Create the tab if it doesn't exist
              if (Arch_Fragment == null)
              {
                  Arch_Fragment = (VarientFragment) Fragment.instantiate(parent, VarientFragment.class.getName());
                  ft.add(android.R.id.content, Arch_Fragment, "Arch");
              }
              //Otherwise show it
              else
              {
                  ft.show(Arch_Fragment);
              }
          }
          else if (tab.getText() == "Plane_Tab")
          {
              if (Plane_Fragment == null)
              {
                  Plane_Fragment = (VarientFragment) Fragment.instantiate(parent, VarientFragment.class.getName());
                  ft.add(android.R.id.content, Plane_Fragment, "Plane");
              }
              else
              {
                  ft.show(Plane_Fragment);
              }
          }
      }
  
      @Override
      public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft)
      {
          if (tab.getText() == "Arch_Tab")
          {
              if (Arch_Fragment != null)
              {
                  //Hide the unselected tab
                  ft.hide(Arch_Fragment);
              }
  
          }
          else if (tab.getText() == "Plane_Tab")
          {
              if (Plane_Fragment != null)
              {
                  ft.hide(Plane_Fragment);
              }
          }
      }
  
      @Override
      public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft)
      {
  
      }
  }
  </code></pre>