title: getSupportFragmentManager() contains empty fragments after standby
body: <p>After the device goes on standby, if I call  <code>getSupportFragmentManager()</code> I get a <code>FragmentManager</code> that contains fragments not initialised with all their variables set to <code>null</code>.</p>
  
  <p>Here there is some code:</p>
  
  <pre><code>this.mAdapter = new MyAdapter(getSupportFragmentManager());
  
  this.mPager = (ViewPager) findViewById(R.id.pager);
  this.mPager.setAdapter(mAdapter);
  
  TabPageIndicator titleIndicator = (TabPageIndicator) findViewById(R.id.titles);
  titleIndicator.setViewPager(mPager);
  titleIndicator.setOnPageChangeListener(new OnPageChangeListener()
  {
      @Override
      public void onPageSelected(int position)
      {
          mAdapter.getItem(position).onFocus();
      }
  
      @Override
      public void onPageScrolled(int arg0, float arg1, int arg2)
      {
      }
  
      @Override
      public void onPageScrollStateChanged(int arg0)
      {
      }
  });
  </code></pre>
  
  <p>This is MyAdapter class:</p>
  
  <pre><code>public static class MyAdapter extends FragmentStatePagerAdapter
  {
      ArrayList&lt;ExtendedFragment&gt; tabs = new ArrayList&lt;ExtendedFragment&gt;();
      String[] titles = new String[] { "FRAG1", "FRAG2", "FRAG3", "FRAG4", "FRAG5", "FRAG6"};
  
      public MyAdapter(FragmentManager fm)
      {
          super(fm);
  
          tabs.add(new frag1());
          tabs.add(new frag2());
          tabs.add(new frag3());
          tabs.add(new frag4());
          tabs.add(new frag5());
          tabs.add(new frag6());
      }
  
      @Override
      public int getCount()
      {
          return tabs.size();
      }
  
      @Override
      public ExtendedFragment getItem(int position)
      {
          return tabs.get(position);
      }
  
      @Override
      public CharSequence getPageTitle(int position)
      {
          return titles[position];
      }
  }
  </code></pre>
  
  <p>The <code>ExtendedFragment</code> implements the method <code>onFocus()</code>, each fragment override that because i need to do some actions when a tab gets the focus. When I resume the device from standby and <code>onFocus()</code> is fired, if I try to get the <code>View</code> using <code>getView()</code> I get <code>null</code>.</p>
  
  <p>Why my view is null?</p>