title: refresh fragment that gone to activity after back pressed in that activity
body: <p>I have a fragment in a tabbed activity.It redirects from onclicklistener to an activity.After changes made in that activity.User will press back button.So in my fragment i need a listener that is fired after come back from that activity.Or maybe after user made the changes I give user a button to go back to that fragment and reload the fragment meanwhile.I don't know either way.
  i tried onResume() onStart() on every thing didn't work because nothing happened to fragment in that transaction.
  I tried addOnBackStackChangedListener() but it should be placed in the activity not fragment.
  so i don't know what to do?
  thanks for your time</p>
  
  <pre><code>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,
                               final Bundle savedInstanceState) {
          final View rootView = inflater.inflate(R.layout.fragment_history, container, false);
          getFragmentManager().addOnBackStackChangedListener(
                  new FragmentManager.OnBackStackChangedListener() {
                      @Override
                      public void onBackStackChanged() {
                          getFragmentManager().beginTransaction().detach(getTargetFragment()).attach(getTargetFragment()).commit();
                      }
                  });
          //TextView textView = (TextView) rootView.findViewById(R.id.section_label);
          //textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
          return rootView;
      }
  
      @Override
      public void onStart() {
          super.onResume();
          getFragmentManager().beginTransaction().detach(this).attach(this).commit();
      }
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          getFragmentManager().beginTransaction().detach(this).attach(this).commit();
      }
  </code></pre>