android-OptionMenu

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
      super.onCreateOptionsMenu(menu);

      menu.add(0, MENU_UPDATE, Menu.NONE, R.string.menu_update);
      menu.add(0, MENU_PREFERENCES, Menu.NONE, R.string.menu_preferences);

      return true;
    }

public boolean onOptionsItemSelected(MenuItem item) {
      super.onOptionsItemSelected(item);

      switch (item.getItemId()) {
        case (MENU_UPDATE): {
          refreshEarthquakes();
          return true; 
        }
        case (MENU_PREFERENCES): {
          Intent i = new Intent(this, Preferences.class);
          startActivityForResult(i, SHOW_PREFERENCES);
          return true;
        }
      } 
      return false;
    }

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);

      if (requestCode == SHOW_PREFERENCES)
        if (resultCode == Activity.RESULT_OK) {
          updateFromPreferences();
          refreshEarthquakes();
        } 
    }