@Override
  public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    AdapterView.AdapterContextMenuInfo info;
    try {
      // Casts the incoming data object into the type for AdapterView objects.
      info = (AdapterView.AdapterContextMenuInfo) menuInfo;
    } catch (ClassCastException e) {
      // If the menu object can't be cast, logs an error.
      Log.e(TAG, "bad menuInfo", e);
      return;
    }
    StrngData strngdata = strngdata_adapter.getItem(info.position);

    menu.setHeaderTitle("Action: " + strngdata.toString());

    getActivity().getMenuInflater().inflate(R.menu.string_list_item_context, menu);
  }
  @Override
  public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info =
        (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    int position = info.position;
    StrngData strngdata = strngdata_adapter.getItem(position);

    switch (item.getItemId()) {
      case R.id.menu_item_edit_string:
        Intent i = new Intent(getActivity(), StrngDataActivity.class);
        i.putExtra(StrngDataFragment.EXTRA_RACKET_ID, mRacket.getId());
        i.putExtra(StrngDataFragment.EXTRA_STRINGDATA_ID, strngdata.getId());
        startActivityForResult(i, REQUEST_STRING);
        return true;
      case R.id.menu_item_delete_string:
        alertMessageDeleteString(strngdata);
        return true;
    }
    return super.onContextItemSelected(item);
  }