@Override
  public View onCreateView(
      LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.main_fragment, container, false);
    btnUpdate = (Button) v.findViewById(R.id.btnUpdate);
    account = (EditText) v.findViewById(R.id.card_account_field);
    account.setText(AccountStorage.GetAccount(getActivity()));
    account.addTextChangedListener(new AccountUpdater());

    btnUpdate.setOnClickListener(
        new View.OnClickListener() {
          @Override
          public void onClick(View view) {
            updateKey(view);
          }
        });
    return v;
  }
 @Override
 public void afterTextChanged(Editable s) {
   String account = s.toString();
   AccountStorage.SetAccount(getActivity(), account);
 }