Отменить CountDownTimer в Recyclerview ⇐ JAVA

[Anonymous]

У меня есть Recyclerview с countDownTimers, который показывает время, оставшееся до игры, в днях, часах, минутах и ​​секундах. Теперь у меня проблема: когда я выхожу из активности, счетчики countDownTimers все еще работают.
Вот мой адаптер:
Public class RvAdapterShowVsTeamChallenges extends RecyclerView.Adapter {

private Boolean boFirstTime = true;

private int [] ayColors = {R.drawable.circle_red,R.drawable.circle_purple,R.drawable.circle_orange,R.drawable.circle_blue,R.drawable.circle_tile};

private Context context;

private CountDownTimer countDownTimerTest;

private DatabaseWrite databaseWrite;

private SharedPrefs sharedPrefs;

public RvAdapterShowVsTeamChallenges(final Context context)
{
this.context = context;
}

public class ViewHolderClass extends RecyclerView.ViewHolder{

private TextView txtChallenger;
private TextView txtOponnent;
private TextView txtChallengerScore;
private TextView txtOponnentScore;
private TextView txtTime;

private TextView txtChallengerLetters;
private TextView txtOponnentLetters;

private ProgressBar prgChallenger;
private ProgressBar prgOponnent;

public ViewHolderClass(View itemView) {
super(itemView);

sharedPrefs = new SharedPrefs(context);

txtChallenger = (TextView) itemView.findViewById(R.id.txtChallenger);
txtOponnent = (TextView) itemView.findViewById(R.id.txtOponnent);

txtChallengerScore = (TextView) itemView.findViewById(R.id.txtChallengerScore);
txtOponnentScore = (TextView) itemView.findViewById(R.id.txtOponnentScore);

txtChallengerLetters = (TextView)itemView.findViewById(R.id.txtChallengerLetter);
txtOponnentLetters = (TextView)itemView.findViewById(R.id.imgOponnent);

txtTime = (TextView) itemView.findViewById(R.id.txtTime);

prgChallenger = (ProgressBar) itemView.findViewById(R.id.prgTimeLeft);
prgOponnent = (ProgressBar) itemView.findViewById(R.id.prgOponnent);

}
}

@Override
public ViewHolderClass onCreateViewHolder(final ViewGroup parent, final int viewType) {

View itemview1 = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_show_vs_team_challenges,null);

if(boFirstTime)
{
for(int i=0; i

Подробнее здесь: https://stackoverflow.com/questions/409 ... cyclerview