Question

CountDownTimer在滚动时未显示

下面是我的代码；

public void onBindViewHolder(final RecyclerView.ViewHolder viewHolder, final int position) {
{

   if (holder.timer != null) {
        holder.timer.cancel();
    }



  if (!resturantDetails.getRemainingTime().equalsIgnoreCase("") && holder.timer == null) {

            Log.e("AAAAAAAAAAAAAAAAAAAAAAAAA", "" + resturantDetails.getRemainingTime());
            holder.timer = new CountDownTimer(Long.parseLong(resturantDetails.getRemainingTime()), 1000) {
                @Override
                public void onTick(long millisUntilFinished) {

                    long seconds = (millisUntilFinished / 1000) % 60;
                    long minutes = ((millisUntilFinished / (1000 * 60)) % 60);
                    long hours = ((millisUntilFinished / (1000 * 60 * 60)) % 24);

                    holder.tvHour.setText(String.format("%02d", hours));
                    holder.tvMinutes.setText(String.format("%02d", minutes));
                    holder.tvSeconds.setText(String.format("%02d", seconds));
                }

                @Override

                public void onFinish() {

                }
            }.start();
        } 
}

下面是我的ViewHolder班；

  public class ResturantDashboardViewHolder extends RecyclerView.ViewHolder {


        CountDownTimer timer;

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

        }
    }

Answer 1

这个问题很简单。

RecyclerView重用持有者，每次调用bind来更新其中的数据。

由于每次绑定任何数据都会创建一个CountDownTimer，所以最终会有多个计时器更新同一ViewHolder。

最好的办法是cancel，然后绑定数据（如果已启动）并重新安排到所需的持续时间。

public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
    ...
    if (holder.timer != null) {
        holder.timer.cancel();
    }
    holder.timer = new CountDownTimer(expiryTime, 500) {
        ...
    }.start();
}

public static class ResturantDashboardViewHolder extends RecyclerView.ViewHolder {
    ...
    CountDownTimer timer;

    public FeedViewHolder(View itemView) {
        ...
    }
}

这样，您将在启动另一个计时器之前取消该ViewHolder的任何当前计时器实例。

Answer 2

最后我得到了最好的解决方案；

下面是倒计时计时器的适配器代码

    public class RestaurantListDetailAdapter extends RecyclerView.Adapter<RestaurantListDetailAdapter.ResturantDashboardViewHolder> implements Filterable {

    ArrayList<RestaurantListDetail.DataModel.ResultList> resturantList = new ArrayList<>();
    Context mContext;
    Utils utils;
    String latitude, longitude;
    OffersAdapter offersAdapter;
    private ArrayList<RestaurantListDetail.DataModel.ResultList> mFilteredList;

    public RestaurantListDetailAdapter(ArrayList res, Context mContext, String latitude, String longitude) {
        this.resturantList = res;
        this.mContext = mContext;
        this.latitude = latitude;
        this.longitude = longitude;

        long maxTime = 0;
        for (RestaurantListDetail.DataModel.ResultList item : resturantList) {
            if (!item.getRemainingTime().equalsIgnoreCase("")) {
                maxTime = Long.parseLong(item.getRemainingTime());
            }
        }

        new CountDownTimer(maxTime, 1000) {
            @Override
            public void onTick(long l) {

                for (int i = 0, dataLength = resturantList.size(); i < dataLength; i++) {
                    RestaurantListDetail.DataModel.ResultList item = resturantList.get(i);
                    if (!item.getRemainingTime().equalsIgnoreCase("")) {
                        item.setRemainingTime(String.valueOf(Long.parseLong(item.getRemainingTime())-1000)) ;
                    }
                }

                //remove the expired items
                //Iterator<RestaurantListDetail.DataModel.ResultList> dataIterator = resturantList.iterator();
                //while (dataIterator.hasNext()) {
                //RestaurantListDetail.DataModel.ResultList rd = dataIterator.next();
                //if (rd.getRemainingTime().equalsIgnoreCase("")) {
                //          dataIterator.remove();
                //                        }
                //                    }
                notifyDataSetChanged();
            }

            @Override
            public void onFinish() {
            // resturantList.clear();
            // notifyDataSetChanged();
            }
        }.start();

    }

    @Override
    public ResturantDashboardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.dashboard_search_item, parent, false);
        ResturantDashboardViewHolder viewHolder = new ResturantDashboardViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ResturantDashboardViewHolder holder, final int position) {
        final RestaurantListDetail.DataModel.ResultList resturantDetails = resturantList.get(position);

        if (!resturantDetails.getRemainingTime().equalsIgnoreCase(""))
        {
            long seconds = Long.parseLong(resturantDetails.getRemainingTime()) / 1000;
            long minutes = seconds / 60;

            holder.tvHour   .setText(String.format("%02d", TimeUnit.MILLISECONDS.toHours(Long.parseLong(resturantDetails.getRemainingTime()))));
            holder.tvMinutes.setText(String.format("%02d",minutes % 60));
            holder.tvSeconds.setText(String.format("%02d",seconds % 60));
        }

    }

    @Override
    public int getItemCount() {
        return resturantList.size();
    }


    public class ResturantDashboardViewHolder extends RecyclerView.ViewHolder {


        LinearLayout llBookingTable, ll_timer_slot, llOfferLayout, llOffers, rl_offer;
        TextView tv_resturantname, tvSeatLeft, tvListsTags, tvOffers, textView, tvHour, tvMinutes, tvSeconds, tvOutlets, tv_distance, tv_place, tv_rating, tvClosed, tvCostForTwo, tvOffer, tvSuburb;


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

            tvOffers = itemView.findViewById(R.id.tvOffers);
            rl_offer = itemView.findViewById(R.id.rl_offer);
            tvSeatLeft = itemView.findViewById(R.id.tvSeatLeft);
            tvListsTags = itemView.findViewById(R.id.tvListsTags);
            textView = itemView.findViewById(R.id.textView);
            llOfferLayout = itemView.findViewById(R.id.llOfferLayout);

            llBookingTable = itemView.findViewById(R.id.llBookingTable);
            ll_timer_slot = itemView.findViewById(R.id.ll_timer_slot);
            tvHour = itemView.findViewById(R.id.tvHour);
            tvMinutes = itemView.findViewById(R.id.tvMinutes);
            tvSeconds = itemView.findViewById(R.id.tvSeconds);
            tvOutlets = itemView.findViewById(R.id.tvOutlets);
            llOffers = itemView.findViewById(R.id.llOffers);
            tvSuburb = itemView.findViewById(R.id.tvSuburb);
            tv_distance = itemView.findViewById(R.id.tv_distance);
            tv_place = itemView.findViewById(R.id.tv_resturant_place);
            tv_resturantname = itemView.findViewById(R.id.tv_resturant_item);
            tv_rating = itemView.findViewById(R.id.tv_rating);
            tvClosed = itemView.findViewById(R.id.tvClosed);
            tvCostForTwo = itemView.findViewById(R.id.tvCostForTwo);
            tvOffer = itemView.findViewById(R.id.tvOffer);
        }
    }

}

倒数计时器在滚动时无法正常工作？

2 个答案: