Multiple count down timers in RecyclerView flickering when scrolled

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This problem is simple.

RecyclerView reuses the holders, calling bind each time to update the data in them.

Since you create a CountDownTimer each time any data is bound, you will end up with multiple timers updating the same ViewHolder.

The best thing here would be to move the CountDownTimer in the FeedViewHolder as a reference, cancel it before binding the data (if started) and rescheduling to the desired duration.

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

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

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

This way you will cancel any current timer instance for that ViewHolder prior to starting another timer.

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