回收站视图在滚动时弄乱了数据

Question

向下和向上滚动后滚动回收器视图时遇到问题。这个想法是改变元素的颜色，但是当我向下滚动时，一切都很好，当滚动向上时——不应该着色的元素正在改变颜色。

这是我的适配器：

public class NotificationsAdapter extends RecyclerView.Adapter<NotificationsAdapter.ViewHolder> {

private NotificationData notificationData;
private Context mContext;
private ArrayList<NotificationData> infromationList = new ArrayList<>();


public NotificationsAdapter(Context context, ArrayList<NotificationData> infromationList) {
    this.infromationList = infromationList;
    this.mContext = context;
}


@Override
public NotificationsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View itemLayoutView;
    ViewHolder viewHolder;

    itemLayoutView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.notification_single_item, parent, false);
    viewHolder = new ViewHolder(itemLayoutView, viewType);

    return viewHolder;
}

@Override
public void onBindViewHolder(NotificationsAdapter.ViewHolder holder, int position) {

    notificationData = infromationList.get(position);
    holder.notificationDate.setText(convertDate(notificationData.getDate()));
    holder.notificationStatus.setText(notificationData.getNotificationStatus());
    holder.orderDescription.setText(notificationData.getNotificationLabel());

    if ("true".equals(notificationData.getReadStatus())) {
        holder.root.setBackgroundColor(mContext.getResources().getColor(R.color.white));
        holder.notificationStatus.setTypeface(Typeface.create("sans-serif-light", Typeface.NORMAL));
    }

}

@Override
public int getItemCount() {
    return (null != infromationList ? infromationList.size() : 0);
}

public static class ViewHolder extends RecyclerView.ViewHolder {

    public TextView notificationDate;
    public TextView notificationStatus;
    public TextView orderDescription;
    public LinearLayout root;

    public ViewHolder(View itemView, int position) {
        super(itemView);

        notificationDate = (TextView) itemView.findViewById(R.id.notificationDate);
        notificationStatus = (TextView) itemView.findViewById(R.id.notificationStatus);
        orderDescription = (TextView) itemView.findViewById(R.id.orderDescription);
        root = (LinearLayout) itemView.findViewById(R.id.root);
    }

}

private String convertDate(String date) {
    String convertedDate;

    String[] parts = new String[2];
    parts = date.split("T");
    date = parts[0];

    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
    Date testDate = null;
    try {
        testDate = sdf.parse(date);
    }catch(Exception ex){
        ex.printStackTrace();
    }
    SimpleDateFormat formatter = new SimpleDateFormat("dd.mm.yyyy");
    convertedDate = formatter.format(testDate);

    return convertedDate;
}
}

Answer 1

您的onBindViewHolder（…）中存在问题，应该是：

if ("true".equals(notificationData.getReadStatus())) {
    holder.root.setBackgroundColor(mContext.getResources().getColor(R.color.white));
    holder.notificationStatus.setTypeface(Typeface.create("sans-serif-light", Typeface.NORMAL));
}
else {
    holder.root.setBackgroundColor(yourDefaultColor);
    holder.notificationStatus.setTypeface(yourDefaultTypeface);

}

Answer 2

添加＜code＞setHassTableId（true） 并在适配器中重写这两个方法。

@Override
public long getItemId(int position) {
            return position;
}

@Override
public int getItemViewType(int position) {
       return position;
}

Answer 3

我有同样的问题，我找到的唯一解决办法是：

holder.setIsRecyclable(false);

您的回收器将不再回收，因此当您滚动时，项目将是相同的，如果您想要删除某些项目，请不要使用< code > notifyitemRemoved(position)，而是使用< code > notifyDataSetChanged()。