Question

我正在使用RecyclerView来显示商品列表。我有两个TextViews一个低于另一个。最初，第二个TextView设置为singleline = true。现在点击项目时，我正在设置singleline = false。这只是为了在点击时展开它（如ExpandableList）。代码工作正常但问题是，当RecyclerView使用回收项时，其他项TextView值也被设置为singleline = false。现在我该如何避免这种情况？

代码

public class InboxAdapter extends RecyclerView.Adapter<InboxAdapter.InboxViewHolder> {

    private Context context;
    private List<InboxModel> listInbox;
    private InboxModel currentItem;

    public InboxAdapter(Context context, List<InboxModel> listInbox) {
        this.context = context;
        this.listInbox = listInbox;
    }

    @Override
    public InboxViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.custom_inbox_item, parent, false);
        InboxViewHolder viewHolder = new InboxViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final InboxViewHolder holder, int position) {

        currentItem = listInbox.get(position);
        holder.tvHeader.setText(currentItem.header);
        holder.tvMsg.setText(currentItem.msg);

        holder.tvHeader.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                holder.tvMsg.setSingleLine(false);
                LinearLayout.LayoutParams lp= (LinearLayout.LayoutParams) holder.tvMsg.getLayoutParams();
                lp=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
                holder.tvMsg.setLayoutParams(lp);

            }
        });

    }

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

    class InboxViewHolder extends RecyclerView.ViewHolder {

        private TextView tvImageHeader;
        private TextView tvHeader;
        private TextView tvMsg;
        private TextView tvDate;


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

            tvImageHeader = (TextView) itemView.findViewById(R.id.tv_img_header);
            tvHeader = (TextView) itemView.findViewById(R.id.tv_header);
            tvMsg = (TextView) itemView.findViewById(R.id.tv_msg);
            tvDate = (TextView) itemView.findViewById(R.id.tv_date);
        }
    }

Answer 1

您必须在所有情况中设置属性，以避免回收项目出现问题。

    @Override
    public void onBindViewHolder(final InboxViewHolder holder, int position){

   //....

   if (currentItem.myBoolean){
      holder.tvMsg.setSingleLine(true);
   } else {
      holder.tvMsg.setSingleLine(false);
   }

   //...
}

在您的点击事件中，只需更改对象内的值（而不是视图！）。 Somenthing喜欢：

holder.tvHeader.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    currentItem.myBoolean = true;
                    //call the notify !  
                }
            });

如果此状态是独占的，则不使用项目内的变量，而是使用适配器内的变量（InboxModel checkedItem）。

Answer 2

嗯，为此你必须在onBindViewHolder（）中保存点击位置和写条件，如下所示

@Override
        public void onBindViewHolder(final InboxViewHolder holder, int position) {
    if(Postion==Mysavedposition){
      holder.tvMsg.setSingleLine(false);
    }else{
      holder.tvMsg.setSingleLine(true);
    }
            currentItem = listInbox.get(position);
            holder.tvHeader.setText(currentItem.header);
            holder.tvMsg.setText(currentItem.msg);

            holder.tvHeader.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
    Mysavedposition=position;
                    holder.tvMsg.setSingleLine(false);
                    LinearLayout.LayoutParams lp= (LinearLayout.LayoutParams) holder.tvMsg.getLayoutParams();
                    lp=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
                    holder.tvMsg.setLayoutParams(lp);

                }
            });

        }

滚动RecyclerView也会更改其他数据

2 个答案: