Question

Index，Gainers，Losers是3 buttons。在每次button点击时，listView会填充相应的数据。

第3列%Chg可以否定或正面。

根据%Chg值的值，相应的arrow应显示在imageView列%Chg之后，{<1}}列值向上箭头 < em>正值和向下箭头 负值 ...

在任何button点击中，我将%Chg列中的updown列的值传递给Adapter类

根据该值，Adapter应设置 down arrow 或 up arrow

Adapter类的代码片段（getView（）方法）

public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        LayoutInflater inflater = activity.getLayoutInflater();

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.list_table, null);
            holder = new ViewHolder();

            holder.txtFirst = (TextView) convertView
                    .findViewById(R.id.FirstText);
            holder.txtSecond = (TextView) convertView
                    .findViewById(R.id.SecondText);
            holder.txtThird = (TextView) convertView
                    .findViewById(R.id.ThirdText);
            holder.ivarrow = (ImageView) convertView.findViewById(R.id.ivarrow);
            holder.l1 = (LinearLayout) convertView
                    .findViewById(R.id.tableLayout);

            convertView.setTag(holder);

        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        HashMap<String, String> map = list.get(position);
//Setting the row background
        if (count % 2 == 0) {
            try {
                InputStream is1 = ctx.getAssets().open("cellbg.png");
                Drawable d1 = Drawable.createFromStream(is1, "cellbg");
                holder.l1.setBackgroundDrawable(d1);

            } catch (Exception e) {
                throw new Error(" exception in TableListAdapter "
                        + e.getMessage());
            }
        } else {
            try {
                InputStream is2 = ctx.getAssets().open("cellbg1.png");
                Drawable d2 = Drawable.createFromStream(is2, "cellbg1");
                holder.l1.setBackgroundDrawable(d2);
            } catch (Exception e) {
                throw new Error(" exception in TableListAdapter "
                        + e.getMessage());
            }
        }
        count++;
//setting the arrow
        if (i < updown.length) {
            if (updown[i] > 0) {
                holder.ivarrow.setImageResource(R.drawable.up);
                Log.v("up", "up");
            } else {
                holder.ivarrow.setImageResource(R.drawable.down);
                Log.v("down", "down");
            }
            Log.v("i=", i + " ,updown=" + updown[i]);
            i++;
        }

        holder.txtFirst.setText(map.get(FIRST_COLUMN));
        holder.txtSecond.setText(map.get(SECOND_COLUMN));
        holder.txtThird.setText(map.get(THIRD_COLUMN));
        return convertView;
    }

日志显示正确的数据，但箭头仅显示在第一行。即，如果列表的最后一个值为positive，则会向第一行显示up arrow，如果列表的最后一个值为negative，则会向第一行显示down arrow ... < / p>

如何向每行显示相应的箭头？

我是Android开发的新手。所以任何帮助都将是生命的救星!!!

screen

Answer 1

if (i < updown.length) {
        if (updown[i] > 0) 
            holder.ivarrow.setImageResource(R.drawable.up);
        else 
            holder.ivarrow.setImageResource(R.drawable.down);
        Log.v("i=", i + " ,updown=" + updown[i]);
        i++;
    }

用以下代码替换您的代码：

if (updown[position] > 0) 
            holder.ivarrow.setImageResource(R.drawable.up);
        else 
            holder.ivarrow.setImageResource(R.drawable.down);

我觉得它适合你

基于getView（）方法中的数据设置图像

1 个答案: