我的ListView行中显示了错误的图像 [英] Wrong image show up in my ListView rows

问题描述

我在getView中使用以下代码:

I use this code in my getView:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if (v == null) {

        LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.listrow, null);
    }
    Order o = items.get(position);

    if (o != null) {
        TextView tt = (TextView) v.findViewById(R.id.toptext);
        ImageView thumb = (ImageView) v.findViewById(R.id.icon);

        if (o.getOrderDrawable() != null) {
            thumb.setImageDrawable(o.getOrderDrawable());
        } else {
            tt.setText(o.getOrderTitle());
        }

    }
    return v;
}

问题出在滚动时；有时显示正确的图像，但是有时在向后/向前滚动时，图像随机显示，并且与该行无关.

The problem is when scrolling; sometimes the correct image shows, but sometimes when scrolling back/forward, the images shows randomly and that is not associated with the row.

图像是从网上下载的.

我应该如何解决这个问题?

How should I solve this problem?

推荐答案

Android的ListView在不再需要列表项时会重用它们.因此，您需要确保所有应该更改的视图都将被更改.

Android's ListView reuses list items when they aren't need anymore. For this reason, you need to make sure all views that should change, will actually get changed.

您的问题是，如果找不到当前列表项的可绘制对象，则不会清空也不隐藏ImageView.在这种情况下，您应该执行thumb.setImageDrawable(null)或thumb.setVisibility(View.GONE).

Your problem is that if you don't find a drawable for the current list item, you don't empty nor hide the ImageView. You should do thumb.setImageDrawable(null) in that case, or thumb.setVisibility(View.GONE).

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