ListView控件 - getView被称为太多时间

问题描述

我知道有关于这个问题的几个问题getView叫几次，但我的问题是有点不同。

I know there are few questions regarding this issue of 'getView called few times' but my problem is little different.

我有一个自定义的ListView自定义行（使用row_layout.xml）。它通常效果很好。在开始的时候，我曾与多个呼叫的问题getView并将其固定用的，我看到这里的计算器的方法之一。 （使用usedPositions'数组）。

I have a custom listView with custom row ( used a row_layout.xml).It generally works well. At the beginning I had a problem with multiple calls to getView and it was fixed by using one of the methods I saw here in stackoverflow. ( using the 'usedPositions' array).

现在，我在日志中看到这样的场景：getView POS 0，getView POS 1，getView POS 0，getView POS 1。这使我行增加一倍。它只是发生在我打电话，涵盖了当前活动，然后关闭该活动的新活动。 （例如，打开摄像头活动，然后将其关闭）。

now, I see in the logs this scenario: getView pos 0, getView pos 1, getView pos 0 , getView pos 1.This caused my rows to be doubled. It happens only when I call a new activity that covers the current activity and then close that activity. ( for example, open the camera activity and then close it).

我会告诉我的code：

I will show my code:

public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View row = convertView;
    Toast toast = Toast.makeText(this.context, "getView " + position, 1000);
    toast.show();
    String pos = Integer.toString(position);
    if (!usedPositions.contains(pos)) {

        CardHolder holder = null;

        if(row == null)
        {
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new CardHolder();
            //holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
            holder.txtCouponTitle = (TextView)row.findViewById(R.id.txtTitle);
            holder.txtBusinessName = (TextView)row.findViewById(R.id.txtBusinessName);
            row.setTag(holder);
        }
        else
        {
            holder = (CardHolder)row.getTag();
        }

        Card card = data.get(position);
        holder.txtCouponTitle.setText(card.couponTitle);
        holder.txtBusinessName.setText(card.businessName);
        //holder.imgIcon.setImageResource(card.icon);

        TableLayout table = (TableLayout)row.findViewById(R.id.imagesTable);
        for (int r=1; r<=1; r++){
            TableRow tr = new TableRow(this.context);
            for (int c=1; c<=10; c++){
                ImageView im = new ImageView (this.context);
                im.setImageDrawable(this.context.getResources().getDrawable(c<= card.numberOfStamps ? R.drawable.stamp_red :R.drawable.stamp_grey));
                im.setPadding(6, 0, 0, 0); //padding in each image if needed
                //add here on click event etc for each image...
                //...
                tr.addView(im, 40,40);
            }
            table.addView(tr);
        }

        // Your code to fill the imageView object content
        usedPositions.add(pos); // holds the used position
    }
    else
        usedPositions.remove(pos);

    return row;
}

你能告诉我有什么不对？

Can you tell me what's wrong?

推荐答案

报价的Andr​​oid工程师的

Quoting android engineer RomainGuy

这是不是一个问题，是绝对没有保证的顺序  这getView（）将被调用也不会有多少次。

所以最好你能处理的重新使用现有的意见（行布局）正确。

So the best you can handle is re-using the existing views (row layouts) properly.

这里是另一个的好帖子。

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