ListView - getView被调用太多次了

Question

我知道关于'getView几次调用'这个问题的问题很少,但我的问题却没什么不同.

我有一个自定义listView与自定义行(使用row_layout.xml).它通常运作良好.一开始我遇到了多次调用getView的问题,并且使用我在stackoverflow中看到的方法之一修复了它.(使用'usedPositions'数组).

现在,我在日志中看到这个场景:getView pos 0,getView pos 1,getView pos 0,getView pos 1.这导致我的行加倍.只有当我调用覆盖当前活动的新活动然后关闭该活动时才会发生这种情况.(例如,打开相机活动,然后关闭它).

我将展示我的代码:

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;
}

你能告诉我什么是错的吗？

Answer 1

引用 android工程师RomainGuy

这不是问题,绝对不能保证调用getView()的顺序也不保证多少次.

因此,您可以处理的最好方法是正确地重用现有视图(行布局).

这是另一个好帖子.