文本值在自定义列表视图时滚动的android列表视图改变？ [英] Text values are changed in customized listview when scroll the listview in android?

问题描述

在我的应用程序正在使用自定义列表视图与文本视图，编辑文本和buttons.When我点击按钮，在0号位置，是改变0，文中观点值个位置。当我滚动向下在列表视图中的值0个位置文本视图改变为初始状态什么都。

In my application am using customized list-view with text view,edit-text and buttons.When i click the button in "0"Th position and am change the text view values in "0"Th position .when i scroll down the list-view the values in "0"Th position text view changed to what ever in initial state.

我的基本适配器类

public class sample extends BaseAdapter{

public ArrayList<HashMap<String, String>> list;
Activity activity;

public sample(Activity activity,ArrayList<HashMap<String, String>> list) {
    super();
    this.activity = activity;
    this.list = list;
}

public int getCount() {
    // TODO Auto-generated method stub
    return list.size();
}

public Object getItem(int position) {
    // TODO Auto-generated method stub
    return list.get(position);
}

public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

class ViewHolder {

    Button order;
    TextView item_name, order_qty;
    EditText et_quantity;

}

public View getView(final int position, View convertView,final ViewGroup parent) {
    // TODO Auto-generated method stub



    final ViewHolder holder;
    LayoutInflater inflater = activity.getLayoutInflater();

    if (convertView == null) {

        convertView = inflater.inflate(R.layout.order_custom, null);

        holder = new ViewHolder();

        holder.order = (Button) convertView.findViewById(R.id.order);
        holder.item_name = (TextView) convertView.findViewById(R.id.item_name);
        holder.order_qty = (TextView) convertView.findViewById(R.id.order_count);

        convertView.setTag(holder);

    } else {
        holder = (ViewHolder) convertView.getTag();
    }
try{
    HashMap<String, String> map = list.get(position);

    holder.item_name.setText(map.get("name"));

    //Log.v("Available or not", ""+map.get("available"));


}catch(Exception e){
    e.printStackTrace();
}


holder.order.setOnClickListener(new View.OnClickListener() {

    public void onClick(View arg0) {
        // TODO Auto-generated method stub

        //here am click the button to change order count text value
        int qty = Integer.valueOf(""+holder.order_qty.getText().toString());

        qty++;

        holder.order_qty.setText(""+String.valueOf(qty));
 }
});


return convertView;
}

}

我不知道为什么文本值更改为初始状态，向下滚动自定义列表view.Can任何人知道，请帮我解决这个问题。

i don't know why the text values changed to initial state when scroll down the customized list view.Can any one know please help me to solve this issue

推荐答案

现在的问题是，你不使用的每一行有不同的看法持有人，并回收您的列表项时，浏览您的持有人togheter洗牌。

The problem is that you are not using a different view holder for every line, and that when recycling your list item views your holders are shuffled togheter.

您可以看到这只是添加最终诠释位置字段到你的持有人，在哪里存储getView位置参数;调试时，你会看到什么情况发生。

You can see this simply adding a final int position field to your holder, where to store the getView position parameter; debugging, you will see what happen.

因此​​，你不能用持有人来存储量值

此外，不使用变量列表来店量的值。这code为我工作：

Furthermore, you are not using the variable list to store quantity values. This code is working for me:

    public View getView(final int position, View convertView,final ViewGroup parent) {

    final ViewHolder holder;
    LayoutInflater inflater = activity.getLayoutInflater();

    if (convertView == null) {

        convertView = inflater.inflate(R.layout.order_custom, null);

        holder = new ViewHolder();

        holder.order = (Button) convertView.findViewById(R.id.order);
        holder.item_name = (TextView) convertView.findViewById(R.id.item_name);
        holder.order_qty = (TextView) convertView.findViewById(R.id.order_count);

        convertView.setTag(holder);

    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    try{
        HashMap<String, String> map = list.get(position);

        holder.item_name.setText(map.get("name"));
        holder.order_qty.setText(map.get("quantity"));

        //Log.v("Available or not", ""+map.get("available"));


    }catch(Exception e){
        e.printStackTrace();
    }


    holder.order.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {
            // TODO Auto-generated method stub

            //here am click the button to change order count text value
            int qty = Integer.valueOf(list.get(position).get("quantity"));

            qty++;

            holder.order_qty.setText(""+String.valueOf(qty));
            list.get(position).put("quantity", qty+"");
        }
    });


    return convertView;
}

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