安卓：单选按钮不断改变其状态时，列表视图滚动 [英] Android : Radio Buttons keep changing their state when List View Scrolled

问题描述

我有一个列表项三个单选按钮列表视图，问题是，当我滚动列表视图，选定的单选按钮的位置得到改变。所以，请让我知道如何保持单选按钮的选择不变，即使我滚动列表视图。我的code是，

RadioGroupAdapter.java

 公共RadioGroupAdapter（上下文的背景下，INT layoutResourceId，
            选项​​[]数据）{
        超级（上下文，layoutResourceId，数据）;
        this.layoutResourceId = layoutResourceId;
        this.context =背景;
        this.data =数据;
    }    @覆盖
    公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
        查看排= convertView;
        MatrixHolder支架=无效;        如果（行== NULL）{
            LayoutInflater充气=（（活动）上下文）.getLayoutInflater（）;
            行= inflater.inflate（layoutResourceId，父母，假）;            持有人=新MatrixHolder（）;
            holder.txtTitle =（TextView中）row.findViewById（R.id.heading）;
            holder.group =（RadioGroup中）row.findViewById（R.id.radio_group1）;
            最后的单选按钮[] = RB新单选[2];
            对（INT I = 0; I＆2;我++）{                RB [I] =新的单选按钮（背景）;
               // RB [I] .setButtonDrawable（R.drawable.single_radio_chice）;
                RB [I] .setId（ⅰ）;
                RadioGroup.LayoutParams PARAMS =新RadioGroup.LayoutParams（
                        0，LayoutParams.WRAP_CONTENT）;
                params.weight = 1.0F;
                params.setMargins（5,0，5，10）;
                holder.group.addView（RB [I]，则params）; //的单选按钮被添加到radioGroup中代替的布局
            }
           //（（Matr​​ixHolder）持有者）.group.clearCheck（）;
            row.setTag（保持器）;
        }其他{
            支架=（Matr​​ixHolder）row.getTag（）;
        }        选项​​option =数据[位置]
        holder.txtTitle.setText（option.title）;
        返回行;
    }
 

解决方案

通过添加两种不同功能的解决我的问题：
我知道它几乎是一个黑客，但它的工作原理。所以永远不要介意;）

  @覆盖
    公众诠释getViewTypeCount（）{
                  //计数= ArrayList的大小。
        返回data.length;
    }    @覆盖
    公众诠释getItemViewType（INT位置）{        返回的位置;
    }
 

I have a listview with three Radio Buttons in a list item, Issue is that when I scroll list view, the radio buttons selected position gets changed. So please let me know how to keep radio button's selection intact even if I scroll list view. My code is,

RadioGroupAdapter.java

public RadioGroupAdapter(Context context, int layoutResourceId,
            Option[] data) {
        super(context, layoutResourceId, data);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        MatrixHolder holder = null;



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

            holder = new MatrixHolder();
            holder.txtTitle = (TextView) row.findViewById(R.id.heading);
            holder.group = (RadioGroup) row.findViewById(R.id.radio_group1);
            final RadioButton[] rb = new RadioButton[2];
            for(int i=0; i<2; i++){

                rb[i]  = new RadioButton(context);
               // rb[i].setButtonDrawable(R.drawable.single_radio_chice);
                rb[i].setId(i);
                RadioGroup.LayoutParams params = new RadioGroup.LayoutParams(
                        0, LayoutParams.WRAP_CONTENT);
                params.weight=1.0f;
                params.setMargins(5, 0, 5, 10);
                holder.group.addView(rb[i],params); //the RadioButtons are added to the radioGroup instead of the layout
            }


           // ((MatrixHolder)holder).group.clearCheck();


            row.setTag(holder);
        } else {
            holder = (MatrixHolder) row.getTag();
        }

        Option option = data[position];
        holder.txtTitle.setText(option.title);
        return row;
    }

解决方案

Solved my problem by adding two different functions: I know its almost a hack but it works. So never mind ;)

@Override
    public int getViewTypeCount() {                 
                  //Count=Size of ArrayList.
        return data.length;
    }

    @Override
    public int getItemViewType(int position) {

        return position;
    }

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