下面的列表复选框被选中，如果我检查列表视图顶部的复选框 [英] Checkbox below the list are checked, if i check any checkboxes on top of the listview

问题描述

什么是破天:: 的
列表视图我能够选中该复选框，当我滚动复选框在列表中向下下面的列表元素被检查

我怎样才能解决这个！的

---

{UPDATED code}

AdptSearchFilterCategories.java

 公共类AdptSearchFilterCategories延伸ArrayAdapter＆LT; ModelFilterCategories＆GT; {    私人上下文的背景下;
    清单＆LT; ModelFilterCategories＆GT; mdlLst;
    公共AdptSearchFilterCategories（Activity上下文，列表＆LT; ModelFilterCategories＆GT; mdlLst）{
        超（背景下，R.layout.adpt_searchfilter_category，mdlLst）;
        this.context =背景;
        this.mdlLst = mdlLst;
    }
    静态类ViewHolder {
        保护复选框chkBxCatId;
    }    @覆盖
    公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
        ViewHolder viewHolder = NULL;
        如果（convertView == NULL）{
            LayoutInflater mInflater =（LayoutInflater）context.getSystemService（Activity.LAYOUT_INFLATER_SERVICE）;
            convertView = mInflater.inflate（R.layout.adpt_searchfilter_category，NULL）;            viewHolder =新ViewHolder（）;
            viewHolder.chkBxCatId =（复选框）convertView.findViewById（R.id.chkBxCatId）;
            viewHolder.chkBxCatId.setOnCheckedChangeListener（新CompoundButton.OnCheckedChangeListener（）{
                        @覆盖
                        公共无效onCheckedChanged（CompoundButton buttonView，布尔器isChecked）{
                            INT为getPosition =（整数）buttonView.getTag（）; //这里我们得到我们为使用setTag复选框的位置。
                            mdlLst.get（为getPosition）.setCheckboxState（buttonView.isChecked（））; //设置复选框的值，以保持其状态。
                        }
                    }）;
            convertView.setTag（viewHolder）;
        }其他{
            viewHolder =（ViewHolder）convertView.getTag（）;
        }        viewHolder.chkBxCatId.setTag（位置）; //这一行是很重要的。
        viewHolder.chkBxCatId.setText（mdlLst.get（位置）.getCategoryName（））;        返回convertView;
    }}
 

解决方案

复选框的复制到其他国家的观点，因为该适配器重用convertview。

1. 我建议增加一个器isChecked 变量的模式对象。



2. 在获取视图的方法，你应该使用这样的：

     viewHolder.checkbox.setChecked（list.get（位置）.isChecked）;
    




3. 不要使用 setOnCheckedChangeListener ，因为这个：

     viewHolder.checkbox.setChecked（list.get（位置）.isChecked）;
    

   将调用方法onCheckedChanged。



4. 实现OnClickListener上 viewHolder.checkbox ，当你得到的单击事件只是切换的布尔状态（使用 Model.isChecked =！模型。器isChecked ），然后 notifyDataSetChanged 。

What is Happening:: Listview i am able to check the checkbox, when i scroll the list elements below the checkboxes down the list are are checked

How can i resolve this !

---

{UPDATED CODE}

AdptSearchFilterCategories.java

 public class AdptSearchFilterCategories extends ArrayAdapter<ModelFilterCategories> {

    private Context context;
    List<ModelFilterCategories> mdlLst;


    public AdptSearchFilterCategories(Activity context, List<ModelFilterCategories> mdlLst) {
        super(context, R.layout.adpt_searchfilter_category, mdlLst);
        this.context = context;
        this.mdlLst = mdlLst;
    }


    static class ViewHolder {
        protected CheckBox chkBxCatId;
    }

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


        ViewHolder viewHolder = null;
        if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.adpt_searchfilter_category, null);

            viewHolder = new ViewHolder();
            viewHolder.chkBxCatId = (CheckBox) convertView.findViewById(R.id.chkBxCatId);
            viewHolder.chkBxCatId.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                        @Override
                        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                            int getPosition = (Integer) buttonView.getTag();  // Here we get the position that we have set for the checkbox using setTag.
                            mdlLst.get(getPosition).setCheckboxState(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
                        }
                    });
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.chkBxCatId.setTag(position); // This line is important.
        viewHolder.chkBxCatId.setText(mdlLst.get(position).getCategoryName());

        return convertView;
    }

}

解决方案

The state of the check box copied to others view because the adapter is reusing the convertview.

1. I suggest adding an isChecked variable to the Model object.

2. In the "get view" method, you should use this:

   viewHolder.checkbox.setChecked(list.get(position).isChecked);
   

3. Don't use setOnCheckedChangeListener, because this:

   viewHolder.checkbox.setChecked(list.get(position).isChecked);
   

   will invoke the method onCheckedChanged.

4. Implement OnClickListener on viewHolder.checkbox, and when you get the click event just switch the boolean state (using Model.isChecked = !Model.isChecked) and then notifyDataSetChanged.

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