如何保存复选框的状态，而在ListView中滚动？ [英] How to save state of CheckBox while scrolling in ListView?

问题描述

我用的ListView自定义适配器，所以我的ListView包括复选框，但问题是，当我向下滚动，选中的复选框取消选中，我如何与这个code呢？

更新

我的自定义适配器：

 公共类AppsArrayAdapter扩展ArrayAdapter＆LT;串GT; {
    私人最终上下文的背景下;    私人列表＆LT;整数GT; checkedItems;    私人最终字符串DefaultApps =def_apps;    公共AppsArrayAdapter（上下文的背景下，的String []值列表与LT;整数GT; checkedItems）{// XXX
        超（背景下，R.layout.apps，价值观）;
        this.context =背景;
        this.checkedItems = checkedItems; // XXX
    }    @覆盖
    公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
        共享preferences我的prefsApps = context.getShared preferences（我的prefsApps，Context.MODE_PRIVATE）;
        字符串prefNameDefaultApps =我的prefsApps.getString（DefaultApps，）;
        字符串prefNameDefaultAppsVer =我的prefsApps.getString（DefaultAppsVer，）;
        LayoutInflater吹气=（LayoutInflater）上下文
                .getSystemService（Context.LAYOUT_INFLATER_SERVICE）;        查看rowView = inflater.inflate（R.layout.apps，父母，假）;
        TextView的text_apps =（TextView中）rowView.findViewById（R.id.text_apps）;
        复选框检查=（复选框）rowView.findViewById（R.id.check_apps）;
        text_apps.setText（prefNameDefaultApps.split（\\ n）[位置]）;        check.setChecked（checkedItems.contains（（整数）位置））;
        返回rowView;
    }
}
 

和我的活动：

 公共类AppsActivity扩展ListActivity {
    私人最终字符串DefaultApps =def_apps;    私人列表＆LT;整数GT; checkedItems =新的ArrayList＆LT;整数GT;（）;
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;        AppsArrayAdapter适配器=新AppsArrayAdapter（这一点，prefNameDefaultApps.split（\\ n），checkedItems）;
        setListAdapter（适配器）;
}
}
@覆盖
    公共无效onListItemClick（ListView中升，视图V，INT位置，长的id）{
       如果（checkedItems.contains（（整数）位置））checkedItems.remove（（整数）位置）;
       其他checkedItems.add（（整数）位置）;
    }
 

解决方案

你应该使用
MyAdapter newad =（MyAdapter）adapter.getAdapter（）;
        newad.notifyDataSetChanged（）;
这code在onitem点击方法
和MyAdapter是类适配器，使新对象像这样的
在适配器类，你应该有写一行

在LayoutInflater;
在=（LayoutInflater）c.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
适配器构造简单

I have used ListView with custom adapter, so my ListView includes CheckBox, but problem is that when I scroll down, checked CheckBoxes uncheck, how can I do it with this code?

UPDATE

My custom adapter:

    public class AppsArrayAdapter extends ArrayAdapter<String> {
    private final Context context;

    private List<Integer> checkedItems;

    private final String DefaultApps = "def_apps";

    public AppsArrayAdapter(Context context, String[] values, List<Integer> checkedItems) {//XXX
        super(context, R.layout.apps, values);
        this.context = context;
        this.checkedItems = checkedItems;//XXX
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        SharedPreferences myPrefsApps =context.getSharedPreferences("myPrefsApps", Context.MODE_PRIVATE);
        String prefNameDefaultApps = myPrefsApps.getString(DefaultApps, "");
        String prefNameDefaultAppsVer = myPrefsApps.getString(DefaultAppsVer, "");


        LayoutInflater inflater = (LayoutInflater)context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View rowView = inflater.inflate(R.layout.apps, parent, false);
        TextView text_apps = (TextView)rowView.findViewById(R.id.text_apps);
        CheckBox check = (CheckBox)rowView.findViewById(R.id.check_apps);
        text_apps.setText(prefNameDefaultApps.split("\n")[position]);

        check.setChecked(checkedItems.contains((Integer) position));
        return rowView;
    }   
}

And my Activity:

    public class AppsActivity extends ListActivity {
    private final String DefaultApps = "def_apps";

    private List<Integer> checkedItems = new ArrayList<Integer>();


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        AppsArrayAdapter adapter = new AppsArrayAdapter(this, prefNameDefaultApps.split("\n"), checkedItems);
        setListAdapter(adapter);
}
}
@Override
    public void onListItemClick(ListView l, View v, int position, long id) {
       if(checkedItems.contains((Integer) position)) checkedItems.remove((Integer) position);
       else checkedItems.add((Integer) position);
    }

解决方案

you should use MyAdapter newad=(MyAdapter)adapter.getAdapter(); newad.notifyDataSetChanged(); this code in onitem click method and MyAdapter is class of Adapter and make new object like this one and in adapter class you should have to write a line

LayoutInflater in; in=(LayoutInflater)c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); in adapter constructor simple

这篇关于如何保存复选框的状态，而在ListView中滚动？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！