Checkedtextview 在滚动 Listview 后选中/取消选中 [英] Checkedtextview check/uncheck after scroll Listview

问题描述

我正在使用viewHolder 和getview 在listvew 中开发checkedtextview.从数据库填充选中/取消选中状态绑定运行良好.但是，如果我检查项目然后滚动列表视图，它将返回取消选中.

I'm developing checkedtextview in listvew using viewHolder and getview. To populate check/uncheck status binding from database is running well. But, if I check item and then scroll listview, it will back to uncheck.

这是我的 customAdapter 代码.

here is my customAdapter code.

public class CustomAdapter extends ArrayAdapter<Model> {
private Activity activity;
int id;
String autoid;
ArrayList<Model> items;
DatabaseHelper dbhelper = new DatabaseHelper(getContext());

public CustomAdapter(Activity context, int resource, ArrayList<Model> obj) {
    super(context, resource, obj);

    this.activity = context;
    this.id = resource;
    this.items = obj;

    try {
        dbhelper.openDatabase();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}



static class ViewHolder {
    protected CheckedTextView textView;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder vh = null;

    if (convertView == null) {

        LayoutInflater inflater = activity.getLayoutInflater();
        convertView = inflater.inflate(id, null);
        vh = new ViewHolder();
        convertView.setTag(vh);

        vh.textView = (CheckedTextView) convertView.findViewById(R.id.textbox1);

    }
    else
    {
        vh = (ViewHolder) convertView.getTag();

    }

    final Model item = items.get(position);
    String status = item.getStatus();

    final Model check = getItem(position);

    final ViewHolder finalVh = vh;

    vh.textView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            autoid = item.getAutoid();

            if (! finalVh.textView.isChecked()) {
                finalVh.textView.setChecked(true);
            }
            else
            {
                finalVh.textView.setChecked(false);
            }
        }
    });

    vh.textView.setText(item.getDate() +". "+item.getInfo());
    vh.textView.setChecked(Boolean.parseBoolean(status));

    return convertView;
}}

提前致谢.

推荐答案

那是因为您传递的列表(项目)具有旧值.当您更改检查状态时，将其更新为填充的列表(项目)到列表视图.滚动列表视图将再次加载它们的项目，在那里它获取旧值.

Thats because your list(items) which you passed has the old value.When you change the check status,update it to the list(items) which is populated to the listview.On Scroll the list view will load them items again, where it is getting the old value.

vh.textView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        autoid = item.getAutoid();

        if (! finalVh.textView.isChecked()) {
            finalVh.textView.setChecked(true);
            item.setStatus("true")
        } else {
            finalVh.textView.setChecked(false);
            item.setStatus("false");
        }
        items.set(position, item);
    }
});

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