Android 对组使用两个不同的视图持有者时ExpandableListView类CastException

当使用两个不同的

视图持有者时，我得到一个
ClassCastException
对于我的组，请在
可扩展列表视图中查看

我有一个单独的
ViewHolder
用于位置0的组。其余的组使用不同的组

此错误发生在我已通过向下滚动并向上滚动到位置0的组来创建视图之后

我知道我的问题在这方面：
vPropertyInfo=（ViewHolderPropertyInfo）convertView.getTag（）

当我滚动回组位置0时，它尝试将
（ViewHolderPropertyInfo）
强制转换为
转换视图
，该视图不为空，但实际上是
（ViewHolderGroup）
类型。我如何解决这个问题

@Override
public View getGroupView(int groupPosition, boolean isExpandable, View convertView, ViewGroup parent) {
    if (groupPosition == 0) {
        ViewHolderPropertyInfo vhPropertyInfo;

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.row_property_info, null);

            vhPropertyInfo = new ViewHolderPropertyInfo();
            vhPropertyInfo.mTvName = (TextView) convertView.findViewById(R.id.tv_name);
            vhPropertyInfo.mTvCountry = (TextView) convertView.findViewById(R.id.tv_country);
            vhPropertyInfo.mTvCity = (TextView) convertView.findViewById(R.id.tv_city);
            vhPropertyInfo.mTvDistrict = (TextView) convertView.findViewById(R.id.tv_district);
            vhPropertyInfo.mTvPostalCode = (TextView) convertView.findViewById(R.id.tv_postal_code);
            vhPropertyInfo.mTvStreet = (TextView) convertView.findViewById(R.id.tv_street);
            vhPropertyInfo.mTvSubStreet = (TextView) convertView.findViewById(R.id.tv_sub_street);

            convertView.setTag(vhPropertyInfo);
        }
        else {
            vhPropertyInfo = (ViewHolderPropertyInfo) convertView.getTag();
        }

        vhPropertyInfo.mTvName.setText("House Lannister");
        vhPropertyInfo.mTvCountry.setText("Westeros");
        vhPropertyInfo.mTvCity.setText("Kings Landing");
        vhPropertyInfo.mTvDistrict.setText("West Side");
        vhPropertyInfo.mTvPostalCode.setText("12345");
        vhPropertyInfo.mTvStreet.setText("123 Kings Lane");
        vhPropertyInfo.mTvSubStreet.setText("Hut 23");

        return convertView;
    }
    else {
        ViewHolderGroup vhGroup;

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.row_property_group, null);

            vhGroup = new ViewHolderGroup();
            vhGroup.mTvName = (TextView) convertView.findViewById(R.id.tv_name);

            convertView.setTag(vhGroup);
        }
        else {
            vhGroup = (ViewHolderGroup) convertView.getTag();
        }

        // Group 0 is property info so have to subtract one position
        vhGroup.mTvName.setText(getGroup(groupPosition));

        return convertView;
    }
}

public final class ViewHolderGroup {
    public TextView mTvName;
}

public final class ViewHolderPropertyInfo {
    public TextView mTvName;
    public TextView mTvCountry;
    public TextView mTvCity;
    public TextView mTvDistrict;
    public TextView mTvPostalCode;
    public TextView mTvStreet;
    public TextView mTvSubStreet;
}

编辑1：所以我解决了这个问题，但是检查了
convertView.getTag（）
的实例是否与ViewHolder类型相同，但是我的解决方案似乎不是很优雅。有人知道清洁剂的方法吗？

@Override
public View getGroupView(int groupPosition, boolean isExpandable, View convertView, ViewGroup parent) {
    if (groupPosition == 0) {
        ViewHolderPropertyInfo vhPropertyInfo;

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.row_property_info, null);

            vhPropertyInfo = new ViewHolderPropertyInfo();
            vhPropertyInfo.mTvName = (TextView) convertView.findViewById(R.id.tv_name);
            vhPropertyInfo.mTvCountry = (TextView) convertView.findViewById(R.id.tv_country);
            vhPropertyInfo.mTvCity = (TextView) convertView.findViewById(R.id.tv_city);
            vhPropertyInfo.mTvDistrict = (TextView) convertView.findViewById(R.id.tv_district);
            vhPropertyInfo.mTvPostalCode = (TextView) convertView.findViewById(R.id.tv_postal_code);
            vhPropertyInfo.mTvStreet = (TextView) convertView.findViewById(R.id.tv_street);
            vhPropertyInfo.mTvSubStreet = (TextView) convertView.findViewById(R.id.tv_sub_street);

            convertView.setTag(vhPropertyInfo);
        }
        else {
            if (convertView.getTag() instanceof ViewHolderPropertyInfo) {
                vhPropertyInfo = (ViewHolderPropertyInfo) convertView.getTag();
            }
            else {
                convertView = mInflater.inflate(R.layout.row_property_info, null);

                vhPropertyInfo = new ViewHolderPropertyInfo();
                vhPropertyInfo.mTvName = (TextView) convertView.findViewById(R.id.tv_name);
                vhPropertyInfo.mTvCountry = (TextView) convertView.findViewById(R.id.tv_country);
                vhPropertyInfo.mTvCity = (TextView) convertView.findViewById(R.id.tv_city);
                vhPropertyInfo.mTvDistrict = (TextView) convertView.findViewById(R.id.tv_district);
                vhPropertyInfo.mTvPostalCode = (TextView) convertView.findViewById(R.id.tv_postal_code);
                vhPropertyInfo.mTvStreet = (TextView) convertView.findViewById(R.id.tv_street);
                vhPropertyInfo.mTvSubStreet = (TextView) convertView.findViewById(R.id.tv_sub_street);

                convertView.setTag(vhPropertyInfo);
            }
        }

        vhPropertyInfo.mTvName.setText("House Lannister");
        vhPropertyInfo.mTvCountry.setText("Westeros");
        vhPropertyInfo.mTvCity.setText("Kings Landing");
        vhPropertyInfo.mTvDistrict.setText("West Side");
        vhPropertyInfo.mTvPostalCode.setText("12345");
        vhPropertyInfo.mTvStreet.setText("123 Kings Lane");
        vhPropertyInfo.mTvSubStreet.setText("Hut 23");

        return convertView;
    }
    else {
        ViewHolderGroup vhGroup;

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.row_property_group, null);

            vhGroup = new ViewHolderGroup();
            vhGroup.mTvName = (TextView) convertView.findViewById(R.id.tv_name);

            convertView.setTag(vhGroup);
        }
        else {
            if (convertView.getTag() instanceof ViewHolderGroup) {
                vhGroup = (ViewHolderGroup) convertView.getTag();
            }
            else {
                convertView = mInflater.inflate(R.layout.row_property_group, null);

                vhGroup = new ViewHolderGroup();
                vhGroup.mTvName = (TextView) convertView.findViewById(R.id.tv_name);

                convertView.setTag(vhGroup);
            }
        }

        // Group 0 is property info so have to subtract one position
        vhGroup.mTvName.setText(getGroup(groupPosition));

        return convertView;
    }
}

我找到了一种更优雅的方法来解决问题。它是在检查
convertView==null
之前执行
convertView.getTag（）
检查ViewHolder的实例

@Override
public View getGroupView(int groupPosition, boolean isExpandable, View convertView, ViewGroup parent) {
    if (groupPosition == 0) {
        ViewHolderPropertyInfo vhPropertyInfo;

        if (convertView != null && !(convertView.getTag() instanceof ViewHolderPropertyInfo)) {
            convertView = null;
        }

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.row_property_info, null);

            vhPropertyInfo = new ViewHolderPropertyInfo();
            vhPropertyInfo.mTvName = (TextView) convertView.findViewById(R.id.tv_name);
            vhPropertyInfo.mTvCountry = (TextView) convertView.findViewById(R.id.tv_country);
            vhPropertyInfo.mTvCity = (TextView) convertView.findViewById(R.id.tv_city);
            vhPropertyInfo.mTvDistrict = (TextView) convertView.findViewById(R.id.tv_district);
            vhPropertyInfo.mTvPostalCode = (TextView) convertView.findViewById(R.id.tv_postal_code);
            vhPropertyInfo.mTvStreet = (TextView) convertView.findViewById(R.id.tv_street);
            vhPropertyInfo.mTvSubStreet = (TextView) convertView.findViewById(R.id.tv_sub_street);

            convertView.setTag(vhPropertyInfo);
        }
        else {
            vhPropertyInfo = (ViewHolderPropertyInfo) convertView.getTag();
        }

        vhPropertyInfo.mTvName.setText("House Lannister");
        vhPropertyInfo.mTvCountry.setText("Westeros");
        vhPropertyInfo.mTvCity.setText("Kings Landing");
        vhPropertyInfo.mTvDistrict.setText("West Side");
        vhPropertyInfo.mTvPostalCode.setText("12345");
        vhPropertyInfo.mTvStreet.setText("123 Kings Lane");
        vhPropertyInfo.mTvSubStreet.setText("Hut 23");

        return convertView;
    }
    else {
        ViewHolderGroup vhGroup;

        if (convertView != null && !(convertView.getTag() instanceof ViewHolderGroup)) {
            convertView = null;
        }

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.row_property_group, null);

            vhGroup = new ViewHolderGroup();
            vhGroup.mTvName = (TextView) convertView.findViewById(R.id.tv_name);

            convertView.setTag(vhGroup);
        }
        else {
            vhGroup = (ViewHolderGroup) convertView.getTag();
        }

        // Group 0 is property info so have to subtract one position
        vhGroup.mTvName.setText(getGroup(groupPosition));

        return convertView;
    }
}