'if'条件在BaseAdapter中无法正常工作

Question

我在我的getView of BaseAdapter类中有这个代码：

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    View v;
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = inflater.inflate(R.layout.listview_item, parent, false);
    } else {
        v = convertView;
    }
    LinearLayout mLayout = v.findViewById(R.id.layout_list_item);

    if (!mList.get(position).isOperative()) {
        mLayout.setBackgroundResource(R.drawable.list_item_background_inactive);
    } else {
        mLayout.setBackgroundResource(R.drawable.list_item_background_active);
    }

    TextView mTextOne = v.findViewById(R.id.text_one);
    TextView mTextTwo = v.findViewById(R.id.text_two);

    mTextOne.setText(mList.get(position).getPropertyOne());
    mTextTwo.setText(mList.get(position).getPropertyTwo());

    return v;
}

在

if（！mList.get（position）.isOperative（））

我想做一个背景设置，背景在开始时正确应用，但如果我滚动，我将丢失初始设置。

在mList中有对象有3个属性（String propertyOne，propertyTwo，Boolean isOperative）。

有任何想法吗？

提前致谢！

Answer 1

我通过使用ViewHolder找到解决方案：

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if (convertView == null) {
        holder = new ViewHolder();
        convertView = LayoutInflater.from(mContext).inflate(R.layout.listview_item, null);
        holder.layoutOperative = convertView.findViewById(R.id.layout_list_item);
        holder.txtOne = convertView.findViewById(R.id.text_one);
        holder.txtTwo = convertView.findViewById(R.id.text_two);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    if (mBuildingsList.get(position).isOperative()) {
        holder.layoutOperative.setBackgroundResource(R.drawable.list_item_background_active);
    } else {
        holder.layoutOperative.setBackgroundResource(R.drawable.list_item_background_inactive);
    }

    holder.txtOne.setText(mList.get(position).getPropertyOne());
    holder.txtTwo.setText(mList.get(position).getPropertyTwo());

    return convertView;

}

谢谢大家！