Android-如何更改可扩展listView中单个孩子的背景颜色？

Question

我想更改活动中onChildClick（）方法之外的Expandable list View的子项的背景颜色。 这是我的适配器

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;

public ExpandableListAdapter(Context context, List<String> listDataHeader,
                             HashMap<String, List<String>> listChildData) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
}

@Override
public Object getChild(int groupPosition, int childPosititon) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .get(childPosititon);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, final int childPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {

    final String childText = (String) getChild(groupPosition, childPosition);

    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_item, null);
    }

    TextView txtListChild = (TextView) convertView
            .findViewById(R.id.lblListItem);

    txtListChild.setText(childText);
    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .size();
}

@Override
public Object getGroup(int groupPosition) {
    return this._listDataHeader.get(groupPosition);
}

@Override
public int getGroupCount() {
    return this._listDataHeader.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_group, null);
    }

    TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.lblListHeader);
    lblListHeader.setTypeface(null, Typeface.BOLD);
    lblListHeader.setText(headerTitle);

    return convertView;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

我应该使用getChildView吗？ 如expListView.getExpandableListAdapter().getChildView(0,1, ?, ?, ? ).setBackgroundColor(Color.BLUE); 有人可以给我一个例子吗？

Answer 1

根据系统对清单物料的回收，您永远无法确定子物料的位置pr获取物料视图本身以设置其背景

因此，您将必须执行以下操作；

1-为子项数据创建一个对象模型2-为其提供布尔属性isColored 3-在getChildView（）中执行以下操作：

 if (listDataHeader.get(groupPosition).getSessionsList().get(childPosition).isColored()) {
        convertView.setBackgroundColor(Color.parseColor(color));
        notifyDataSetChanged();
    } else {
        convertView.setBackgroundColor(context.getResources().getColor(R.color.white));
        notifyDataSetChanged();
    }

如果对象isColored为true，则为其提供颜色，否则，将其设置为默认颜色，以避免其他项目因回收而着色

希望我回答的帮助