android - 如何删除 ExpandableListView 中特定组(行)的箭头

Question

默认情况下，每个组都有一个向下的箭头，向用户指示该项目可以展开。但是，我有一组没有 child ；因此，我希望此项目上不显示箭头。

Answer 1

根据文档:

public void setGroupIndicator (Drawable groupIndicator)
Sets the indicator to be drawn next to a group.

ParametersgroupIndicator The drawable to be used as an indicator. If the group is empty, the state state_empty will be set. If the group is expanded, the state state_expanded will be set.

所以假设，这应该已经做了正确的事情...但是，如果您使用自己的自定义 ExpandableListAdapter，例如使用 TextViews，您可以使用以下代码:

// in your main file where the List is defined:
mExpandableList.setGroupIndicator(null); // this will remove the indicator

然后在您的自定义适配器中，您可以执行以下操作:

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {

    View v;
    ...
    // code to retrieve convertView or inflate new one and assign to v
    ...

    TextView tv = ((TextView) v);
    int iconId;  // assume we have an icon we want to have on the left of each group
    int expandableGroupResId;

    if (getChildrenCount(groupPosition) > 0) {
        if (isExpanded) expandableGroupResId = R.drawable.expander_ic_maximized;
        else expandableGroupResId = R.drawable.expander_ic_minimized;
    }
    tv.setCompoundDrawablesWithIntrinsicBounds(iconId, 0, expandableGroupResId, 0);
}