Android的默认组指标ExpandableListView [英] Android default group indicator ExpandableListView

问题描述

我使用的可扩展列表视图，一个用户可以选择的数据。

I'm using an expandable list view where an user can select data.

用户可以选择任一组中，无论是儿童。为了便于2之间的区别，我有2个选项单选按钮组：

The user can select either the group, either the child. To facilitate the distinction between the 2, I have a radio group with 2 options :

• 选择孩子：正常扩展列表（可能扩大
  组，然后选择子）


• 选择组：所有组都塌了，用户不能展开组

我需要什么，是隐藏在第二种情况下，组指示灯，然后选择第一个选项时恢复它。

What I need, is to hide the group indicator on the second case, and then restore it when the first option is selected.

下面是我的code：

rgLink.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            if(checkedId == R.id.rb_link_subject){ //Here is the child mode
                mLinkType = LINK_SUBJECT;
                //elvSubject.setGroupIndicator(/*Here I need the default group indicator*/);
            }
            else{                                  //Here is the group mode
                collapseAllChildren();
                //The line below hide the group indicator
                elvSubject.setGroupIndicator(null);
                mLinkType = LINK_CATEGORY;
            }
        }
    });

我还使用，为集团项目：

I'm also using, for the group item :

style="?android:attr/listSeparatorTextViewStyle" 

所以基本上，我只需要一个行code，恢复默认组指标。我怎样才能做到这一点？

So basically, I just need a one line code to restore the default group indicator. How can I do this ?

推荐答案

您可以从当前主题获得一个属性：

You can obtain an attribute from the current theme:

 //obtain expandableListViewStyle  from theme
 TypedArray expandableListViewStyle = context.getTheme().obtainStyledAttributes(new int[]{android.R.attr.expandableListViewStyle});
 //obtain attr from style
 TypedArray groupIndicator = context.getTheme().obtainStyledAttributes(expandableListViewStyle.getResourceId(0,0),new int[]{android.R.attr.groupIndicator});
 elvSubject.setGroupIndicator(groupIndicator.getDrawable(0));
 expandableListViewStyle.recycle();
 groupIndicator.recycle();

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