Android default group indicator ExpandableListView

android, expandablelistview

Solution

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();

Problem

I'm using an expandable list view where an user can select data. 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 : - Select the child : normal expandable list (possibility to expand group and select child) - Select the group : all the groups are collapsed, and the user can't expand the group What I need, is to hide the group indicator on the second case, and then restore it when the first option is selected. Here is my 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; } } }); ``` I'm also using, for the group item : ``` style="?android:attr/listSeparatorTextViewStyle" ``` So basically, I just need a one line code to restore the default group indicator. How can I do this ?

Original source