ExpandableRecycleView_In_Expand_Only_One_Item

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private ExpandableGroup mLastExpandedGroup ;
@override public void onGroupExpanded(ExpandableGroup group) {
if (mLastExpandedGroup != null
&& !mLastExpandedGroup.equals(group)
&& adapter.isGroupExpanded(mLastExpandedGroup)) {
adapter.toggleGroup(mLastExpandedGroup);
}
mLastExpandedGroup = group;
}

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