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This is my item row of Parent list and I want to show dropdown at every item, but unable to return the object of DropDownMenuItm

 Container optionTile(double width,double height,int position)
 return Container(
 padding:EdgeInsets.only(top:width*0.03,bottom: width*0.03,left: width*0.03,right: width*0.03,),
 child: Column(
 children: <Widget>[
 Row(
 mainAxisAlignment: MainAxisAlignment.spaceBetween,
 children: <Widget>[
 Expanded(flex: 3,child: Text('$opAtrrList[position].groupname',style: TextStyle(color: Colors.grey,fontFamily: 'medium'), ),),
 Expanded(flex:4,child:Container(
 padding:EdgeInsets.only(top:width*0.00,bottom: width*0.00,left: width*0.04,right: width*0.00,),
 decoration: new BoxDecoration(
 color: Colors.white,
 border: Border.all(color: Colors.white, width: 0.0),
 //new Color.fromRGBO(255, 0, 0, 0.0),
 borderRadius:
 new BorderRadius.all(Radius.circular(45.0)),
 ), child: DropdownButton<Attribute>(
 value: opAtrrList[position].attrlist[0],
 items: opAtrrList[position].attrlist, //Here I'm uinable to set custom type of list
 )),
 //child: Text('$value',textAlign: TextAlign.right,style: TextStyle(color: MyColors.colorPrimary,fontFamily: 'semibold'), ),),
 ),
 ],
 ),
 ],
 ),
 );
 

here is my bean class

class OptionAttribute

 String _grouprowid;
 String _groupname;
 String _isrequired;
 List<Attribute> _attrlist;
 

I want Attribute list inside dropdown. I tried this and this but how can I set dynamic list inside drop down.