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I want to any way set Full Width 100% in dart/flutter. but it is not set in dropdown list in flutter. my source code below in details.

 Container(  height: 50,  width: 500.0,  // width: MediaQuery.of(context).size.width,  child: Expanded(  child: DropdownButtonHideUnderline(  child: ButtonTheme(  alignedDropdown: true,  child: DropdownButton(  isExpanded: true,  value: _selectionRetailer,  style: Theme.of(context).textTheme.bodyText1,  // items: mRetailList.map((index) {  items: mRouteWiseRetailList.map((index) {  return DropdownMenuItem(  alignment: Alignment.center,  child: new Text(  index.retailerTitle   "_"   index.retailerAddress,  style: TextStyle(fontSize: 10),  ),  value: index.retailerID,  );  }).toList(),   onChanged: (sal) {  setState(() {  mRetailer = sal;  _selectionRetailer = sal;  retailerID = sal;  print("SAVEDATADD"   "retailerID: $retailerID");  if (reasonID == "0") {  } else {  startTime = Fhelper.CurrentDateTime();  Fhelper.showToast(  "RetailerID: $retailerID, StartTime: $startTime, salesOfficerID: $salesOfficerID");  print("SAVEDATADD"    "RetailerID: $retailerID, StartTime: $startTime, salesOfficerID: $salesOfficerID,entryBy : $entryBy");  clearAll();  }  });  },  ),  ),  ),  ), ),  

как достичь этой полной ширины в раскрывающемся списке в flutter.

Удалите Expanded и Container и следуйте приведенному ниже коду

 DropdownButtonHideUnderline(  child: ButtonTheme(  alignedDropdown: true,  child: DropdownButton(  isExpanded: true,  value: dropdownvalue,  icon: Icon(Icons.keyboard_arrow_down),  items:items.map((String items) {  return DropdownMenuItem(  value: items,  child: Text(items)  );  }  ).toList(),  onChanged: (String newValue){  setState(() {  dropdownvalue = newValue;  });  },  ),  ),  )