Flutter foundation -042-DropDownButton dropdown menu

class _MyHomePageState extends State<MyHomePage> { String value = "3"; @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar(), body: new Column( children: <Widget>[ new Center( child: new DropdownButton( items: <DropdownMenuItem<String>>[ DropdownMenuItem(child: Text("1111",style: TextStyle(color: value=="1"?Colors.red:Colors.grey),),value: "1",), DropdownMenuItem(child: Text("2222",style: TextStyle(color: value=="2"?Colors.red:Colors.grey),),value: "2",), DropdownMenuItem(child: Text("3333",style: TextStyle(color: value=="3"?Colors.red:Colors.grey),),value: "3",), DropdownMenuItem(child: Text("4444",style: TextStyle(color: value=="4"?Colors.red:Colors.grey),),value: "4",),], hint:new Text(" hint "),// Display onChanged when there is no initial value: (selectValue){setState(() {value = selectValue;});}, value: value,// Set the initial value, which is the same as the value in the list elevation: 10,// Set the shadow style: new TextStyle(// set the text inside the text box color: color. blue, fontSize: 15), iconSize: 30,// Set icon underline: Container(height: 1,color: color.blue,),),],); }}Copy the code