title: DropdownButtonFormField dosn't show the value that selected flutter
body: <p>This is my code and I tried to print the value in my console to figure if it is work and it's correctly printed but it dose not show in the text Filed. When I chose the hint text disappear but no thing show also I changed the Icon (arrow) size but when I click on any part of it, no response until I click in the corner</p>
  <pre><code>String _medicationDesc;
  List&lt;DropdownMenuItem&gt; getDropDownItem() {
  List&lt;DropdownMenuItem&gt; dropDownItems = [];
  for (String dose in medcationDose) {
  var newItem = DropdownMenuItem(
  child: Text(
  dose,
  style: textStyle1,
  ),
  value: dose,
  );
  dropDownItems.add(newItem);
  }
  return dropDownItems;
  }
  
  List&lt;String&gt; medcationDose = [
  'مرة واحدة في اليوم',
  'مرتان في اليوم',
  'ثلاث مرات في اليوم',
  'اربعة مرات في اليوم',
  'وقت الحاجة'
  ];
  @override
  Widget build(BuildContext context) {
  return Scaffold(
  appBar: AppBar(backgroundColor: nave),
  body: SingleChildScrollView(
  child: Container(
  margin: EdgeInsets.fromLTRB(0.0, 30, 0, 0),
  child: Column(
  mainAxisAlignment: MainAxisAlignment.spaceBetween,
  children: [
  Column(
  children: [
  SizedBox(
  height: 50,
  width: 350,
  child: DropdownButtonFormField(
  value: _medicationDose,
  items: getDropDownItem(),
  iconSize: 50,
  iconEnabledColor: white,
  onChanged: (value) {
  setState(() {
  _medicationDose = value;
  });
  },
  decoration: InputDecoration(
  hintText: 'الجرعة',
  
  ),
  ),
  </code></pre>