I'm using an API which returns the value like this.
[
{
"store": "AMAZON"
},
{
"store": "FLIPKART"
},
{
"store": "WALMART"
},
{
"store": "ALIBABA"
},
]
I need this to be in a drop down. I need a drop down button with this API data in it. Some one help please. I have tried many ways but nothing worked.
nigale try code:
List<String> markets = []; // Or var markets = [];
String _mySelection;
@override
void initState() {
buidDropDownItems();
super.initState();
}
//
void buidDropDownItems() async {
markets = await retrievedata.getMarket();
// Refresh the UI if the State object has been created
if(mounted){
setState(() {});
}
}
child: DropdownButton(
items: markets.map<DropdownMenuItem<String>>((String val){
return DropdownMenuItem<String>(value: val, child: Text(val));
}).toList(), // Get items from the available data in markets variable
onChanged: (sto) {
setState(() {
_mySelection = sto;
});
},
value: _mySelection,
hint: Text('Please select the store: '),
),
The function retrievedata.getMarket(); is returning Future<dynamic> which dynamic is your markets list.
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ The following NoSuchMethodError was thrown building homePage(dirty, state: homePageState#f375b): The method 'map' was called on null. Receiver: null Tried calling: map<DropdownMenuItem<String>>(Closure: (String) => DropdownMenuItem<String>) The relevant error-causing widget was: homePage 
List<String> markets = []; // Or var markets = []; initialize the markets listtype '(String) => DropdownMenuItem<String>' is not a subtype of type '(dynamic) => DropdownMenuItem<String>' of 'f' Like the same from morning. Please solve this alone.There should be exactly one item with [DropdownButton]'s value: . Either zero or 2 or more [DropdownMenuItem]s were detected with the same value 'package:flutter/src/material/dropdown.dart': Failed assertion: line 834 pos 15: 'items == null || items.isEmpty || value == null || items.where((DropdownMenuItem<T> item) { return item.value == value; }).length == 1' The relevant error-causing widget was: homePage let's say that this array is retrieved in a variable called data
List<String>list=[];
for(var itemData in data){
list.add(itemData['store']);
}
And wala, Now list conation array of String ready to be used
