clean future builder for new data - flutter

Question

i'm using a builder for a search page in my application, basically i get data from a json file,
my issue is that if i try to search for a new word, the old result will still be shown and the new one are going to be shown under them.
here is how i get data from my website:
Future<List<Note>> fetchNotes() async {
var url = 'https://sample.com/';
var response = await http.get(url + _controller.text.trim());
var notes = List<Note>();
if (response.statusCode == 200) {
var notesJson = json.decode(response.body);
for (var noteJson in notesJson) {
notes.add(Note.fromJson(noteJson));
}
} else {
ercode = 1;
}
return notes;
}
fetchNotes().then((value) {
setState(() {
_notes.addAll(value);
});
});
if (_notes[0] == null) {
ercode = 2;
}
}
and i display data like this:
here is full example for showing that data

Answer 1

I think you should use "clear()".
fetchNotes().then((value) {
setState(() {
_notes.clear();
_notes.addAll(value);
});
});