Unable to display ListView from SqFLite - flutter

Question

My data is able to upload to the database without any error, however i cant seem to display my listview with the data.
As you can see from the _submit() function, if theres an error, snackbar will be shown indicating theres an error and will not proceed to the mainpage, however, the result shows a snackbar with a success message,
So Im suspecting it has to do with my listview code, or my databasehelper as I may have missed out something in the code.
Any help is deeply appreciated!
Heres my listview code:
FutureBuilder<List<Note>>(
future: _databaseHelper.getNoteList(),
builder: (BuildContext context, AsyncSnapshot<List<Note>> snapshot){
if(snapshot.hasData){
return ListView.builder(
itemCount: _count,
itemBuilder: (BuildContext context, int position) {
Note note = snapshot.data[position];
return Card(
color: Colors.white,
elevation: 2.0,
child: new ListTile(
title: new Text(note.title),
subtitle: new Text(note.bodyText),
onTap: () =>
_navigateToEditAddPage(note, 'Edit a Note'),
onLongPress: () => _showDeleteDialog(note),
),
);
});
}else{
return Container(width: 0,height: 0,);
}
},),
Heres my insertData code:
void _submit() async {
if (_formKey.currentState.validate()) {
note.title = _titleController.text;
note.bodyText = _bodyTextController.text;
note.date = _dateController.text;
if (note.id == null) {
int result = await _databaseHelper.insertData(note);
if (result != 0) {
_moveToHomePage('Note successfully added');
} else {
_showSnackBar('Note unable to be inserted due to some error');
}
} else {
int result = await _databaseHelper.updateData(note);
if (result != 0) {
_moveToHomePage('Note successfully updated');
} else {
_showSnackBar('Note unable to be updated due to some error');
}
}
}
}
Heres my DatabaseHelper code:
class DatabaseHelper {
static Database _database;
String dataTable = 'NoteTable';
String colId = 'id';
String colTitle = 'title';
String colBody = 'bodyText';
String colDate = 'date';
DatabaseHelper._();
static final DatabaseHelper db = DatabaseHelper._();
Future<Database> get database async {
if (_database == null) {
_database = await initializeDatabase();
}
return _database;
}
Future<Database> initializeDatabase() async {
Directory directory = await getApplicationDocumentsDirectory();
String path = directory.path + 'notes.db';
var notesDatabase =
await openDatabase(path, version: 1, onCreate: _createDb);
return notesDatabase;
}
void _createDb(Database database, int newVersion) async {
await database.execute("CREATE TABLE $dataTable ("
"$colId INTEGER PRIMARY KEY AUTOINCREMENT,"
"$colTitle TEXT,"
"$colBody TEXT,"
"$colDate TEXT"
")");
}
Future<List<Map<String, dynamic>>> getNoteListMap() async {
Database db = await this.database;
var result = await db.query(dataTable);
return result;
}
Future<int> insertData(Note note) async {
Database db = await this.database;
var result = await db.insert(dataTable,note.toMap(),conflictAlgorithm:
ConflictAlgorithm.replace,);
return result;
}
Future<int> updateData(Note note) async {
Database db = await this.database;
var result = await db.update(dataTable,note.toMap(),
where: 'colId = ?', whereArgs: [note.id]);
return result;
}
Future<int> deleteData(Note note) async {
Database db = await this.database;
var result = await db
.delete(dataTable, where: 'colId = ?', whereArgs: [note.id]);
return result;
}
Future<int> getCount() async{
Database db = await this.database;
List<Map<String,dynamic>> x = await db.rawQuery('SELECT COUNT (*) from $dataTable');
int result = Sqflite.firstIntValue(x);
return result;
}
Future<List<Note>> getNoteList() async {
var noteMapList = await getNoteListMap();
int count = noteMapList.length;
//list of notes, each note consist of their own independent variables
List<Note> noteList;
for (int i = 0; i < count; i++) {
noteList.add(Note.fromMapObject(noteMapList[i]));
}
return noteList;
}
}
And lastly my Note model:
class Note {
int _id;
String _date;
String _title;
String _bodyText;
Note(this._date, this._title, this._bodyText);
Note.withId(this._id, this._date, this._title, this._bodyText);
set date(String date) {
this._date = date;
}
get date => _date;
set title(String title) {
this._title = title;
}
get title => _title;
set bodyText(String bodyText){
this._bodyText = bodyText;
}
get bodyText => _bodyText;
get id => _id;
Map<String, dynamic> toMap() {
var map = new Map<String, dynamic>();
if (_id != null) {
map['id'] = _id;
}
map['title'] = _title;
map['bodyText'] = _bodyText;
map['date'] = _date;
return map;
}
//Converting a map object to a note object
Note.fromMapObject(Map<String,dynamic> fromMap){
_id = fromMap['id'];
_title = fromMap['title'];
_bodyText = fromMap['bodyText'];
_date = fromMap['date'];
}
}

Answer 1

I found two errors in your code.
1: in getNoteList() of DatabaseHelper
List<Note> noteList;
to
List<Note> noteList = [];
2: in listview code
itemCount: _count,
to
itemCount: snapshot.data.length,
result: