type _Uint8ArrayView' is not a subtype of type 'String' in Flutter
I am working in a similar problem, but trying to fetch GIS geography types from postgres.
In your case, if you are really really sure it is a String you can use utf8.decode(uint8List). In the constructor, see example:
IoTDevice(index, mac, imei, backend, ByteData lastpos, status, lockstatus,
powerstatus, id, chargestatus, Uint8List lastping){
this.index = index;
this.mac = '';
for (final byte in mac){
this.mac += byte.toRadixString(16);
/// In your case, you should use: this.mac = utf8.decode(mac)
}
print('mac ${this.mac}');
this.imei = imei;
this.backend = backend;
if(lastpos != null){
var longitude = lastpos.getFloat64(0);//Still errors here, trying to solve
var latitude = lastpos.getFloat64(8); //Still errors here, trying to solve
print('Longitude: ${longitude}');
print('Latitude: ${latitude}');
this.lastpos = LatLng(longitude, latitude);
}
else {
this.lastpos = null;
}
print('lastpos ${this.lastpos}');
this.status = status;
this.lockstatus = lockstatus;
this.powerstatus = powerstatus;
this.id = id;
this.chargestatus = chargestatus;
lastping != null ? this.lastping = DateTime.tryParse(new String.fromCharCodes(lastping).trim()) : this.lastping = null;
print('lastping ${this.lastping}');
}
static IoTDevice fromDynamicMap(Map<String, dynamic> map) => IoTDevice(
map['index'],
map['mac'],
map['imei'],
map['backend'],
map['lastpos'],
map['status'],
map['lockstatus'],
map['powerstatus'],
map['id'],
map['chargestatus'],
map['lastping']
);
If it's not a String it will launch an Offset error.
Then you have to go with ByteData and pray all the gods available. I am on this point right now, if I get any enlightment I will let you know.
EDIT: Additional information on how the Uint8Arrayviews come in here Unreadable Int16 from UInt8List, wrong data when cast asByteArray
I hope between both comments you can fix it
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Paresh Mangukiya
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Updated on December 26, 2022Comments
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Paresh Mangukiya 11 months
I fetch the data from the SQLite database in my app and show that data as a list, but when I get the value and I trying to manipulate data, I am getting this error
I am getting this error.
type '_Uint8ArrayView' is not a subtype of type 'String'
I show data on this
FutureBuilder<List<QuestionModel>>( future: DatabaseHelper.instance.getQuestionList(), builder: (BuildContext context, AsyncSnapshot snapshot) { if (snapshot.hasData) { return ListView.builder( itemCount: snapshot.data.length, itemBuilder: (BuildContext context, int index) { QuestionModel item = snapshot.data[index]; return ListTile( title: Text(item.questionen), leading: Text(item.id.toString()), ); }, ); } else if(snapshot.hasError){ print('Error-------> ${snapshot.error}'); return Text('Error: ${snapshot.error}'); } else { return Center(child: CircularProgressIndicator()); } }, )
This is my model class
class QuestionModel { int id; String questionen; String opta; String optb; String optc; int answer; String imgpath; QuestionModel( {this.id, this.questionen, this.opta, this.optb, this.optc, this.answer, this.imgpath}); factory QuestionModel.fromMap(Map<String, dynamic> json) => new QuestionModel( id: json["id"] ?? "", questionen: json["questionen"] ?? "", opta: json["opta"] ?? "", optb: json["optb"] ?? "", optc: json["optc"] ?? "", answer: json["answer"] ?? "", imgpath: json["imgpath"] ?? "", ); }
This is the function of fetch data from the database
Future<List<QuestionModel>> getQuestionList() async { final db = await database; var res = await db.query("question_data"); print(res.toString()); List<QuestionModel> queList = res.isNotEmpty ? res.map((c) => QuestionModel.fromMap(c)).toList() : []; return queList; }