Cập nhật ImageIcon trong flutter

ImageIcon(
     AssetImage("images/icon_more.png"),
     color: Color(0xFF3A5A98),
),

Load data before Widget build in flutter

 @override
  initState() {
    super.initState();

    loadData().then((result) {
      print(result);
      setState(() {
       asyncWidget = result;
      });
    });
  }

  loadData() async {
    var widget = new AsyncWidget();
    return widget.build();
  }

  @override
  Widget build(BuildContext context) {

    if(asyncWidget == null) {
      return new Scaffold(
        appBar: new AppBar(
          title: new Text("Loading..."),
        ),
      );
    } else {
      return new Scaffold(
        appBar: new AppBar(
          title: new Text(widget.title),
        ),
        body: new Center(
          child: this.asyncWidget,
        ),
      );
    }
  }
}

Bo viền flutter

Container(
            margin: EdgeInsets.all(32),
            decoration: BoxDecoration(border: Border.all(color: Colors.red)),
            child: ListView(
              shrinkWrap: false,
              children: <Widget>[
                ListTile(title: Text('Item 1')),
                ListTile(title: Text('Item 2')),
                ListTile(title: Text('Item 3')),
              ],
            ),

Ẩn keyboard trong flutter

FocusScope.of(context).requestFocus(new FocusNode());

Check the device in Flutter

f (Platform.isIOS) {
  print('is a IOS');
} else if (Platform.isAndroid) {
  print('is a Andriod');
} 

Copy text in flutter

Clipboard.setData(new ClipboardData(text: text));

a snackbar in flutter

final snackBar = SnackBar(content: Text('Yay! A SnackBar!'));

// Find the Scaffold in the widget tree and use it to show a SnackBar.
Scaffold.of(context).showSnackBar(snackBar);