Basic Widgets: {
Container
Row
Column
Image
Text
Icon
RaisedButton
Scaffold
Appbar
FlutterLogo
Placeholder
}
App structure and navigation： {
Scaffold
Appbar
BottomNavigationBar
TabBar
TabBarView
MaterialApp
WidgetsApp
Drawer
}
Buttons：{
RaisedButton
FloatingActionButton
FlatButton
IconButton
PopupMenuButton
ButtonBar
}
Input and selections：{
TextField
Checkbox
Switch
Radio
Slider
Date & Time Pickers
}
Dialogs, alerts, and panels：{
SimpleDialog
AlertDialog
BottomSheet
ExpansionPanel
SnackBar
}
Information displays：{
Image
Icon
Chip
Tooltip
DataTable
Card
LinearProgressIndicator
GridView
}
Layout ：{
ListTile
Stepper
Divider
}
