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SnackBar({
    Key key,
    @required this.content,
    this.backgroundColor,
    this.action,
    this.duration = _kSnackBarDisplayDuration,
    this.animation,
  })

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final bar = _snackSample();
_key.currentState.showSnackBar(bar);

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 Widget _snackSample() => SnackBar(
        content: Text(
          "You have a message!",
          style: TextStyle(
            color: TEXT_BLACK,
            fontSize: 20,
          ),
          textAlign: TextAlign.center,
        ),
        backgroundColor: BLUE_LIGHT,

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import "package:flutter/material.dart";
import 'package:flutter_widgets/const/_const.dart';

class SnackPage extends StatefulWidget {
  @override
  _SnackState createState() => _SnackState();
}

class _SnackState extends State<SnackPage> {
  GlobalKey<ScaffoldState> _key = GlobalKey();

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 Widget _alertDialog() => AlertDialog(
        title: Text(
          "How to follow us?",
          textAlign: TextAlign.center,
        ),
        titleTextStyle: TextStyle(
            color: TEXT_BLACK, fontSize: 30, fontWeight: FontWeight.w700),
        titlePadding: EdgeInsets.symmetric(horizontal: 30, vertical: 20),
        content: Text("1. You should login in the facebook.\n"
            "2. You should search the Flutter Open.\n"

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AlertDialog({
    Key key,
    this.title,
    this.titlePadding,
    this.titleTextStyle,
    this.content,
    this.contentPadding = const EdgeInsets.fromLTRB(24.0, 20.0, 24.0, 24.0),
    this.contentTextStyle,
    this.actions,
    this.backgroundColor,

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 Widget _shapeDialog() => SimpleDialog(
        title: Text(
          "Be careful!",
          textAlign: TextAlign.center,
        ),
        children: <Widget>[
          Text(
            "If you write a message, you should care about the message.",
            textAlign: TextAlign.center,
          ),

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  Widget _colorDialog() => SimpleDialog(
        title: Text(
          "Message",
          textAlign: TextAlign.center,
        ),
        children: <Widget>[
          Text(
            "You must learn it carefully.",
            textAlign: TextAlign.center,
          ),

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Widget _padDialog() => SimpleDialog(
        title: Text(
          "Do you know why?",
          textAlign: TextAlign.center,
        ),
        titlePadding: EdgeInsets.symmetric(
          horizontal: 30,
          vertical: 20,
        ),
        children: <Widget>[

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SimpleDialog({
    Key key,
    this.title,
    this.titlePadding = const EdgeInsets.fromLTRB(24.0, 24.0, 24.0, 0.0),
    this.children,
    this.contentPadding = const EdgeInsets.fromLTRB(0.0, 12.0, 0.0, 16.0),
    this.backgroundColor,
    this.elevation,
    this.semanticLabel,
    this.shape,