Flutter——消息框（Fluttertoast）

• 引入依赖：

dependencies:
  fluttertoast: ^3.1.3

import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';

void main() {
  runApp(MaterialApp(
    title: "DialogWidget",
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  _toast(){
    Fluttertoast.showToast(
      msg: "登录成功",
      toastLength: Toast.LENGTH_LONG,
      gravity: ToastGravity.BOTTOM,  // 消息框弹出的位置
      timeInSecForIos: 1,  // 消息框持续的时间（目前的版本只有ios有效）
      backgroundColor: Colors.red,
      textColor: Colors.white,
      fontSize: 16.0
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RaisedButton(
          child: Text("toast"),
          onPressed: _toast,
        ),
      )
    );
  }
}