在这里买颤振吐司包

将这个包添加到文件pubspec.yaml中的项目依赖项中。

然后当你想要吐司显示时，就像点击一个按钮:

Toast.show("Toast plugin app", context, duration: Toast.LENGTH_SHORT, gravity: Toast.BOTTOM);

如果目前给出的Fluttertoast包不奏效，那么我建议你试试吐司。

它没有装饰，也没有仪式。

它就是有用。 我注意到在它的README文件中给出的例子中有一个错误: Toast.show ( “吐司插件应用程序”， 持续时间:烤面包。LENGTH_SHORT, 重力:Toast.BOTTOM); 而该方法需要一个上下文。所以要像这样添加“上下文”: Toast.show ( "Toast插件应用" 持续时间:烤面包。LENGTH_SHORT, 重力:Toast.BOTTOM); 有一个机会，这将在你检查的时候被修复。我已经提交了PR。

用这个:

Fluttertoast.showToast(
    msg: "This is a Toast message",
    toastLength: Toast.LENGTH_SHORT,
    gravity: ToastGravity.CENTER,
    timeInSecForIos: 1
);

步骤1:

依赖关系:

flutter_just_toast: ^1.0.1

步骤2:

import 'package:flutter_just_toast/flutter_just_toast.dart';

步骤3:

Toast.show(
  message: "Your toast message",
  duration: Delay.SHORT,
  textColor: Colors.black);

对此，有不同的版本。

首先，您可以使用SnackBar，这是Flutter中的一个小部件。 您可以使用pub.dev中的toast - flutter_toast等库。 第三个版本是创建自定义小部件。它可以在Flutter中使用Overlay小部件和动画创建。

您可以通过本教程了解更多相关知识。这里有一个链接。

正如Darky指出的那样，SnackBar绝对是正确的类。

关于showSnackBar的一个棘手的事情是到达Scaffold state，如果你试图在构建方法中调用showSnackBar。

您可能会看到这样的错误，其中包括一些解释如何解决问题的文本。

══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
The following assertion was thrown while handling a gesture:
Scaffold.of() called with a context that does not contain a Scaffold.
No Scaffold ancestor could be found starting from the context that was passed to Scaffold.of(). This
usually happens when the context provided is from the same StatefulWidget as that whose build
function actually creates the Scaffold widget being sought.
There are several ways to avoid this problem. The simplest is to use a Builder to get a context that
is "under" the Scaffold. For an example of this, please see the documentation for Scaffold.of():
  https://docs.flutter.io/flutter/material/Scaffold/of.html
A more efficient solution is to split your build function into several widgets. This introduces a
new context from which you can obtain the Scaffold. In this solution, you would have an outer widget
that creates the Scaffold populated by instances of your new inner widgets, and then in these inner
widgets you would use Scaffold.of().
A less elegant but more expedient solution is assign a GlobalKey to the Scaffold, then use the
key.currentState property to obtain the ScaffoldState rather than using the Scaffold.of() function.
The context used was:
  MyHomePage
When the exception was thrown, this was the stack:
#0      Scaffold.of (package:flutter/src/material/scaffold.dart:444:5)
#1      MyHomePage.build.<anonymous closure> (/Users/jackson/Library/Developer/CoreSimulator/Devices/7072C907-DBAD-44FE-8F40-0257442C51D9/data/Containers/Data/Application/77FEC1A4-1453-442C-8208-96E0323DEFB2/tmp/so_scratch2Tkq9Jb/so_scratch2/lib/main.dart:23:24)
#2      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:323:14)
#3      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:375:30)
#4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
#5      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:149:9)
#6      TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:119:7)
#7      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
#8      BindingBase&SchedulerBinding&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20)
#9      BindingBase&SchedulerBinding&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
#10     BindingBase&SchedulerBinding&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
#11     BindingBase&SchedulerBinding&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
#12     BindingBase&SchedulerBinding&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
#13     _invoke1 (file:///b/build/slave/Mac_Engine/build/src/flutter/lib/ui/hooks.dart:100)
#14     _dispatchPointerDataPacket (file:///b/build/slave/Mac_Engine/build/src/flutter/lib/ui/hooks.dart:58)
Handler: onTap
Recognizer:
  TapGestureRecognizer#69dbc(debugOwner: GestureDetector, state: ready)
════════════════════════════════════════════════════════════════════════════════════════════════════

你可以将GlobalKey传递给你的Scaffold构造函数:

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final key = new GlobalKey<ScaffoldState>();
    return new Scaffold(
      key: key,
      floatingActionButton: new Builder(
        builder: (BuildContext context) {
          return new FloatingActionButton(
            onPressed: () {
              key.currentState.showSnackBar(new SnackBar(
                content: new Text("Sending Message"),
              ));
            },
            tooltip: 'Increment',
            child: new Icon(Icons.add),
          );
        }
      ),
    );
  }
}

或者你可以使用一个Builder来创建一个BuildContext，它是Scaffold的子对象。

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      floatingActionButton: new Builder(
        builder: (BuildContext context) {
          return new FloatingActionButton(
            onPressed: () {
              Scaffold.of(context).showSnackBar(new SnackBar(
                content: new Text("Sending Message"),
              ));
            },
            tooltip: 'Increment',
            child: new Icon(Icons.add),
          );
        }
      ),
    );
  }
}

最后，您可以将小部件分成多个类，这是最佳的长期方法。