flutter - 如何弹出文字？

Question

我想在不更改屏幕任何内容的情况下，将居中文本弹出3秒钟以进行交流。一切保持不变，仅显示文本几秒钟。我怎样才能做到这一点？

Answer 1

您可以在下面复制粘贴运行完整代码
您可以使用https://pub.dev/packages/fluttertoast软件包
程式码片段

fToast.showToast(
      child: Container(
        color: Colors.red,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text("Hello"),
            Text("World"),
            Text("Hello"),
            Text("World"),
            Text("Hello"),
            Text("World"),
          ],
        ),
      ),
      gravity: ToastGravity.CENTER,
      toastDuration: Duration(seconds: 3),
    );

工作演示

完整的代码

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  FToast fToast;

  @override
  void initState() {
    super.initState();
    fToast = FToast();
    fToast.init(context);
  }

  void _showMessage() {
    fToast.showToast(
      child: Container(
        color: Colors.red,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text("Hello"),
            Text("World"),
            Text("Hello"),
            Text("World"),
            Text("Hello"),
            Text("World"),
          ],
        ),
      ),
      gravity: ToastGravity.CENTER,
      toastDuration: Duration(seconds: 3),
    );

    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _showMessage,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}