Flutter :从另一个Dart文件获取AlertDialog

import 'package:flutter/material.dart';

void showAlertDialog(BuildContext context, String title, String message) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: Text(title),
        content: Text(message),
        actions: <Widget>[
          FlatButton(
            child: Text('确定'),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
        ],
      );
    },
  );
}

import 'package:flutter/material.dart';
import 'package:your_project_name/dialog_utils.dart';

// ...

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

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

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Demo'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('显示对话框'),
          onPressed: () {
            showAlertDialog(context, '提示', '这是一个AlertDialog示例');
          },
        ),
      ),
    );
  }
}