Flutter异步任务执行插件async_executor的使用

Flutter 异步任务执行插件 async_executor 的使用

Async Executor 是一个工具，允许你执行任何异步函数，并处理加载过程和错误捕获，同时使用标准弹窗。

示例

以下是一个完整的示例代码，展示了如何在 Flutter 应用中使用 async_executor 插件。

import 'dart:developer';

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

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

class MyApp extends StatelessWidget {
  // 这个小部件是你的应用的根组件。
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Async Executor Demo',
      theme: ThemeData(
        // 这是你应用的主题。
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final AsyncExecutor normal = AsyncExecutor();
  final AsyncExecutor custom = AsyncExecutor(
    loadingMessage: (BuildContext context) async {
      await showDialog(
        context: context,
        barrierDismissible: false,
        builder: (context) {
          return WillPopScope(
            onWillPop: () async => false,
            child: Column(
              mainAxisSize: MainAxisSize.min,
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Material(
                  color: Colors.transparent,
                  child: Container(
                    height: 60,
                    child: Center(
                      child: CircularProgressIndicator(
                        backgroundColor: Colors.green,
                      ),
                    ),
                  ),
                )
              ],
            ),
          );
        },
      );
    },
    errorMessage: (
      BuildContext context,
      dynamic error,
    ) async {
      return await showDialog(
        context: context,
        builder: (dialogContext) {
          return AlertDialog(
            title: Text("错误"),
            content: Text(
              "$error",
              style: TextStyle(color: Colors.red),
            ),
            actions: [
              TextButton(
                child: Text("确定"),
                onPressed: () {
                  Navigator.pop(dialogContext);
                },
              )
            ],
          );
        },
      );
    },
  );

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Async Executor Demo'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          ElevatedButton(
            onPressed: () {
              normal.run(
                  context: context,
                  onExecute: () async {
                    await Future.delayed(Duration(seconds: 3));
                  },
                  onFinish: (dynamic value) {
                    log("on finish");
                  });
            },
            child: Text("正常模式"),
          ),
          ElevatedButton(
            onPressed: () {
              normal.run(
                  context: context,
                  onExecute: () async {
                    await Future.delayed(Duration(seconds: 3));
                    throw Exception("异常");
                  },
                  onFinish: (dynamic value) {
                    log("on finish");
                  });
            },
            child: Text("正常模式带错误"),
          ),
          ElevatedButton(
            onPressed: () {
              custom.run(
                  context: context,
                  onExecute: () async {
                    await Future.delayed(Duration(seconds: 3));
                  },
                  onFinish: (dynamic value) {
                    log("on finish");
                  });
            },
            child: Text("自定义模式"),
          ),
          ElevatedButton(
            onPressed: () {
              custom.run(
                  context: context,
                  onExecute: () async {
                    await Future.delayed(Duration(seconds: 3));
                    throw Exception("异常");
                  },
                  onFinish: (dynamic value) {
                    log("on finish");
                  });
            },
            child: Text("自定义模式带错误"),
          ),
        ],
      ),
    );
  }
}