鸿蒙harmonyos next flutter混合开发之开发FFI plugin

• 创建FFI plugin summation，默认创建的FFI plugin是求两个数的和

  flutter create --template=plugin_ffi summation --platforms=android,ios,ohos

• 创建my_application

  flutter create --org com.example my_application

• 在my_application项目中文件pubspec.yaml引用summation

  summation:
    path: /Users/administrator/Desktop/workspace/summation
  

• my_application中调用summation

  import 'package:flutter/material.dart';
  import 'package:summation/summation.dart' as summation;

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

  class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
  

  }

  class _MyAppState extends State<MyApp> {
  int sumResult = 0;
  int sumAsyncResult = 0;

  @override
  void initState() {
    super.initState();
    sumResult = summation.sum(1, 2);
     summation.sumAsync(3, 4).then((value) {
       sumAsyncResult = value;
       setState(() {
  
       });
     });
  }
  
  @override
  Widget build(BuildContext context) {
    const textStyle = TextStyle(fontSize: 25);
    const spacerSmall = SizedBox(height: 10);
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('my_application调用ffiplugin'),
        ),
        body: SingleChildScrollView(
          child: Container(
            padding: const EdgeInsets.all(10),
            child: Column(
              children: [
                Text(
                  '同步求和sum(1, 2) = $sumResult',
                  style: textStyle,
                  textAlign: TextAlign.center,
                ),
                spacerSmall,
                Text(
                  '异步求和sum(3, 4) = $sumAsyncResult',
                  style: textStyle,
                  textAlign: TextAlign.center,
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
  

  }

• 效果展示