我可以从 Dart 调用 Kotlin 函数吗

Question

使用 Flutter，kotlin/swift 函数可以通过以下方式调用：

file.dart:

static const platform = const MethodChannel('my.test.flutterapp/battery');
final int result = await platform.invokeMethod('getBatteryLevel');

file.kt:

private val CHANNEL = "my.test.flutterapp/battery"
MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
          if (call.method == "getBatteryLevel") {
              ...
          } else {
              result.notImplemented()
          }
      }

是否有类似于从标准 Dart 应用调用 Kotlin 函数的东西，例如 Dart 控制台应用！

Answer 1

https://flutter.io/developing-packages/

Plugin packages: A specialized Dart package which contain an API written in Dart code combined with a platform-specific implementation for Android (using Java or Kotlin), and/or for iOS (using ObjC or Swift). A concrete example is the battery plugin package.

...

flutter create --template=plugin -i swift -a kotlin hello

Answer 2

对于 VM，可用的机制是基本 OS 操作和本机扩展。

我的意思是 OS 操作，您可以启动一个单独的进程并与其交互，使用文件或网络堆栈。这可能不像您正在寻找的那样精细。

本机扩展允许您调用 C 或 C++ 代码。我对 kotlin 的了解还不够，不知道您是否可以轻松地将功能公开给 C/C++。如果可能的话，这将为您提供最紧密的集成。

https://www.dartlang.org/articles/dart-vm/native-extensions

Answer 3

您可以看到这个项目：Full Sample

在安卓中：

class MainActivity: FlutterActivity() {
    private val DATA_CHANNEL = "app.channel.shared.data"
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
        MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), DATA_CHANNEL).setMethodCallHandler { call, result ->
            if (call.method!!.contentEquals("getSharedText")) {
                result.success("Shared Text")
            } 
        }
    }
}

在飞镖中：

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() {
   WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _MyAppState();
  }
}

class _MyAppState extends State<MyApp> {

  static const platform = const MethodChannel('app.channel.shared.data');
  String dataShared = "No Data";

@override
  void initState() {
    super.initState();
    getSharedText();
  }

  getSharedText() async {
    var sharedData = await platform.invokeMethod("getSharedText");
    if (sharedData != null) {
      setState(() {
        dataShared = sharedData;
      });
    }
  }
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home:Scaffold(body: Center(child: Text(dataShared))) 
    );
  }
}

我可以从 Dart 调用 Kotlin 函数吗

Can I call Kotlin function from Dart

android

dart

kotlin

flutter

flutter-channel