Flutter混合开发：Android与Flutter之间通信详细指南

在Android与Flutter之间进行通信时，可以使用MethodChannel来实现。以下是一个简单的例子：

Android端（Kotlin）:

import io.flutter.embedding.android.FlutterView
import io.flutter.plugin.common.MethodCall
import io.flutter.plugin.common.MethodChannel
 
class MainActivity: AppCompatActivity() {
    private val CHANNEL = "samples.flutter.dev/battery"
 
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        GeneratedPluginRegistrant.registerWith(this)
 
        val flutterView = findViewById<FlutterView>(R.id.flutter_view)
 
        MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
            if (call.method == "getBatteryLevel") {
                val batteryLevel = getBatteryLevel()
                if (batteryLevel != -1) {
                    result.success(batteryLevel)
                } else {
                    result.error("UNAVAILABLE", "Battery level not available", null)
                }
            } else {
                result.notImplemented()
            }
        }
    }
 
    private fun getBatteryLevel(): Int {
        // 实现获取电池电量的逻辑
        return 100 // 示例返回值
    }
}

Flutter端（Dart）:

import 'package:flutter/services.dart';
 
class BatteryLevel {
  static const MethodChannel _channel =
      const MethodChannel('samples.flutter.dev/battery');
 
  static Future<int> get batteryLevel async {
    final int batteryLevel = await _channel.invokeMethod('getBatteryLevel');
    return batteryLevel;
  }
}
 
void main() {
  runApp(MyApp());
}
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Battery Level')),
        body: Center(
          child: FutureBuilder<int>(
            future: BatteryLevel.batteryLevel,
            builder: (context, snapshot) {
              if (snapshot.connectionState == ConnectionState.done) {
                if (snapshot.hasData) {
                  return Text('Battery level at ${snapshot.data}%.');
                } else {
                  return Text('Unable to get battery le