MethodChannel registration

A plugin starts on the Dart side with a registerWith method. It creates a MethodChannel and captures incoming native calls with setMethodCallHandler. The plugin is registered automatically when the app launches.

class MyPlugin {
  static const _channel = MethodChannel('my_plugin');

  static void registerWith() {
    _channel.setMethodCallHandler(_handle);
  }

  static Future<dynamic> _handle(MethodCall call) async {
    return 'ok';
  }
}

setMethodCallHandler

setMethodCallHandler catches incoming MethodCall messages from native. The handler branches on the call's method name and returns a result. This is the plugin's Dart-native bridge.

Exercise Define a plugin with registerWith

Define MyPlugin: static const _channel = MethodChannel('my_plugin'), a static void registerWith() method that calls _channel.setMethodCallHandler(_handle), and a static Future<dynamic> _handle(MethodCall call) async => 'ok'. In main, print 'kaydedildi'.

Show example solution

import 'package:flutter/services.dart';

class MyPlugin {
  static const _channel = MethodChannel('my_plugin');

  static void registerWith() {
    _channel.setMethodCallHandler(_handle);
  }

  static Future<dynamic> _handle(MethodCall call) async => 'ok';
}

void main() {
  print('kaydedildi');
}

Test yourself

What does the registerWith method do?
- Opens a database
- Starts the app
- Draws the widget tree
- Creates a MethodChannel and registers a call listener
Show answer

Creates a MethodChannel and registers a call listener — registerWith sets up the MethodChannel and assigns the handler that listens to incoming native calls via setMethodCallHandler.

setMethodCallHandler call

_channel.____(_handle);

Show answer

_channel.setMethodCallHandler(_handle);

MethodChannel registration matches

registerWith

Plugin registration
MethodChannel

Call channel
plugin

Native-bridged package
setMethodCallHandler

Call listener

Next lesson: Android implementation

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