What is MethodChannel?

Bridge Dart to native with MethodChannel.

What is MethodChannel?

MethodChannel is a bridge used to communicate between Dart code and platform-specific native code (Kotlin/Java on Android, Swift/Objective-C on iOS). The channel name must be the same on both sides; messages are sent and received through this name.

const channel = MethodChannel('samples.flutter.dev/battery');

Channel name

Each MethodChannel is created with a unique name. The same name is used on both the Dart side and the native side. It is usually written in a reverse domain format, for example samples.flutter.dev/battery. If the name differs, messages do not reach the other side.

const channel = MethodChannel('samples.flutter.dev/battery');

Exercise Create a MethodChannel

Create a MethodChannel with the name 'samples.flutter.dev/battery' and print 'ok'.

Show example solution

class MethodChannel {
  final String name;
  MethodChannel(this.name);
}

void main() {
  const channel = MethodChannel('samples.flutter.dev/battery');
  print('ok');
}

Test yourself

What is the purpose of MethodChannel?
- To run database queries
- To communicate between Dart and native platform code
- To carry data between two widgets
- To send HTTP requests
Show answer

To communicate between Dart and native platform code — MethodChannel acts as a bridge between Dart and native code; it has nothing to do with widget data, HTTP, or databases.

Create a MethodChannel

const channel = ____('samples.flutter.dev/battery');

Show answer

const channel = MethodChannel('samples.flutter.dev/battery');

MethodChannel parts

MethodChannel

Dart-native bridge
native

Platform-specific code
channel

Communication channel
'samples.flutter.dev/battery'

Channel name

Next lesson: invokeMethod

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