What is MethodChannel?
- Flutter course
- Advanced
- Lesson 46/69
- 4 min
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');Practice Create a MethodChannel
Create a MethodChannel with the name 'samples.flutter.dev/battery' and print 'ok'.
Starter code
class MethodChannel {
final String name;
MethodChannel(this.name);
}
void main() {
// MethodChannel oluştur
// 'ok' yazdır
}Sample solution
class MethodChannel {
final String name;
MethodChannel(this.name);
}
void main() {
const channel = MethodChannel('samples.flutter.dev/battery');
print('ok');
}Expected output
ok
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What is the purpose of MethodChannel?
- To run database queries
- To communicate between Dart and native platform code Correct answer
- To carry data between two widgets
- To send HTTP requests
Explanation: MethodChannel acts as a bridge between Dart and native code; it has nothing to do with widget data, HTTP, or databases.
2 Create a MethodChannel
const channel = ____('samples.flutter.dev/battery');const channel = MethodChannel('samples.flutter.dev/battery');Explanation: To create a MethodChannel you call the MethodChannel constructor and pass the channel name as a parameter.
3 MethodChannel parts
| Term | Meaning |
|---|---|
MethodChannel |
Dart-native bridge |
native |
Platform-specific code |
channel |
Communication channel |
'samples.flutter.dev/battery' |
Channel name |