Android implementation

Write plugin methods on the Android side.

Android implementation

On the Android side, a plugin is a Kotlin class implementing the FlutterPlugin interface. The onMethodCall method catches incoming MethodCalls from Dart and replies.

class MyPluginAndroid: FlutterPlugin, MethodCallHandler {
  override fun onMethodCall(call: MethodCall, result: Result) {
    if (call.method == "getVersion") {
      result.success("1.0")
    } else {
      result.notImplemented()
    }
  }
}

Kotlin and MethodCall

A plugin written in Kotlin implements the FlutterPlugin and MethodCallHandler interfaces. MethodCall.method gives the call name and MethodCall.argument gives the parameters. Result.success returns the reply to Dart.

Exercise AndroidPlugin simulation

Define a Dart class named AndroidPlugin. Its onMethodCall(String method) method returns a String: '1.0' if method == 'getVersion', otherwise 'unknown'. In main, create an AndroidPlugin instance and print the result of onMethodCall('getVersion').

Show example solution

class AndroidPlugin {
  String onMethodCall(String method) {
    if (method == 'getVersion') {
      return '1.0';
    }
    return 'unknown';
  }
}

void main() {
  final plugin = AndroidPlugin();
  print(plugin.onMethodCall('getVersion'));
}

Test yourself

Which method catches calls from Dart on the Android side?
- build
- onCreate
- onMethodCall
- onClick
Show answer

onMethodCall — The onMethodCall method of the MethodCallHandler interface receives MethodCalls from Dart; build is for widgets, onCreate for activities, and onClick for view events.

result.success call

result.____("1.0");

Show answer

result.success("1.0");

Android implementation matches

Android

Mobile platform
MethodCall

Call from Dart
Kotlin

Android programming language
onMethodCall

Call capture

Next lesson: iOS implementation

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies