increment method

@override Future<String?> increment({ required Achievement achievement, })

Increment an achievement. Achievement takes two parameters: androidID the achievement id for android. steps If the achievement is of the incremental type you can use this method to increment the steps.

• only for Android (see https://developers.google.com/games/services/android/achievements#unlocking_achievements).

Implementation

@override
Future<String?> increment({required Achievement achievement}) async {
  return await _channel.invokeMethod("increment", {
    "achievementID": achievement.id,
    "steps": achievement.steps,
  });
}