A Google Play Games Services plugin for flutter

1. add dependencies

   dependencies:
     play_game_service: ^0.2.2

2. import requirements

   import 'package:play_game_service/play_game_service.dart';

3. SignIn

   // set scopeSnapShot=false if you don't want play with snapshots;
   var ret = await PlayGameService.signIn(scopeSnapShot: true);
   if(ret.success){
     if(ret.email != null){
       // you can get user's email from ret.email
     }
   }

4. Save Game Data

   var ret = await PlayGameService.saveSnapShot("HashiTogether", new Uint8List(10), "description");
   if(ret.success){
     // save successful
   }

5. Load Game Data

   var ret = await PlayGameService.signIn(scopeSnapShot: true);
   if (ret.success) {
     var loadResult = await PlayGameService.loadSnapShot("HashiTogether");
     if (loadResult.success) {
       Uint8List data = loadResult.data!;
       // TODO Now you have data, do what you want.
     }
   }

6. Show Leaderboards

   PlayGameService.showLeaderboards();

7. Submit score

   // leaderBoardId is the leaderboard's id which you added in google play console
   PlayGameService.submitScore(leaderBoardId, count);

8. Show Achievement

   PlayGameService.showAchievements();

9. Achievement increment

   // ACHIEVEMENT_ID is the achievement's id which you added in google play console
   PlayGameService.increment(ACHIEVEMENT_ID);