### Repository
https://github.com/princessdharmy/triviums

### History
- [Triviums Mobile App](https://steemit.com/utopian-io/@princessdharmy/triviums-mobile-app)

## Fixes
One of the major problems Android Developers encounter is *App Crash* with some Exceptions. In order to tackle this problem, here is my implementation:
- Firstly, I added a NetworkBoundResource class `FirestoreResultResponse.java`to encapsulate both the data and state
```Java
public class FirestoreResultResponse {

    Map<String, Object> data;
    String error;

    public FirestoreResultResponse() {
    }

    public FirestoreResultResponse(Map<String, Object> data, String error) {
        this.data = data;
        this.error = error;
    }
}
```
- Secondly, I had some issues while fetching data from Firestore; once there is a bad internet connection, the app crashes. So, in order to avoid the *FirebaseFirestoreException*, I used a try-catch in the `StageRepository.java` class :
```Java
private void fetchProgress(String categoryName, ProgressCallback callback) {
        ...
        docRef.get().addOnCompleteListener(task -> {
            if (task.isSuccessful()) {
            }
            try {
                callback.onCallback(new FirestoreResultResponse(task.getResult().getData(), null));
            } catch (Exception e) {
                if (e instanceof FirebaseFirestoreException) {
                    callback.onCallback(new FirestoreResultResponse(null, e.getLocalizedMessage()));
                }
                e.printStackTrace();
            }
        })
                .addOnFailureListener(error -> {
                    callback.onCallback(new FirestoreResultResponse(null, error.toString()));
                });

    }
```

## New Features
- Show Users
As stated in the roadmap of my previous post, it's somewhat interesting to know how many people are playing the game you are involved in. So, I decided to get and display all users that are using the app or playing the game.

<center>![](https://cdn.steemitimages.com/DQme93ndHemqVadUkezp7nUNE1uS3SZCzzDacwyTD4t1YCj/image.png)</center>

*Implementation*
- This code snippet fetches all the users in the database - Firestore in the `LeaderboardRepository.java`
```Java
private void fetchUsers(UserCallback callback){

        CollectionReference collection = firestore.collection("users");

        collection.get().addOnCompleteListener(task -> {
            if (task.isSuccessful()) {
                document = task.getResult().getDocuments();
            }
            try {
                callback.onCallback(document);
            } catch (Exception e) {
                if (e instanceof FirebaseFirestoreException) {

                }
                e.printStackTrace();
            }
        })
                .addOnFailureListener(error -> {

                });
    }
```

- The `LeaderboardFragment.java` class gets the user data and display
```Java
public void getUsers() {
        viewModel.getUsers().observe(getViewLifecycleOwner(), response -> {
            binding.loader.setVisibility(View.GONE);
            binding.peopleRecyclerview.setVisibility(View.VISIBLE);
            if (response != null) {
                adapter.updateData(response);
            }
        });

    }
```

## Important resources
- [Github Repo](https://github.com/princessdharmy/triviums)
- [Pull Request](https://github.com/princessdharmy/triviums/pull/16)
- [Apk file](https://github.com/princessdharmy/triviums/releases/tag/1.01)
- [Playstore](https://play.google.com/store/apps/details?id=com.app.horizon)

## Roadmap
- Leaderboard implementation:
~~Display all users~~
  Add users to compete
  Remove users from competition
- Display of users' quiz achievements