Triviums Mobile App (UPDATE: Show Users)

Repository

https://github.com/princessdharmy/triviums

History

• 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.javato encapsulate both the data and state

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 :

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.

Implementation

• This code snippet fetches all the users in the database - Firestore in the LeaderboardRepository.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

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
• Pull Request
• Apk file
• Playstore

Roadmap

• Leaderboard implementation:
  Display all users
  Add users to compete
  Remove users from competition
• Display of users' quiz achievements