Quizzify

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Quizzify - Play unlimited quizzes with your friends for free🔥. Quizzify is built using Kotlin and follows all modern android Development practices and hence is a good learning resource for beginners

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![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/banner/quizzify-banner.png)

# **Quizzify**

**Quizzify** is an app in which we can play unlimited quizzes with our friends for free. Gain some more general knowledge while having fun with friends.

# Video Introduction 📹

This is a small introduction video about Quizzify.

[![Youtube](https://img.youtube.com/vi/rD2-MplbPBU/0.jpg)](https://www.youtube.com/watch?v=rD2-MplbPBU)

# Blog ✍

To know more about how I build this project, read my article on https://vaibhav2002.hashnode.dev/quizzify-play-unlimited-quizzes-with-your-friends-for-free

# Application Install

***You can Install and test latest Quizzify app from below 👇***

[![Quizzify](https://img.shields.io/badge/Quizzify✅-APK-red.svg?style=for-the-badge&logo=android)](https://github.com/Vaibhav2002/Quizzify/releases/tag/v1.0.0)

## Setup
- Clone the repository on your machine.
- Create project in Firebase, enable authentication (email and Google Auth)  and download google-services.json and paste in the app folder.
- Sign up hasura, connect database and do the following:

Open secrets.xml and google web client url for Firebase google auth

```xml

<string name="web_client_id"></string>
```

Open GraphQLSecrets.kt in util package and add your Hasura credentials

```kotlin
//Add your hasura url here
const val HASURA_URL = ""

//Add your hasura websocket url here (same as hasura url but with wss in place of https)
const val HASURA_WEB_SOCKET_URL = ""

//Add your hasura secret key here
const val SECRET_KEY = ""
```

## About

It uses Firebase and Hasura as its backend. It uses Firebase for email based auth and Google auth and Hasura as GraphQL Api to access the database.

- Fully functionable. 
- Clean and Simple Material UI.
- Best and Clean Code Quality following Modern Android Development.

### App Features

- **Onboardng** - Quizzify has a beautiful user onboarding process.
- **User Authentication** - Supports email based as well as Google authentication
- **Home** - Home screen shows the top 5 popular community quizzes, option to start an Instant quiz and to join an exisiting quiz game using invite code.
- **Communtiy** - Shows list of all community made quizzes with option to search and filter based on category. It also allows user to create a new community quiz.
- **Create Quiz** - Users can create quizzes and contribute to the Quizzify community.
- **Favourites** - It list all the quizzes the user has marked as favourite.
- **Profile** - Shows user's profile.
- **About** - Shows information about the app like its version number and more.
- **Quiz Detail** - Shows details of the quiz select and option to start game with friends as well as solo.
- **Game Screen** - Screen where user plays the quiz in real-time with their friends

### Insights into the app 🔎

![Quizzify - slides.gif](https://cdn.hashnode.com/res/hashnode/image/upload/v1647693160293/_0ttFtYYA.gif)

**Quizzify** has a sleek, modern looking minimalistic UI which makes it easy for people of every age group to use. 🔥

![Untitled design.gif](https://cdn.hashnode.com/res/hashnode/image/upload/v1647693198971/kw6umv442.gif)

**Quizzify** has a easy and simple user onboarding process. 😁

![Untitled design (1).gif](https://cdn.hashnode.com/res/hashnode/image/upload/v1647693225605/_BGxAc1EX.gif)

**Quizzify** uses Firebase for authentication. It supports email-based authentication as well as Google authentication with upcoming support for Facebook auth.

![Untitled design (2).gif](https://cdn.hashnode.com/res/hashnode/image/upload/v1647693216108/kpEIF8CVx.gif)

Select whatever quiz you want to play and have fun time with your friends and gain some more general knowledge while playing.

![Untitled design (3).gif](https://cdn.hashnode.com/res/hashnode/image/upload/v1647693273748/tCaskC2u2.gif)

Play quizzes in realtime with friends with live rank and score tracking and enjoy a simple and easy game experience.

![Untitled design (4).gif](https://cdn.hashnode.com/res/hashnode/image/upload/v1647693291275/TgxISULu6.gif)

You can even create quizzes of your own and play with friends. So go on, create quizzes of your own and contribute to the Quizzify community.

## 📸 Screenshots

|||||
|:----------------------------------------:|:-----------------------------------------:|:-----------------------------------------: |:-----------------------------------------: |
| ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/onboarding-1.jpg) | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/onboarding-2.jpg) | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/onboarding-3.jpg) | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/profile.jpg) |
| ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/getting-started.jpg)  | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/login.jpg) | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/register.jpg)    | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/avatar.jpg) |
| ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/home.jpg) | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/community.jpg)    | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/favourites.jpg)      | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/create-quiz.jpg) |
| ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/create-question.jpg)  |    ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/quiz-detail.jpg)    | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/game.jpg)        | ![](https://raw.githubusercontent.com/Vaibhav2002/Quizzify/main/media/screenshots/finish.jpg) |

### Technical details

- Quizzify uses Firebase for user authentication, it supports email based authentication and Google authentication
- Quizzify uses Hasura Cloud's PostgreSQL as it's primary database.
- Quizzify uses Hasura's GraphQL API to access the database and is much easier to work with compared to a REST interface.
- Quizzify has full offline support, it uses Android's ROOM database for caching all data offline.
- Quizzify is made using Kotlin and following Modern Android Development practices.
- Quizzify uses Kotlin Coroutines and Flow to handle all asynchronous tasks.
- Quizzify uses all Jetpack libraries and follows MVVM architecture. It also has a G.O.A.T rating in Android's  M.A.D scorecard.
- Quizzify's code follows all the best practices and software development principles like SOLID which make it a very good learning resource for beginners as well as for people looking to improve thier software design skills.
- Quizzify's code is properly linted using Ktlint.

![summary.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1647777105663/Ua8fDcln2.png)

## Built With 🛠
- [Kotlin](https://kotlinlang.org/) - First class and official programming language for Android development.
- [Coroutines](https://kotlinlang.org/docs/reference/coroutines-overview.html) - For asynchronous and more..
- [Flow](https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/) - A cold asynchronous data stream that sequentially emits values and completes normally or with an exception.
 - [StateFlow](https://developer.android.com/kotlin/flow/stateflow-and-sharedflow) - StateFlow is a state-holder observable flow that emits the current and new state updates to its collectors.
 - [SharedFlow](https://developer.android.com/kotlin/flow/stateflow-and-sharedflow) - A SharedFlow is a highly-configurable generalization of StateFlow.
- [Android Architecture Components](https://developer.android.com/topic/libraries/architecture) - Collection of libraries that help you design robust, testable, and maintainable apps.
  - [ViewModel](https://developer.android.com/topic/libraries/architecture/viewmodel) - Stores UI-related data that isn't destroyed on UI changes. 
  - [ViewBinding](https://developer.android.com/topic/libraries/view-binding) - Generates a binding class for each XML layout file present in that module and allows you to more easily write code that interacts with views.
  - [DataBinding](https://developer.android.com/topic/libraries/data-binding) - Binds data directly into XML layouts
  - [Room](https://developer.android.com/training/data-storage/room) - Room is an android library which is an ORM which wraps android's native SQLite database
  - [DataStore](https://developer.android.com/topic/libraries/architecture/datastore) - Jetpack DataStore is a data storage solution that allows you to store key-value pairs or typed objects with protocol buffers.
- [Dependency Injection](https://developer.android.com/training/dependency-injection) - 
  - [Hilt-Dagger](https://dagger.dev/hilt/) - Standard library to incorporate Dagger dependency injection into an Android application.
  - [Hilt-ViewModel](https://developer.android.com/training/dependency-injection/hilt-jetpack) - DI for injecting `ViewModel`.
- Backend
  - [Firebase](https://firebase.google.com)
    - Firebase Auth - To support email based authentication and Google authentication
  - [Hasura](https://hasura.io) -  Blazing fast API performance, that’s remarkably easy to scale
- [GSON](https://github.com/google/gson) - A modern JSON library for Kotlin and Java.
- [Apollo Kotlin](https://github.com/apollographql/apollo-kotlin) - A strongly-typed, caching GraphQL client for the JVM, Android, and Kotlin multiplatform.
- [Timber](https://github.com/JakeWharton/timber) - A simple logging library for android.
- [Retrofit](https://square.github.io/retrofit/) - A type-safe HTTP client for Android and Java.
- [GSON Converter](https://github.com/square/retrofit/tree/master/retrofit-converters/gson) - A Converter which uses Moshi for serialization to and from JSON.
- [Coil](https://github.com/coil-kt/coil) - An image loading library for Android backed by Kotlin Coroutines.
- [Material Components for Android](https://github.com/material-components/material-components-android) - Modular and customizable Material Design UI components for Android.

# Package Structure
    
    dev.vaibhav.quizzify    # Root Package
    .
    ├── data                # For data handling.
    |   ├── local           # Room DB, and its related classes
    |   ├── remote          # Firebase, Hasura and their datasource implementation
    │   ├── model           # Model data classes and mapper classes, both remote and local entities
    │   └── repo            # Single source of data.
    |
    ├── di                  # Dependency Injection             
    │   └── module          # DI Modules
    |
    ├── ui                  # UI/View layer
    |   ├── adapters        # All Adapters, viewholder and diffUtils for recyclerViews
    |   ├── screens         # All App Screens 
    |   └── usecases        # Use-case classes
    |
    └── utils               # Utility Classes / Kotlin extensions

## Architecture
This app uses [***MVVM (Model View View-Model)***](https://developer.android.com/jetpack/docs/guide#recommended-app-arch) architecture.

![](https://developer.android.com/topic/libraries/architecture/images/final-architecture.png)

---

## If you like my projects and want to support me to build more cool open source projects
  
[!["Buy Me A Coffee"](https://www.buymeacoffee.com/assets/img/custom_images/yellow_img.png)](https://www.buymeacoffee.com/VaibhavJaiswal)
---

## Contact
If you need any help, you can connect with me.

Visit:- [Vaibhav Jaiswal](https://vaibhavjaiswal.vercel.app/#/)

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