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[Interview Project]: An Android Developer Interview Coding Challenge in MVP by edgar-trem

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utopian-io · @edgar-trem · (edited)
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[Interview Project]: An Android Developer Interview Coding Challenge in MVP
Yesterday I got asked to build an Android app from scratch as part of an interview coding challenge. The recruiter asked me to submit the project via GitHub, so I thought I would might as well document it here for anyone interested in the Android developer interview process, and/or anyone looking for tips on their upcoming Interview.

### The Challenge

1. Create a native Android Mobile App with a Side menu and map as home screen. 
2. Take a set of dummy data representing locations on map with latitude and longitude. Show these locations on map when a user opens the app using appropriate marker.
3. Create a button to pin a new location searched on map by a user. 
4. Add this new location to your set of dummy data and it should show up the next time user starts the app. 
5. Use MVP architecture 

### My Approach

The challenge pretty easy, I got it done in a couple of hours. Here's the completed product 
![image](https://raw.githubusercontent.com/edTheGuy00/Parkstash-challenge/master/images/image.png)

**What is MVP?** for those if you that do not know, MVP is basically a design style of writing code. MVP stands for Model View Presenter, and when writing code in MVP, you compartmentalize the code to only perform certain function. 
- Model - consists of all the code that is responsible for fetching and storing data
- View - is all the code the is related to the UI (what you see in the screen)
- Presenter - all the business logic or the brain of the app. 

Here's a pretty diagram of MVP

![mvp](https://cdn-images-1.medium.com/max/1600/1*p2JvbgEir0BusDiiVHMvIA.png)

So here is How it Wrote the app, 
1. We define a Contract, in my case I named it [MainContract](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/MainContract.kt) this is the Glue between the View and the Presenter
2. I created a fragment named [MainFragment](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/MainFragment.kt) this will serve as the view. notice that we have to inherit [MainContract.View](https://github.com/edTheGuy00/Parkstash-challenge/blob/11c8fee77c2ba2c2c262f4e803f7f263249adfc4/app/src/main/java/com/taskail/parkstashproject/MainFragment.kt#L19)
3. [MainActivity](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/MainActivity.kt) will serve as the presenter in this case. Here we need to inherit [MainContract.Presenter](https://github.com/edTheGuy00/Parkstash-challenge/blob/11c8fee77c2ba2c2c262f4e803f7f263249adfc4/app/src/main/java/com/taskail/parkstashproject/MainActivity.kt#L20)
4. Lastly I created the Model as [LocationRepo](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/data/LocationRepo.kt)

The [LocationRepo](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/data/LocationRepo.kt) is actually only in charge of fetching and saving the data into the database. The entire Model aspect of the MVP architecture actually consists of almost all the [data](https://github.com/edTheGuy00/Parkstash-challenge/tree/master/app/src/main/java/com/taskail/parkstashproject/data) directory. In here you will find the creation of the [database](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/data/ParkStashDatabase.kt), the definition of the only [table in the database](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/data/Location.kt) and the [access objects](https://github.com/edTheGuy00/Parkstash-challenge/blob/master/app/src/main/java/com/taskail/parkstashproject/data/LocationDao.kt) for the database. 

Overall this was a pretty fun project to do. 

<br /><hr/><em>Posted on <a href="https://utopian.io/utopian-io/@edgar-trem/interview-project-an-android-developer-interview-coding-challenge-in-mvp">Utopian.io -  Rewarding Open Source Contributors</a></em><hr/>
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@codingdefined ·
$0.02
Thank you for your contribution.

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@edgar-trem · 
Thanks, 

It seems like contributions  can be much more conscience  with the score card, But I would think it's a bit more work for you moderators right?
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@mathemandy · 
Was it timed?  I mean the interview
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@edgar-trem · 
They gave me two days to complete it, I did it in about 5 hours.
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@sweetim · 
lol, thats the boss, You getting the role :) 
whats gonna happen to Mixion ?
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@steemitboard · 
Congratulations @edgar-trem! You have completed some achievement on Steemit and have been rewarded with new badge(s) :

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@utopian-io · 
### Hey @edgar-trem I am @utopian-io. I have just upvoted you!
#### Achievements
- People loved what you did here. GREAT JOB!
- You have less than 500 followers. Just gave you a gift to help you succeed!
- Seems like you contribute quite often. AMAZING!
#### Utopian Witness!
<a href="https://discord.gg/zTrEMqB">Participate on Discord</a>. Lets GROW TOGETHER!
- <a href="https://v2.steemconnect.com/sign/account-witness-vote?witness=utopian-io&approve=1">Vote for my Witness</a>
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