Instagram-like Android-app in Kotlin (with RxKotlin)

with Asitaka|4 years experience|PHP

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How to create simple Instagram-like Android-app in Kotlin

Kotlin comes from industry, not academia. It solves problems faced by working programmers today. As an example, the type system helps you avoid null pointer exceptions. Research languages tend to just not have null at all, but this is of no use to people working with large codebases and APIs which do.

Overview

Introduction

This tutorial will cover the steps necessary to code a an Instagram like app in Kotlin and Android Studio Canary. You will be guided through all the steps and concepts, starting from setting up the build environment to building a basic app. When you finish the tutorial, you should be able to continue developing a final product.

** I will not be developing an api server for this application

What are the requirements?

Basic knowledge of Android Development, especially the Android Lifecycle
Basic Java or Kotlin knowledge (or both)
An API server (if you wish to deploy in the future)
XML/CSS for styling the application
Desire to learn something new.

What is the target audience?

You want to learn about how instagram works and make a similar application
You want to learn how to write an application in Kotlin
People who want to learn a new language

When are the streaming sessions (streaming schedule)?

Thursday and Sunday at 6:30pm EST

Project Outline

Session 1: Setting-up the Environment

Setting up the programming environment for windows
Setting up the programming environment for mac
Setting up the programming environment for linux

Session 2: Make a basic App with a Recycler view:

Comment out all the extras from our basic template
Add a base frame to main
Load a recycler view fragment into our main frame (with swipe refresh)
Create a loading item
Create an instagram template item

Session 3: Populate a Recyler View with dummy data:

Build a recycler view
Build a delegate
Load dummy data from lorempixel

Session 4: Working with an API

Create data classes
Add retrofit and moshi to our project
Pull data and pass the data into the recyclerview

Session 5: Pull data from the Getty API

add api key to secrets.xml
pull the data from the api in an RXJava observable
Add infinite scroll to the image feed

Session 6: Parcelables - keep the data between orientation changes

Modify models to be parcelables
Add a onSave and onLoad
Add an extension function to parcelables

Session 7: Photos:

Requesting access to photos
Applying zomato filters to photos

Session8: Photos:

Passing the photo to a filter view
Saving the photo

Session9: Photos:

Updating the photo to use content:// instead of file://
Adding filters

Session10: Filters:

Using observables to apply filters to bitmaps

Session11:

Adding Picasso Filters
Extending transformation class
Saving to the gallery

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