Carl-Emil Kjellstrand, Author at blog.

A picture on the wall

Post published:May 3, 2018
Post Author:Carl-Emil Kjellstrand
Post Category:Art
Post Comments:0 Comments

When I decided to leave jayway I wanted to leave something behind, I opted for a picture on the wall of some of my colleagues. Unfortunately I didn't manage to…

Retrofit and auto relogin on a 401 response

Post published:December 7, 2016
Post Author:Carl-Emil Kjellstrand
Post Category:Other
Post Comments:2 Comments

One day while sitting at my desk minding my own code I suddenly found myself under siege by a evil api that only allowed my Set-Cookie header to live for…

Input validation in Android

Post published:November 30, 2016
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:2 Comments

I was trying to enforce a input format and then validate the input data before submitting it in a post to our api. In the code samples below I'm using…

Droidcon 2016 in London

Post published:November 15, 2016
Post Author:Carl-Emil Kjellstrand
Post Category:Android / Events
Post Comments:0 Comments

Bringing in names like Noah Falstein, Chet Haase and Nick Butcher I knew I was in for a treat going to Droidcon in London. Just a week before going to…

RxJava, Retrofit and Databindings on Android

Post published:October 6, 2016
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:2 Comments

In this post I will showcase how you can combine RxJava, Retrofit and Android Databindings to do a simple lookup of country from a country code. The goal here is…

RxJava and Android examples

Post published:September 26, 2016
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:2 Comments

Some simple examples of what you can do with RxJava in Android. We will assume that our examples lives in the onCreate method of an Activity in a Android app…

RecyclerView and Databinding

Post published:December 8, 2015
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:10 Comments

The new DataBinding api is pretty easy to use for most simple bindings. When binding to a view that lives in a RecyclerView or other Adapter dependent View you need…

Pros and Cons of some Android frameworks

Post published:March 4, 2015
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:3 Comments

This post is a summary of first impressions of a few android related frameworks that we (the Android team at Jayway) tried out during a competences session recently. Spring for…

Android and Renderscript intrinsics

Post published:October 1, 2014
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:2 Comments

Intrinsics are renderscripts shipped with the platform, designed for some common image processing tasks. I will use an example from a real application where we wanted a few different things to…

Renderscript on Android – basics

Post published:February 11, 2014
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:0 Comments

With Renderscript for Android there are three parts, two that you need to implement yourself, one in Java and one in c99, and then there is a generated api that…

ViewHolder vs HolderView

Post published:November 6, 2013
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:7 Comments

Adapters and recycling The reason for having a ViewHolder or HolderView is to improve performance of AdapterViews. Adapters used by AdapterViews recycles the views that the AdapterView is using to…

Image caching with volley

Post published:October 4, 2013
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:3 Comments

This post is outdated and I urge you to go have a look at the official google training material instead. When using Volley you will run into the common problem of trying to cache…

Debugging a sqlite database on you android device.

Post published:September 7, 2013
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:8 Comments

I found this tool, aSqliteManager. It's not the only tool/app of it's kind, there are a few similar looking tools. It's basically a database browser that runs on you android device. So what use…

Volley, networking for android.

Post published:August 20, 2013
Post Author:Carl-Emil Kjellstrand
Post Category:Android
Post Comments:12 Comments

This post is outdated and I urge you to go have a look at the official google training material instead. Most projects I have worked on needed some sort of network engine, and…