Welcome

to my Blog

I’m writing about software engineering, mainly android developement, leadership and other random stuff. I’m co-host of TheContext Podcast and speaker at conferences. I love football and enjoy hiking.

I’m an Engineering Manager at OneFootball.


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  • Jan 19, 2017
  • 13 min read

Reactive Apps with Model-View-Intent - Part 3: State Reducer

In the previous part we have discussed how to implement a simple screen with the Model-View-Intent pattern with an unidirectional data flow. In this blog post we are going to build a more complex screen with MVI with the help of a state reducer. If you haven’t read part 2 yet, you should read that before continue with this blog post, because there is described how we connect the View via Presenter with the business logic and how data flows unidirectional.

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  • Jan 17, 2017
  • 14 min read

Reactive Apps with Model-View-Intent - Part 2: View and Intent

In the first part we have discussed what a Model actually is, the relation to State and how a well defined Model can solve some common issues in android development. In this blog post we continue our journey towards “Reactive Apps” by introducing the Model-View-Intent pattern to build Reactive Apps.

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  • Jan 09, 2017
  • 15 min read

Reactive Apps with Model-View-Intent - Part 1: Model

Once I have figured out that I have modeled my Model classes wrong all the time, a lot of issues and headache I previously had with some Android platform related topics are gone. Moreover, finally I was able to build Reactive Apps using RxJava and Model-View-Intent (MVI) as I never was able before although the apps I have built so far are reactive too but not on the same level of reactiveness as I’m going to describe in this blog post series.

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  • Oct 13, 2016
  • 7 min read

Why a library developer should use abstract class instead of interface

Use interfaces for java development they said. It will be more flexible they said. Well, that all might be true but for library projects that doesn’t necessarily has to be true as well. In this post I will explain you why I have switched from interface to an abstract class as base class in one of my library projects called AdapterDelegates 3.

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  • May 13, 2016
  • 14 min read

From Prefab House to Lego House

Before joining my current employer I have worked for an app agency and one thing I have noticed is that we were building every app entirely new from scratch even if we were building a similar app for the same customer with similar UI. We hadn’t reusable components. In this blog post I want to share some thoughts and lessons learned while building such reusable components.

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  • Apr 26, 2016
  • 5 min read

Mixins as an alternative to inheritance in Java 8

Starting in Android N Google has added some java 8 language features. One of those features is the ability to add default methods to interfaces. Surprisingly (since java 8 has already been released 2 years ago) I haven’t found good articles describing the advantage of default methods for interfaces: Mixins!

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  • Mar 24, 2016
  • 9 min read

Presenters don't need lifecycle events

I have been asked several times why Presenters in Mosby (MVP library) don’t have lifecycle callback methods like onCreate(Bundle), onResume() etc. Also the awesome guys over at SoundCloud have published a library called LightCycle that helps break logic out of Activity or Fragments into smaller containers bound to the parents Activity’s or Fragment’s lifecycle.

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  • Mar 04, 2016
  • 16 min read

Model-View-Intent on Android

As developers we should always think outside the box. A month ago Artem Zinnatullin and I have discussed some architectural trends on android and on other platforms, like .NET and javascript, in his Podcast The Context. A few days later Christina Lee gave an awesome lightning talk Redux-ing UI Bugs during square’s The Journey of Android Engineers event.

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  • Mar 01, 2016
  • 11 min read

Let Mosby Flow - An alternative to Fragments

The usage of Fragments in Android apps is highly controversial. While some developers love them, others hate them. In this blog post I will give you a short introduction of how to use Mosby 3.0 to build MVP base screens and square’s Flow library as navigation stack replacement. Preface: Usually I use Fragments in my apps and 99% of the time they work well.

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