Annyce Davis

Information & Communications Technology

Android Kotlin Java Software Development

Amsterdam, North Holland, Netherlands

Annyce Davis

Google Developer Expert, Online Video Instructor

Annyce is an Android and Kotlin Google Developer Expert. She has spent the past 9+ years developing applications for the Android ecosystem across multiple form factors. She is also an international conference speaker and author, sharing her knowledge of Android and Kotlin development with others!

Current sessions

GraphQL powered by Kotlin

Description: GraphQL is a query language for your API. This allows you to interact with your existing web services and databases in a new way. Instead of relying on a predetermined output structure from your API, you can "query" it and choose only the fields that you're interested in. In this talk, learn what GraphQL is all about and how you can take advantage of it in your applications.

A few key GraphQL terms we'll cover are:
* Fields/Types
* Variables
* Queries/Mutations

We're going to explore how you can create a GraphQL Server with a stack written entirely in Kotlin. Then we'll take a look at how you can integrate the Apollo Client library inside of a Kotlin-powered Android application. GraphQL isn't going away, so here's your chance to get a grip on this exciting technology!

RxJava with Kotlin in Baby Steps

Reactive Programming with RxJava has widely been adopted by both backend services and Android applications alike. Yet, the steep learning curve leaves many developers hesitant about adding it to their own Software tool belt. I was one such developer. Over the past two years, I’ve watched countless videos, read numerous blog posts and attended several conference talks on the subject. Yet, I often left each experience feeling only slightly more knowledgeable, but not quite empowered to start using RxJava in my apps. That’s not going to happen today!

In this talk, we’re going to cover the bare minimum concepts you need to grok, in order to start using RxJava today. In particular, we’re going to focus on:
* The 3 O’s: Observable, Observer and Operator
* The most common Operators: map(), flatMap(), and filter()
* Understanding those Marble Diagrams
* How Kotlin helps to simplify the code

Reactive Programming is not going away any time soon. It’s a powerful way to create asynchronous, event-based applications. It allows developers the ability to craft applications that can easily combine multiple network calls, gracefully handle failures, all while providing a snappy user experience. I want everyone to feel comfortable with the basic concepts of RxJava. Today can be your first step...