About the talk Haven’t you ever wanted to globally change the appearance of your `EditText`s or the font face of all `TextView`s in your Android application? Themes and styles have always been at the heart of Android development when it comes to UI design. They have been around since API 1 after all and a lot of the Android features are built around them. But do you even know how themes and styles works? What is an attribute? And can you explain the difference between a style, a theme, a text appearance or a theme overlay? If you have never heard of styles and themes or are not entirely sure you can answer the questions above, this presentation is made for you. This talk will dive deep into the Android styling and theming system. You will learn how to leverage it to customize your Android application, reduce duplication in your code and make your styles cleaner, more manageable and more reusable

About Cyril Cyril is Product Engineering Lead at Zenly. Passionate about technology and design, Cyril is an avid lover of Android and a multi-skilled engineer. He is actively involved in mobile communities and shares his passion writing blog posts, creating open source libraries and giving talks. His motto: Do less, but do it insanely great.

About the talk There can be many different reasons for starting a project and for writing code. Not all code we write needs to end up in production - and coding for learning, to build prototypes, or to satisfy your inner curiosity, can be really valuable. In this talk, John will show how he approaches new coding projects, how he breaks down what at first might seem like impossible tasks, and why he loves to code for curiosity.

About John Creator of 'Swift by Sundell' — weekly blog about Swift development.

About the talk Google Assistant is now available on over 500 million devices around the world. It enables you to engage with your new and existing users in completely new ways — through the rich contextual, conversational, and inter-modal experiences. As an Android developer, you can use the same development mechanism that you use for App Actions to create conversational actions to bring your service to the new smart devices. In this talk, you’ll learn how to integrate your Android app with the Google Assistant to reach new users and serve existing ones better. We’ll cover adding conversational functionality to your projects, defining custom grammars, and participating in vertical programs.

About Aygul and Kaan Dr. Aygul Zagidullina is a passionate Actions on Google developer. She is a Director of Social Media at MotaWord. Previously, Aygul worked at Todoist and Google. She holds a PhD in quantum chemistry and prior to Google dedicated 6 years to scientific research at the University of Stuttgart. Aygul is a very active member of the London digital ecosystem and has been involved in many innovative projects. She is a Google Developer Group (GDG)/ Women Techmakers (WTM) London lead, Google Top Contributor (TC)/ Trusted Tester (TT), and UK STEM Ambassador. Kaan is a mobile software engineer at MyDrive Solutions, a Generali company, in London, UK. As an active community builder, he has co-organized a lot of developer events in the UK and Turkey such as DevFests, Android Developer Days’, Android Study Jams. Besides being a Google Developer Group (GDG) London co-organizer, he is a Google Top Contributor (TC) and a Google Local Guide. Kaan is passionate about exploring new technologies and traveling around the world.

About the talk Forget everything you know about APKs, the App Bundle is here! This session takes you through the history of Android app distrubution, including APK internals, app signing and Play improvements that ultimately lead to where we are now. You will learn about the technologies that enabled Google Play Dynamic Delivery using the new bundle format, including for the first time letting developers dynamically load optional modules, containing code and resources, at runtime.

About Wojtek Developer Advocate at Google, based in London, helping Android developers with new framework features, Android Studio and testing. He enjoy finding ways to make apps more usable, mostly through better development patterns and code optimizations.

About the talk How to encrypt, what is a cipher, how to use AES or message authentication. Dive deep into basic cryptography basic primitives. Learn the difference between platforms and languages. Let’s make it a group therapy session. Straight from the CryptoSwift war field (> 5 millions of downloads). Lessons learned, and not learned.

About Marcin After programming for several years, Marcin enjoys working on mobile technologies and cryptography, more than in enterprise business solutions. He has worked on multiple projects with various technologies, currently working on a PDF framework at PSPDFKit. He recently combined his passions, working with CryptoSwift for Apple’s new Swift language. With a head full of ideas, in his spare time, he develops and launches new projects including Online Swift Playground, ObjectivePGP, and contributes himself back to the OSS community

About the talk Developers and designers want the same thing: the best possible product out there. However, cooperation between the two vastly different disciplines is rarely seamless. What can be done to make the dev-design interaction work better? How can we improve the communication and cooperation? In this joint talk, with a developer and a designer, Juhani and Pierluigi will share with you usual pain points from both points of view and explain how to best avoid them. You will also learn how a seamless cooperation can lead into a new wave of very rapid prototyping using Android as the platform. The tools and libraries available for Android designers and developers now allow small teams of two to build complete functional prototypes in just two days. Juhani and Pierluigi will also explore how to best get detailed designs communicated in a form that developers will understand them and how they best get feedback from designers for adding that extra polish to projects and prototypes.

About Juhani & Pierluigi Juhani is an Android enthusiast. Developer. Design fanboy. Founder at Snapp Mobile Germany. Google Developer Expert on Android

About the talk Dependency injection (DI) was introduced as one of the modern best practices at a past WWDC, and is getting popular to make iOS apps maintainable, scalable and testable. To apply DI pattern, a DI container is often used to define a dependency graph to retrieve instances with their dependencies resolved. In this talk, the original author of Swinject, the most popular DI framework for Swift/iOS, will introduce DI pattern for iOS apps. The talk is based on the speaker’s experience developing a production app used by tens of millions of users. The talk covers: - Basic concept and motivation of dependency injection in dependency inversion principle. - Comparison of iOS architectures, e.g. MVC, MVVM and VIPER. - Introduction of a minimum architecture to apply dependency injection. - Practical structure to configure dependency definitions using Swinject Container, Assembly and Assembler. - Unit testing with test doubles and dependency injection.

About Yoichi Yoichi is the original author of Swinject, which is the first and most popular dependency injection framework written in and for Swift. He is an iOS engineer and engineering manager at Mercari, which provides a marketplace app for anyone to buy and sell items in US, UK and Japan.

About the talk This talk is devoted to using Kotlin to share code between Android and iOS. It also covers Kotlin features and evolution making this possible and convenient. Kotlin Multiplatform Programming is a technology for multiplatform programming in Kotlin. It supports combining both common and platform-specific code in a single codebase with proper tooling enabled. Kotlin/Native is a technology for compiling Kotlin code to native binaries. Kotlin code has seamless interoperability with native platform (e.g. iOS) in this case. The speaker will describe how Kotlin/Native works, what is supported and what is not.

About Svyatoslav Svyatoslav Scherbina is a developer interested in programming languages design and implementation. Currently he works as software developer on Kotlin/Native project at JetBrains and appears to be responsible for bridging Kotlin and iOS worlds. Previously he used to work at Excelsior LLC on Excelsior JET project, certified Java SE implementation with AOT compiler.

About the talk Property delegation is pretty new feature in the programming world and most developers use only small amount of possibilities it provides. On the other hand, class delegation is known for decades and it was promoted by big authorities. All it needed was language support, which was introduced in Kotlin. On this session, we are going to dive into possibilities that Kotlin delegation gives. Let’s discover this features and understand its superpowers.

About Marcin Marcin Moskala is an experienced Android developer passionate about Kotlin since its early beta release. He is the creator of Kotlin Academy and author of the book “Android Development with Kotlin”. He is Kotlin evangelist and the main author on the biggest medium publication about Kotlin: blog.kotlin-academy.com. He is also the autor of libraries like ActivityStarter, ArcSeekBar, KotlinAndroidViewBinding and PreferenceHolder. Marcin is active in the programming and open source community and is also passionate about cognitive and data science.

About the talk Google has announced, that they are switching from mobile first to AI first. News are going crazy about AI. Companies, raise hundreds of millions by just mentioning keywords of Artificial Intelligence and Deep Learning. But what does it mean for actual production use-case? Where is the line between the hype and how easy is to apply these technologies? In the talk, we start with basic concepts of Machine Learning, explaining tensors and advantages of Tensorflow, shifting more into the direction of practical examples of how one can apply mentioned technologies without going too deep into mathematics. The talk has a strong focus on how to use Machine Learning in practical ways for mobile apps. Starting with mobile serving based Tensorflow Lite and introducing to seamless integration based on the brand new MLKit.

About Sergii Sergii is Google Developer Expert in Machine Learning. In his free time, he organizes Hacking Machine Learning meetup in Munich, that currently has more than 1300 members and hosts monthly events. Over the weekends he enjoys sharing his knowledge as a conference speaker or open source and machine learning ambassador. In his work time, he works on democratizing fashion with Stylight, one of the biggest fashion communities in the world. Given more than 30 million products live over more than 1000 shops in 17 countries, using machine learning and data science is one of the ways to make Stylight a great place to discover products.

About the talk In early 2018 I ran a survey of the global Kotlin ecosystem. My goal was to learn how developers use and adopt Kotlin - either in work or side projects, or just for playing around, and what are some of the most popular resources for learning it. The survey was a great success, and gained over 2000 responses in total! The results are meant to become a resource for the Kotlin community. Something we can all look at for interesting insights that will also help drive adoption of Kotlin in our teams and organisations. To give you a taster, here’s a few questions I asked in the survey: How big is Android as a proportion of all Kotlin developers Are people happy naming libraries and tooling with K What are the favourite features of the language What kind of DSLs are people building with Kotlin and for what use-cases In my talk will answer all these questions, and more. But be warned, some answers might surprise you.

About Zan Space Cowboy. Speaker. Immigrant. Developer avocado 🥑; Developer turned Evangelist @ Pusher; 🇪🇺 afficionado. Lover of everything hoppy.

About the talk Any app can benefit from machine learning, and by pairing Create ML with Core ML Apple has given us all the tools required to get started. In this presentation you’ll get a brief introduction to these two technologies, followed by a live demo of creating a complete ML-powered app from scratch. Whether you want sentiment analysis, image recognition, or regression analysis, Create ML and Core ML provide a powerful duo that can add functionality to your app in just a few minutes. While there is some mathematics involved, these will all be covered so you won’t need any pre-existing knowledge to get the most from this session.

About Paul Paul is the author of Hacking with Swift, Pro Swift, Swift Design Patterns, Server-Side Swift, Hacking with macOS, Hacking with watchOS, Hacking with tvOS, Swift Coding Challenges, and more. Suffice it to say, he quite likes Swift. And coffee. (But mostly Swift.) (And coffee.)

About the talk Android security is nowhere near where it should be. I have been able to hack and get sensitive information from a few different apps and I’m just an amateur hacker at best. In this session we will explore a number of ways an Android app can be exploited and most importantly methods that we can use to avoid these attacks.

About Marcos Marcos is a developer evangelist at Twilio and a GDE. He serves communities in London and all over Europe. He is passionate about technology and security and spends a great deal of his time building mobile and web apps, and occasionally connecting them to physical devices.

About the talk How to build online swift compiler., using available tools found on stack overflow, a case study of http://online.swiftplayground.run/

About Marcin After programming for several years, Marcin enjoys working on mobile technologies and cryptography, more than in enterprise business solutions. He has worked on multiple projects with various technologies, currently working on a PDF framework at PSPDFKit. He recently combined his passions, working with CryptoSwift for Apple’s new Swift language. With a head full of ideas, in his spare time, he develops and launches new projects including Online Swift Playground, ObjectivePGP, and contributes himself back to the OSS community

About the talk Learn to build for voice first so you can easily surprise and delight your users on hundreds of millions of devices through the Google Assistant. Let’s be honest: it's quite easy to be tempted to take an existing visual-based experience and simply convert it to voice. In this talk, we’ll cover five key ways voice-first development differs from screen-first development. You’ll learn how to create engaging experiences for voice, the next major disruption in computing. By the end of this session, you should have a better understanding of what types of use cases transfer well to voice interactions and why.

About Aygul Dr. Aygul Zagidullina is a passionate Actions on Google developer. She is a Director of Social Media at MotaWord. Previously, Aygul worked at Todoist and Google. She holds a PhD in quantum chemistry and prior to Google dedicated 6 years to scientific research at the University of Stuttgart. Aygul is a very active member of the London digital ecosystem and has been involved in many innovative projects. She is a Google Developer Group (GDG)/ Women Techmakers (WTM) London lead.