- DroidCon Berlin 2018 was a 3 day conference with over 1200 attendees celebrating its 10th anniversary that focused on Android, Kotlin, machine learning, Flutter, augmented reality, and business applications - Sessions covered topics like Kotlin language improvements, Gradle performance, using Android in business, reactive programming with RxJava, and commercial tools from companies like Google and Huawei - A Global Community Platform was introduced to share videos, tutorials, and presentations from DroidCon year-round in an "online DroidCon" experience

1. DROIDCON
BERLIN 2018
Bartosz Kosarzycki
@bkosarzycki
Michał Radtke
Jun 25-27, 2018

3. Summary 2018
- 1200+ Attendees
- 10th anniversary (started with 200 devs in 2009)
- 3 days, 5 tracks, 100+ sessions
- Android, Kotlin, Machine Learning, Flutter, AI, VR,
AR, Android-For-Business, Chromebooks,
Tensor-Flow, SAP and more
- Introduced Global Community Platform

5. Our summary
- ⅕ - Kotlin as a language, improvements, libraries, DSL
- ⅕ - Gradle performance improvements / tweaks
- ⅕ - Android for business / Chromebooks
- ⅕ - RxJava must die, get rid of Java style in Kotlin
- ⅕ - Commercial e.g. Huawei AI, Google Cloud etc.

6. Global Community
Platform - DroidCon
- Knowledge exchange platform
- “Online DroidCon”
- Videos/Tutorials/Presentations
- InVision project (not implemented yet)

9. Blurring the line between native and the web
- History: J2ObjC, GWT -> multi-platform frameworks
- Based on Kotlin
- Runs on Android/iOS/Linux/MacOS/Chromebook/Win
- Uses kotlin-native - platform independent code
- Chromebooks: run android apps and linux native apps (Android Studio)
- Webapps: background sync api, web notifications, getUserMedia (mic, cam), webVR,
webBluetooth, webUSB
Jake Wharthon

12. HERDING LLAMAS IN YOUR FLAT - A DEEP DIVE
INTO ARCORE AND SCENEFORM
- http://poly.google.com/ - Google polygon database
- ArFragment, ArSceneView
- CollisionDetection -> resolveOverlap()
- Renderable -> casting shadows
- SFAs Polygons, file formats
- Emulator support
- AndroidStudio SceneForm plugin
Steven Mohr

13. link
link
link
link
link
link
link
link

14. OLGA NAGATOVA - Polygon Artist
- http://www.nabatova.ca/ - Personal Website

15. AUGMENTED REALITY FOR EVERYONE,
EVERYWHERE WITH ARCORE
- ARCore utilization
Till Krempel

21. Gradle performance
- Min SDK 21 - 30% faster build
- Better hardware
- Project modularisation (module per feature)
- Parallel gradle task execution
- Offline gradle builds

28. BUILD A REACTIVE FLUTTER APP!
- How to write Reactive Flutter Apps
- Hired by google to write flutter cookbook
- layered, modular, testable, SOLID
- StatefulWidget
Brian Egan
Groupon - Showcase app
Tomek Polanski
- How he convinced Groupon to write Flutter app
- Started from scratch
- Success story

30. +
Chrome OS apps

31. ANDROID ENTERPRISE ON CHROME OS
- Target API 23+
- Prepare Android apps for Chromebooks
- Touchpad gestures
- Be ready for keyboard/mouse support (keyboard shortcuts, arrows, mouse right click)
- Stylus support
- Dynamic window management (resizing)
- ChromeOS emulator
- AndroidStudio for ChromeOS (works only
PixelBooks as of now)
- https://twitter.com/KennethFSWE/status/953766120502292480
- medium
Kenneth Ford

32. VIDEO: LINK

34. STATE OF KOTLIN LANG
- THE STATE OF THE KOTLIN ECOSYSTEM
Zan Markan

35. STATE OF KOTLIN LANG

36. SHARE CODE IN KOTLIN
- Alternative to C++
- Alternative to Xamarin common code
- Android / iOS
- “(CODE) SHARING IS CARING”
- inject platform specific logic into shared code
Tobias Heine Said Tahsin Dane

41. Rx… Does it need to die?
- Developers tend to use it even for simple event handling (e.g. on clicks) tasks or API request
- Rx should be used only for handling complex streams of data
- Rx introduces new kinds of issues if you don’t use it daily
- You can easily use coroutines instead of Rx
- Created in times of Java 6;
not-needed while Java 8/Kotlin is available
- proactively ask the question:
is this a reactive scenario?
- It’s harder to write unit tests when you use RX
If possible, use native tools, like
Coroutines in Kotlin, LiveData, etc.

42. Christof Vollrath - notes
link

45. GRAPHQL
- Apollo library - caching graphQL client for mobile
- developed by Facebook
- like SQL for data
- GraphSQL vs REST - you get only what you want
- single endpoint: /graphql
- Presentation about UFO sightings ;)
CHEATSHEET - link
Annyce Davis

51. KOIN
- Kotlin allows us to use DSL instead of Annotation Processors
- Annotation Processors are slow
- Annotation Processors (as of now) kill Gradle incremental compilation
- KOIN vs Dagger 2
Danny Preussler

56. FONTS, EMOJI AND TEXT USING SUPPORT
LIBRARIES
- Easily import fonts
- EmojiAppCompat usage
- EmojiTextViewHelper for customs views
- Downloadable fonts (from Google resources,
can be downloaded during app installation)
- TextView auto-sizing (width and height shouldn’t be
wrap_content)
Anita Singh

61. TENSOR FLOW - on mobile
- Machine Learning APIs - Google // IBM // Microsoft
- Deep neural network
- pix2pix tool
- cat model -> 680 MB -> SO OPTIMISE!
- Draw to pix sample app
Attila Blenesi

62. VIDEO: LINK

68. MOBIUS - LOOPY UI
- State management library
- Kotlin data classes represent events
- Events, inputs, Effects
- Presentation
Petter Mahlen

70. Kirin 970 first introduced a dedicated Neural Processing Unit (NPU) on the mobile AI computing platform

72. BUILDING A DECENTRALIZED
APP ON ANDROID
- “OPPORTUNITIES IN THE DECENTRALIZED APPS WORLD”
- you're told who the user is
- only the user can decrypt the data
- decentralized app: authentication & encryption & storage
- S3-like storage
- keys generated on device
- GDPR world in European Union
- Facebook “leaks”
Friedger Müffke
APPLICATION STORE:
https://app.co/

75. Data Binding on Android
Ash Davies

78. GITLAB - THE BEST APPS ARE BUILT IN
PYJAMA-PANTS
- GitLab team around the world
- Run a “daily”, not project related, to talk about personal life and get to know one another
- They run a blog - link
Job van der Voort
HOW TO RUN A COMPANY GUIDE:
HANDBOOK
Onboarding - link
Hiring - link
Spending company money - link

81. Fun

85. Links / References
- DroidCon Berlin YouTube channel - link
- DroidCon official website - link
- https://twitter.com/cvollrath
- Machine Learning - link, link, link
- https://medium.com/@sabag.ronen
- https://twitter.com/danlowlows/status/858754840419196929

86. QUESTIONS?
@bkosarzycki