Droidcon Summary 2021

1. Insert date here
Droidcon 2021
summary
@bkosarzycki

2. Droidcon Berlin 2021
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3. Women in Computer Science
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4. Women in Computer Science
Margaret Hamilton
She was director of the Software Engineering Division of the MIT Instrumentation Laboratory, which developed on-board
flight software for NASA's Apollo program.
Kathleen Booth
Kathleen Booth wrote the first assembly language and designed the assembler and autocode for the first computer systems
at Birkbeck College, University of London
Barbara Liskov
Liskov has led many significant projects, including the Venus operating system, a small, low-cost timesharing system; the
design and implementation of CLU; The syntax of CLU was based on ALGOL, Argus, the first high-level language to support
implementation of distributed programs and to demonstrate the technique of promise pipelining; and Thor, an
object-oriented database system.
Ada Lovelace
Methematician. Ada Lovelace emphasised the difference between the Analytical Engine and previous calculating machines,
particularly its ability to be programmed to solve problems of any complexity
Grace Hopper
Hopper's belief that programs should be written in a language that was close to English (rather than in machine code or in
languages close to machine code, such as assembly languages) was captured in the new business language, and COBOL
went on to be the most ubiquitous business language to date.
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5. 5
Droidcon
superstar Chet Haase

6. 6

7. build
cache
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8. Gradle profile
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9. Gradle doctor
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Nelson Osacky, Soundcloud -

10. Gradle doctor
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11. Gradle doctor
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What about our 16 GB mackbooks?

12. Gradle doctor
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13. Gradle doctor
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Check how many daemons you’re using:

14. Gradle doctor
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Check how many daemons you’re using:

15. Gradle doctor
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Check Java home:

16. build
cache
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17. build
cache
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18. Gradle doctor
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More about Gradle doctor here:

19. build
cache
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MORE INFO:
https://speakerdeck.com/runningcode/what-is-the-android-cache-fix-plugin-and-why-do-i-need-t
o-solve-my-own-cache-misses?slide=14
https://medium.com/@cesarmcferreira/using-gradle-build-cache-server-73d7680baf2a
https://stackoverflow.com/questions/60528123/how-to-disable-gradles-local-build-cache-but-keep
-remote-cache-enabled

20. Idiomatic Unit Testing - Kotlin
Similar to:
https://phauer.com/2018/best-practices-unit-testing-kotlin/#recap-what-is-idiomatic-kotlin-c
ode
TLDR: don’t use static variables; favour val instead of var and try to write common logic
between test suites
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21. Jetpack Compose
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22. Jetpack Compose
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23. Jetpack Compose - samples
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https://github.com/android/compose-samples

24. Jetpack Compose - testing
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- don’t have to put Id’s
- jetpack preview performance has been greatly improved

25. Jetpack Compose - testing
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26. Jetpack Compose - testing
- we can add additional tags for testing
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27. Jetpack Compose - useUnmergedTree
- then we can ui-test using these tags
more here: https://developer.android.com/jetpack/compose/semantics
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28. Jetpack Compose - testing
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29. ATD - Automated Test Devices
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30. ATD - Automated Test Devices
API for Android Emulators:
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Gradle Managed Devices (GMD) - more info here

31. ATD - Automated Test Devices
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32. Jetpack compose - lottiefiles ?
Do you know any alternative to lottiefiles which can be used with Compose?
> you don’t need one -
Lottie already supports
Compose
LINK
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dependencies {
implementation 'com.airbnb.android:lottie-compose:1.0.0-alpha02'
}

33. Josef Raska - Module Rules [gradle]
Reference:
https://github.com/jraska/modules-graph-assert/blob/master/presentation/REFERENCES.md
GRAPH ASSERT plugin
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34. Josef Raska - Module Rules [gradle]
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35. Josef Raska - Module Rules [gradle]
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SAMPLE

36. Josef Raska - Module Rules [gradle]
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37. Flutter: Animation examples
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38. Flutter: Animation examples
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39. Flutter: Animation examples
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40. Flutter: Animation examples
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41. Flutter: Animation examples
Emily Fortuna - Animation - Flutter Europe
https://www.youtube.com/watch?v=wnARLByOtKA
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42. Flutter: Animation examples
Web app:
https://roszkowski.dev/animations/
Pdf:
https://github.com/orestesgaolin/
animations_samples/blob/master/docs/
presentation.pdf
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43. Don’t kill my app
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44. Don’t kill my app - benchmark
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45. Android 12 - Exoplayer
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https://github.com/google/ExoPlayer/releases/tag/r2.16.0

46. Android 12 - Exoplayer
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47. THANK YOU
@bkosarzycki