KMM Kickstart For Android Developers

Overview of the KMM ecosystem for Android developers. We're hiring and training folks, so pushed the basics into a bunch of slides. https://touchlab.co/careers-3/

Transcript

1. KMM Kickstart For Android Developers
   Kevin Galligan
   

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2. Touchlab
   

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4. KMM Kickstart For Android Developers:
   

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5. KMM Kickstart For Android Developers:
   we’re hiring
   

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6. Xcode
   Frameworks
   K/N Threading
   Linker?
   

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7. You fell victim to one of the classic blunders!
   

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8. We’ll Cover
   • Overview of KMP/KM
   M
   
   • Status/future of the tec
   h
   
   • KaMP Ki
   t
   
   • Architecture Thought
   s
   
   • Tool
   s
   
   • Next Steps
   

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9. Technology Definitions
   

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10. Kotlin Multiplatform (KMP)
    

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11. Common
    JVM JS Native
    

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12. It’s the interop
    generally very good
    

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13. Common
    JVM JS Native
    

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14. Common
    JVM JS Native
    iOS Mac
    Linux Windows
    Android/NDK Wasm
    Others…
    Java-6 Java-8
    Android
    Browser
    Node
    Typescript(?)
    

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15. Kotlin Multiplatform Mobile (KMM)
    

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16. KMM
    •is mostly a branding designation (it’s still KMP
    )
    
    •has a dedicated website and docs to help get starte
    d
    
    •has an Android Studio plugin built just for mobile (ish)
    

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17. Why KMP/KMM?
    

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18. kot·lin mul·ti·plat·form
    
    
    /ˌkätˈlin məltiˈplatfôrm,ˌkätˈlin məltīˈplatfôrm/
    
    
    noun
    
    
    noun: kotlin multiplatform
    
    
    1.optional, natively-integrated, open-source, code sharing platform, based on the popular,
    modern language kotlin. facilitates non-ui logic availability on many platforms.
    

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19. kot·lin mul·ti·plat·form
    
    
    /ˌkätˈlin məltiˈplatfôrm,ˌkätˈlin məltīˈplatfôrm/
    
    
    noun
    
    
    noun: kotlin multiplatform
    
    
    1.optional, natively-integrated, open-source, code sharing platform, based on the popular,
    modern language kotlin. facilitates non-ui logic availability on many platforms.
    Oh, and JetBrains!
    

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20. Shared Native Code
    not “cross platform”
    

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21. Android is Kotlin
    half of it isn’t “cross platform”
    

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22. Not (necessarily) UI
    Compose and Swift UI compatible!
    

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25. Low Risk
    bigger orgs worry about such
    

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26. Memory Lane
    

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27. 2020 is KMP’s year
    it’s all coming together
    

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29. https://kotlinlang.org/lp/mobile/case-studies/
    

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31. KMM Developer
    https://touchlab.co/careers-3/
    

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32. KMM Developer
    https://touchlab.co/careers-3/
    (Remote, now and post-pandemic)
    

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33. KMM Status
    it’s complicated
    

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34. https://kotlinlang.org/docs/mobile/kmm-evolution.html
    Kotlin/JVM Stable
    Kotlin/Native Runtime Beta
    Multiplatform Gradle plugin Beta
    Kotlin/Native interop with C and Objective C Beta
    CocoaPods integration Beta
    Multiplatform IDE support Alpha
    KMM plugin for Android Studio Experimental
    

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36. https://www.youtube.com/watch?v=L8Xq15NTuCc
    

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37. KaMP Kit
    

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39. May 2021
    where are we?
    

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40. https://kotlinlang.org/lp/mobile/
    

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42. First 5 Minutes
    hit the ground running
    

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45. Alternatives we like…
    

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46. https://github.com/joreilly/PeopleInSpace
    

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47. https://github.com/joreilly/PeopleInSpace
    

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48. https://github.com/Kotlin/kmm-production-sample
    

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49. But Compose?!
    one new thing at a time
    

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50. OK, Actually Starting
    they say never live code…
    

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51. OK, Actually Starting
    they say never live code…
    

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52. General Patterns
    what we’re seeing
    

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53. Specific Modules
    

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54. Analytics
    Android Framework
    Android
    
    
    Stuff
    iOS
    
    
    Stuff
    

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55. Shared Architecture
    

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56. Analytics
    Android Framework
    Android
    
    
    Stuff
    iOS
    
    
    Stuff
    

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57. App Stuff
    Android Framework
    Android
    
    
    Stuff
    iOS
    
    
    Stuff
    

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58. KaMP Kit is Shared Architecture
    

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60. I’m mostly not UI layer
    

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61. LinearLayout FTW
    Compost?
    fill_parent?
    

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62. App Stuff
    Android Framework
    Android
    
    
    Stuff
    iOS
    
    
    Stuff
    

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63. App Stuff
    Framework
    

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64. App Stuff
    Framework
    lambda lambda
    

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65. App Stuff
    Framework
    VM/Lifecycle
    
    
    Coroutines
    

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66. Android is pretty simple
    iOS is a debate
    

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67. App Stuff
    Framework
    lambda
    VM/Lifecycle
    
    
    Coroutines
    

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68. Compiler Created Interfaces
    call suspend functions from iOS
    

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69. Community Libraries
    

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70. Working on a thing
    coming soon…
    

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71. App Stuff
    Framework
    VM/Lifecycle
    
    
    Coroutines
    VC/Lifecycle-
    
    
    Aware
    Coroutine Scope/
    
    
    Interface Manager
    

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72. App Stuff
    Framework
    lambda
    VM/Lifecycle
    
    
    Coroutines
    

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73. Libraries
    

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74. Libraries
    • SQLDelight (DB
    )
    
    • Ktor (Networking
    )
    
    • Kotlinx.Serialization (Json
    )
    
    • Kotlinx.Coroutines (Async/
    Concurrency)
    • Kermit (logging
    )
    
    • Multiplatform Settings (Key/Value
    )
    
    • Stately (K/N Concurrency
    )
    
    • Koin (DI/not-DI?)
    

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76. CREATE TABLE Breed (
    
    
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    
    
    name TEXT NOT NULL UNIQUE,
    
    
    favorite INTEGER NOT NULL DEFAULT 0
    
    
    );
    
    
    selectAll:
    
    
    SELECT * FROM Breed;
    
    
    selectById:
    
    
    SELECT * FROM Breed WHERE id = ?;
    
    
    selectByName:
    
    
    SELECT * FROM Breed WHERE name = ?;
    
    
    insertBreed:
    
    
    INSERT OR IGNORE INTO Breed(id, name)
    
    
    VALUES (?,?);
    
    
    deleteAll:
    
    
    DELETE FROM Breed;
    
    
    updateFavorite:
    
    
    UPDATE Breed SET favorite = ? WHERE id = ?;
    
    
    

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77. public data class Breed(
    
    
    public val id: Long,
    
    
    public val name: String,
    
    
    public val favorite: Long
    
    
    ) {
    
    
    public override fun toString(): String = """
    
    
    |Breed [
    
    
    | id: $id
    
    
    | name: $name
    
    
    | favorite: $favorite
    
    
    |]
    
    
    """.trimMargin()
    
    
    }
    

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78. public interface TableQueries : Transacter {
    
    
    public fun selectAll(mapper: (
    
    
    id: Long,
    
    
    name: String,
    
    
    favorite: Long
    
    
    ) -> T): Query
    
    
    public fun selectAll(): Query
    
    
    public fun selectById(id: Long, mapper: (
    
    
    id: Long,
    
    
    name: String,
    
    
    favorite: Long
    
    
    ) -> T): Query
    
    
    public fun selectById(id: Long): Query
    
    
    public fun selectByName(name: String, mapper: (
    
    
    id: Long,
    
    
    name: String,
    
    
    favorite: Long
    
    
    ) -> T): Query
    
    
    //Yada yada
    
    
    }
    

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79. Tools
    

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80. Android Studio
    obviously
    

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82. Xcode
    you’re *definitely* going to use Xcode
    

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83. https://github.com/touchlab/xcode-kotlin
    

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84. Some More Info
    

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85. Kotlin/Native Concurrency
    

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86. Common
    JVM JS Native
    

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88. Two Rules
    it’s actually pretty simple
    

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89. Mutable == 1 thread
    

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90. Immutable == many threads
    

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91. Immutable means Frozen
    call freeze()
    

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93. Xcode Frameworks
    like AAR’s (kind of)
    

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94. Xcode Frameworks
    like AAR’s (kind of)
    

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95. Xcode Frameworks
    like AAR’s (kind of)
    

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96. Interface is Objective-C
    swift is pretty good at talking to Objc
    

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97. Analytics
    Android Framework
    Android
    
    
    Stuff
    iOS
    
    
    Stuff
    

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98. Analytics
    Android Framework
    Android
    
    
    Stuff
    iOS
    
    
    Stuff
    Tax Calc
    Framework
    

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99. Analytics
    Android Framework
    Android
    
    
    Stuff
    iOS
    
    
    Stuff
    Tax Calc
    Framework
    

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100. https://www.youtube.com/watch?v=hrRqX7NYg3Q
     

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101. Touchlab
     

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102. What’s Next?
     

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103. KaMP Kit Docs
     • More on Concurrenc
     y
     
     • “Selling” to your tea
     m
     
     • Some info on integrating with existing project
     s
     
     • Other assorted docs
     

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104. Kotlin Slack
     this is critical
     

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105. https://kotlinlang.org/lp/mobile/
     

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106. Final Words
     quick Touchlab pitch
     

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108. KMM Developer
     https://touchlab.co/careers-3/
     

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109. KMM Developer
     https://touchlab.co/careers-3/
     Will train Android devs!
     

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110. KMM Developer
     https://touchlab.co/careers-3/
     (Also looking for KMP/KMM experts)
     

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113. Thanks!
     @kpgalligan
     touchlab.co
     

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