Java 8 and Android and You

Let's look at the status of Java 8 in the Android world. How can you use it? What are the limitations? Workarounds? And what is this thing with Jack and Jill anyway?

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Hack & Tell presented at Novoda -> http://novoda.tv
Video: https://www.youtube.com/watch?v=lEwIK3EY2g8

Transcript

1. Sebastiano
   Poggi
   java 8
   and
   android
   and
   you
   

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2. java 8
   

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3. java 8?
   

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4. yes, but…
   java 8?
   

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6. java 8
   added in android 7.0
   no more harmony
   switched to openjdk
   partial support*
   *varies by os version
   

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7. java 8
   best case scenario (api 24+)
   lambdas and method references
   java.util.function
   streaming and reflection apis
   repeatable annotations
   default and static interface methods
   

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8. java 8
   on pre-24
   lambdas and method references
   java.util.function
   runtime
   crash!
   streaming and reflection apis
   repeatable annotations
   default and static interface methods
   

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9. jack
   

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11. jack
    new compiling toolchain
    no javac/dx, one tool to rule them all
    .jack bytecode as intermediate language
    jill handles legacy .class files
    supports java 8 language features
    

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12. jack?
    yes, but…
    

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13. jack
    no .class means no java tooling
    no *guard, no mockito, no jacoco...
    no instant run support
    in alpha since announced
    and most importantly…
    

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14. DEPRECATED
    

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15. very cool!
    

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16. very cool!
    yes, but…
    

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17. what does
    that mean?
    

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18. the future
    likely to match jack java 8 support
    language features: partial backport
    new api: no backport
    basically like using retrolambda
    we can keep our tooling
    

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19. under the hood
    desugarer from bazel
    backports java 8 features
    bytecode manipulation
    anon inner classes for lambdas
    again, just like retrolambda (ish)
    

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20. source: https://realm.io/news/360andev-jake-wharton-java-hidden-costs-android/
    

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21. …questions
    

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