Advanced Topics Android

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Inaki Villar @inyaki_mwc Advanced Android Topics

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Testing D8/R8 ART

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Testing

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Android Test ● Includes existing libraries ● APIs and Kotlin ● Open Source

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● Robolectric 4.0 (alpha) ● androidx.test support ● Support Espresso

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gradlew clean connectedAndroidTest

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gradlew clean connectedAndroidTest gradlew clean test

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gradlew clean connectedAndroidTest gradlew clean test

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https://proandroiddev.com/robolectric-testing-with-androidjunitrunner-86292bceef25

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D8/R8

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D8/R8 Kotlin File Java File kotlinc javac class dex apk

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D8/R8 Kotlin File Java File kotlinc javac class dex apk

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class dex apk

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class dex apk

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class dex apk

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dex

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dex

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D8/R8 kotlinc javac DX APK < 3.0

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D8/R8 kotlinc javac DX APK kotlinc javac DX DX Merging APK < 3.0 > 3.0

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D8/R8 kotlinc javac Desugar DX 3.0/3.1 APK

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D8/R8 kotlinc javac Desugar DX kotlinc javac D8 APK 3.0/3.1 3.1+ APK

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D8/R8 kotlinc javac Desugar DX kotlinc javac D8 APK 3.0/3.1 3.1+ APK

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75% reduced size of MainDexFile Release 56% reduced size of MainDexFile Debug 10% reduced time for Debug builds

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D8/R8 2nd phase : D8/DX(fully deprecated) - 1 year approx. 1st phase : D8/DX - 6 months approx. 3rd phase: DX removed from AS

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D8/R8

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D8/R8 kotlinc javac Proguard D8/DX No R8 APK

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D8/R8 kotlinc javac Proguard D8/DX kotlinc javac R8 APK No R8 APK

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D8/R8 Russia 0 - Spain 3

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D8/R8

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ART

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ART Applications Android Framework ART Native Libraries HAL Kernel

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ART Applications Android Framework ART Native Libraries HAL Kernel Dalvik Pre Lollipop

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ART Dalvik JIT Just In Time AOT Ahead Of Time

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ART Dalvik JIT Just In Time AOT Ahead Of Time App Run Translate ByteCode to Machine code Less Space Less Memory

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ART Dalvik JIT Just In Time AOT Ahead Of Time App Install Translate ByteCode to Machine code App Run Faster Better Startup Battery Performance

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JIT Returns

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JIT Returns

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Memory and Storage Kotlin Cloud Profiles ART

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ART

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ART

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ART

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ART Inlining - CheckParameterIsNotNull

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ART Inlining - CheckParameterIsNotNull https://blacklenspub.com/inline-function-in-kotlin-adb51b0eab76