Android - Gradle build optimisation

Simple tips on how to speed up your Android builds.
This talk is inspired by Stefan Oehme ( Gradle, Lead Developer) talk on “IMPROVING ANDROID BUILD PERFORMANCE” - Droidcon Berlin 2018

Transcript

1. Gradle optimisation Speed up kotlin/android builds Bartosz Kosarzycki @bkosarzycki July 26, 2018
2. Gradle build phases: - Initialization - Configuration - Execution
3. +
4. How can we solve this? - Modularization => Compile avoidance - Decoupled code => Faster incremental builds
5. Increase memory which is available to Android Studio
6. Increase memory Default: 1246 MB
7. Check gradle wrapper version
8. Currently the newest version is: 4.8.1 Check gradle version {project_home}/gradle/wrapper/gradle-wrapper.properties
9. - In 4.8.1 disable Google’s experimental “Configure on demand” * What went wrong: A problem occurred evaluating project ':repository'. > Failed to apply plugin [id 'com.android.library'] > Configuration on demand is not supported by the current version of the Android Gradle plugin since you are using Gradle version 4.6 or above. Suggestion: disable configuration on demand by setting org.gradle.configureondemand=false in your gradle.properties file or use a Gradle version less than 4.6. Check gradle version - “instant run” is lost due to Android Studio & gradle incompatibility
10. Do not mix Java/Kotlin files in one module
11. Solution: Extract legacy Java files into a separate module if you cannot convert them to kotlin
12. Enable build caches
13. Solution: org.gradle.caching=true Info: https://developer.android.com/studio/build/build-cache Clear cache: ./gradlew cleanBuildCache {project_home}/gradle.properties
14. Prevent Crashlytics from ruining your incremental builds
15. Fix for Crashlytics buildTypes { debug { debuggable true minifyEnabled false shrinkResources false ext.enableCrashlytics = false ext.alwaysUpdateBuildId = false } }
16. Use offline mode when no new dependencies are added
17. Disable multidex
18. Disable multidex android { defaultConfig { multiDexEnabled false } } // MIN API LEVEL : 21
20. Predex libraries
21. Predex libraries android { dexOptions { preDexLibraries true } } Predexing builds dex file out of libraries so it can be used in incremental builds (not building dex files each time for libraries). Using this feature increases clean build time.
22. Avoid annotation processors especially those breaking incremental builds
23. Solution: - Use gradle > 4.7 - Use only Annotation Processor which do support incremental builds - Google’s data-binding AP does NOT support it (work in progress) https://github.com/gradle/gradle/issues/5277 Incremental Annotation Processors:
24. Keep kotlin lang & libraries up-to-date
25. Enable D8 Next generation dex compiler
27. Android R8 compiler is still experimental (July 2018)
28. Source: Droidcon NYC 2016 - Lightning fast Android builds with Gradle + Buck
29. BAZEL builds (Google): $> brew install bazel - different project structure - create WORKSPACE file with sdk info - create BUILD file with
31. Use gradle profiler
32. - download repository here + docs - compile - make an alias for ‘gradle-profiler’ Install gradle profiler: > ./gradlew installDist cp ./build/install/gradle-profiler/* ~/custom/gradle-profiler alias gradle-profiler='~/custom/gradle-profiler/bin/gradle-profiler'
33. Profile build performance: > ./gradlew clean > gradle-profiler --benchmark --project-dir . assembleDebug > open ./profile-out/benchmark.html - from inside project’s directory:
36. Gradle profiler with FlameGraphs
37. - Linux-only (currently) - Download ‘honest-profiler’ & ‘flame-graph’ Gradle-profiler with FlameGraph > gradle-profiler --profile hp --hp-home ~/custom/honest-profiler --fg-home ~/custom/flame-graph --project-dir . assembleDebug
38. Use gradle scans http://scans.gradle.com
39. Gradle scans: $ ./gradlew build --scan BUILD SUCCESSFUL in 6s Do you accept the Gradle Cloud Services license agreement (https://gradle.com/terms-of-service)? [yes, no] yes Gradle Cloud Services license agreement accepted. Publishing build scan... https://gradle.com/s/czajmbyg73t62 - uses cloud web services
43. Future: use static/binary/ prebuilt libraries ?
44. Android Studio Preferences
45. Android Studio Preferences
46. Convert Android Traceview into flamegraphs
47. Convert Android Traceview...
48. Into Flamegraph LINK
49. Links / References - Stefan Oehme / Gradle, Lead Developer - Droidcon Berlin 2018 - “IMPROVING ANDROID BUILD PERFORMANCE” / Intermediate / Best Practices / Code Quality / Talk - link - Speed-up Android builds - link - TraceView into FlameGraph - link - Gradle-Profiler - link
50. QUESTIONS?