Use Jack

[Jared Burrows]

Docs:

• http://tools.android.com/tech-docs/jackandjill
• https://developer.android.com/guide/platform/j8-jack.html
• http://tools.android.com/knownissues

Todo:

• classpath "com.google.guava:guava:19.0"
  • http://b.android.com/213471 - fix in 2.3
• Annotation processing bug in 2.3.0-beta1
  • http://b.android.com/231774
• Get Jacoco working and other coverage plugins working
  • jack does not have variant.javaCompiler.source
  • https://android.googlesource.com/platform/prebuilts/sdk/+/master/tools/README-jack-code-coverage.md
• Unit tests pass
• Espresso tests pass
• Test APK runs on API 19 emulator (< API 21)
• Test APK runs on API 21+ emulator

Other issues that do not prevent this from being merged:

• Data binding support - http://b.android.com/210615 - fix in 2.3
• Signing config message - http://b.android.com/224293
• Incremental jack compiler - http://b.android.com/224292
• Jack coverage plugin - http://b.android.com/224294 - fix in 2.3
• Lint detector - Use Retrolambda's lombok for now - https://github.com/jaredsburrows/android-gif-example/blob/master/build.gradle

[Jared Burrows]

Jack is being deprecated: https://android-developers.googleblog.com/2017/03/future-of-java-8-language-feature.html.