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Dropping ThreeTenABP in favor of Core Library Desugaring

If one uses AGP version 4.0+, it is possible to drop support for commonly used library from @JakeWharton which backports JSR-310 Date and Time API for Android. Friendly reminder here: pre-AGP 4.0+ projects with minSdk below 26 can't natively use any Java 8 APIs.

Enable desugaring

Two things must be done:

  1. enable codeLibraryDesugaringEnabled in android.compileOptions
  2. add desugar lib by coreLibraryDesugaring configuration
android {
...
 compileOptions {
    coreLibraryDesugaringEnabled true
 }
}

dependencies {
  coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.0.10'
}

The issue of timezone databases

On pre-29 API devices, timezone data is provided by the system itself, so its validity is dependant on OEMs and users, which my decide not to update Android to the newest version (or just can't).

With ThreeTenABP it was not a problem as ThreeTenABP provides timezone information with itself as a standard Android asset.

With Java 8 it is a problem as java.time takes system-level timezone information. To provide timezone data seperately from Android system while using desugaring, one might use @ZacSweers ticktock. This library allows to inlude own timezone data during desugaring. For details of the process go to blogpost: https://www.zacsweers.dev/ticktock-desugaring-timezones/