Move CtsSdkExtensions into SdkExtension repository

These tests should live with the module they are testing.

Bug: 174123164
Test: presubmit (verify CtsSdkExtensions is running)
Merged-In: I7885e2307ae46248168de0b2fdbb154bf79bb406
Change-Id: I7885e2307ae46248168de0b2fdbb154bf79bb406
4 files changed
tree: da4dbde571944f37047aa4df20fbe2020631ce3d
  1. Android.bp
  9. derive_sdk/
  10. framework/
  12. manifest.json
  13. sdk.proto
  14. testing/
  15. tests/

SdkExtensions module

SdkExtensions is a module that decides the extension SDK level of the device, and provides APIs for applications to query the extension SDK level.


The module is packaged in an apex,, and has two components:

  • bin/derive_sdk: Native binary that runs early in the device boot process and reads metadata of other modules, to set system properties relating to the extension SDK (for instance build.version.extensions.r).
  • javalib/framework-sdkextension.jar: This is a jar on the bootclasspath that exposes APIs to applications to query the extension SDK level.

Deriving extension SDK level

derive_sdk is a program that reads metadata stored in other apex modules, in the form of binary protobuf files in subpath etc/sdkinfo.binarypb inside each apex. The structure of this protobuf can be seen here. The exact steps for converting a set of metadata files to actual extension versions is likely to change over time, and should not be depended upon.

Reading extension SDK level

The module exposes a java class SdkExtensions in the package android.os.ext. The method getExtensionVersion(int) can be used to read the version of a particular sdk extension, e.g. getExtensionVersion(Build.VERSION_CODES.R).