commit | e42e2932631a78bdf4f2e7706b1a0245da288ae5 | [log] [tgz] |
---|---|---|
author | Anton Hansson <hansson@google.com> | Wed Jul 15 15:29:25 2020 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Wed Jul 15 15:29:25 2020 +0000 |
tree | 8d96ddabdbd548175e4733dc3b61fb1958d95d3d | |
parent | 81c108dd98bc6779f302b4716ac806bffd2c831f [diff] | |
parent | a6caee837fb07a59121a9fe4ae5c72649daf9e42 [diff] |
Document SdkExtensions module structure am: a6caee837f Original change: https://android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/1363499 Change-Id: I42471f71da31198033bd43274d6914aee8be8757
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, com.android.sdkext
, 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.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.
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)
.