commit | a91362e94f2f2e25c60710be83454b15f164aaaf | [log] [tgz] |
---|---|---|
author | Anton Hansson <hansson@google.com> | Wed Jul 15 16:09:37 2020 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Wed Jul 15 16:09:37 2020 +0000 |
tree | c6f284e1486e1907b84c607dbd0e3ef3e4f3244e | |
parent | a4af9a59afcddc793905b2abef21433274983e32 [diff] | |
parent | 6a22e3db2933d6efe7081f9a0f93f59aa6f672fe [diff] |
Document SdkExtensions module structure am: a6caee837f am: e42e293263 am: 06a38553a0 am: 6a22e3db29 Original change: https://android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/1363499 Change-Id: I205d1f645059a958edac23bb56d2e7afdb6f349d
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)
.