commit | 90b898abe0d9122939a2efaf135a0058492ec99c | [log] [tgz] |
---|---|---|
author | android-build-team Robot <android-build-team-robot@google.com> | Thu Mar 18 20:22:20 2021 +0000 |
committer | android-build-team Robot <android-build-team-robot@google.com> | Thu Mar 18 20:22:20 2021 +0000 |
tree | 7d6dd59df3b397cc13fc77fab3f61862e3eec552 | |
parent | c1615d24592cfd0432e384265081b13afe5a944f [diff] | |
parent | 5455e89dd4e59b27e879d38c881078ad871e329e [diff] |
Snap for 7218917 from 5455e89dd4e59b27e879d38c881078ad871e329e to mainline-cellbroadcast-release Change-Id: Iaa4081f8abb84aa7d6763c3fe3d667db617dd06b
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)
.
For every new Android SDK level a new extension version should be defined. These are the steps necessary to do that:
derive_sdk.cpp
by:GetSdkLevel
with the new enum setderive_sdk_test.cpp
verifying the new extensions worksSdkExtensions.getExtensionVersion
API support the new extensions.RollbackManagerServiceImpl#getExtensionVersions
to account for the new extension version.