commit | c826af73873a1853be260de84295e3bcff8c1008 | [log] [tgz] |
---|---|---|
author | android-build-team Robot <android-build-team-robot@google.com> | Mon Feb 08 23:47:23 2021 +0000 |
committer | android-build-team Robot <android-build-team-robot@google.com> | Mon Feb 08 23:47:23 2021 +0000 |
tree | 1097908edf547d01327bf300d85f650917d309de | |
parent | 57c608ec0da7010a2a2a32e0c55fc5d565041149 [diff] | |
parent | e5155685166333e3b3c5599e2775e9c7751dba78 [diff] |
Snap for 7132927 from e5155685166333e3b3c5599e2775e9c7751dba78 to mainline-os-statsd-release Change-Id: Ifda060862ec7158e12035b786a8e97cab8976064
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.