commit | ef24f46f530bb8d32fb8da8fb61dd7895d1a8543 | [log] [tgz] |
---|---|---|
author | Anton Hansson <hansson@google.com> | Tue Apr 27 10:45:37 2021 +0100 |
committer | Anton Hansson <hansson@google.com> | Tue Apr 27 11:46:27 2021 +0100 |
tree | 45b0ee4d421aa5361d4acbf6db1b0c342dae0bc8 | |
parent | fd5290ff5f40d6328606441d061fa47b11d03fb1 [diff] |
Change ALL_EXTENSIONS depending on API level R devices only have the R extensions, whereas S devices have both R and S extensions. Set the array contents accordingly. Bug: 185567297 Test: CtsExtensionsTest Change-Id: Ibdb2f1ba91d05c1e29a9769a476e2871e92f0403
SdkExtensions module is responsible for:
The module is packaged in an apex, com.android.sdkext
, and has several components:
bin/derive_classpath
: a native binary that runs early in the device boot process. It reads individual classpath configs files from the system and other modules, merges them, and defines the definition of *CLASSPATH environ variables.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)
.
derive_classpath
service reads and merges individual config files in the /system/etc/classpaths/
and /apex/*/etc/classpaths
. Each config stores protobuf message from classpaths.proto
in a proto binary format. Exact merging algorithm that determines the order of the classpath entries is described in derive_classpath.cpp
and may change over time.
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.