commit | d971c4d79af78a4ace4695000bbe1737ff3f25e4 | [log] [tgz] |
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author | android-build-team Robot <android-build-team-robot@google.com> | Mon Apr 11 18:27:25 2022 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Mon Apr 11 18:27:25 2022 +0000 |
tree | 50c60ff0f84207397dd4ce83dd68d53c0de09324 | |
parent | a400a69b796376cb026cd6788b19879ec4579141 [diff] | |
parent | 9880076ffb7746d684659718a690e28a4591a8be [diff] |
Snap for 7419753 from 9cd7e10cc0c8efb24d23a02f1683b2caa035f13d to sc-release am: aec8b7526d am: 410465fcae am: 31e80bd670 am: 9880076ffb Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/14808507 Change-Id: I6b1b64a2baa5cc136edcc95af6e338e213d746a8 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
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.pb
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.