commit | de7bb306610ca530e158cd22703f37f76b52baf9 | [log] [tgz] |
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author | android-build-team Robot <android-build-team-robot@google.com> | Mon Apr 11 18:32:57 2022 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Mon Apr 11 18:32:57 2022 +0000 |
tree | 37b6f8c863694af724096b81bbdf8778d31a07b7 | |
parent | 4761eb5be9b41d92619f47c709b74400d4d6bd63 [diff] | |
parent | f7f411041d6cbb9aeff8f857d3ae483e1338cbc7 [diff] |
Snap for 7336869 from 88d08e065cca41f492704d37f15587f45c17f9a6 to sc-release am: 6b19eba0bf am: 870264c22c am: cde3705c6b am: ca856d7a66 am: f7f411041d Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/14433506 Change-Id: I6387eeaddf7d1e619d2f85370b3fad73c504fe18 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.