commit | 20e6707afa6435a916423d26c793df9f3254e431 | [log] [tgz] |
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author | android-build-team Robot <android-build-team-robot@google.com> | Mon Apr 11 19:01:27 2022 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Mon Apr 11 19:01:27 2022 +0000 |
tree | 37b6f8c863694af724096b81bbdf8778d31a07b7 | |
parent | 370407a753b40ab9fa357f0bdbb558a42493631a [diff] | |
parent | 8dd3ae2fb338aad5cc3eaaa68776627f84e8d85b [diff] |
Snap for 7423841 from 998e1e064c6e9e56041b0dc9122a877e4b6923b4 to sc-release am: f7289132ab am: 1c946abefe am: 4a3fecb088 am: aa9e833181 am: 8dd3ae2fb3 Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/14832203 Change-Id: I5c237718d40940b247aee8181bbcb3e72409c61e 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.