tag | e4aefff6027f3b52df5a08125e2eaf15280d7b47 | |
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tagger | The Android Open Source Project <initial-contribution@android.com> | Thu Jan 04 11:06:10 2024 -0800 |
object | 3d8587f304f249fb7e6f7ab35739cac67dbd186a |
Android platform 13.0.0 release 15
commit | 3d8587f304f249fb7e6f7ab35739cac67dbd186a | [log] [tgz] |
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author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Thu Jun 08 17:31:36 2023 +0000 |
committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Thu Jun 08 17:31:36 2023 +0000 |
tree | cbc2c6edd44f6cea7f1e05e2f25365a6644b436f | |
parent | 9ce8c93e9d15471e5df466769e8c72c81f39dc19 [diff] | |
parent | 8730d1c6f988f4e9a8aed3eb31a8b0389efae27e [diff] |
Snap for 10276566 from 8730d1c6f988f4e9a8aed3eb31a8b0389efae27e to tm-platform-release Change-Id: If4c0bf7f1fa73ddf2dc26cab65a9215e39310ff1
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.
An extension is a way to group a set of modules so that they are versioned together. We currently define a new extension for every Android SDK level that introduces new modules. Every module shipped in previous versions are also part of the new extension. For example, all the R modules are part of both the R extensions and the S extensions.
The steps to define a new extension are:
derive_sdk.cpp
by:GetSdkLevel
with the new enum setderive_sdk_test.cpp
verifying the new extensions workSdkExtensions.getExtensionVersion
API support the new extensions.