commit | 6a22e3db2933d6efe7081f9a0f93f59aa6f672fe | [log] [tgz] |
---|---|---|
author | Anton Hansson <hansson@google.com> | Wed Jul 15 15:59:54 2020 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Wed Jul 15 15:59:54 2020 +0000 |
tree | c6f284e1486e1907b84c607dbd0e3ef3e4f3244e | |
parent | 1977afd2ad0c9b333b337ce30ef28e19b3a3b4d5 [diff] | |
parent | 06a38553a0b2235b58dde2abb2e349e7db6dde06 [diff] |
Document SdkExtensions module structure am: a6caee837f am: e42e293263 am: 06a38553a0 Original change: https://android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/1363499 Change-Id: I64d70eabe501f590752029398843d0d5d71585be
SdkExtensions is a module that decides the extension SDK level of the device, and provides APIs for applications to query the extension SDK level.
The module is packaged in an apex, com.android.sdkext
, and has two components:
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)
.