commit | 966175d41d73cfa19d05c8ddde659f624a1cff1f | [log] [tgz] |
---|---|---|
author | Anton Hansson <hansson@google.com> | Mon Nov 09 15:03:34 2020 +0000 |
committer | Anton Hansson <hansson@google.com> | Tue Dec 29 13:35:41 2020 +0000 |
tree | 16f55f7281cf6338e95e2d640575da66b8f9ebad | |
parent | 846c8e02fab989595d61c2555a01bd92f6069d7a [diff] |
Add an sdk module for SdkExtensions Every module that exports prebuilts should have one of these. Eventually we'll want to replace the manual stubs-prebuilt generation with a single build invocation. Test: m sdkextensions-sdk Change-Id: I203b3816368e2375c88b5944808dbd3633668e24
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)
.