commit | da839529f481bdf20c2f2e2aaae6edc746d5cfa0 | [log] [tgz] |
---|---|---|
author | Artur Satayev <satayev@google.com> | Tue Mar 23 15:21:43 2021 +0000 |
committer | Artur Satayev <satayev@google.com> | Tue Apr 06 17:33:01 2021 +0100 |
tree | 0d71270eacd4ebb6e44fd3c65ab7937db1b70969 | |
parent | be3f8eabc8f7531c54f6e5abf2108acb627adf00 [diff] |
Expose classpaths.proto as python_library_host. Bug: 180105615 Test: N/A Change-Id: If940477ef961659496a83809f9949b964ecf4d56
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)
.
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.RollbackManagerServiceImpl#getExtensionVersions
to account for the new extension version.