commit | d4b8cabeb645a15714af077324562862daa90e18 | [log] [tgz] |
---|---|---|
author | Xin Li <delphij@google.com> | Sun Feb 21 09:25:14 2021 -0800 |
committer | Xin Li <delphij@google.com> | Sun Feb 21 20:19:46 2021 -0800 |
tree | 6727a90e4dfb0917f9197713d046f60a37cbb4e4 | |
parent | 8741244a795961763e721a04e90f63ba846a2055 [diff] | |
parent | 41279d546a5e091ce1d2ad1284411d159725ac5f [diff] |
Skip ab/7061308 in stage. Bug: 180401296 Merged-In: I3517bcef61ddd13b3c53662b5a67fcf9b5e18786 Change-Id: Ic4da2865af3edc575b16d88437c22e60d3a46b9f
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.