commit | 7650cd600defad7c72a746e7b83a6f50d46ae12f | [log] [tgz] |
---|---|---|
author | Xin Li <delphij@google.com> | Tue Sep 08 16:56:18 2020 -0700 |
committer | Xin Li <delphij@google.com> | Tue Sep 08 16:56:18 2020 -0700 |
tree | c6f284e1486e1907b84c607dbd0e3ef3e4f3244e | |
parent | e42e2932631a78bdf4f2e7706b1a0245da288ae5 [diff] | |
parent | bfef11fb4f7a99a16d13ec887421b7b9ea9867d3 [diff] |
Merge Android R Bug: 168057903 Merged-In: I50e7f5421205b77fa04666a84bf37ba7cdbb64ef Change-Id: I4298de076c316077fb43141f7b702e8dcf9e2eac
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)
.