commit | 4b6831e1f2ab2e7e1b258a5d7f25a2533d63c4d4 | [log] [tgz] |
---|---|---|
author | Xin Li <delphij@google.com> | Thu Oct 08 17:23:15 2020 -0700 |
committer | Xin Li <delphij@google.com> | Thu Oct 08 17:23:15 2020 -0700 |
tree | 7cce5bc03232ed1dc250d32fcc555a7e3231bf38 | |
parent | 35b006bd4db451300d07a11ed02083b509880283 [diff] | |
parent | 6a22e3db2933d6efe7081f9a0f93f59aa6f672fe [diff] |
Skip ab/6749736 in stage. Merged-In: I64d70eabe501f590752029398843d0d5d71585be Change-Id: I7df2cd1ca1fa70ff4396849cec86e50c247f1fb0
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)
.