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vi...@google.com
We have shared this with our product and engineering team and will update this issue with more information as it becomes available.
vi...@google.com
Thanks for reporting this issue.
We have added the ByteBuffer flip() method to the ByteBuffer class to the runtime since Android 10 (API level 29) .
See @CovariantReturnType(returnType = ByteBuffer.class, presentAfter = 28)
However, calling this method from an app on Android 9 or older device will result in a app crash.
need to resort to cast so that compatible multi-platform bytecode is emitted.
The cast is necessary to be compatible with Android 9 or older device. (and necessary to run on OpenJDK 8, I believe)
Note that flip() returns this buffer. You don't normally need the return instance, but can keep using ByteBuffer bb instance instead.
We will think about updating the Android SDK once Android 9 is not widely supported.
Description
Starting with Java 9, some methods of subclasses of
java.nio.Buffer, e.g.,ByteBuffer, start to return the specific Buffer type, e.g.,ByteBufferinstead of justBufferExamples include
flip()andposition().Android never reflected this change and, for example,
ByteBuffer.flip()still returnsBufferinstead ofByteBufferAs a result, multi-platform libraries, i.e., libraries that target Android and Java either need to use "--release 8", which is undesirable, or need to resort to cast so that compatible multi-platform bytecode is emitted.
For example:
must become
which adds noise to the code.
To avoid this, please consider adjusting Android's API regarding NIO Buffers to match the current Java API.