RxJava 2.2.4 发布了，RxJava 是一个在 Java VM 上使用可观测的序列来组成异步的、基于事件的程序的库。

主要更新内容如下：

API 更新

• Pull 6278: Add Maybe/Single/Completable materialize operator,

• Pull 6278: Add Single.dematerialize(selector) operator.

• Pull 6281: Add Flowable/Observable dematerialize(selector) operator.

Bug 修复

• Pull 6258: Fix cancel/dispose upon upstream switch for some operators.

• Pull 6269: Call the doOn{Dispose|Cancel} handler at most once.

• Pull 6283: Fix Observable.flatMap to sustain concurrency level.

• Pull 6297: Fix refCount eager disconnect not resetting the connection.

文档更新

• Pull 6280: Improve the package docs of io.reactivex.schedulers.

• Pull 6301: Add missing onSubscribe null-checks to NPE docs on Flowable/Observable subscribe.

• Pull 6303: Fix incorrect image placement in Flowable.zip docs.

• Pull 6305: Explain the non-concurrency requirement of the Emitter interface methods.

• Pull 6308: Explain the need to consume both the group sequence and each group specifically with Flowable.groupBy.

• Pull 6311: Explain that distinctUntilChanged requires non-mutating data to work as expected.

Wiki 更新

• Pull 6260: Add generate examples to Creating-Observables.md.

• Pull 6267: Fix Creating-Observables.md docs stlye mistake.

• Pull 6273: Fix broken markdown of How-to-Contribute.md.

• Pull 6266: Update Error Handling Operators docs.

• Pull 6291: Update Transforming Observables docs.

其他更新

• Pull 6262: Use JUnit's assert format for assert messages for better IDE interoperation.

• Pull 6263: Inline SubscriptionHelper.isCancelled().

• Pull 6275: Improve the Observable/Flowable cache() operators.

• Pull 6287: Expose the Keep-Alive value of the IO Scheduler as System property.

• Pull 6321: Fix Flowable.toObservable backpressure annotation.

下载地址：

• Source code(zip)

• Source code(tar.gz)