[Android 知识点] RxAndroid的使用(五)（待更新）

Error Handling Operators 错误处理

• Catch — recover from an onError notification by continuing the sequence without error
• Retry — if a source Observable sends an onError notification, resubscribe to it in the hopes that it will complete without error

Observable Utility Operators 通用操作

• Delay — shift the emissions from an Observable forward in time by a particular amount
• Do — register an action to take upon a variety of Observable lifecycle events
• Materialize/Dematerialize — represent both the items emitted and the notifications sent as emitted items, or reverse this process
• ObserveOn — specify the scheduler on which an observer will observe this Observable
• Serialize — force an Observable to make serialized calls and to be well-behaved
• Subscribe — operate upon the emissions and notifications from an Observable
• SubscribeOn — specify the scheduler an Observable should use when it is subscribed to
• TimeInterval — convert an Observable that emits items into one that emits indications of the amount of time elapsed between those emissions
• Timeout — mirror the source Observable, but issue an error notification if a particular period of time elapses without any emitted items
• Timestamp — attach a timestamp to each item emitted by an Observable
• Using — create a disposable resource that has the same lifespan as the Observable

subscribeOn(Schedulers.io())

subscribeOn会修改我们刚刚创建的Observable。在默认情况下Observable的所有代码，包括刚才说到的只有在被订阅之后才会执行的代码，都会在执行subscribe()方法的线程中运行。而通过subscribeOn()方法，这些代码可以在其他线程中执行。

observeOn(AndroidSchedulers.mainThread())

告诉RxJava我们要在UI线程中观察这个Observable