Rxjava2~from****那么多方法~学渣带你扣rxjava2

我都不知道自己哪里来的毅力。死扣这几个方法 但是 我想在就是想。 这几个方法 扣到哪里算哪里。今天没完成，会在转天继续完成。我会一直补充

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fromCallable

Returns an Observable that, when an observer subscribes to it, invokes a function you specify and then emits the value returned from that function.

This allows you to defer the execution of the function you specify until an observer subscribes to the ObservableSource. That is to say, it makes the function "lazy."

这是官网的解释。

Calls a Callable and emits its resulting single value or signals its exception.
这句话是对
ObservableFromCallable的描述

我们现不解释 先来看来那个例子

    Observable.fromCallable(new Callable