Android代码RxJava封装的ViewStub。使用方式与RxBinding相似。

README.md RxViewStub Sketch Sometimesyourlayoutmightrequirecomplexviewsthatarerarelyused."Gone"or"Invisible"isnotagoodideafotthat,becausethesepropertiescan'tpreventviewaddtotheviewhierarchyandalsohurtperformance.ButtheViewStubisaninvisibleandzero-s