ViewGroup.getChildMeasureSpec(int spec, int padding, int childDimension)解释
源码中的方法解释/***DoesthehardpartofmeasureChildren:figuringouttheMeasureSpecto*passtoaparticularchild.ThismethodfiguresouttherightMeasureSpec*foronedimension(heightorwidth)ofonechildview.**Thegoalistocombin