Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerViewLayoutManager.onMeasur
RecycleView空指针异常
错误代码如下：java.lang.NullPointerException: Attempt to invoke virtual method ‘void android.support.v7.widget.RecyclerViewLayoutManager.onMeasure(android.support.v7.widget.RecyclerViewRecycler, android.support.v7.widget.RecyclerView$State, int, int)’ on a null object reference
主要原因是LinearLayoutManager问题。在onCreateView里加载含有RecycleView布局时，RecycleView立马就需要需要LinearLayoutManager，如果LinearLayoutManager写在其他地方如handler里，加载完布局是找不到LinearLayoutManager就会报空指针异常。
解决方法：直接把LinearLayoutManager写在onCreateView方法里，同时还要将其设置给recycleview控件并设置其setOrientation属性