java.lang.IndexOutOfBoundsException: Invalid item position 0(0). Item count:0 android.support.v7.widget.RecyclerView{901d672 VFED..... .F....I. 0,0-0,0 #7f0800c6 app:id/recycler1}, adapter:com.dingmouren.example.layoutmanagergroup.fragment.PickerFragment$MyAdapter@34b3ac3, layout:com.dingmouren.layoutmanagergroup.picker.PickerLayoutManager@8c19f40, context:com.dingmouren.example.layoutmanagergroup.MainActivity@21e0b16
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5779)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748)
at com.dingmouren.layoutmanagergroup.picker.PickerLayoutManager.onMeasure(PickerLayoutManager.java:69)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3210)
at android.view.View.measure(View.java:23279)
...