[教学] 旋转荧幕就错误 Unable to instantiate fragment

旋转荧幕就错误 - Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.Tab2Fragment: make sure class name exists, is public, and has an empty constructor that is public

不管怎样，一定要有一个空的constructor，不然一定报错当旋转荧幕。
请参考如下：

1. public class Tab2Fragment extends Fragment  {
   
2.         private int iPage = 1;   
   
3. 
   
4.         public Tab2Fragment(){}
   
5.        
   
6.         public Tab2Fragment(int xiPage){
   
7.                 iPage = xiPage;
   
8.         }
   
9. }

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