android学习笔记之Fragment两种获得FragmentManager方式比较

用到Fragment时，导v4中包，在获得FragmentManager后，开启事务一直出现NullPointerException。于是网上查了两者的区别：两种说法

1，When you are using android.support.v4.app.FragmentManager then you should use getSupportFragmentManager() and if you are using android.app.FragmentManager then use getFragmentManager().大意是说v4包下，就要用support。

2，If you are using API >= 14, then use getFragmentManager() and while using Support Package you have to use getSupportFragmentManager()。说的是api大于14可以不用support的方法。又学一课。