Can not perform this action after onSaveInstanceState

项目中出现这个东西，查了源码之后发现

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

大致意思是说我使用的 commit方法是在Activity的onSaveInstanceState()之后调用的，这样会出错，因为onSaveInstanceState

方法是在该Activity即将被销毁前调用，来保存Activity数据的，如果在保存玩状态后再给它添加Fragment就会出错。解决办法就

是把commit（）方法替换成 commitAllowingStateLoss()就行了，其效果是一样的。

源码：

 public abstract int commitAllowingStateLoss();

     * <p class="note">A transaction can only be committed with this method
     * prior to its containing activity saving its state.  If the commit is
     * attempted after that point, an exception will be thrown.  This is
     * because the state after the commit can be lost if the activity needs to
     * be restored from its state.  See {@link #commitAllowingStateLoss()} for
     * situations where it may be okay to lose the commit.</p>