android fragment 構造函數非public

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.yjclw.shop/com.yjclw.shop.activitys.OrderListMangeActivity_}: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.yjclw.shop.fragment.OrderListShowByDateFragment: make sure class name exists, is public, and has an empty constructor that is public

查看代碼，竟然發現是private，但是在開發的機子上沒有 報錯，而在用戶的機型上報錯了。 三星 galaxy s3. 先改回來public。