Can not perform this action afte

Fragment 在显示或者隐藏，移除是出现Can not perform this action after onSaveInstanceState #解决办法：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()

try {
            var mDismissed: Field = DialogFragment::class.java.getDeclaredField("mDismissed")
            mDismissed.isAccessible = true
            mDismissed.set(this, false)

            var mShownByMe: Field = DialogFragment::class.java.getDeclaredField("mShownByMe")
            mShownByMe.isAccessible = true
            mShownByMe.set(this, true)
        } catch (e: Exception) {
            e.printStackTrace()
           
        }
        val ft: FragmentTransaction = manager.beginTransaction()
        ft.add(this, tag)
        ft.commitAllowingStateLoss()