DialogFragment Can not perform this action after onSaveInstanceState 问题的原因与解决

为了解决 Activity 调用 onSaveInstanceState 以后又调用了 DialogFragment.show 方法, 出现的 Can not perform this action after onSaveInstanceState, 我们可以在 DialogFragment 下重写 show 和 showNow 方法，使其支持 commitAllowingStateLoss

/**
 * 为了解决:mainActivity调用onSaveInstanceState以后又调用了show方法,
 * 出现的Can not perform this action after onSaveInstanceState
 * 这个异常(不应该用commit ,而是用commitAllowingStateLoss)
 * @param manager
 * @param tag
 */
override fun show(manager: FragmentManager, tag: String?) {
    val mClass = DialogFragment::class.java
    kotlin.runCatching {
        val dismissed = mClass.getDeclaredField("mDismissed")
        dismissed.isAccessible=true
        dismissed.set(this,false)
    }
    kotlin.runCatching {
        val shownByMe = mClass.getDeclaredField("mShownByMe")
        shownByMe.isAccessible=true
        shownByMe.set(this,true)
    }
    val ft = manager.beginTransaction()
    ft.add(this, tag)
    ft.commitAllowingStateLoss()
}

override fun showNow(manager: FragmentManager, tag: String?) {
    val mClass = DialogFragment::class.java
    kotlin.runCatching {
        val dismissed = mClass.getDeclaredField("mDismissed")
        dismissed.isAccessible=true
        dismissed.set(this,false)
    }
    kotlin.runCatching {
        val shownByMe = mClass.getDeclaredField("mShownByMe")
        shownByMe.isAccessible=true
        shownByMe.set(this,true)
    }
    val ft = manager.beginTransaction()
    ft.add(this, tag)
    ft.commitAllowingStateLoss()
}