Dialog Fragment Bundle 始终为空

Question

我只想将数据从 Fragment 发送到 DialogFragment。在片段中；

 val fm = requireActivity().supportFragmentManager
            val dialog = DialogFragmentName()
            val arg :Bundle? =null
            arg?.putInt("num",75)
            dialog.arguments = arg
            dialog.show(fm,"TAG")

在 DialogFragment 中；

 val bundle :Bundle? = arguments
    if (bundle != null) {
        val number: Int? = bundle.getInt("num")
        Toast.makeText(context,number,Toast.LENGTH_LONG).show()
    } else {
        Toast.makeText(context,"Null",Toast.LENGTH_LONG).show()
    }

但它总是给我 Null

Answer 1

您忘记初始化您的 Bundle，它被设置为 null 并且尝试将数据添加到 null 引用安全失败，因为 ?. 运算符最终发送空 Bundle

val fm = requireActivity().supportFragmentManager
val dialog = DialogFragmentName().apply{
      arguments = Bundle().apply{
          putInt("num",75)
      }
  }
dialog.show(fm,"TAG")

Dialog Fragment Bundle 始终为空

Dialog Fragment Bundle always null

android

kotlin

android-fragments

android-dialogfragment

dialogfragment