DialogFragment 全屏显示

https://stackoverflow.com/questions/7189948/full-screen-dialogfragment-in-android

1.重写onCreateDialog方法

  override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val root = RelativeLayout(activity)
        root.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT
                , ViewGroup.LayoutParams.MATCH_PARENT)

        val dialog = Dialog(activity)
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
        dialog.setContentView(root)
        dialog.window!!.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
        dialog.window!!.setLayout(ViewGroup.LayoutParams.MATCH_PARENT
                , ViewGroup.LayoutParams.MATCH_PARENT)

        return dialog
    }