[移动开发]Kotlin Fragment如何向Activity传值

采用接口回调
在Fragment中定义接口及复写onAttach

  private var listener: Mylistener? = null

    interface Mylistener {
        fun thanks(code: String?)
    }

    override fun onAttach(context: Context) {
        listener = activity as Mylistener
        super.onAttach(context)

    }
    调用 listener?.thanks("1")

Activity中直接实现Mylistener接口，即可得到数据

   override fun thanks(code: String?) {
        if(code=="1"){
            mRightTv.visibility=View.VISIBLE
        }else{
            mRightTv.visibility=View.GONE
        }

    }