Activity和Fragment通信的几种方式：

1.接口的方式：

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class MainFragment : Fragment() {

    private lateinit var name : String


    fun setName(name : String){
        this.name = name
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_main, container, false)
    }

}
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class MainActivity : AppCompatActivity() {

    private lateinit var mainFragment: MainFragment

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mainFragment = MainFragment()
        mainFragment.setName("Hello")
    }
}

2.Bundle的方式：

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class MainFragment private constructor() : Fragment() {

    private lateinit var name: String
    private lateinit var mainFragment: MainFragment

    companion object {
        private lateinit var mainFragment: MainFragment

        fun newInstance(bundle: Bundle): MainFragment {
            mainFragment = MainFragment()
            mainFragment.arguments = bundle
            return mainFragment
        }
    }
 }

3.广播方式

4.eventBus、RxBus等事件

5.文件（File、SharedPreference方式等）

赏

本文地址： http://www.yppcat.top/2019/08/23/Activity和Fragment通信/