让你的代码减少三倍!使用kotlin开发Android(五) 监听器


让你的代码量减少3倍!使用kotlin开发Android(四) kotlin bean背后的秘密







### 注意这个适配器里使用的一些小技巧










其中给了一个函数变量mListener, 他的输入为int,返回值为Unit(kotlin的null,不过是个具体的对象)





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29 thoughts on “让你的代码减少三倍!使用kotlin开发Android(五) 监听器

  1. var mListener: ((pos: Int) -> Unit)? = null

    fun setOnItemClickListener(listener: ((pos: Int) -> Unit)){
    mListener = listener
    } 请分析一下 ((pos: Int) -> Unit) 这是个什么类型

  2. adapter.setOnItemClickListener { pos->toast(“$pos”) }
    activity里面的这个代码 pos->toast(“$pos”) } 这个参数 pos怎么来的啊

      1. 这不叫回调把,就是把adatpter的监听器初始化为pos->toast(“$pos”) ,然后当你点击adapter里面item,会调用该监听器的执行方法。

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  13. listener: ((pos: Int) -> Unit)