kotlin的abstract抽象类与interface接口建模按钮android点击事件处理

kotlin的abstract抽象类与interface接口建模按钮android点击事件处理

例如：

abstract class View {
    private var listener: OnClickListener? = null
    private var enabled: Boolean = false

    constructor() {
        println("view constructor")
    }

    fun setClickListener(l: OnClickListener) {
        listener = l
    }

    fun setEnable(bool: Boolean) {
        enabled = bool
    }

    fun performClick() {
        println("view performClick")

        if (enabled) {
            listener?.onClick(this@View) //也可以this，this@后面指定是谁
        }
    }
}

interface OnClickListener {
    fun onClick(view: View)
}

class Button : View()

fun main(args: Array<String>) {
    var button = Button()
    button.setEnable(true)

    button.setClickListener(object : OnClickListener {
        override fun onClick(view: View) {
            println("on click")
        }
    })

    button.performClick()
}

输出：

view constructor
view performClick
on click

https://blog.csdn.net/zhangphil/category_12220817.htmlhttps://blog.csdn.net/zhangphil/category_12220817.html