let

常用語(yǔ)非空判斷，【it】增加代碼可讀性

object?.let {
    setText(it.objText)
    setBackgroundColor(it.objColor)
}

also

常用語(yǔ)非空判斷，【it】增加代碼可讀性，適合鏈?zhǔn)秸{(diào)用

var object?.also{
    setText(it.objText)
    setBackgroundColor(it.objColor)
}.also{
    ...doSomething(it.objParam)
}

run

適合初始化并設(shè)置多條屬性，不需要返回值，例如：

findViewById<RecyclerView>(R.id.recycler).run {
            layoutManager = LinearLayoutManager(this@MainActivity)
            adapter = listAdapter
            addItemDecoration(DividerItemDecoration(this@MainActivity, LinearLayout.VERTICAL))
        }

apply

適合初始化并設(shè)置多條屬性并返回自身對(duì)象，例如：

private val paint = Paint().apply {
        isAntiAlias = false
        style = Paint.Style.STROKE
        color = getContext().getColor(R.color.colorAccent)
        strokeWidth = 4f.dp2px()
    }

with

val result:Int = with(supportData) {
            showInfo()
            spvTotal
        }
        with(supportDataNullAble) {
            this?.showInfo()
        }