Kotlin 注释 IntDef [英] Kotlin Annotation IntDef

问题描述

我有这个代码示例:

class MeasureTextView: TextView {
    constructor(context: Context?) : super(context)
    constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)
    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int, defStyleRes: Int) : super(context, attrs, defStyleAttr, defStyleRes)

    companion object{
        val UNIT_NONE = -1
        val UNIT_KG = 1
        val UNIT_LB = 0            
    }

    fun setMeasureText(number: Float, unitType: Int){

        val suffix = when(unitType){
            UNIT_NONE -> {
                EMPTY_STRING
            }
            UNIT_KG -> {
                KG_SUFIX
            }
            UNIT_LB -> {
                LB_SUFIX
            }
            else -> throw IllegalArgumentException("Wrong unitType passed to formatter: MeasureTextView.setMeasureText")
        }

        // set the final text
        text = "$number $suffix"
    }
}

我希望能够在编译时将自动完成功能与 IntDef 注释结合使用，因此当我调用 setMeasureText(...) 时，静态变量显示为该方法参数的选项.

I want to be able to use, at compile time, the auto complete feature in conjunction with IntDef annotation, so when i invoke setMeasureText(...), the static variables are shown as options to the argument of this method.

我已经搜索过这个，但我找不到 Kotlin 是否支持这种 java 样式的注释(例如 intdef).所以我试过了，并为此做了一个注释，但它不会在自动完成中显示.

I have searched about this, and i couldn't find if Kotlin supported this java-style annotations (intdef for example). So i have tried it, and made an annotation for this, but it won't show in autocompletion.

我的问题:- Kotlin(最新版本)是否支持Java注解IntDef

My question: - Is Java annotation IntDef supported in Kotlin (latest version)

• 如果是，我如何在 Android Studio IDE 中打开(如果它有效，我无法让编译器建议它).

• If it is, how can i turn in ON in the Android Studio IDE (if it works, i can't get the compiler to suggest it).

如果不是，是否有任何 Kotlin 方式进行编译时检查

If it is not, is there any Kotlin-way of make this compile time checks

推荐答案

从 Kotlin 1.0.3 开始，不支持 @IntDef 注释，但计划在以后的版本中支持.

As of Kotlin 1.0.3, the @IntDef annotation is not supported, but support is planned for later versions.

Kotlin 进行这些编译时检查的方法是使用 enum 类 而不是一系列 Int 常量.

The Kotlin way of making these compile time checks is to use an enum class instead of a series of Int constants.

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