将代码从Java更改为Kotlin后，注释未正确转换

Posted 2021-05-05

将一些Java代码转换为Kotlin（以创建ReplacementSpan）后，将返回与注释相关的错误。

from构造函数中的@IntRange(from = 0)返回错误：

'IntRange'不是注释类|找不到具有此名称的参数：from

import android.graphics.Canvas
import android.graphics.Paint
import sun.swing.SwingUtilities2.drawRect
import android.text.style.ReplacementSpan

class HrSpan : ReplacementSpan() {
    override fun getSize(
        paint: Paint, text: CharSequence, @IntRange(from = 0) start: Int,
        @IntRange(from = 0) end: Int, fm: Paint.FontMetricsInt?
    ): Int {
        return 0
    }

    override fun draw(
        canvas: Canvas, text: CharSequence, @IntRange(from = 0) start: Int,
        @IntRange(from = 0) end: Int, x: Float, top: Int, y: Int, bottom: Int,
        paint: Paint
    ) {
        canvas.drawRect(x, top.toFloat(), y.toFloat(), (top + 8).toFloat(), paint)
    }
}

答案

Kotlin将自己的IntRange类与Android SDK的IntRange注释混淆。

进行类似的导入，给它另一个名字：

import android.support.annotation.IntRange as AndroidIntRange

并像这样使用它：

fun foo(@AndroidIntRange(from = 0, to = 255) bar: Int) {
}