Annotations not converted properly after changing code from Java to Kotlin

Question

After converting some Java code to Kotlin (to create a ReplacementSpan), an annotation-related error is returned.

from in the @IntRange(from = 0) constructor returns an error:

'IntRange' is not an annotation class | Cannot find a parameter with this name: 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)
    }
}

Willi Mentzel · Accepted Answer · 2020-06-19 20:21:50Z

5

Kotlin confuses its own IntRange class with the IntRange annotation of the Android SDK.

Make an import like that giving it another name:

For Android Support library:

import android.support.annotation.IntRange as AndroidIntRange

For AndroidX:

import androidx.annotation.IntRange as AndroidIntRange

and use it like this:

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

edited Jun 19, 2020 at 20:21

answered Feb 14, 2019 at 19:21

Willi Mentzel

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1 Comment

Sofien Rahmouni Over a year ago

for AndroidX you must import androidx.annotation.IntRange as AndroidIntRange developer.android.com/reference/kotlin/androidx/annotation/…

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