Android P PreviewImageDecoder를 사용할 수 있습니다.

Android Developers Blog: Previewing Android P

ImageDecoder | Android Developers

Android P gives you an easier way to decode images to bitmaps or drawables -- ImageDecoder, which deprecates BitmapFactory.

이미지 표시

val uri = Uri.parse("android.resource://${packageName}/drawable/image")
val source = ImageDecoder.createSource(contentResolver, uri)
val bitmap = ImageDecoder.decodeBitmap(source)
imageView.setImageBitmap(bitmap)

drawable를 URI로 읽습니다.

android - Get URI from drawable image - Stack Overflow

크기 조정

val uri = Uri.parse("android.resource://${packageName}/drawable/image")
val source = ImageDecoder.createSource(contentResolver, uri)
val bitmap = ImageDecoder.decodeBitmap(source, { decoder, info, source ->
    decoder.setResize(300, 300)
})
imageView.setImageBitmap(bitmap)

decode...에서 호출을 지정하면decorder에서 크기 조정 등을 할 수 있습니다.

가공

val uri = Uri.parse("android.resource://${packageName}/drawable/image")
val source = ImageDecoder.createSource(contentResolver, uri)
val bitmap = ImageDecoder.decodeBitmap(source, { decoder, info, source ->
    decoder.setResize(300, 300)
    decoder.setPostProcessor { canvas ->
        val path = Path()
        path.fillType = Path.FillType.INVERSE_EVEN_ODD
        path.addCircle((canvas.width/2).toFloat(), (canvas.height/2).toFloat(), (canvas.width/2).toFloat(), Path.Direction.CW)

        val paint = Paint()
        paint.isAntiAlias = true
        paint.color = Color.TRANSPARENT
        paint.xfermode = PorterDuffXfermode(PorterDuff.Mode.SRC)

        canvas.drawPath(path, paint)

        return@setPostProcessor PixelFormat.TRANSLUCENT
    }
})
imageView.setImageBitmap(bitmap)

읽은 이미지setPostProcessor를 가공할 수 있습니다.

이렇게 둥근 커팅 등.
사용한 이미지
Charlesjsharp/Cassius blue (Leptotes cassius theonus), Cuba/CC BY-SA 4.0
File:Cassius blue (Leptotes cassius theonus) underside.JPG - Wikimedia Commons