android: create circular image with picasso

Question

The question had been asked and there had been a promise made for the very version of Picasso that I am using: How do I send a circular bitmap to an ImageView using Picasso?

Answer 1

Here is what worked for me with Picasso v2.71828

class CircleTransform : Transformation {
override fun transform(source: Bitmap?): Bitmap? {
    if (source == null) {
        return source
    }

    var bitmap: Bitmap

    // since we cant transform hardware bitmaps create a software copy first
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && source.config == Bitmap.Config.HARDWARE) {
        val softwareCopy = source.copy(Bitmap.Config.ARGB_8888, true)
        if (softwareCopy == null) {
            return source
        } else {
            bitmap = softwareCopy
            source.recycle()
        }
    } else {
        bitmap = source
    }

    var size = bitmap.width
    // if bitmap is non-square first create square one
    if (size != bitmap.height) {
        var sizeX = size
        var sizeY = bitmap.height
        size = Math.min(sizeY, sizeX)
        sizeX = (sizeX - size) / 2
        sizeY = (sizeY - size) / 2

        val squareSource = Bitmap.createBitmap(bitmap, sizeX, sizeY, size, size)
        bitmap.recycle()
        bitmap = squareSource
    }

    val circleBitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888)
    val canvas = Canvas(circleBitmap)
    val paint = Paint()
    val shader = BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)

    paint.shader = shader
    paint.isAntiAlias = true
    val centerAndRadius = size / 2f
    canvas.drawCircle(centerAndRadius, centerAndRadius, centerAndRadius, paint)

    bitmap.recycle()
    return circleBitmap
}


override fun key(): String {
    return "circleTransformation()"
}

}