Make ImageView with Round Corner Using picasso

Question

I know there are lots of link available to make ImageView Round Corner. But I\'m Using Picasso Library for Image Loading.. I refer the link to get

Answer 1

Kotlin version of RoundCornerTransform based on @stevyhacker 's answer.

• Support rectangle instead of square image.
• No extra 3rd party library needed.

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import android.graphics.*
import com.squareup.picasso.Transformation

class RoundCornersTransform(private val radiusInPx: Float) : Transformation {

    override fun transform(source: Bitmap): Bitmap {
        val bitmap = Bitmap.createBitmap(source.width, source.height, source.config)
        val canvas = Canvas(bitmap)
        val paint = Paint(Paint.ANTI_ALIAS_FLAG or Paint.DITHER_FLAG)
        val shader = BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
        paint.shader = shader
        val rect = RectF(0.0f, 0.0f, source.width.toFloat(), source.height.toFloat())
        canvas.drawRoundRect(rect, radiusInPx, radiusInPx, paint)
        source.recycle()

        return bitmap
    }

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

}

Usage:

    Picasso.get()
        .load(imageUrl)
        .memoryPolicy(MemoryPolicy.NO_CACHE)
        .placeholder(R.drawable.image_placeholder)
        .transform(RoundCornersTransform(32.0f))
        .into(imageView, callback)