extension function for loading image with picasso..

ImageView.kt

fun ImageView.loadImage(url: String ="", @DrawableRes drawable: Int = R.mipmap.ic_launcher, placeHolderUrl: String = "", @NonNull placeHolderDrawable: Int = R.mipmap.ic_launcher, circular: Boolean = false) {

    val defUrl = ""
    @DrawableRes
    val defDrawable = R.mipmap.ic_launcher

    when {
        //Displaying image from Url
        url.isNotEmpty() && circular -> Picasso.get().load(url).placeholder(placeHolderDrawable).transform(CircleTransform()).into(this);
        url.isNotEmpty() && !circular -> Picasso.get().load(url).placeholder(placeHolderDrawable).into(this)

        //Displaying drawable Image
        url.isEmpty() && drawable != defDrawable && circular -> Picasso.get().load(drawable).placeholder(placeHolderDrawable).transform(CircleTransform()).into(this)
        url.isEmpty() && drawable != defDrawable && !circular -> Picasso.get().load(drawable).placeholder(placeHolderDrawable).into(this)

        //Displaying placeholder Url
        url.isEmpty() && drawable == defDrawable && placeHolderUrl != defUrl && circular -> Picasso.get().load(placeHolderUrl).placeholder(placeHolderDrawable).transform(CircleTransform()).into(this)
        url.isEmpty() && drawable == defDrawable && placeHolderUrl != defUrl && !circular -> Picasso.get().load(placeHolderUrl).placeholder(placeHolderDrawable).into(this)

        //Displaying placeholder Drawable
        url.isEmpty() && drawable == defDrawable && placeHolderUrl.isEmpty() && circular -> Picasso.get().load(placeHolderDrawable).transform(CircleTransform()).into(this)
        url.isEmpty() && drawable == defDrawable && placeHolderUrl.isEmpty() && !circular -> Picasso.get().load(placeHolderDrawable).into(this)

        else -> {
            if (circular) Picasso.get().load(defDrawable).transform(CircleTransform()).into(this)
            else Picasso.get().load(defDrawable).into(this)
        }
    }
}