If you are using the Picasso library to load images on Android and you want to show a circular image then use Picasso Transformations library to transform the image before loading.
implementation 'jp.wasabeef:picasso-transformations:2.2.1'
You can use the CropCircleTransformation
to get a rounded image which you can pass to the view.
Picasso.with(mContext).load(R.drawable.demo)
.transform(new CropCircleTransformation())
.into(holder.image);
P.S. The library also has other useful image transformations which you can use. Check them out here: Picasso Transformations