Make ImageView with Round Corner Using picasso

You can use this class to make rounded corners rectangle image view with Picasso, use it like this

 Picasso.with(activity).load(url).transform(new RoundedCornersTransform(this)).into(imageView);

Here is the class RoundedCornersTransform.

package com.demo.picasso;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;

import com.squareup.picasso.Transformation;


public class RoundedCornersTransform implements Transformation {
@Override
public Bitmap transform(Bitmap source) {
    int size = Math.min(source.getWidth(), source.getHeight());

    int x = (source.getWidth() - size) / 2;
    int y = (source.getHeight() - size) / 2;

    Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
    if (squaredBitmap != source) {
        source.recycle();
    }

    Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());

    Canvas canvas = new Canvas(bitmap);
    Paint paint = new Paint();
    BitmapShader shader = new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
    paint.setShader(shader);
    paint.setAntiAlias(true);

    float r = size / 8f;
    canvas.drawRoundRect(new RectF(0, 0, source.getWidth(), source.getHeight()), r, r, paint);
    squaredBitmap.recycle();
    return bitmap;
}

@Override
public String key() {
    return "rounded_corners";
  }
}

You can use RoundedCornersTransformation class of picasso-transformations library.

Example :

final int radius = 5;
final int margin = 5;
final Transformation transformation = new RoundedCornersTransformation(radius, margin);
Picasso.with(activity).load(url).transform(transformation).into(imageView);

I am using this transformation: https://gist.github.com/julianshen/5829333

Picasso.with(activity).load(url).transform(new CircleTransform()).into(imageView);