Transform an ImageView into circular shape, works with Picasso

CircleImageTransforation.md

Using Picasso with a circular ImageView

With this helper class you can transform your ordinary ImageView into ciruclar shape using Picasso library.

###Include this class into your project:

package com.<YOUR-PACKAGE-NAME>
	
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
	
import com.squareup.picasso.Transformation;
	
/**
* Transform an ImageView into Circular shape
*/
public class ImageCircleTransformation 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/2f;
		canvas.drawCircle(r, r, r, paint);
		
		squaredBitmap.recycle();
		return bitmap;
	}

	@Override
	public String key() {
	return ImageCircleTransformation.class.getSimpleName();
	}
}

Usage example

Picasso.with(context)
       .load(imageUrl)
       .transform(new ImageCircleTransformation())
       .into(yourRegularImageView);

ImageCircleTransformation.java

package com.<YOUR-PACKAGE-NAME>;

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

import com.squareup.picasso.Transformation;

/**
 * Transform an ImageView into Circular shape with Picasso
 */
public class ImageCircleTransformation 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/2f;
        canvas.drawCircle(r, r, r, paint);

        squaredBitmap.recycle();
        return bitmap;
    }

    @Override
    public String key() {
        return ImageCircleTransformation.class.getSimpleName();
    }
}