FixedWidth_VariableHeight_ImageResizing Transformation_Picasso

PicassoTransformation<2.4.0

com.squareup.picasso.Transformation transformation = new com.squareup.picasso.Transformation() {
            @Override
            public Bitmap transform(Bitmap source) {
                int targetWidth = yourview.getWidth();

                double aspectRatio = (double) source.getHeight() / (double) source.getWidth();
                int targetHeight = (int) (targetWidth * aspectRatio);
                Bitmap result = Bitmap.createScaledBitmap(source, targetWidth, targetHeight, false);
                if (result != source) {
                    // Same bitmap is returned if sizes are the same
                    source.recycle();
                }
                return result;
           }

            @Override
            public String key() {
                return "transformation" + " desiredWidth";
            }
        };