CircleTransform for Picasso

CircleCropTransformation.java

/*
 * Copyright 2014 Owais Idris
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.picassodemo;

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

import com.squareup.picasso.Transformation;

/**
 * Created by owais on 30/12/15.
 */
public class CircleCropTransformation implements Transformation {

    int targetWidth;

    public CircleCropTransformation(int targetWidth) {

        this.targetWidth = targetWidth;
    }

    @Override
    public Bitmap transform(Bitmap source) {
        int targetWidth = this.targetWidth;
        double aspectRatio = (double) source.getHeight() / (double) source.getWidth();
        int targetHeight = (int) (targetWidth * aspectRatio);
        Bitmap sourceB = Bitmap.createScaledBitmap(source, targetWidth, targetHeight, false);
        if (sourceB != source) {
            // Same bitmap is returned if sizes are the same
            source.recycle();
        }
        int size = Math.min(sourceB.getWidth(), sourceB.getHeight());

        int x = (sourceB.getWidth() - size)/ 2;
        int y = (sourceB.getHeight() - size)/2;
        Bitmap squaredBitmap = Bitmap.createBitmap(sourceB, x, y, size, size);
        if (squaredBitmap != sourceB) {
            sourceB.recycle();
        }
        Bitmap bitmap = Bitmap.createBitmap(size, size, sourceB.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);
        /*canvas.drawRoundRect(new RectF(0,0, 800, 800), r/2, r/2,paint);*/
        sourceB.recycle();
        return bitmap;
    }

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

This is Circle-transform but added Re-sizing with maintaining aspect ratio. This makes your RecyclerView faster and non lagging.