This class is used to display the profile image in circular fashion.

CircleTransform.java

//https://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/
public class CircleTransform extends BitmapTransformation {
    public CircleTransform(Context context) {
        super(context);
    }
 
    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return circleCrop(pool, toTransform);
    }
 
    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;
 
        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;
 
        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
 
        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }
 
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }
 
    @Override
    public String getId() {
        return getClass().getName();
    }
}