Android 使用图片铺满某个区域

/**
     * 使用图片铺满某个区域，返回整个铺满的图片
     * @param src 原图片
     * @param rect 要铺满的区域大小
     */
    public static Bitmap getTile(Bitmap src, Size rect){
        int w = src.getWidth() ; 
        int h = src.getHeight() ; 
        int column = (int) Math.ceil( ((float)rect.width)/w ) ; 
        int row = (int) Math.ceil( ((float)rect.height)/h ) ;
        Bitmap nb = Bitmap.createBitmap(rect.width, rect.height, src.getConfig()) ;
        Canvas canvas = new Canvas(nb) ;
        Paint paint = new Paint() ;
        paint.setColor(0xff000000);
        for (int i = 0; i < row; i++) {
            for (int j = 0; j < column; j++) {
                canvas.drawBitmap(src, j*w, i*h, paint);
            }
        }
        return nb ; 
    }