Android图片缩放

/**
     * 图片缩放，返回缩放后的图片
     * @param src 原图
     * @param scale 缩放倍数
     */
    public static Bitmap scaleImage(Bitmap src, float scale){
        int w = src.getWidth() ; 
        int h = src.getHeight() ; 
        int nw = (int) (w * scale) ; 
        int nh = (int) (h * scale) ;
        Bitmap nb = Bitmap.createBitmap(nw, nh, src.getConfig()) ;
        Canvas canvas = new Canvas(nb) ;
        Rect srcRect = new Rect(0, 0, w, h) ; 
        Rect dstRect = new Rect(0, 0, nw, nh) ; 
        Paint paint = new Paint() ;
        paint.setColor(0xff000000);
        canvas.drawBitmap(src, srcRect, dstRect, paint);
        return nb ; 
    }