常用方法(2)------根据图片的url路径获得Bitmap对象

coding过程中会遇到将本地的图片的物理路径转化为Bitmap，可使用下面的方法：

/**     * @param path:图片的物理路径     * @param display_width：设置图片的宽     * @param display_height：设置图片的高     * @return     * @throws Exception     */    private Bitmap decodeBitmap(String path,float display_width,float display_height) throws Exception {        if (Float.compare(display_width,0.0f) == 0 || Float.compare(display_width,0.0f) == 0) {            throw new Exception("图片的宽高均不能为0！");        }        BitmapFactory.Options op = new BitmapFactory.Options();        //inJustDecodeBounds        //If set to true, the decoder will return null (no bitmap), but the out…        op.inJustDecodeBounds = true;        Bitmap bmp = BitmapFactory.decodeFile(path, op); //获取尺寸信息        //获取比例大小        int wRatio = (int)Math.ceil(op.outWidth/display_width);        int hRatio = (int)Math.ceil(op.outHeight/display_height);        //如果超出指定大小，则缩小相应的比例        if(wRatio > 1 && hRatio > 1){            if(wRatio > hRatio){                op.inSampleSize = wRatio;            }else{                op.inSampleSize = hRatio;            }        }        op.inJustDecodeBounds = false;        bmp = BitmapFactory.decodeFile(path, op);        return bmp;    }

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