coding過程中會遇到將本地的圖片的物理路徑轉化為Bitmap，可使用下面的方法：

/**
     * @param path:圖片的物理路徑
     * @param display_width：設定圖片的寬
     * @param display_height：設定圖片的高
     * @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("圖片的寬高均不能為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); //獲取尺寸資訊
        //獲取比例大小
        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，則縮小相應的比例
        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;
    }