Android中按图片像素缩放图片的一种方法

try {  
            BitmapFactory.Options options = new BitmapFactory.Options();  
            options.inJustDecodeBounds = true;//设置true后，位图并没有真正加载到内容，仅仅获取所必要的参数  
            mBitmap = BitmapFactory.decodeFile(path,options);//path为文件路径  
            options.inJustDecodeBounds = false;  
           int be = (int)(options.outHeight/ (float)200);//设置打开图片高度为200像素  
            if (be <= 0)  
                be = 1;  
            options.inSampleSize = be;  
  
            mDstBmp= BitmapFactory.decodeFile(path,options);
????????   options.inJustDecodeBounds = false;//真正将图片加载到内存 
  
        } catch (Exception e) {  
            Toast.makeText(getApplicationContext(),"图片打开错误",Toast.LENGTH_SHORT).show();  
        }