内存加载图片压缩 BitmapFactory.Options

/***imgUrl 要压缩的力图片地址**/public Bitmap CompressedImage(String imgUrl) {      BitmapFactory.Options options = new BitmapFactory.Options();      options.inJustDecodeBounds = true;  //为true时只加载图片的宽高，不加载实际内容options.inPreferredConfig =Bitmap.Config.RGB_565; BitmapFactory.decodeFile(imgUrl, options);//int W = options.outWidth ;//int H = options.outHeight ;
options.inSampleSize =  5; //inSampleSize=5，载入的压缩图是原图的1/4。因为inSampleSize只能是2的整数次幂，如果不是，就向下取最大的2的整数次幂
      options.inJustDecodeBounds = false; 
      return BitmapFactory.decodeFile(imgUrl, options); 
  }