java 如何以 KB 为单位获取保存在字节数组中的图像的大小
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How to get size of an image that is held in a byte array in KB
提问by Chandra Sekhar
I want to find out the size of an image that is held in a byte array in KB
我想找出以 KB 为单位的字节数组中保存的图像的大小
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mPicture);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
byte[] b = baos.toByteArray();
The following logs display two different results for an image that is 11.7KB:
以下日志显示11.7KB图像的两种不同结果：
Log.d(TAG, "bm size: " + bm.getByteCount()/1024); // 942
Log.d(TAG, "baos size: " + baos.size()/1024); // 81
Log.d(TAG, "byte size: " + b.length/1024); // 81
Which is the correct result or how do I get the correct result?? Any help is appreciated.
哪个是正确的结果或者我如何得到正确的结果？任何帮助表示赞赏。
回答by Chandra Sekhar
bm.getByteCount()/1024 // 942is the original size of your image
bm.getByteCount()/1024 // 942是图像的原始尺寸
baos.size()/1024 // 81is the size after the image has been compressed
baos.size()/1024 // 81是图片压缩后的大小
The first gives the size of bitmap which represents the original image resourcebut the next two give the size of the stream or the byte array representing the compressedone. So the first one returns a bigger value than the next two.
第一个给出表示原始图像资源的位图的大小，但接下来的两个给出流的大小或表示压缩的字节数组。所以第一个返回比接下来两个更大的值。
