如何附加EXIF元数据在Android的序列化的Bitmap？ [英] How to attach EXIF metadata to a serialized Bitmap in Android?

问题描述

在Android的，解码时从手机上的照片的位图，在原有的EXIF数据丢失。我通过一个套接字发送此位图到我的服务器，并希望丢失的EXIF数据重新连接到所发送的数据。

In Android, when decoding a Bitmap from a photo on the phone, the EXIF data in the original gets lost. I am sending this Bitmap to my server via a socket and would like to re-attach the missing EXIF data to the data being sent.

我有一些code加载从MediaStore Bitmap对象和COM $ P $它psses在preparation字节数组它通过套接字发送：

I have some code that loads a Bitmap object from the MediaStore and compresses it to a byte array in preparation to send it over a socket:

Bitmap bitmap = ...
ByteArrayOutputStream stream = new ByteArrayOutputStream(bitmap);
bitmap.compress(CompressFormat.JPEG, 70, stream);
byte[] input = stream.toByteArray();

我想使用ExifInterface得到的EXIF元数据在原来的JPEG在SD卡上，并以某种方式添加到的方式传出的字节数组，我会能够提取一个JPEG与所有正确的EXIF在服务器端（希望无需在服务器上这样做）。到目前为止，我设法用ExifInterface读取所有EXIF数据：

I want to use the ExifInterface to get at the EXIF metadata in the original jpeg on the SD card and somehow add that to the outgoing byte array in a way that I'd be able to extract a jpeg with all the correct EXIF on the server side (hopefully without doing this on the server). So far, I managed to use the ExifInterface to read all EXIF data:

String path = ... //bitmap file path
ExifInterface exif = new ExifInterface(path);
... = exif.getAttribute(...)

编辑：理想情况下，我想找到不使用图书馆的解决方案。如果我能得到包含EXIF和prePEND原始的JPEG的字节数组的索引/追加这些字节由 bitmap.com preSS（产生的字节数组.. 。）这将是最好的。

推荐答案

由于 @Nick坎皮恩和< A HREF =htt​​p://commons.apache.org/sanselan/相对=nofollow> Sanselan 。

工作code：

ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.JPEG, 100, bos); //Bitmap object is your image
byte[] data = bos.toByteArray();

TiffOutputSet outputSet = null;

IImageMetadata metadata = Sanselan.getMetadata(new File(filepath)); // filepath is the path to your image file stored in SD card (which contains exif info)
JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
if (null != jpegMetadata)
{
    TiffImageMetadata exif = jpegMetadata.getExif();
    if (null != exif)
    {
        outputSet = exif.getOutputSet();
    }
}
if (null != outputSet)
{
    bos.flush();
    bos.close();
    bos = new ByteArrayOutputStream();
    ExifRewriter ER = new ExifRewriter();
    ER.updateExifMetadataLossless(data, bos, outputSet);
    data = bos.toByteArray(); //Update you Byte array, Now it contains exif information!
}

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