Writing EXIF metadata to images in Android

问题:

I want to store some metadata in images. My camera application gives me a bitmap, which I store in the storage (MediaStore) device. In addition to this, I want to add a few tags to the picture in its metadata. I think EXIF is a good way of doing this. But I couldn't find good references on how to do this.

If there are some tools to achieve this task in Android programming, please let me know.

Thanks

回答1:

Ok, Somebody (offline) pointed me to a useful resource. The ExifInterface looks like what I was searching for. Android-er has a post demonstrating how to read EXIF metadata in Android and I think writing should not be very different.

I don't know, but can we EXIF to write arbitrary metadata, ie. other than those specified in the ExifInterface documentation (like latitude, longitude, flash etc). If not, what could be a preferred method of writing arbitrary metadata to image files?

Thanks

回答2:

public static void writeFile (File photo, double latitude, double longitude) throws IOException{
    ExifInterface exif = null;

    try{
        Log.v("latiDouble", ""+latitude);
        Log.v("longiDouble", ""+longitude);
        exif = new ExifInterface(photo.getCanonicalPath());
        if (exif != null) { 
            double latitu = latitude;
            double longitu = longitude;
            double alat = Math.abs(latitu);
            double along = Math.abs(longitu);
            String stringLati = convertDoubleIntoDegree(alat);
            String stringLongi = convertDoubleIntoDegree(along);
            exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, stringLati);
            exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, stringLongi);
            Log.v("latiString", ""+ stringLati);
            Log.v("longiString", ""+ stringLongi);
            exif.saveAttributes();
            String lati = exif.getAttribute (ExifInterface.TAG_GPS_LATITUDE);
            String longi = exif.getAttribute (ExifInterface.TAG_GPS_LONGITUDE);
            Log.v("latiResult", ""+ lati);
            Log.v("longiResult", ""+ longi);
        } 
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

I copied the answer from here