I think this bug may be related:
http://code.google.com/p/android/issues/detail?id=7369
The Camera assigns DATE_TAKEN=currentTimeMillis when it inserts the
photo
in the MediaProvider, but then the MediaScanner subsequently reads the
EXIF
info from the photo and updates the DATE_TAKE.
Problem is: the EXIF date doesn't have millis, just seconds. (Nor does
it
have a timezone, but that shouldn't be an issue if the phone and its
camera
share the same clock.)
On Apr 26, 9:27 pm, skan95 wrote:
> Dear all.
>
> Currently, Eclair 2.1 might have a problem when calculating image
> taken time during media scanning.
> When an image is captured in Camera, the taken time is written
> correctly in media DB.
> But if the device is booted, the image taken time is changed from
> original taken time to the time added as timezone.
>
> # \frameworks\base\media\java\android\media\ExifInterface.java.
>
> public long getDateTime() {
> String dateTimeString = mAttributes.get(TAG_DATETIME);
>
> Log.e(TAG, "DATETIME " + dateTimeString);
>
> if (dateTimeString == null) return -1;
>
> ParsePosition pos = new ParsePosition(0);
> try {
> Date date = sFormatter.parse(dateTimeString+"Z", pos);
> if (date == null) return -1;
> Log.e(TAG, "Date = "+date + ", getTime = "+date.getTime());
> return date.getTime();
> } catch (IllegalArgumentException ex) {
> return -1;
> }
> }
>
> 04-27 13:16:59.690: ERROR/ExifInterface(1531): DATETIME 2010:04:26
> 22:44:15
> 04-27 13:16:59.690: ERROR/ExifInterface(1531): Date = Tue Apr 27
> 07:44:15 Asia/Seoul 2010, getTime = 1272321855000
> ==> 9 hours is added to the original taken time.
>
> But, if same code is used in application, the return value is
> different from the value gotten from framework.
>
> ExifInterface exif = null;
> private static SimpleDateFormat sFormatter;
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
>
> try{
> exif = new ExifInterface("/sdcard/DCIM/Camera/IMG001.JPG");
> }catch(IOException ex){
>
> }
>
> if(exif != null){
> String date = exif.getAttribute("DateTime");
> sFormatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss");
> ParsePosition pos = new ParsePosition(0);
> try {
> Date dateFormat = sFormatter.parse(date, pos);
> Log.e(TAG, "Date = "+dateFormat + ", time =
> "+dateFormat.getTime());
> } catch (IllegalArgumentException ex) {
>
> }
> }
> }
>
> 04-27 11:36:32.165: ERROR/TimeZoneTest(6954): Date = 2010:04:26
> 22:44:15
> 04-27 11:36:32.175: ERROR/TimeZoneTest(6954): Date = Mon Apr 26
> 22:44:15 Asia/Seoul 2010, time = 1272289455000
>
> So, if SD card is detached and attached again, the taken time is
> changed as timezone time.
>
> If anyone knows or experiences, let me know how to deal with this
> case.
>
> Thanks.
>
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