GPS time rollover compensation for broken devices
Dennis GuseEvery 19.7 years aka every 1024 weeks the week counter in GPS transmission has an overflow. This is how to apply a fix if the hardware did not got a software update.
/**
* 1. Ancient fix for phones that do not set the time in {@link android.location.Location}.
* 2. Fix for GPS time rollover happening every 19.7 years: https://en.wikipedia.org/wiki/GPS_Week_Number_Rollover
*/
public static void fixTime(@NonNull Location trackPoint) {
if (trackPoint.getTime() == 0L) {
Log.w(TAG, "Time of provided location was 0. Using current time.");
trackPoint.setTime(System.currentTimeMillis());
return;
}
{
long timeDiff = Math.abs(trackPoint.getTime() - System.currentTimeMillis());
if (timeDiff > 1023 * UnitConversions.ONE_WEEK_MS) {
Log.w(TAG, "GPS week rollover.");
trackPoint.setTime(trackPoint.getTime() + 1024 * UnitConversions.ONE_WEEK_MS);
}
}
}