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Location service: only request a fix once every 5 minutes

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This should prevent the device from draining battery like crazy.

This is not the same as the interval at which we record fixes - getting a
fix every 5 minutes gives us a better chance to notice when we moved the
minimum distance.

Also add some more comments to the code that does the actual handling of
storing the data.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2015-11-13 12:01:01 -08:00
parent fb06d27593
commit 6124842b0c
1 changed files with 4 additions and 1 deletions
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5
qt-mobile/gpslocation.cpp
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@ -17,6 +17,7 @@ GpsLocation::GpsLocation(QObject *parent)
QString msg = QString("have position source %1").arg(gpsSource->sourceName());
connect(gpsSource, SIGNAL(positionUpdated(QGeoPositionInfo)), this, SLOT(newPosition(QGeoPositionInfo)));
connect(gpsSource, SIGNAL(updateTimeout()), this, SLOT(updateTimeout()));
gpsSource->setUpdateInterval(5 * 60 * 1000); // 5 minutes so the device doesn't drain the battery
} else {
status("don't have GPS source");
}
@ -38,6 +39,7 @@ void GpsLocation::serviceEnable(bool toggle)
}
}
// these two need to become configurable
#define MINTIME 600
#define MINDIST 200
@ -53,7 +55,8 @@ void GpsLocation::newPosition(QGeoPositionInfo pos)
lastCoord.setLongitude(geoSettings->value(QString("gpsFix%1_lon").arg(nr)).toInt() / 1000000.0);
time_t lastTime = geoSettings->value(QString("gpsFix%1_time").arg(nr)).toULongLong();
}
// if we have no record stored or if at least 10 minutes have passed or we moved at least 200m
// if we have no record stored or if at least the configured minimum
// time has passed or we moved at least the configured minimum distance
if (!nr || pos.timestamp().toTime_t() > lastTime + MINTIME || lastCoord.distanceTo(pos.coordinate()) > MINDIST) {
geoSettings->setValue("count", nr + 1);
geoSettings->setValue(QString("gpsFix%1_time").arg(nr), pos.timestamp().toTime_t());