72 lines
2.3 KiB
Java
72 lines
2.3 KiB
Java
package eu.siacs.conversations.ui.util;
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import android.location.Location;
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import org.osmdroid.util.GeoPoint;
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import eu.siacs.conversations.Config;
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public final class LocationHelper {
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/**
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* Parses a lat long string in the form "lat,long".
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*
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* @param latlong A string in the form "lat,long"
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* @return A GeoPoint representing the lat,long string.
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* @throws NumberFormatException If an invalid lat or long is specified.
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*/
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public static GeoPoint parseLatLong(final String latlong) throws NumberFormatException {
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if (latlong == null || latlong.isEmpty()) {
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return null;
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}
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final String[] parts = latlong.split(",");
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if (parts[1].contains("?")) {
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parts[1] = parts[1].substring(0, parts[1].indexOf("?"));
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}
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return new GeoPoint(Double.valueOf(parts[0]), Double.valueOf(parts[1]));
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}
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private static boolean isSameProvider(final String provider1, final String provider2) {
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if (provider1 == null) {
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return provider2 == null;
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}
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return provider1.equals(provider2);
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}
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public static boolean isBetterLocation(final Location location, final Location prevLoc) {
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if (prevLoc == null) {
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return true;
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}
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// Check whether the new location fix is newer or older
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final long timeDelta = location.getTime() - prevLoc.getTime();
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final boolean isSignificantlyNewer = timeDelta > Config.Map.LOCATION_FIX_SIGNIFICANT_TIME_DELTA;
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final boolean isSignificantlyOlder = timeDelta < -Config.Map.LOCATION_FIX_SIGNIFICANT_TIME_DELTA;
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final boolean isNewer = timeDelta > 0;
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if (isSignificantlyNewer) {
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return true;
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} else if (isSignificantlyOlder) {
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return false;
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}
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// Check whether the new location fix is more or less accurate
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final int accuracyDelta = (int) (location.getAccuracy() - prevLoc.getAccuracy());
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final boolean isLessAccurate = accuracyDelta > 0;
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final boolean isMoreAccurate = accuracyDelta < 0;
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final boolean isSignificantlyLessAccurate = accuracyDelta > 200;
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// Check if the old and new location are from the same provider
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final boolean isFromSameProvider = isSameProvider(location.getProvider(), prevLoc.getProvider());
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// Determine location quality using a combination of timeliness and accuracy
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if (isMoreAccurate) {
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return true;
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} else if (isNewer && !isLessAccurate) {
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return true;
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} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
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return true;
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}
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return false;
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}
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} |