From 8cf20a8222ee1102edbe47ebec312862042bb0c9 Mon Sep 17 00:00:00 2001
From: Christian Schneppe <christian@pix-art.de>
Date: Sun, 7 Jan 2018 22:32:23 +0100
Subject: reworked location services from GoogleMap to OSM

---
 .../de/pixart/messenger/utils/LocationHelper.java  | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/main/java/de/pixart/messenger/utils/LocationHelper.java

(limited to 'src/main/java/de/pixart/messenger/utils/LocationHelper.java')

diff --git a/src/main/java/de/pixart/messenger/utils/LocationHelper.java b/src/main/java/de/pixart/messenger/utils/LocationHelper.java
new file mode 100644
index 000000000..85226bcd1
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/utils/LocationHelper.java
@@ -0,0 +1,51 @@
+package de.pixart.messenger.utils;
+
+import android.location.Location;
+
+import de.pixart.messenger.Config;
+
+public final class LocationHelper {
+    private static boolean isSameProvider(final String provider1, final String provider2) {
+        if (provider1 == null) {
+            return provider2 == null;
+        }
+        return provider1.equals(provider2);
+    }
+
+    public static boolean isBetterLocation(final Location location, final Location prevLoc) {
+        if (prevLoc == null) {
+            return true;
+        }
+
+        // Check whether the new location fix is newer or older
+        final long timeDelta = location.getTime() - prevLoc.getTime();
+        final boolean isSignificantlyNewer = timeDelta > Config.LOCATION_FIX_SIGNIFICANT_TIME_DELTA;
+        final boolean isSignificantlyOlder = timeDelta < -Config.LOCATION_FIX_SIGNIFICANT_TIME_DELTA;
+        final boolean isNewer = timeDelta > 0;
+
+        if (isSignificantlyNewer) {
+            return true;
+        } else if (isSignificantlyOlder) {
+            return false;
+        }
+
+        // Check whether the new location fix is more or less accurate
+        final int accuracyDelta = (int) (location.getAccuracy() - prevLoc.getAccuracy());
+        final boolean isLessAccurate = accuracyDelta > 0;
+        final boolean isMoreAccurate = accuracyDelta < 0;
+        final boolean isSignificantlyLessAccurate = accuracyDelta > 200;
+
+        // Check if the old and new location are from the same provider
+        final boolean isFromSameProvider = isSameProvider(location.getProvider(), prevLoc.getProvider());
+
+        // Determine location quality using a combination of timeliness and accuracy
+        if (isMoreAccurate) {
+            return true;
+        } else if (isNewer && !isLessAccurate) {
+            return true;
+        } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
+            return true;
+        }
+        return false;
+    }
+}
-- 
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