Add minimum GPS accuracy preference for logging

app/src/main/java/net/osmtracker/osm/OpenStreetMapConstants.java

@@ -6,6 +6,7 @@ public class OpenStreetMapConstants {
 	private static final String OSM_API_URL_DEV = "https://master.apis.dev.openstreetmap.org";
 	private static final String OSM_API_URL_PROD = "https://www.openstreetmap.org";
 	private static final String OSM_API_URL = (DEV_MODE) ? OSM_API_URL_DEV : OSM_API_URL_PROD;
+	public static final String PREFS_GPS_MIN_ACCURACY = "gps_min_accuracy";
 
 	public static class Api {
 

app/src/main/java/net/osmtracker/service/gps/GPSLogger.java

@@ -10,6 +10,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.location.Location;
 import android.location.LocationListener;
@@ -31,6 +32,7 @@
 import net.osmtracker.db.TrackContentProvider;
 import net.osmtracker.listener.PressureListener;
 import net.osmtracker.listener.SensorListener;
+import net.osmtracker.osm.OpenStreetMapConstants;
 
 /**
  * GPS logging service.
@@ -56,6 +58,14 @@ public class GPSLogger extends Service implements LocationListener {
 	 * Is GPS enabled ?
 	 */
 	private boolean isGpsEnabled = false;
+	/**
+	 * Minimum accuracy in meters for starting
+	 */
+	private int minAccuracy = 0;
+	/**
+	 * Precision of the accuracy in meters is satisfied ?
+	 */
+	private boolean isAccuracySatisfied = false;
 
 	/**
 	 * Use barometer yes/no ?
@@ -250,6 +260,18 @@ public void onCreate() {
 		use_barometer = PreferenceManager.getDefaultSharedPreferences(this.getApplicationContext()).getBoolean(
 				OSMTracker.Preferences.KEY_USE_BAROMETER, OSMTracker.Preferences.VAL_USE_BAROMETER);
 
+		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this.getApplicationContext());
+		try {
+			minAccuracy = Integer.parseInt(prefs.getString(OpenStreetMapConstants.PREFS_GPS_MIN_ACCURACY, "0"));
+		} catch (NumberFormatException e) {
+			minAccuracy = 0;
+		}
+		// minimum precision enabled 
+		if (minAccuracy > 0) {
+			isAccuracySatisfied = false;
+		} else {
+			isAccuracySatisfied = true;
+		}
 		// Register our broadcast receiver
 		IntentFilter filter = new IntentFilter();
 		filter.addAction(OSMTracker.INTENT_TRACK_WP);
@@ -336,7 +358,20 @@ private void stopTrackingAndSave() {
 	}
 
 	@Override
-	public void onLocationChanged(Location location) {		
+	public void onLocationChanged(Location location) {
+		if (location == null){
+			return;
+		}
+		// Wait for minimum accuracy before starting
+		if(!isAccuracySatisfied){
+			if(location.hasAccuracy() && location.getAccuracy() <= minAccuracy){
+				// Precision achieved we unlocked the door and began recording this one and the following ones.
+				isAccuracySatisfied = true;
+			}
+			else {
+				return;
+			}
+		}
 		// We're receiving location, so GPS is enabled
 		isGpsEnabled = true;
 

app/src/main/res/values/strings-preferences.xml

@@ -27,6 +27,9 @@
   <string name="prefs_gps_logging_min_distance_summary">Min. distance between track points in meters, use 0 for the shortest possible</string>
   <string name="prefs_gps_logging_min_distance_meters">meters</string>
   <string name="prefs_gps_logging_min_distance_empty">Min. distance between track points cannot be empty</string>
+  <string name="prefs_gps_min_accuracy">GPS minimum accuracy</string>
+  <string name="prefs_gps_min_accuracy_summary">Wait until accuracy is better than this value (in meters) to start recording. 0 to disable.</string>
+  <string name="prefs_gps_min_accuracy_dialog_title">Enter minimum accuracy (meters)</string>
   <string name="prefs_ui">User interface</string>
   <string name="prefs_ui_picture_source">Default photo source</string>
   <string name="prefs_ui_picture_source_summary">Take photos from camera or gallery?</string>

app/src/main/res/xml/preferences.xml

@@ -67,6 +67,14 @@
             app:key="gps.logging.min_distance"
             app:summary="@string/prefs_gps_logging_min_distance_summary"
             app:title="@string/prefs_gps_logging_min_distance" />
+      <EditTextPreference
+            android:key="gps_min_accuracy"
+            android:defaultValue="0"
+            android:title="@string/prefs_gps_min_accuracy"
+            android:summary="@string/prefs_gps_min_accuracy_summary"
+            android:dialogTitle="@string/prefs_gps_min_accuracy_dialog_title"
+            android:inputType="number"
+            android:persistent="true" />
     </PreferenceCategory>
 
     <PreferenceCategory app:title="@string/prefs_output">