App distance traveled on trail trace.

app/src/main/java/fr/chteufleur/mytrackingdog/MainActivity.java

@@ -22,6 +22,7 @@ import android.view.MenuItem;
 import android.view.Surface;
 import android.view.View;
 import android.view.WindowManager;
+import android.widget.TextView;
 import android.widget.Toast;
 
 import org.osmdroid.api.IMapController;
@@ -71,6 +72,10 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
     private FloatingActionButton start_stop_trace;
     private FloatingActionButton start_stop_dog_trace;
     private FloatingActionButton add_object;
+    private TextView textViewCurrentLocation;
+
+    private MyLocation lastLocation = null;
+    private int distance = 0;
 
     @RequiresApi(api = Build.VERSION_CODES.M)
     protected void checkPermissions() {
@@ -148,6 +153,9 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
             }
         });
 
+        textViewCurrentLocation = findViewById(R.id.textViewCurrentLocation);
+        textViewCurrentLocation.setVisibility(View.GONE);
+
         if (serviceGps == null) {
             serviceGps = new ServiceGps();
             serviceGps.addObserver(this);
@@ -160,6 +168,7 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
             this.start_stop_trace.setImageResource(R.drawable.ic_stop);
             this.add_object.setVisibility(View.VISIBLE);
             this.start_stop_dog_trace.setVisibility(View.GONE);
+            this.textViewCurrentLocation.setVisibility(View.VISIBLE);
         } else {
             this.start_stop_trace.setImageResource(R.drawable.ic_play);
             this.add_object.setVisibility(View.GONE);
@@ -315,6 +324,7 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
                         serviceGps.importGpxTrace(new File(data.getStringExtra(FilePicker.EXTRA_FILE_PATH)));
                         updateDogTrace();
                         updateTrailTrace();
+                        calculTrailDistance();
                         for (MyLocation loc: serviceGps.getListGeoPointObjects()) {
                             addMarker(new GeoPoint(loc.getLatitude(), loc.getLongitude(), loc.getAltitude()));
                         }
@@ -384,6 +394,21 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
         }
     }
 
+    private void calculTrailDistance() {
+        List<MyLocation> listLoc = serviceGps.getListGeoPointTraceur();
+        MyLocation last = null;
+        int distance = 0;
+        for (MyLocation loc: listLoc) {
+            if (last != null) {
+                distance += loc.distanceTo(last);
+            }
+            last = loc;
+        }
+        if (distance != 0) {
+            updateDistance(distance);
+        }
+    }
+
     private void updateDogTrace() {
         Polyline line = new Polyline(map);
         line.setTitle(Gpx.DOG_TRACE_NAME);
@@ -418,6 +443,11 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
                     map.getController().setCenter(currentPoint);
                     if (serviceGps.isTraceurActivated()) {
                         updateTrailTrace();
+                        if (lastLocation != null) {
+                            distance += loc.distanceTo(lastLocation);
+                            updateDistance(distance);
+                        }
+                        lastLocation = loc;
                     } else if (serviceGps.isDogActivated()) {
                         updateDogTrace();
                     }
@@ -440,4 +470,9 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
         }
         return ret;
     }
+
+    private void updateDistance(int distance) {
+        this.textViewCurrentLocation.setText("Distance: "+distance+"m");
+        this.textViewCurrentLocation.setVisibility(View.VISIBLE);
+    }
 }

app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocation.java

@@ -68,6 +68,19 @@ public class MyLocation {
         return this.bearing;
     }
 
+    public int distanceTo(MyLocation loc) {
+        double earthRadius = 6371000; //meters
+        double dLat = Math.toRadians(loc.latitude-latitude);
+        double dLng = Math.toRadians(loc.longitude-longitude);
+        double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
+                Math.cos(Math.toRadians(latitude)) * Math.cos(Math.toRadians(loc.latitude)) *
+                        Math.sin(dLng/2) * Math.sin(dLng/2);
+        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
+        float dist = (float) (earthRadius * c);
+
+        return (int) dist;
+    }
+
 
     public String toWayPoint() {
         String ret = "<wpt lat=\""+getLatitude()+"\" lon=\""+getLongitude()+"\">";

app/src/main/res/layout/main.xml

@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
-
 <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
@@ -7,7 +6,6 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-
     <android.support.design.widget.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
@@ -20,6 +18,14 @@
             android:background="?attr/colorPrimary"
             app:popupTheme="@style/AppTheme.PopupOverlay" />
 
+        <TextView android:id="@+id/textViewCurrentLocation"
+            android:layout_width="fill_parent"
+            android:text="PLACEHOLDER"
+            android:textAlignment="center"
+            android:gravity="center"
+            android:textColor="@android:color/white"
+            android:background="#77000000"
+            android:layout_height="wrap_content"></TextView>
     </android.support.design.widget.AppBarLayout>
 
     <org.osmdroid.views.MapView android:id="@+id/map"