Add the current position on the map.

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

@@ -3,11 +3,14 @@ package fr.chteufleur.mytrackingdog;
 import android.Manifest;
 import android.content.Context;
 import android.content.pm.PackageManager;
+import android.location.LocationManager;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.support.annotation.RequiresApi;
 import android.support.v7.app.AppCompatActivity;
+import android.util.DisplayMetrics;
+import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.WindowManager;
@@ -18,9 +21,19 @@ import org.osmdroid.config.Configuration;
 import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
 import org.osmdroid.util.GeoPoint;
 import org.osmdroid.views.MapView;
+import org.osmdroid.views.overlay.mylocation.GpsMyLocationProvider;
+import org.osmdroid.views.overlay.mylocation.MyLocationNewOverlay;
+
+import fr.chteufleur.mytrackingdog.services.IServiceGps;
+import fr.chteufleur.mytrackingdog.services.ServiceGps;
 
 public class MainActivity extends AppCompatActivity {
 
+    public static final String TAG = "MainActivity";
+
+    private MyLocationNewOverlay mLocationOverlay;
+    private IServiceGps serviceGps = null;
+
     Context ctx = null;
     MapView map = null;
 
@@ -57,6 +70,10 @@ public class MainActivity extends AppCompatActivity {
             checkPermissions();
         }
 
+        if (serviceGps == null) {
+            serviceGps = new ServiceGps();
+        }
+
         //load/initialize the osmdroid configuration, this can be done
         ctx = getApplicationContext();
         Configuration.getInstance().load(ctx, PreferenceManager.getDefaultSharedPreferences(ctx));
@@ -84,10 +101,25 @@ public class MainActivity extends AppCompatActivity {
         mapController.setZoom(11.0);
         GeoPoint startPoint = new GeoPoint(45.0000, 5.0000);
         mapController.setCenter(startPoint);
+
+
+        final DisplayMetrics dm = ctx.getResources().getDisplayMetrics();
+        this.mLocationOverlay = new MyLocationNewOverlay(new GpsMyLocationProvider(ctx), map);
+        map.getOverlays().add(this.mLocationOverlay);
+        mLocationOverlay.enableMyLocation();
+        mLocationOverlay.enableFollowLocation();
+        mLocationOverlay.setOptionsMenuEnabled(true);
     }
 
     public void onResume(){
         super.onResume();
+
+        ((ServiceGps) serviceGps).setLocationManager((LocationManager) getSystemService(ctx.LOCATION_SERVICE));
+        serviceGps.start();
+
+        mLocationOverlay.enableFollowLocation();
+        mLocationOverlay.enableMyLocation();
+
         //this will refresh the osmdroid configuration on resuming.
         //if you make changes to the configuration, use
         //SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
@@ -99,6 +131,10 @@ public class MainActivity extends AppCompatActivity {
 
     public void onPause(){
         super.onPause();
+
+        mLocationOverlay.disableFollowLocation();
+        mLocationOverlay.disableMyLocation();
+
         //this will refresh the osmdroid configuration on resuming.
         //if you make changes to the configuration, use
         //SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
@@ -108,6 +144,13 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
+    public void onBackPressed() {
+        super.onBackPressed();
+        if (serviceGps != null) {
+            serviceGps.stop();
+        }
+    }
+
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
@@ -130,6 +173,8 @@ public class MainActivity extends AppCompatActivity {
         return super.onOptionsItemSelected(item);
     }
 
+
+
     @Override
     public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
         switch (requestCode) {

app/src/main/java/fr/chteufleur/mytrackingdog/services/IServiceGps.java

@@ -0,0 +1,8 @@
+package fr.chteufleur.mytrackingdog.services;
+
+public interface IServiceGps {
+
+    public void start();
+    public void stop();
+
+}

app/src/main/java/fr/chteufleur/mytrackingdog/services/ServiceGps.java

@@ -0,0 +1,60 @@
+package fr.chteufleur.mytrackingdog.services;
+
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.os.Bundle;
+import android.util.Log;
+
+import fr.chteufleur.mytrackingdog.MainActivity;
+
+public class ServiceGps implements IServiceGps, LocationListener {
+
+    private static final String TAG = "ServiceGps";
+    private LocationManager locationManager;
+    private Location currentLocation = null;
+
+    public void setLocationManager(LocationManager locationManager) {
+        this.locationManager = locationManager;
+    }
+
+    public Location getCurrentLocation() {
+        return currentLocation;
+    }
+
+
+    @Override
+    public void start() {
+        try {
+            this.locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, this);
+        } catch (SecurityException ex) {
+            Log.e(TAG, "Location permission is not activated.", ex);
+        }
+    }
+
+    @Override
+    public void stop() {
+        this.locationManager.removeUpdates(this);
+    }
+
+
+    @Override
+    public void onLocationChanged(Location location) {
+        currentLocation = location;
+    }
+
+    @Override
+    public void onStatusChanged(String s, int i, Bundle bundle) {
+        stop();
+    }
+
+    @Override
+    public void onProviderEnabled(String s) {
+        start();
+    }
+
+    @Override
+    public void onProviderDisabled(String s) {
+        stop();
+    }
+}