Add follow me button.

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

@@ -15,7 +15,9 @@ import android.support.v7.app.AppCompatActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.Surface;
+import android.view.View;
 import android.view.WindowManager;
+import android.widget.ImageButton;
 import android.widget.Toast;
 
 import org.osmdroid.api.IMapController;
@@ -23,6 +25,7 @@ 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.compass.CompassOverlay;
 import org.osmdroid.views.overlay.compass.IOrientationConsumer;
 import org.osmdroid.views.overlay.compass.IOrientationProvider;
 import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider;
@@ -40,11 +43,13 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
     public static final String TAG = "MainActivity";
 
     private MyLocationNewOverlay mLocationOverlay;
+    private CompassOverlay mCompassOverlay;
     private IOrientationProvider compass = null;
     private IServiceGps serviceGps = null;
 
     private Context ctx = null;
     private MapView map = null;
+    private ImageButton btFollowMe;
 
     private Float trueNorth = 0f;
     private int deviceOrientation = 0;
@@ -104,6 +109,11 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
         GeoPoint startPoint = new GeoPoint(45.0000, 5.0000);
         mapController.setCenter(startPoint);
 
+        // Compass
+        this.mCompassOverlay = new CompassOverlay(ctx, new InternalCompassOrientationProvider(ctx), map);
+        map.getOverlays().add(this.mCompassOverlay);
+        this.mCompassOverlay.enableCompass();
+
         // Current position on the map
         this.mLocationOverlay = new MyLocationNewOverlay(new GpsMyLocationProvider(ctx), map);
         map.getOverlays().add(this.mLocationOverlay);
@@ -111,6 +121,21 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
         mLocationOverlay.enableFollowLocation();
         mLocationOverlay.setOptionsMenuEnabled(true);
 
+        // Follow me
+        btFollowMe = (ImageButton) findViewById(R.id.ic_follow_me);
+        btFollowMe.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if (!mLocationOverlay.isFollowLocationEnabled()) {
+                    mLocationOverlay.enableFollowLocation();
+                    btFollowMe.setImageResource(R.drawable.osm_ic_follow_me_on);
+                } else {
+                    mLocationOverlay.disableFollowLocation();
+                    btFollowMe.setImageResource(R.drawable.osm_ic_follow_me);
+                }
+            }
+        });
+
         if (serviceGps == null) {
             serviceGps = new ServiceGps();
             ((Observable) serviceGps).addObserver(this);
@@ -172,6 +197,9 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
     }
 
     private void pause() {
+        if (mCompassOverlay != null) {
+            mCompassOverlay.disableCompass();
+        }
         if (compass != null) {
             compass.stopOrientationProvider();
             compass.destroy();

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

@@ -1,9 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-        android:orientation="vertical" 
-        android:layout_width="fill_parent"
-        android:layout_height="fill_parent">
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/parent_container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" >
+
         <org.osmdroid.views.MapView android:id="@+id/map"
                 android:layout_width="fill_parent" 
                 android:layout_height="fill_parent" />
-</LinearLayout>
+
+    <ImageButton
+        android:id="@+id/ic_follow_me"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentTop="true"
+        android:layout_marginTop="11dp"
+        android:background="#00ffffff"
+        android:contentDescription="@string/bt_follow_me_description"
+        android:cropToPadding="true"
+        android:src="@drawable/osm_ic_follow_me_on" />
+</RelativeLayout>

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

@@ -1,4 +1,5 @@
 <resources>
     <string name="app_name">MyTrackingDog</string>
     <string name="action_settings">Settings</string>
+    <string name="bt_follow_me_description">Follow me</string>
 </resources>