#45 Showing Field Papers title and page number that the center of the…

… map is in

MapboxAndroidSDK/src/main/java/org/fieldpapers/model/FPAtlas.java

@@ -9,9 +9,14 @@
 import com.mapbox.mapboxsdk.events.RotateEvent;
 import com.mapbox.mapboxsdk.events.ScrollEvent;
 import com.mapbox.mapboxsdk.events.ZoomEvent;
+import com.mapbox.mapboxsdk.geometry.LatLng;
 import com.mapbox.mapboxsdk.overlay.Marker;
 import com.mapbox.mapboxsdk.views.MapView;
 import com.mapbox.mapboxsdk.views.MapViewListener;
+import com.vividsolutions.jts.geom.Coordinate;
+import com.vividsolutions.jts.geom.Envelope;
+import com.vividsolutions.jts.geom.Geometry;
+import com.vividsolutions.jts.geom.GeometryFactory;
 import com.vividsolutions.jts.index.quadtree.Quadtree;
 
 import org.apache.commons.io.FileUtils;
@@ -23,18 +28,22 @@
 import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 public class FPAtlas implements MapViewListener, MapListener {
 
     private static final String PREVIOUS_FP_FILE_PATH = "org.redcross.openmapkit.PREVIOUS_FP_FILE_PATH";
+    public static final GeometryFactory GEOMETRY_FACTORY = new GeometryFactory();
+
     private static File fpGeoJson;
     private static FPAtlas atlas;
 
     private JSONObject geoJson;
     private String title;
 
     private Activity activity;
+    private MapView mapView;
 
     private Quadtree spatialIndex = new Quadtree();
     private Map<String, FPPage> pages = new HashMap<>();
@@ -65,6 +74,7 @@ public static void addToMap(Activity activity, MapView mapView) throws IOExcepti
         if (atlas == null) return;
 
         atlas.setActivity(activity);
+        atlas.setMapView(mapView);
 
         mapView.setMapViewListener(atlas);
         mapView.addListener(atlas);
@@ -121,11 +131,37 @@ public void setActivity(Activity activity) {
         this.activity = activity;
     }
 
-    private FPPage findMapCenterPage() {
+    public void setMapView(MapView mapView) {
+        this.mapView = mapView;
+    }
 
-        return null;
+    private void findMapCenterPage() {
+        LatLng center = mapView.getCenter();
+        Coordinate centerCoord = new Coordinate(center.getLongitude(), center.getLatitude());
+        Envelope env = new Envelope(centerCoord);
+        List fpPages = spatialIndex.query(env);
+        for (Object p : fpPages) {
+            FPPage page = (FPPage)p;
+            Geometry pageGeom = page.geometry();
+            if (pageGeom.contains(GEOMETRY_FACTORY.createPoint(centerCoord))) {
+                foundMapCenterPage(page);
+            }
+        }
     }
 
+    private void foundMapCenterPage(FPPage page) {
+        if (activity != null && activity instanceof FPListener) {
+            String msg = pageMessage(page);
+            ((FPListener)activity).onMapCenterPageChangeMessage(msg);
+        }
+    }
+
+    private String pageMessage(FPPage page) {
+        return title() + " " + page.pageNumber();
+    }
+
+
+
 
     /**
      * LISTENERS

MapboxAndroidSDK/src/main/java/org/fieldpapers/model/FPPage.java

@@ -18,10 +18,9 @@ public class FPPage {
     private String pageNumber;
     private String url;
 
-    private GeometryFactory geometryFactory = new GeometryFactory();
-
     public FPPage(JSONObject feature) {
         this.feature = feature;
+        parsePageNumber();
         buildGeometry();
         buildEnvelope();
     }
@@ -37,7 +36,15 @@ private void buildGeometry() {
                 double lat = coord.getDouble(1);
                 coordinates[i] = new Coordinate(lng, lat);
             }
-            geom = geometryFactory.createPolygon(coordinates);
+            geom = FPAtlas.GEOMETRY_FACTORY.createPolygon(coordinates);
+        } catch (JSONException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void parsePageNumber() {
+        try {
+            pageNumber = feature.getJSONObject("properties").getString("page_number");
         } catch (JSONException e) {
             e.printStackTrace();
         }
@@ -48,8 +55,7 @@ private void buildEnvelope() {
     }
 
     public String pageNumber() {
-
-        return null;
+        return pageNumber;
     }
 
     public Geometry geometry() {

app/src/main/java/org/redcross/openmapkit/MapActivity.java

@@ -67,6 +67,7 @@ public class MapActivity extends AppCompatActivity implements OSMSelectionListen
 
     protected MapView mapView;
     protected OSMMap osmMap;
+    protected TextView fieldPapersMsg;
     protected ListView mTagListView;
     protected ImageButton mCloseListViewButton;
     protected ImageButton tagButton;
@@ -141,6 +142,9 @@ protected void onCreate(Bundle savedInstanceState) {
 
         //get map from layout
         mapView = (MapView)findViewById(R.id.mapView);
+
+        // get Field Papers Message
+        fieldPapersMsg = (TextView)findViewById(R.id.fieldPapersMsg);
 
         // initialize basemap object
         basemap = new Basemap(this);
@@ -809,7 +813,7 @@ private boolean isAppInstalled(String uri) {
 
     @Override
     public void onMapCenterPageChangeMessage(String msg) {
-
+        fieldPapersMsg.setText(msg);
     }
 
 }

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

@@ -28,7 +28,17 @@
                 android:id="@+id/mapView"
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent" />
-
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:textAppearance="?android:attr/textAppearanceMedium"
+                android:text=""
+                android:id="@+id/fieldPapersMsg"
+                android:layout_alignParentTop="true"
+                android:layout_alignParentLeft="true"
+                android:layout_alignParentStart="true" />
+
             <ImageButton
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"