extends ItemizedOverlay : Map « Core Class « Android

1. Android
2. Core Class
3. Map

extends ItemizedOverlay

   



package app.test;

import java.util.ArrayList;
import java.util.Iterator;

import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;

public class MappingOverlayActivity extends MapActivity {
    private MapView mapView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.mapview);

        mapView = (MapView) findViewById(R.id.mapview);
        mapView.setBuiltInZoomControls(true);

        Drawable marker=getResources().getDrawable(R.drawable.mapmarker); 
        marker.setBounds((int)(-marker.getIntrinsicWidth()/2),
            -marker.getIntrinsicHeight(),
            (int) (marker.getIntrinsicWidth()/2), 
            0);
        
        InterestingLocations funPlaces = new InterestingLocations(marker);
        mapView.getOverlays().add(funPlaces);
        
        GeoPoint pt = funPlaces.getCenterPt();
        int latSpan = funPlaces.getLatSpanE6();
        int lonSpan = funPlaces.getLonSpanE6();
        Log.v("Overlays", "Lat span is " + latSpan);
        Log.v("Overlays", "Lon span is " + lonSpan);

        MapController mc = mapView.getController();
        mc.setCenter(pt);
        mc.zoomToSpan((int)(latSpan*1.5), (int)(lonSpan*1.5));
    }

    @Override
    protected boolean isLocationDisplayed() {
        return false;
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }

    class InterestingLocations extends ItemizedOverlay {
        private ArrayList<OverlayItem> locations = new ArrayList<OverlayItem>();
        private GeoPoint center = null;

        public InterestingLocations(Drawable marker)
        {
            super(marker);
            GeoPoint a = new GeoPoint((int)(38.418971*1000000),(int)(-11.581436*1000000));
            GeoPoint b = new GeoPoint((int)(38.410067*1000000),(int)(-11.583699*1000000));

            locations.add(new OverlayItem(a,"A", "A"));
            locations.add(new OverlayItem(b,"B", "B"));

            populate();
        }
        public GeoPoint getCenterPt() {
            if(center == null) {
                int northEdge = -90000000;   // i.e., -90E6 microdegrees
                int southEdge = 90000000;
                int eastEdge = -180000000;
                int westEdge = 180000000;
                Iterator<OverlayItem> iter = locations.iterator();
                while(iter.hasNext()) {
                    GeoPoint pt = iter.next().getPoint();
                    if(pt.getLatitudeE6() > northEdge) northEdge = pt.getLatitudeE6();
                    if(pt.getLatitudeE6() < southEdge) southEdge = pt.getLatitudeE6();
                    if(pt.getLongitudeE6() > eastEdge) eastEdge = pt.getLongitudeE6();
                    if(pt.getLongitudeE6() < westEdge) westEdge = pt.getLongitudeE6();
                }
                center = new GeoPoint((int)((northEdge + southEdge)/2),
                        (int)((westEdge + eastEdge)/2));
            }
            return center;
        }

        @Override
        public void draw(Canvas canvas, MapView mapview, boolean shadow) {
          // Here is where we can eliminate shadows by setting to false
          super.draw(canvas, mapview, shadow);
        }

        @Override
        protected OverlayItem createItem(int i) {
            return locations.get(i);
        }

        @Override
        public int size() {
            return locations.size();
        }
    }
}
<?xml version="1.0" encoding="utf-8"?>
<!-- This file is /res/layout/mapview.xml -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:layout_width="fill_parent"
        android:layout_height="fill_parent">

     <com.google.android.maps.MapView android:id="@+id/mapview"
             android:layout_width="fill_parent"
             android:layout_height="fill_parent"
             android:clickable="true"
             android:apiKey="yourMapKey"
             />
</RelativeLayout>

   
    
    
  

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