Drawing overlays for Android Maps (aka Search for Starbucks)

Without much Ado - Here are the screen shots

001
002
003

Key strokes

  • S - Toggle satellite imagery
  • T - Toggle traffic imagery
  • I - Zoom in
  • O - Zoom out
  • F - Search for addresses or businesses
  • P - Search for pizza :)
  • 1 / 2 / 3 …. 9 - Display information about a specific item and center it

Code sample for Overlays 

package org.apache.maps;

import android.graphics.Canvas;
import android.graphics.Paint;
import com.google.android.maps.Overlay;
import com.google.android.maps.Point;
import com.google.googlenav.Placemark;
import com.google.googlenav.Search;

public class MyOverlay extends Overlay {
    BrowseMap mMap;
    Paint paint1 = new Paint();
    Paint paint2 = new Paint();

    public MyOverlay(BrowseMap map) {
        mMap = map;
        paint2.setARGB(255, 255, 255, 255);
    }

    public void draw(Canvas canvas, PixelCalculator pixelCalculator, boolean b) {
        super.draw(canvas, pixelCalculator, b);

        Search search = mMap.getSearch();
        if (search != null) {
            for (int i = 0; i < search.numPlacemarks(); i++) {
                Placemark placemark = search.getPlacemark(i);
                int[] screenCoords = new int[2];
                Point point = new Point(placemark.getLocation().getLatitude(),
                        placemark.getLocation().getLongitude());
                pixelCalculator.getPointXY(point, screenCoords);
                canvas.drawCircle(screenCoords[0], screenCoords[1], 9, paint1);
                canvas.drawText(Integer.toString(i + 1),
                        screenCoords[0] - 4,
                        screenCoords[1] + 4, paint2);
            }
        }
    }
}

Download the sources and Application - BrowseMap2.0.zip

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You’re currently reading “Drawing overlays for Android Maps (aka Search for Starbucks),” an entry on Show me the code! - By Davanum Srinivas

Published:
11.19.07 / 8pm
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