Android Open Source - maps my Itemized Overlay

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License

The source code is released under:
GNU General Public License
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Java Source Code

package edu.cs4730.MapDemo;
import java.util.ArrayList;
import android.app.AlertDialog;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.util.Log;
//from  w w w  .  jav a2s  .c  o m
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
import com.google.android.maps.Projection;

/*
 * Part of this code comes from http://stackoverflow.com/questions/3036139/android-drawing-path-as-overlay-on-mapview
 *  mostly the draw method, with a number of fixes.
 */

public class myItemizedOverlay extends ItemizedOverlay<myOverlayItem> {

  private ArrayList<myOverlayItem> mOverlays = new ArrayList<myOverlayItem>();
  private Context mContext;

  public myItemizedOverlay(Drawable defaultMarker, Context context)
  {
    super(boundCenterBottom(defaultMarker));
    mContext = context;
  }

  public void addOverlay(myOverlayItem overlay)
  {
    mOverlays.add(overlay);
    populate();
  }

  @Override
  protected myOverlayItem createItem(int i)
  {
    return mOverlays.get(i);
  }

  @Override
  public int size()
  {
    return mOverlays.size();
  }

  /*
   * (non-Javadoc)
   * @see com.google.android.maps.ItemizedOverlay#hitTest(com.google.android.maps.OverlayItem, android.graphics.drawable.Drawable, int, int)
   * 
   * Need to figure out if the user managed to tap inside the space of the area, except I don't have time right now.
   * 
   */
  /*
  @Override
  protected boolean hitTest(myOverlayItem item, android.graphics.drawable.Drawable marker, int hitX, int hitY) {
    return false;
    
  }
  */
  @Override
  public void draw(Canvas c, MapView mapView, boolean shadow) {
    int i;
    myOverlayItem tmp;
    Paint myColor = new Paint();
    
    myColor.setStyle(Paint.Style.FILL);
    myColor.setColor(Color.RED);
    myColor.setAlpha(50);  //not opaque 
    
    Log.d("myItemizedOverlay","Drawing?");
    //get the projection, so I'm drawing correctly.
    Projection projection = mapView.getProjection();


    if (shadow == false) {  //draw called twice, once with shadow true and again with shadow false!
      //draw the paths here.  
      for(i=0; i<mOverlays.size(); i++) {
        Log.d("myItemizedOverlay","Drawing overlay number "+i);
        tmp = mOverlays.get(i);
        //now draw it
        ArrayList<GeoPoint> gp = tmp.getPath();
        Path p = new Path();

        Point mp = new Point();
        projection.toPixels(gp.get(0), mp);
        p.moveTo(mp.x, mp.y);
        //p.moveTo(gp.get(0).getLatitudeE6(), gp.get(0).getLongitudeE6());
        Log.d("myItemizedOverlay","Overlay "+mp.x+" "+mp.y);
        for(int j=1; j<gp.size(); j++) {
          mp = new Point();
          projection.toPixels(gp.get(j), mp);
          p.lineTo(mp.x, mp.y);
        }
        //set the brush correctly.
        myColor.setStyle(Paint.Style.FILL);
        myColor.setColor(Color.RED);
        myColor.setAlpha(50);
        c.drawPath(p, myColor );
        //draw the outline
        myColor.setStyle(Paint.Style.STROKE);
        myColor.setStrokeWidth(3);
        myColor.setColor(Color.GRAY);
        myColor.setAlpha(50);
        c.drawPath(p, myColor );
        //reset

      }
    }
    super.draw(c, mapView, shadow);
  }
  
  @Override
  protected boolean onTap(int index)
  {
    OverlayItem item = mOverlays.get(index);
    AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
    dialog.setTitle(item.getTitle());
    dialog.setMessage(item.getSnippet());
    dialog.show();
    return true;
  }
}
Java Source Code List
