Android Open Source - maps my 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;
/*w ww  . ja  va  2 s .  c  o m*/
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.util.Log;
import android.widget.Toast;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;

/*
 * overlayItems is used, because I already had the class... likely should have just written a new class to hold the data correctly.
 * It should convert from the strings coordinates to the geopoints in here, instead of the activity, also.
 *   Or maybe the string coor should be converted while processing the xml... yea probably...
 */

public class myOverlay extends Overlay  {

  ArrayList<myOverlayItem> mOverlays;
  Context mContext;
  public myOverlay( ArrayList<myOverlayItem> p, Context c) {
    mOverlays = p;
    mContext = c;
  }
  @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
  public boolean onTap(GeoPoint p, MapView mapView) {
    
    //Toast.makeText(mContext, "Geopoints: "+p.getLatitudeE6()/1E6+" "+p.getLongitudeE6()/1E6, Toast.LENGTH_LONG).show();
    
    AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
    dialog.setTitle("click point");
    dialog.setMessage("Geopoints: "+p.getLongitudeE6()/1E6+" "+p.getLatitudeE6()/1E6);
    dialog.show();
    
    return false; 

    
  }
}

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