Android Open Source - egotrip Placemark Overlay

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License

The source code is released under:
Apache License
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Java Source Code

package net.myegotrip.egotrip.map;
//w  w w . j a va2s .  c o  m
import net.myegotrip.egotrip.MapViewActivity;
import net.myegotrip.egotrip.R;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.util.Log;
import android.view.GestureDetector;

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

public class PlacemarkOverlay extends Overlay {

  public static final String TAG = "EGOTRIP-PlacemarkOverlay";

  private MapViewActivity act;
  GestureDetector mGestureDetector;
  Placemark mark;
  int width;
  int height;

  public PlacemarkOverlay(Placemark mark, MapViewActivity act) {
    this.mark = mark;
    this.act = act;
  }

  @Override
  public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) {
    super.draw(canvas, mapView, shadow);

    // Convert geo coordinates to screen pixels
    Point screenPoint = new Point();
    mapView.getProjection().toPixels(mark.getGeoPoint(), screenPoint);

    double acc = mark.getLocation().getAccuracy();
    if (acc > 10) {
      // more than 10m, draw a circle
      float radius=mapView.getProjection().metersToEquatorPixels((float)acc);
      Paint paint = new Paint();
      paint.setAntiAlias(true);
      paint.setColor(Color.GRAY);
      paint.setAlpha(60);
      
      canvas.drawCircle((float)screenPoint.x, (float)screenPoint.y, radius, paint);
    }
    // Read the image

    Bitmap markerImage = null;
    int d = 0;
    if (mark.hasCustomDrawable()) d = mark.getCustomDrawable();
    else d = mark.getDrawable();
    markerImage = BitmapFactory.decodeResource(act.getResources(), d);
    
    width = markerImage.getWidth();
    height = markerImage.getHeight();
    int dx = width;
    canvas.drawBitmap(markerImage, screenPoint.x - dx / 2, screenPoint.y - height/ 2, null);
    
    // if note, draw note icon
    if (mark.getDescription()!= null) {      
      markerImage = BitmapFactory.decodeResource(act.getResources(), R.drawable.message);
      canvas.drawBitmap(markerImage, screenPoint.x +dx, screenPoint.y - markerImage.getHeight() / 2, null);
      dx += markerImage.getWidth();
    }
    // if picture, draw camera icon
    if (mark.hasBitmap()) {      
      markerImage = BitmapFactory.decodeResource(act.getResources(), R.drawable.camera);
      canvas.drawBitmap(markerImage, screenPoint.x +dx, screenPoint.y - markerImage.getHeight() / 2, null);
    }
    // highlight current location
    
    return true;
  }

  @Override
  public boolean onTap(GeoPoint p, MapView mapview) {
    // Handle tapping on the overlay here
    p("got onTap");
    final Projection pr = mapview.getProjection();
    
    Point markerLoc = new Point();
    mapview.getProjection().toPixels(mark.getGeoPoint(), markerLoc);
    
    int delta = 20;
    int minX = markerLoc.x-delta;
    int minY =  markerLoc.y-delta;
    int maxX = minX + width+2*delta;
    int maxY = minY + height+2*delta;

    Point pt = pr.toPixels(p, null);

    if(pt.x >= minX && pt.y >= minY && pt.x <= maxX && pt.y <= maxY){
      p("Got on tap on placemark " + mark);  
      act.openMyContextMenu(mark);
      return true;
    }    
    else {
      //act.openMyContextMenu();
      //p("Not quite tap on placemark " + mark);  
    }
    return false;
  }

  private void p(String msg) {
    act.addDebug(msg);
    Log.d(TAG, msg);
  }

}
Java Source Code List
