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PODraw a route using current location from device on map using GPS Provider
 

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    <p>I'm working on a project to display a route in a <code>MapView</code> based on current location from <code>GPS</code> Provider. I'm able to draw the path between two points but the problem starts when the location changes to a new point causing the draw path to erase. </p> <p>Basically my Location Listener saves the current <code>GeoPoint</code> and sets the new <code>GeoPoint</code> location and after that it starts the overlay to draw a path based on those two points.I think an option could be saving the coordinates to a database and then pulling the information from there to draw the path. </p> <p>Here is my code so far:</p> <pre><code>private class MyLocationListener implements LocationListener { public void onLocationChanged(Location location) { Toast.makeText(getBaseContext(), "Tracking device..", Toast.LENGTH_SHORT).show(); gp2 = new GeoPoint( gp1.getLatitudeE6(), gp1.getLongitudeE6()); gp1 = new GeoPoint( (int) (location.getLatitude() * 1000000), (int) (location.getLongitude() * 1000000)); myOverlay = new MapOverlay(); mapOverlays_route.add(myOverlay); myMapView.invalidate(); } } class MapOverlay extends com.google.android.maps.Overlay{ public MapOverlay(){ } public void draw(Canvas canvas, MapView mapv, boolean shadow){ super.draw(canvas, mapv, shadow); //Configuring the paint brush Paint mPaint = new Paint(); mPaint.setDither(true); mPaint.setColor(Color.RED); mPaint.setStyle(Paint.Style.FILL_AND_STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(4); Point p1 = new Point(); Point p2 = new Point(); Path path1 = new Path(); Path path2 = new Path(); projection.toPixels(gp1, p1); projection.toPixels(gp2, p2); path1.moveTo(p2.x, p2.y);//current location path1.lineTo(p1.x,p1.y);//new location canvas.drawPath(path1, mPaint);//drawing the path } } </code></pre>
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