MapView display route between a lot of GeoPoints

Issue

I have an app where an user is given a lot of points (100 or even more) and he has to physically go to those points and "check in". They have to go to those points in a certain order, so I need to display a route in the MapView which passes through all those points.

I've read a lot about getting the route between two points, but I can't find anything about drawing a complex route with a lot of points. Is this behavior possible?

Solution

public class RouteOverlay extends Overlay {
    private GeoPoint gp1;
    private GeoPoint gp2;
    private int color;

public RouteOverlay(GeoPoint gp1, GeoPoint gp2, int color) {
        this.gp1 = gp1;
        this.gp2 = gp2;
        this.color = color;
    }
Now all that's left now for our Overlay is to override the draw() method and draw the line as we need it:

@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
    Projection projection = mapView.getProjection();
    Paint paint = new Paint();
    Point point = new Point();
    projection.toPixels(gp1, point);
    paint.setColor(color);
    Point point2 = new Point();
    projection.toPixels(gp2, point2);
    paint.setStrokeWidth(5);
    paint.setAlpha(120);
    canvas.drawLine(point.x, point.y, point2.x, point2.y, paint);
    super.draw(canvas, mapView, shadow);
}
Back in the Activity, just iterate over the GeoPoints that you got from google maps and add each of them to the MapView:

private void drawPath(List geoPoints, int color) {
   List overlays = mapView.getOverlays();

   for (int i = 1; i < geoPoints.size(); i++) {
    overlays.add(new RouteOverlay(geoPoints.get(i - 1), geoPoints.get(i), color));
   }
}

Answered By - Nipun Gogia