I have a problem in my Android application

I have a path direction on my application and I want to add an onTap method for the path, so if I touch that path my application will display information with alert dialog.

This my activity code:

hasilrute hr = new hasilrute();
for (int k = 0;k < hr.r2.size(); k++){
String angkot = hr.r2.get(i).angkot;

                                Cursor c = db.getLatLong(hasilrute.a);
                                Cursor cc = db.getLatLong(hasilrute.b);
                                String x = (c.getString(3)+","+c.getString(2));
                                String xx = (cc.getString(3)+","+cc.getString(2));

                                String pairs[] = getDirectionData(x, xx);
                                String[] lnglat = pairs[0].split(",");

                                GeoPoint point = new GeoPoint((int) (Double.parseDouble(lnglat[1]) *1E6),(int)(Double.parseDouble(lnglat[0]) * 1E6));

                                GeoPoint gp1;
                                GeoPoint gp2 = point;

                                for (int j = 1;j < pairs.length; j++){
                                    lnglat = pairs[j].split(",");
                                    gp1 = gp2;
                                    gp2 = new GeoPoint((int) (Double.parseDouble(lnglat[1]) *1E6),(int) (Double.parseDouble(lnglat[0]) * 1E6));
                                    mapView.getOverlays().add(new jalur(gp1, gp2,angkot));

                                }
                            }

and it's my jalur.java code

public class jalur extends Overlay {

private GeoPoint gp1;
private GeoPoint gp2;
private String angkot;
private Context mContext;

public jalur(GeoPoint gp1, GeoPoint gp2, String angkot){
    this.gp1 = gp1;
    this.gp2 = gp2;
    this.angkot = angkot;
}

@Override
public boolean draw(Canvas canvas, MapView mapView,
        boolean shadow, long when){
        Projection projection = mapView.getProjection();

            if (shadow == false){
                if (angkot.equals("Cimahi-Leuwipanjang")){
                Paint paint = new Paint();
                paint.setAntiAlias(true);
                Point point = new Point();
                projection.toPixels(gp1,point);
                Point point2 = new Point();
                projection.toPixels(gp2, point2);
                paint.setColor(Color.rgb(118,171,127));
                paint.setStrokeWidth(2);
                canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                (float) point2.y, paint);

                }if (angkot.equals("Cimahi-Cangkorah")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(67,204,255));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);

                }if (angkot.equals("Cimindi-Cipatik")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(42,82,0));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Jalan Kaki")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(0,0,0));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Cimahi-Padalarang")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(229,66,66));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }
                if (angkot.equals("Pasantren-Sarijadi")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(4,39,255));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Cimahi-Parongpong")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(141,0,200));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Cimahi-Cibeber")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(255,246,0));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Cimahi-Cimindi")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(220,145,251));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Cimahi-Contong")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(242,138,138));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Cimahi-Soreang")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(0,255,78));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }if (angkot.equals("Cimahi-Batujajar")){
                    Paint paint = new Paint();
                    paint.setAntiAlias(true);
                    Point point = new Point();
                    projection.toPixels(gp1,point);
                    Point point2 = new Point();
                    projection.toPixels(gp2, point2);
                    paint.setColor(Color.rgb(137,217,51));
                    paint.setStrokeWidth(2);
                    canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
                }
            }
            return super.draw(canvas, mapView, shadow, when);
}
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow){
    super.draw(canvas, mapView, shadow);
}




}

thanks for your attention :)