track distance and time based on my track details

Question

I am working on gps tracking in android to track the user location and provide the feature to record the track.I am able to draw path now i want to calculate the track dista

Answer 1

I have implement by my way, I have create inner class which extends the Overlay class to draw the path/route on map

private class TrackOverlay extends Overlay {
    private List polyline;

    private Paint mPaint;
    private Point p1;
    public TrackOverlay() {
        polyline = new ArrayList();

        mPaint = new Paint();
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(5);
        mPaint.setARGB(150, 62, 184, 240);

        p1 = new Point();
    }

    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {
        super.draw(canvas, mapView, shadow);
        if (drawTrack && polyline.size() > 0) {
            mPaint.setARGB(120, 212, 51, 51);
            drawTrackPath(canvas);
        }
        if (showTrack && polyline.size() > 0) {
            mPaint.setARGB(150, 62, 184, 240);
            drawTrackPath(canvas);
        }
    }

    private void drawTrackPath(Canvas canvas) {
        int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
        for (GeoPoint gp : polyline) {
            mapView.getProjection().toPixels(gp, p1);
            x2 = p1.x;
            y2 = p1.y;

            if (x1 != 0 && y1 != 0) {
                canvas.drawLine(x1, y1, x2, y2, mPaint);
            }
            x1 = x2;
            y1 = y2;
        }
    }

    void addTrackPoint(GeoPoint geoPoint) {
        polyline.add(geoPoint);
    }

    List getPolylineTrack() {
        return polyline;
    }
}

create new object of this class and add into the map overlay like this way

trackOverlay = new TrackOverlay();
mapView.getOverlays().add(trackOverlay);

now I have draw the path when the user click on button to record the track and find the total distance and time for that I have create update method which will call from the locationChange() method when gps get new location that location will be pass to the map activity and store into the polyline object of the TrackOverlay class.

public static void updateMap() {
    if (ServiceLocation.curLocation != null) {
        curTime = ServiceLocation.curLocation.getTime();
        curLat = ServiceLocation.curLocation.getLatitude();
        curLng = ServiceLocation.curLocation.getLongitude();

        if (mapView != null) {
            point = new GeoPoint((int) (curLat * 1e6), (int) (curLng * 1e6));

            mc.animateTo(point);
            if (drawTrack && trackOverlay != null) {
                trackOverlay.addTrackPoint(point);
                if(prevTime>0)
                    totalSec += (curTime-prevTime);

                double x1 = 0, x2 = 0, y1 = 0, y2 = 0, temp_dist=0,temp_speed=0;
                if(trackOverlay.polyline.size()>1){
                    x1 = trackOverlay.polyline.get(trackOverlay.polyline.size()-2).getLatitudeE6()/1e6;
                    y1 = trackOverlay.polyline.get(trackOverlay.polyline.size()-2).getLongitudeE6()/1e6;

                    x2 = trackOverlay.polyline.get(trackOverlay.polyline.size()-1).getLatitudeE6()/1e6;
                    y2 = trackOverlay.polyline.get(trackOverlay.polyline.size()-1).getLongitudeE6()/1e6;

                    dist += (Geo_Class.distFrom(x1, y1, x2, y2) / METER_KILOMETER);

                    double totalMeter = dist * METER_KILOMETER;
                    double total_sec = (totalSec/1000) * KILOMETER_HOUR;

                    speed = totalMeter/total_sec;

                    txt_msg.setText("Distance " + round(dist,5,BigDecimal.ROUND_HALF_UP) + " km");
                    speed_msg.setText("Speed " + round(speed,3,BigDecimal.ROUND_HALF_UP) + " kmph \n time " +(totalSec/1000) + " sec");
                }

            }else{
                totalSec = 0;
            }
            mapView.invalidate();
            prevTime = curTime;
        }
    }
}

ok every time this method was call and update the map with new point and in this I have use the Geo_Class.distFrom(x1, y1, x2, y2) my create method which was calculate the distance between two point and when getting new point set to the curr point and curr point will assign to the prev point. same way for time to calculate the total time. and also find the speed for that using this

speed = total distance/total time