Question

Possible Duplicate:
Android : Location.distanceTo not working correctly?

I am trying to calculate the distance between the user location(driver or moving location) and a fixed latitude longitude. But however the text does not display the result and just displays TextView.

And whenever the user comes to a certain radius of the fixed latitude longitude the imageview will change to another drawable.I have been trying to do this for over a week now. Any help guys?

---

Main code:

 public  void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.lights);


    //placing location
    LocationManager loc = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
    Location location = loc.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    double clong = location.getLongitude();  
    double clat = location.getLatitude();    //current longitude and latitude

    double latitude=0.305085;
    double longitude=101.70506;     //fixed location

    double dist = Math.sqrt(Math.pow((111.3 * (latitude - clat)),2) + Math.pow((71.5 * (longitude - clong)),2)) * 1000;


if(dist<1000){
    calculate(dist);

    tvDis = (TextView)findViewById(R.id.distance);

    tvDis.setText(dist+"m");

}

 }



 public void calculate(double x){
    ImageView light = (ImageView)findViewById(R.id.imageView1);

    if (x<1000){

        light.setImageResource(R.drawable.icon_yellow);

        if(x<500){
            light.setImageResource(R.drawable.icon_red);
        }
    }
    else{
        light.setImageResource(R.drawable.icon_green);
    }

}

---

I have tried changing 1000 to a larger number but still there is no luck.

Answer 1

From the developers site

public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)

http://developer.android.com/reference/android/location/Location.html