How to calculate distance between two location by road?

Question

I want to calculate distance between two locations by road/like driving mode. Here is my code but error is coming at "response = client.execute(httppost);" this line.Please help me.

private double getDistance(double latFrom, double lngFrom,double latTo,double lngTo) {
    StringBuilder stringBuilder = new StringBuilder();
    String apikey="API KEY";
    Double dist = 0.0;
    try {


        String url = "http://maps.googleapis.com/maps/api/directions/json?origin=" + latFrom + "," + lngFrom + "&destination=" + latTo + "," + lngTo + "&mode=driving&sensor=false"+"&key="+apikey;

        HttpPost httppost = new HttpPost(url);

        HttpClient client = new DefaultHttpClient();
        HttpResponse response;
        stringBuilder = new StringBuilder();


        response = client.execute(httppost);
        HttpEntity entity = response.getEntity();
        InputStream stream = entity.getContent();
        int b;
        while ((b = stream.read()) != -1) {
            stringBuilder.append((char) b);
        }
    } catch (ClientProtocolException e) {
    } catch (IOException e) {
    }

    JSONObject jsonObject = new JSONObject();
    try {

        jsonObject = new JSONObject(stringBuilder.toString());
        JSONArray array = jsonObject.getJSONArray("routes");
        JSONObject routes = array.getJSONObject(0);
        JSONArray legs = routes.getJSONArray("legs");
        JSONObject steps = legs.getJSONObject(0);
        JSONObject distance = steps.getJSONObject("distance");
        Log.i("Distance", distance.toString());
        dist = Double.parseDouble(distance.getString("text").replaceAll("[^\\.0123456789]","") );

    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return dist;
}

Do we have to guess, what the error is? Please provide the error you get — Dominik Wuttke, Oct 29 '19 at 17:52
its giving error as android.os.NetworkOnMainThreadException at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:142) — jyotsna, Oct 29 '19 at 18:07
Call your request from a background thread like an AsyncTask or Runnable. — Jarvis, Oct 29 '19 at 18:16

score 1 · Accepted Answer · answered Oct 29 '19 at 18:17

The solution to your error would be to perform all network operations on a background thread. For example, using AsyncTask or Runnable on a separate thread from the main.

To elaborate more on my answer, your network call would be performed in the doInBackground() method of your AsyncTask.

NEVER perform network operations on the main thread because network calls are blocking operations and would severely hinder your UI responsiveness.

How to calculate distance between two location by road?

1 Answers1