Button destination_next_button;
static final String baseURL = "http://maps.googleapis.com/maps/api/distancematrix/json?origins=";
double distance = 0;
double time = 0;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    destination_next_button = (Button) findViewById(R.id.destination_next_button);
    destination_next_button.setOnClickListener(this);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

private void destination_next_buttonClick() {
    TextView tv = (TextView) findViewById(R.id.time_distance);
    tv.setText(data());
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.destination_next_button:
        destination_next_buttonClick();
        break;
    }
}

    public String data(){
        TextView start = (TextView) findViewById(R.id.startinglocation);
        TextView end = (TextView) findViewById(R.id.endinglocation);

        String start1 = start.getText().toString();
        String end1 = end.getText().toString();

        StringBuilder URL = new StringBuilder(baseURL);
        URL.append(start1 + "&destinations=" + end1 + "&sensor=false");
        String fullUrl = URL.toString();

        JSONObject json = getJson(fullUrl);

        double distance = extractDistance(json);
        double duration = extractDuration(json);

        setDistance(distance);
        setTime(duration);

        return dataToString();
    }

       private double extractDistance(JSONObject json) {
            JSONArray rowsArray;
            double distanceInMiles = -1;
            try {
                // Getting Array of Distance Matrix Results
                rowsArray = json.getJSONArray("rows");
                JSONObject rowsObject = rowsArray.getJSONObject(0);//only one element in this array
                JSONArray elementsArray = rowsObject.getJSONArray("elements");
                JSONObject elementsObject = elementsArray.getJSONObject(0);//only one element in this array
                JSONObject distanceObject = elementsObject.getJSONObject("distance");
                distanceInMiles = (distanceObject.getDouble("value"))/1609.344; //distance in meters converted to miles
            }
            catch (JSONException e) {
                e.printStackTrace();
            }
            return distanceInMiles;
        }

       private double extractDuration(JSONObject json) {
            JSONArray rowsArray = null;
            double distanceInMiles = -1;
            try {
                // Getting Array of Distance Matrix Results
                rowsArray = json.getJSONArray("rows");
                JSONObject rowsObject = rowsArray.getJSONObject(0);//only one element in this array
                JSONArray elementsArray = rowsObject.getJSONArray("elements");
                JSONObject elementsObject = elementsArray.getJSONObject(0);//only one element in this array
                JSONObject distanceObject = elementsObject.getJSONObject("duration");
                distanceInMiles = (distanceObject.getDouble("value"))/1609.344; //distance in meters converted to miles
            }
            catch (JSONException e) {
                e.printStackTrace();
            }
            return distanceInMiles;
        }

    public static JSONObject getJson(String url){

        InputStream is = null;
        String result = "";
        JSONObject jsonObject = null;

        // HTTP
        try {
            HttpClient httpclient = new DefaultHttpClient(); // for port 80 requests!
            HttpPost httppost = new HttpPost(url);
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            is = entity.getContent();
        } catch(Exception e) {
            return null;
        }

        // Read response to string
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"),8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "n");
            }
            is.close();
            result = sb.toString();
        } catch(Exception e) {
            return null;
        }

        // Convert string to object
        try {
            jsonObject = new JSONObject(result);
        } catch(JSONException e) {
            return null;
        }

        return jsonObject;

    }

    public void setTime(double t){
        time = t;
    }

    public void setDistance(double d){
        distance = d;
    }

    public String dataToString(){

        return "Total Distance: " + distance + ", Total Duration: " + time;
    }

"rows" : [

     {

     "elements" : [

        {

           "distance" : {

              "text" : "1,743 km",

              "value" : 1742628

           },

           "duration" : {

              "text" : "15 hours 28 mins",

              "value" : 55705

           },

           "status" : "OK"

        }

     ]

  }