Android计算行驶距离

Question

我目前正在开发一个专注于健身的应用程序。我的基本想法是允许人们跟踪他们的速度、距离和时间。到目前为止，我已经通过使用位置管理器getSpeed（）设法获得了速度。我想知道如何获得旅行的距离？我寻找了一些示例，但对我来说有点困惑，因为我刚刚开始使用android。我将感谢任何帮助或建议，谢谢

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_track);

    start = (Button) findViewById(R.id.btnStart);
    speed = (TextView)findViewById(R.id.txtSpeed);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);



    //initialize location listener
    locationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            getSpeed(location);
        }

        @Override
        public void onStatusChanged(String s, int i, Bundle bundle) {

        }

        @Override
        public void onProviderEnabled(String s) {

        }

        @Override
        public void onProviderDisabled(String s) {

        }

        //get the speed from the given location updates
        public void getSpeed(Location location) {
            currentSpeed = (location.getSpeed()*3600/1000);
            String convertedSpeed = String.format("%.2f",currentSpeed);
            speed.setText(convertedSpeed + "Km/h");
        }

        public void getDistance(Location location){

        }

    };

Answer 1

 //*****this is for log in and gcm reg id passsing in back end
private class communicate_server_for_get_2_position_duration extends AsyncTask<String, Void, String> {

    static final String TAG = "rvms";

    Context getcontext;
    String lat1 = null, lng1 = null, lat2 = null, lng2 = null;

    String getcontent_for_validate, content;

    public communicate_server_for_get_2_position_duration(Context context, double lat, double lng, double lat2, double lng2) {
        getcontext = context;
        lat1 = String.valueOf(lat);
        lng1 = String.valueOf(lng);
        this.lat2 = String.valueOf(lat2);
        this.lng2 = String.valueOf(lng2);
    }


    @Override
    protected void onPreExecute() {

        // TODO Auto-generated method stub
        super.onPreExecute();

        try {

        } catch (Exception e) {
            finish();
        }

    }

    @Override
    protected String doInBackground(String... params) {
        // TODO Auto-generated method stub

        BufferedReader reader;
        String url_data = null;
        try {
            url_data = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=" + lat1 + "," + lng1 + "&destinations=" + lat2 + "," + lng2 + "&mode=driving&language=en-EN";
            url_data = url_data.replace("\n", "%20");
            url_data = url_data.replace(" ", "%20");
            url_data = url_data.replace("'", "%20");
        } catch (Exception e) {

        }
        Log.i("pavan", "url" + url_data);
        try {
            URL url = new URL(url_data);
            URLConnection conection = url.openConnection();
            conection.setConnectTimeout(5000);
            conection.setDoOutput(true);


            reader = new BufferedReader(new InputStreamReader(conection.getInputStream()));
            StringBuilder result = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                result.append(line + "");

            }
            content = result.toString();
            System.out.print(result);
            System.out.println(content);
            getcontent_for_validate = content;


        } catch (Exception e) {
            e.printStackTrace();
        }
        return content;


    }

    @Override
    protected void onPostExecute(String result) {
        JSONObject jsonobj;
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        //Toast.makeText(context,"response "+result,Toast.LENGTH_LONG).show();
        String distance = null, duration = null;
        if (result != null) {
            if (content.equals("failure")) {


            } else {//ths is getting data for vehicl_list_unread_count code, client id,restapi_key
                JSONObject location1, location2;
                String location_string1 = null;
                try {
                    JSONObject ret = new JSONObject(getcontent_for_validate);
                    // Toast.makeText(getApplicationContext(),"this is get content"+jsonobj.toString(),Toast.LENGTH_SHORT).show();
                    //  System.out.println("this is get content"+jsonobj.toString());


                    try {
                        location1 = ret.getJSONArray("rows").getJSONObject(0);
                        location2 = location1.getJSONArray("elements").getJSONObject(0);


                        JSONObject get_distance = location2.getJSONObject("distance");
                        distance = get_distance.getString("text");

                        JSONObject get_duration = location2.getJSONObject("duration");
                        duration = get_duration.getString("text");

                        Log.d("test", "formattted address:" + location_string1);
                    } catch (JSONException e1) {
                        e1.printStackTrace();

                    }
                } catch (JSONException e1) {
                    e1.printStackTrace();

                }
                try {
                    if (key_for_intent_data_from.equals("from current location")) {

//FabBtn.show (); //String formattedDate=new SimpleDateFormat（"yyyy-MM-dd hh： mm aa"）. form（Calendar.getInstance（）. getTime（））； /Calendarc=Calendar.getInstance（）； SimpleDateFormat sdf=new SimpleDateFormat（"yyyy-MM-dd hh： mm： ss aa"）； String formattedDate=sdf.format（c.getTime());/ /*TimeZone utc=TimeZone.getTimeZone（"etc/UTC"）； DateFormat inputFormat=new SimpleDateFormat（"dd MMM， yyyy HH： mm"， Locale. US）； inputFormat.setTimeZone（utc）； DateFormat outputFormat=new SimpleDateFormat（"dd MMM， yyyy hh： mm aa"， Locale. US）； outputFormat.setTimeZone（utc）；

                        Date date = inputFormat.parse(input);
                        String output = outputFormat.format(date);*/

                        // fabBtn.setVisibility(View.VISIBLE);


                        //currentDateTimeString = java.text.DateFormat.getDateTimeInstance().format(new java.util.Date());

                        duration_text_view.setText("\nPresent DATE/TIME: " + currentDateTimeString + "\nDevice DATE/TIME: " + deviceTime + "\nLOCATION: " + distance + " from your location point.");
                    } else {
                        String snackbar_data = null;


                        snackbar_data = "Date/Time:" + deviceTime + "\nLocation:" + distance + " from your location point.";

                        View parentLayout = findViewById(R.id.map);
                        Snackbar snackbar = Snackbar
                                .make(parentLayout, snackbar_data, Snackbar.LENGTH_INDEFINITE)
                                .setAction("CLOSE", new View.OnClickListener() {
                                    @Override
                                    public void onClick(View view) {

                                    }
                                });

//更改消息文本颜色snackbar。setActionTextColor（颜色：红色）；

//更改操作按钮文本颜色View sbView=snackbar.getView（）； TextView text View=（TextView）sbView.findViewById（android.support.design.R.id.snackbar_text）； text View.setTextColor（Color. WHITE）； text View.set行（5）；snackbar.show（）；

                    }
                } catch (Exception e) {

                }

            }


        } else {

            Toast.makeText(getcontext, "Check net connection", Toast.LENGTH_LONG).show();
        }

    }

}

Answer 2

试试用这个：http://googlemaps.github.io/android-maps-utils/javadoc/com/google/maps/android/SphericalUtil.html

对于您获得的每个位置，您都创建一个LatLng并将其添加到ArrayList中。然后使用此函数，它会为您提供正确的长度：

SphericalUtil.computeLength(latLngs);

Gradle：

 dependencies {
compile 'com.google.maps.android:android-maps-utils:0.4+'
}

编辑：您有一个全局Arraylist locations=new Arraylist。在“onLocationChanged”中，您将添加到位置：

  @Override
    public void onLocationChanged(Location location) {
        locations.add(location);
    }

然后在需要的时候你做：

 for (Location loc :  locations){
     latLngs.add(new LatLng(loc.getLocation().getLat(), loc.getLocation().getLng()));
 }
 Double dist = SphericalUtil.computeLength(latLngs);