Determining the speed of a vehicle using GPS in android

Question

I would like to know how to get the speed of a vehicle using your phone while seated in the vehicle using gps. I have read that the accelerometer is not very accurate. Anoth

Answer 1

We can use location.getSpeed();

  try {
                // Get the location manager
                double lat;
                double lon;
                double speed = 0;
                LocationManager locationManager = (LocationManager)
                        getActivity().getSystemService(LOCATION_SERVICE);
                Criteria criteria = new Criteria();
                String bestProvider = locationManager.getBestProvider(criteria, false);
                if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                    return;
                }
                Location location = locationManager.getLastKnownLocation(bestProvider);
                try {
                    lat = location.getLatitude();
                    lon = location.getLongitude();
                    speed =location.getSpeed();
                } catch (NullPointerException e) {
                    lat = -1.0;
                    lon = -1.0;
                }

                mTxt_lat.setText("" + lat);
                mTxt_speed.setText("" + speed);

            }catch (Exception ex){
                ex.printStackTrace();
            }