我怎样才能找到我在两个地点之间旅行的距离和时间？
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【中文标题】我怎样才能找到我在两个地点之间旅行的距离和时间？【英文标题】：How can i find distance and time taken by me to travel between two locations? 【发布时间】：2016-12-11 19:01:01 【问题描述】：假设我从绿色标记开始我的旅程并在红色标记结束我的旅程。如何计算我完成旅程所用的距离和时间？
我的代码是这样的：
public class MainActivity extends FragmentActivity implements OnMapReadyCallback, LocationListener
GoogleMap map;
LocationManager locationManager;
ArrayList<LatLng> markerPoints;
TextView tvDistanceDuration;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvDistanceDuration = (TextView) findViewById(R.id.tv_distance_time);
// Initializing
markerPoints = new ArrayList<LatLng>();
// Getting reference to SupportMapFragment of the activity_main
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting Map for the SupportMapFragment
fm.getMapAsync(this);
private String getDirectionsUrl(LatLng origin, LatLng dest)
// Origin of route
String str_origin = "origin=" + origin.latitude + "," + origin.longitude;
// Destination of route
String str_dest = "destination=" + dest.latitude + "," + dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin + "&" + str_dest + "&" + sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters;
return url;
/**
* A method to download json data from url
*/
private String downloadUrl(String strUrl) throws IOException
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null)
sb.append(line);
data = sb.toString();
br.close();
catch (Exception e)
Log.d("error downloading url", e.toString());
finally
iStream.close();
urlConnection.disconnect();
return data;
@Override
public void onMapReady(GoogleMap googleMap)
map = googleMap;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M)
if (checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
// TODO: Consider calling
// Activity#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 Activity#requestPermissions for more details.
return;
map.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
// TODO: Consider calling
// Activity#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 Activity#requestPermissions for more details.
return;
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null)
onLocationChanged(location);
locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
// Setting onclick event listener for the map
map.setOnMapClickListener(new OnMapClickListener()
@Override
public void onMapClick(LatLng point)
// Already two locations
if (markerPoints.size() > 1)
markerPoints.clear();
map.clear();
// Adding new item to the ArrayList
markerPoints.add(point);
// Creating MarkerOptions
MarkerOptions options = new MarkerOptions();
// Setting the position of the marker
options.position(point);
/**
* For the start location, the color of marker is GREEN and
* for the end location, the color of marker is RED.
*/
if (markerPoints.size() == 1)
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
else if (markerPoints.size() == 2)
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
// Add new marker to the Google Map Android API V2
map.addMarker(options);
// Checks, whether start and end locations are captured
if (markerPoints.size() >= 2)
LatLng origin = markerPoints.get(0);
LatLng dest = markerPoints.get(1);
// Getting URL to the Google Directions API
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
);
@Override
public void onLocationChanged(Location location)
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
map.setTrafficEnabled(true);
map.setBuildingsEnabled(true);
map.setIndoorEnabled(true);
map.getUiSettings().isCompassEnabled();
map.getUiSettings().isMyLocationButtonEnabled();
map.moveCamera(CameraUpdateFactory.newLatLng(latLng));
map.animateCamera(CameraUpdateFactory.zoomTo(16));
@Override
public void onStatusChanged(String s, int i, Bundle bundle)
@Override
public void onProviderEnabled(String s)
@Override
public void onProviderDisabled(String s)
// Fetches data from url passed
private class DownloadTask extends AsyncTask<String, Void, String>
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url)
// For storing data from web service
String data = "";
try
// Fetching the data from web service
data = downloadUrl(url[0]);
catch (Exception e)
Log.d("Background Task", e.toString());
return data;
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result)
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
/**
* A class to parse the Google Places in JSON format
*/
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String, String>>>>
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData)
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
catch (Exception e)
e.printStackTrace();
return routes;
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result)
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
MarkerOptions markerOptions = new MarkerOptions();
String distance = "";
String duration = "";
if (result.size() < 1)
Toast.makeText(getBaseContext(), "No Points", Toast.LENGTH_SHORT).show();
return;
// Traversing through all the routes
for (int i = 0; i < result.size(); i++)
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for (int j = 0; j < path.size(); j++)
HashMap<String, String> point = path.get(j);
if (j == 0) // Get distance from the list
distance = (String) point.get("distance");
continue;
else if (j == 1) // Get duration from the list
duration = (String) point.get("duration");
continue;
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
// Adding all the points in the route to LineOptions
lineOptions.addAll(points);
lineOptions.width(8);
lineOptions.color(Color.RED);
tvDistanceDuration.setText("Distance:" + distance + ", Duration:" + duration);
// Drawing polyline in the Google Map for the i-th route
map.addPolyline(lineOptions);
@Override
public boolean onCreateOptionsMenu(Menu menu)
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
【问题讨论】：
【参考方案1】：您可以查看此tutorial 关于“Google Map Android API 中两个位置之间的距离和旅行时间”。 Google Maps Directions API 是一项计算位置之间方向的服务。您可以搜索多种交通方式的路线，包括公交、驾车、步行或骑自行车。基本上，您需要对返回 JSON 的谷歌地图服务进行 http 调用，然后将您的 JSON 排序为可在 java 中使用的可读文本。
来自thread：
例如，来自Montreal to Toronto的路线：
GET http://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&sensor=false您最终会得到一些 JSON。在
routes[].legs[].distance，您将 得到一个像这样的对象："legs" : [ "distance" : "text" : "542 km", "value" : 542389 ,您也可以直接从响应中获取折线信息 对象。
您也可以查看此related SO question。希望这会有所帮助！
【讨论】：
2019 年 12 月：以上 URL 应以“https”而不是“http”开头。 有任何开源替代品吗？【参考方案2】：求距离：
locationA.distanceTo(locationB);
查找经过的时间：
location.getTime();
【讨论】：
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