如何使用谷歌地图跟踪用户全天位置？ [英] How to track users full day location using google map?
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问题描述
我想要建议如何跟踪谷歌地图中时间线整日的用户位置。
我有两个想法
1.例如，如果我每天有200 latlng如何在Google地图中传递整天的latlng值。分
我有一个
解决方案
如果您有200 LatLng点，则始终可以将它们绘制为 polyline ：
...
final List< LatLng> polylinePoints = new ArrayList<>（）;
polylinePoints.add（new LatLng（< Point1_Lat>，< Point1_Lng>））;
polylinePoints.add（new LatLng（< Point2_Lat>，< Point2_Lng>））;
...
最终Polyline polyline = mGoogleMap.addPolyline（新PolylineOptions（）
.addAll（polylinePoints）
.color（Color.BLUE）
.width（20））;
，如果需要的话，用 Snap to Road 部分
...
List< rel =nofollow noreferrer> Google Maps Roads API ;经纬度> snappedPoints = new ArrayList<>（）;
new GetSnappedPointsAsyncTask（）。execute（polylinePoints，null，snappedPoints）;
...
private class GetSnappedPointsAsyncTask extends AsyncTask< List< LatLng>，Void，List< LatLng>> {
保护无效onPreExecute（）{
super.onPreExecute（）;
}
保护列表< LatLng> doInBackground（List< LatLng> ... params）{
List< LatLng> snappedPoints = new ArrayList<>（）;
HttpURLConnection连接= null;
BufferedReader reader = null;
尝试{
URL url = new URL（buildRequestUrl（params [0]））;
connection =（HttpURLConnection）url.openConnection（）;
connection.setRequestMethod（GET）;
connection.connect（）;
InputStream stream = connection.getInputStream（）;
reader = new BufferedReader（new InputStreamReader（stream））;
StringBuilder jsonStringBuilder = new StringBuilder（）;
StringBuffer buffer = new StringBuffer（）;
String line =; （（line = reader.readLine（））！= null）{
buffer.append（line +\\\
）;
jsonStringBuilder.append（line）;
jsonStringBuilder.append（\\\
）;
}
JSONObject jsonObject = new JSONObject（jsonStringBuilder.toString（））;
JSONArray snappedPointsArr = jsonObject.getJSONArray（snappedPoints）; （）; getBSONObject（（））;
for（int i = 0; i< snappedPointsArr.length（）; i ++）{
JSONObject snappedPointLocation =（（JSONObject）（snappedPointsArr.get（i）））。getJSONObject 位置）;
double lattitude = snappedPointLocation.getDouble（latitude）;
double longitude = snappedPointLocation.getDouble（longitude）;
snappedPoints.add（new LatLng（lattitude，longitude））;
}
} catch（MalformedURLException e）{
e.printStackTrace（）;
} catch（IOException e）{
e.printStackTrace（）;
} catch（JSONException e）{
e.printStackTrace（）;
} finally {
if（connection！= null）{
connection.disconnect（）;
}
尝试{
if（reader！= null）{
reader.close（）;
}
} catch（IOException e）{
e.printStackTrace（）;
}
}
return snappedPoints;
}
@Override
保护无效onPostExecute（List< LatLng>结果）{
super.onPostExecute（result）;
PolylineOptions polyLineOptions = new PolylineOptions（）;
polyLineOptions.addAll（result）;
polyLineOptions.width（5）;
polyLineOptions.color（Color.RED）;
mGoogleMap.addPolyline（polyLineOptions）;
LatLngBounds.Builder builder = new LatLngBounds.Builder（）;
builder.include（result.get（0））;
builder.include（result.get（result.size（） - 1））;
LatLngBounds bounds = builder.build（）;
mGoogleMap.animateCamera（CameraUpdateFactory.newLatLngBounds（bounds，10））;
private String buildRequestUrl（List< LatLng> trackPoints）{
StringBuilder url = new StringBuilder（）;
url.append（https://roads.googleapis.com/v1/snapToRoads?path=）; （LatLng trackPoint：trackPoints）{
url.append（String.format（％8.5f，trackPoint.latitude））;
url.append（，）;
url.append（String.format（％8.5f，trackPoint.longitude））;
url.append（|）;
}
url.delete（url.length（） - 1，url.length（））;
url.append（& interpolate = true）;
url.append（String.format（& key =％s，< your_Google_Maps_API_key>）;
return url.toString（）;
}
如果相邻点之间的距离太大，可以使用 Waypoint 的一部分路线API 以获取该点之间的路线，并绘制折线和航点请求的结果。
I want suggestion How to track location of user for entire day like timeline in Google maps.
I have two ideas
1.For example If i have 200 latlng per day how to pass whole day latlng values in google map. points I got one google doc reference in that i can track upto 10 locations points only
2.Idea two : Is there any google api to track user entire day & make a timeline for it
解决方案
If you have 200 LatLng point you always can just draw them as polyline:
...
final List<LatLng> polylinePoints = new ArrayList<>();
polylinePoints.add(new LatLng(<Point1_Lat>, <Point1_Lng>));
polylinePoints.add(new LatLng(<Point2_Lat>, <Point2_Lng>));
...
final Polyline polyline = mGoogleMap.addPolyline(new PolylineOptions()
.addAll(polylinePoints)
.color(Color.BLUE)
.width(20));
and, if you need, snap them to roads with Snap to Road part of Google Maps Roads API:
...
List<LatLng> snappedPoints = new ArrayList<>();
new GetSnappedPointsAsyncTask().execute(polylinePoints, null, snappedPoints);
...
private class GetSnappedPointsAsyncTask extends AsyncTask<List<LatLng>, Void, List<LatLng>> {
protected void onPreExecute() {
super.onPreExecute();
}
protected List<LatLng> doInBackground(List<LatLng>... params) {
List<LatLng> snappedPoints = new ArrayList<>();
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(buildRequestUrl(params[0]));
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuilder jsonStringBuilder = new StringBuilder();
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line+"\n");
jsonStringBuilder.append(line);
jsonStringBuilder.append("\n");
}
JSONObject jsonObject = new JSONObject(jsonStringBuilder.toString());
JSONArray snappedPointsArr = jsonObject.getJSONArray("snappedPoints");
for (int i = 0; i < snappedPointsArr.length(); i++) {
JSONObject snappedPointLocation = ((JSONObject) (snappedPointsArr.get(i))).getJSONObject("location");
double lattitude = snappedPointLocation.getDouble("latitude");
double longitude = snappedPointLocation.getDouble("longitude");
snappedPoints.add(new LatLng(lattitude, longitude));
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return snappedPoints;
}
@Override
protected void onPostExecute(List<LatLng> result) {
super.onPostExecute(result);
PolylineOptions polyLineOptions = new PolylineOptions();
polyLineOptions.addAll(result);
polyLineOptions.width(5);
polyLineOptions.color(Color.RED);
mGoogleMap.addPolyline(polyLineOptions);
LatLngBounds.Builder builder = new LatLngBounds.Builder();
builder.include(result.get(0));
builder.include(result.get(result.size()-1));
LatLngBounds bounds = builder.build();
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 10));
}
}
private String buildRequestUrl(List<LatLng> trackPoints) {
StringBuilder url = new StringBuilder();
url.append("https://roads.googleapis.com/v1/snapToRoads?path=");
for (LatLng trackPoint : trackPoints) {
url.append(String.format("%8.5f", trackPoint.latitude));
url.append(",");
url.append(String.format("%8.5f", trackPoint.longitude));
url.append("|");
}
url.delete(url.length() - 1, url.length());
url.append("&interpolate=true");
url.append(String.format("&key=%s", <your_Google_Maps_API_key>);
return url.toString();
}
If distance between adjacent points too big, you can use Waypoints part of Directions API to get directions between that points and draw polyline with results of waypoints request.
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