您好吗能有人告诉我如何计算从Curent位置到另一个位置的总里程旅行？例如就像我从A点开始步行到达B点。我怎样才能找到从A点到B点的总距离。请帮帮我!!!
答案 0 :(得分：3)
假设您有位置start_location和finish_location。
所以你可以使用start_location.distanceTo(finish_location)
答案 1 :(得分：3)
Criteria c=new Criteria()
c.setAccuracy(Criteria.ACCURACY_FINE);
String providerName=locMgr.getBestProvider(c,true);
Location startLocation = new Location(providerName);
startLocation.setLatitude(PrevLatitude);
startLocation.setLongitude(PrevLongitude);
startLocation.set(startLocation);
Location _myLoc = new Location(providerName);
_myLoc.setLatitude(Double.valueOf(nf.format(location.getLatitude())));
_myLoc.setLongitude(Double.valueOf(nf.format(location.getLongitude())));
_myLoc.set(_myLoc);
double meters = _myLoc.distanceTo(startLocation);
double miles = (meters*0.000621371192237334);
答案 2 :(得分：0)
我在开源Gps Tracker中解决了这个问题。完整的Android项目在这里：
https://github.com/nickfox/GpsTracker/tree/master/phoneClients/android
以及进行跟踪的课程如下。您想要查看名为totalDistanceInMeters的变量。
package com.websmithing.gpstracker;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Location;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
public class LocationService extends Service implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,
LocationListener {
private static final String TAG = "LocationService";
// use the websmithing defaultUploadWebsite for testing and then check your
// location with your browser here: https://www.websmithing.com/gpstracker/displaymap.php
private String defaultUploadWebsite;
private boolean currentlyProcessingLocation = false;
private LocationRequest locationRequest;
private LocationClient locationClient;
@Override
public void onCreate() {
super.onCreate();
defaultUploadWebsite = getString(R.string.default_upload_website);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// if we are currently trying to get a location and the alarm manager has called this again,
// no need to start processing a new location.
if (!currentlyProcessingLocation) {
currentlyProcessingLocation = true;
startTracking();
}
return START_NOT_STICKY;
}
private void startTracking() {
Log.d(TAG, "startTracking");
if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) == ConnectionResult.SUCCESS) {
locationClient = new LocationClient(this,this,this);
if (!locationClient.isConnected() || !locationClient.isConnecting()) {
locationClient.connect();
}
} else {
Log.e(TAG, "unable to connect to google play services.");
}
}
protected void sendLocationDataToWebsite(Location location) {
// formatted for mysql datetime format
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
dateFormat.setTimeZone(TimeZone.getDefault());
Date date = new Date(location.getTime());
SharedPreferences sharedPreferences = this.getSharedPreferences("com.websmithing.gpstracker.prefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
float totalDistanceInMeters = sharedPreferences.getFloat("totalDistanceInMeters", 0f);
boolean firstTimeGettingPosition = sharedPreferences.getBoolean("firstTimeGettingPosition", true);
if (firstTimeGettingPosition) {
editor.putBoolean("firstTimeGettingPosition", false);
} else {
Location previousLocation = new Location("");
previousLocation.setLatitude(sharedPreferences.getFloat("previousLatitude", 0f));
previousLocation.setLongitude(sharedPreferences.getFloat("previousLongitude", 0f));
float distance = location.distanceTo(previousLocation);
totalDistanceInMeters += distance;
editor.putFloat("totalDistanceInMeters", totalDistanceInMeters);
}
editor.putFloat("previousLatitude", (float)location.getLatitude());
editor.putFloat("previousLongitude", (float)location.getLongitude());
editor.apply();
final RequestParams requestParams = new RequestParams();
requestParams.put("latitude", Double.toString(location.getLatitude()));
requestParams.put("longitude", Double.toString(location.getLongitude()));
Double speedInMilesPerHour = location.getSpeed()* 2.2369;
requestParams.put("speed", Integer.toString(speedInMilesPerHour.intValue()));
try {
requestParams.put("date", URLEncoder.encode(dateFormat.format(date), "UTF-8"));
} catch (UnsupportedEncodingException e) {}
requestParams.put("locationmethod", location.getProvider());
if (totalDistanceInMeters > 0) {
requestParams.put("distance", String.format("%.1f", totalDistanceInMeters / 1609)); // in miles,
} else {
requestParams.put("distance", "0.0"); // in miles
}
requestParams.put("username", sharedPreferences.getString("userName", ""));
requestParams.put("phonenumber", sharedPreferences.getString("appID", "")); // uuid
requestParams.put("sessionid", sharedPreferences.getString("sessionID", "")); // uuid
Double accuracyInFeet = location.getAccuracy()* 3.28;
requestParams.put("accuracy", Integer.toString(accuracyInFeet.intValue()));
Double altitudeInFeet = location.getAltitude() * 3.28;
requestParams.put("extrainfo", Integer.toString(altitudeInFeet.intValue()));
requestParams.put("eventtype", "android");
Float direction = location.getBearing();
requestParams.put("direction", Integer.toString(direction.intValue()));
final String uploadWebsite = sharedPreferences.getString("defaultUploadWebsite", defaultUploadWebsite);
LoopjHttpClient.get(uploadWebsite, requestParams, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, org.apache.http.Header[] headers, byte[] responseBody) {
LoopjHttpClient.debugLoopJ(TAG, "sendLocationDataToWebsite - success", uploadWebsite, requestParams, responseBody, headers, statusCode, null);
stopSelf();
}
@Override
public void onFailure(int statusCode, org.apache.http.Header[] headers, byte[] errorResponse, Throwable e) {
LoopjHttpClient.debugLoopJ(TAG, "sendLocationDataToWebsite - failure", uploadWebsite, requestParams, errorResponse, headers, statusCode, e);
stopSelf();
}
});
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onLocationChanged(Location location) {
if (location != null) {
Log.e(TAG, "position: " + location.getLatitude() + ", " + location.getLongitude() + " accuracy: " + location.getAccuracy());
// we have our desired accuracy of 500 meters so lets quit this service,
// onDestroy will be called and stop our location uodates
if (location.getAccuracy() < 500.0f) {
stopLocationUpdates();
sendLocationDataToWebsite(location);
}
}
}
private void stopLocationUpdates() {
if (locationClient != null && locationClient.isConnected()) {
locationClient.removeLocationUpdates(this);
locationClient.disconnect();
}
}
/**
* Called by Location Services when the request to connect the
* client finishes successfully. At this point, you can
* request the current location or start periodic updates
*/
@Override
public void onConnected(Bundle bundle) {
Log.d(TAG, "onConnected");
locationRequest = LocationRequest.create();
locationRequest.setInterval(1000); // milliseconds
locationRequest.setFastestInterval(1000); // the fastest rate in milliseconds at which your app can handle location updates
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationClient.requestLocationUpdates(locationRequest, this);
}
/**
* Called by Location Services if the connection to the
* location client drops because of an error.
*/
@Override
public void onDisconnected() {
Log.e(TAG, "onDisconnected");
stopLocationUpdates();
stopSelf();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.e(TAG, "onConnectionFailed");
stopLocationUpdates();
stopSelf();
}
}