Android studio location distanceto

Android Location.distanceBetween and Location.distanceTo difference

I encounter some issues on trying to calculate distance between one location and a list of others (in order to get the closest one). I tried by using Location.distanceBetween(. ) and location.distanceTo(. ), the two method are working but both of them send me different data and not any of them seems right.

My data came from a Class ConcessionDistance which is a basic extension of HashMap containing location data (as integer convert as string) and some other stuff that we don’t need here.

Can some one help me, to figure out where is the problem? I think of a conversion problem but I’m to deep in the problem to solve it myself 🙁

Any help will be welcome. Thanks by advance.

Edit: Here is part of my LogCat: I send to the emulator the gps location of «Strasbourg» (those are cities from east-france) and process distance to all those cities:

The real distance (given by google maps) between those cities and «Strasbourg» are :
Evry : 520km ( method1 : miss 175km, method2 : miss 145km)
Haguenau : 30km ( method1: add 70km, method2: return 0)
Besancon : 250km (method1: miss 140km, method2: miss 120km)
Brest : 1070km (method1: miss 200km, method2: miss 230km)
Hoenheim : 5km (method1: add 80km, method2: return 0)
Colmar : 75km (method1: miss 50km, method2: return 0)
Belfort : 155km (method1: miss 110km, method2: miss 20km)
Sarrebourg : 75km (method1: miss 5km, method2: return 0)

So we can notice that the second method return 0 when real distance is below

100km, wherease for the method1 I can’t see any logic inhere :/

Источник

Calculating distance between two geographic locations

please shed some light on this situation

Right now i have two array having latitude and longitude of nearby places and also have the user location latiude and longiude now i want to calculate the distance between user location and nearby places and want to show them in listview.

I know that there is a method for calculating distance as

Now what is the problem is how to pass these two array having nearby latitude and longitue in this method and get the array of distances.

7 Answers 7

Look into distanceTo

Returns the approximate distance in meters between this location and the given location. Distance is defined using the WGS84 ellipsoid.

Computes the approximate distance in meters between two locations, and optionally the initial and final bearings of the shortest path between them. Distance and bearing are defined using the WGS84 ellipsoid.

You can create a Location object from a latitude and longitude:

Try This Code. here we have two longitude and latitude values and selected_location.distanceTo(near_locations) function returns the distance between those places in meters.

here «distance» is distance between locationA & locationB (in Meters )

There is only one user Location, so you can iterate List of nearby places can call the distanceTo() function to get the distance, you can store in an array if you like.

From what I understand, distanceBetween() is for far away places, it’s output is a WGS84 ellipsoid.

distanceTo will give you the distance in meters between the two given location ej target.distanceTo(destination).

distanceBetween give you the distance also but it will store the distance in a array of float( results[0]). the doc says If results has length 2 or greater, the initial bearing is stored in results[1]. If results has length 3 or greater, the final bearing is stored in results[2]

hope that this helps

i’ve used distanceTo to get the distance from point A to B i think that is the way to go.

Источник

Get the distance between two locations in android?

i need to get distance between two location, but i need to get distance like blue line in the picture.

but i get red line distance.

10 Answers 10

Use the Google Maps Directions API. You’ll need to request the directions over HTTP. You can do this directly from Android, or via your own server.

For example, directions from Montreal to Toronto:

You’ll end up with some JSON. In routes[].legs[].distance , you’ll get an object like this:

You can also get the polyline information directly from the response object.

As Chris Broadfoot is correct, to parse returned JSON routes[].legs[].distance

You can use following method of Location class in android (if u have lat, longs of both the locations) the method returns approximate distance in meters.

public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)

Explanation:

Computes the approximate distance in meters between two locations, and optionally the initial and final bearings of the shortest path between them. Distance and bearing are defined using the WGS84 ellipsoid.

The computed distance is stored in results[0] . If results has length 2 or greater, the initial bearing is stored in results[1] . If results has length 3 or greater, the final bearing is stored in results[2] . Parameters:

startLatitude — the starting latitude

startLongitude the starting longitude

endLatitude the ending latitude

endLongitude the ending longitude

results an array of floats to hold the results

Источник

Android — Location Based Services

Android location APIs make it easy for you to build location-aware applications, without needing to focus on the details of the underlying location technology.

This becomes possible with the help of Google Play services, which facilitates adding location awareness to your app with automated location tracking, geofencing, and activity recognition.

This tutorial shows you how to use Location Services in your APP to get the current location, get periodic location updates, look up addresses etc.

The Location Object

The Location object represents a geographic location which can consist of a latitude, longitude, time stamp, and other information such as bearing, altitude and velocity. There are following important methods which you can use with Location object to get location specific information −

float distanceTo(Location dest)

Returns the approximate distance in meters between this location and the given location.

Get the estimated accuracy of this location, in meters.

Get the altitude if available, in meters above sea level.

Get the bearing, in degrees.

Get the latitude, in degrees.

Get the longitude, in degrees.

Get the speed if it is available, in meters/second over ground.

True if this location has an accuracy.

True if this location has an altitude.

True if this location has a bearing.

True if this location has a speed.

Clears the contents of the location.

void setAccuracy(float accuracy)

Set the estimated accuracy of this location, meters.

void setAltitude(double altitude)

Set the altitude, in meters above sea level.

void setBearing(float bearing)

Set the bearing, in degrees.

void setLatitude(double latitude)

Set the latitude, in degrees.

void setLongitude(double longitude)

Set the longitude, in degrees.

void setSpeed(float speed)

Set the speed, in meters/second over ground.

Returns a string containing a concise, human-readable description of this object.

Get the Current Location

To get the current location, create a location client which is LocationClient object, connect it to Location Services using connect() method, and then call its getLastLocation() method. This method returns the most recent location in the form of Location object that contains latitude and longitude coordinates and other information as explained above. To have location based functionality in your activity, you will have to implement two interfaces −

These interfaces provide following important callback methods, which you need to implement in your activity class −

Sr.No.	Method & Description
1

abstract void onConnected(Bundle connectionHint)

This callback method is called when location service is connected to the location client successfully. You will use connect() method to connect to the location client.

abstract void onDisconnected()

This callback method is called when the client is disconnected. You will use disconnect() method to disconnect from the location client.

abstract void onConnectionFailed(ConnectionResult result)

This callback method is called when there was an error connecting the client to the service.

You should create the location client in onCreate() method of your activity class, then connect it in onStart(), so that Location Services maintains the current location while your activity is fully visible. You should disconnect the client in onStop() method, so that when your app is not visible, Location Services is not maintaining the current location. This helps in saving battery power up-to a large extent.

Get the Updated Location

If you are willing to have location updates, then apart from above mentioned interfaces, you will need to implement LocationListener interface as well. This interface provide following callback method, which you need to implement in your activity class −

Sr.No.	Callback Methods & Description
1

abstract void onLocationChanged(Location location)

This callback method is used for receiving notifications from the LocationClient when the location has changed.

Location Quality of Service

The LocationRequest object is used to request a quality of service (QoS) for location updates from the LocationClient. There are following useful setter methods which you can use to handle QoS. There are equivalent getter methods available which you can check in Android official documentation.

Sr.No.	Callback Method & Description
1

Set the duration of this request, in milliseconds.

Set the request expiration time, in millisecond since boot.

Explicitly set the fastest interval for location updates, in milliseconds.

Set the desired interval for active location updates, in milliseconds.

Set the number of location updates.

Set the priority of the request.

Now for example, if your application wants high accuracy location it should create a location request with setPriority(int) set to PRIORITY_HIGH_ACCURACY and setInterval(long) to 5 seconds. You can also use bigger interval and/or other priorities like PRIORITY_LOW_POWER for to request «city» level accuracy or PRIORITY_BALANCED_POWER_ACCURACY for «block» level accuracy.

Activities should strongly consider removing all location request when entering the background (for example at onPause()), or at least swap the request to a larger interval and lower quality to save power consumption.

Displaying a Location Address

Once you have Location object, you can use Geocoder.getFromLocation() method to get an address for a given latitude and longitude. This method is synchronous, and may take a long time to do its work, so you should call the method from the doInBackground() method of an AsyncTask class.

The AsyncTask must be subclassed to be used and the subclass will override doInBackground(Params. ) method to perform a task in the background and onPostExecute(Result) method is invoked on the UI thread after the background computation finishes and at the time to display the result. There is one more important method available in AyncTask which is execute(Params. params), this method executes the task with the specified parameters.

Example

Following example shows you in practical how to to use Location Services in your app to get the current location and its equivalent addresses etc.

To experiment with this example, you will need actual Mobile device equipped with latest Android OS, otherwise you will have to struggle with emulator which may not work.

Create Android Application

Sr.No.	Method & Description
1

Step	Description
1	You will use Android studio IDE to create an Android application and name it as Tutorialspoint under a package com.example.tutorialspoint7.myapplication.
2	add src/GPSTracker.java file and add required code.
3	Modify src/MainActivity.java file and add required code as shown below to take care of getting current location and its equivalent address.
4	Modify layout XML file res/layout/activity_main.xml to add all GUI components which include three buttons and two text views to show location/address.
5	Modify res/values/strings.xml to define required constant values
6	Modify AndroidManifest.xml as shown below
7	Run the application to launch Android emulator and verify the result of the changes done in the application.

Following is the content of the modified main activity file MainActivity.java.

Following is the content of the modified main activity file GPSTracker.java.

Following will be the content of res/layout/activity_main.xml file −

Following will be the content of res/values/strings.xml to define two new constants −

Following is the default content of AndroidManifest.xml −

Let’s try to run your Tutorialspoint application. I assume that, you have connected your actual Android Mobile device with your computer. To run the app from Android Studio, open one of your project’s activity files and click Run icon from the toolbar. Before starting your application, Android studio installer will display following window to select an option where you want to run your Android application.

Now to see location select Get Location Button which will display location information as follows −

Источник