CODEWITHSUNDEEP
androidgpsquery-string
manuelmejiaio
manuelmejiaio

Reputation: 7017

How to send my GPS location (Latitude,Longitude) in a query string?

I need to make a simple application for android that send the location of my smartphone every 25 seconds to a Web-app. My Web-app is online and right now i can pass the value manually like this:

http://mywebapp.com/coordinates/create?latitude=18.463108&longitude=-69.929117

I'm an absolute beginner to Android development, so try to explain me step by step.

Upvotes: 5

Views: 8587

Answers (2)

manuelmejiaio
manuelmejiaio

Reputation: 7017

After doing a deep research, I found what I think is the easiest way to send GPS location (Latitude,Longitude) in a query string. Maybe there's no shorter code in the web than this. So we'll do this in 2 steps:

  1. First add this permissions to the AndroidManifest.xml

    <uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

  2. Now the code in your MainActivity.java inside the class public class MainActivity extends Activity { }

    public class MainActivity extends Activity {

    public double latitude;
    public double longitude;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /* Use the LocationManager class to obtain GPS locations */
        LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        LocationListener mlocListener = new MyLocationListener();
        mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
    }

    /* Class My Location Listener */

    public class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {
            latitude = loc.getLatitude();
            longitude = loc.getLongitude();
            String Text = "My current Latitude = " + latitude  + " Longitude = " + longitude;
            Toast.makeText( getApplicationContext(),Text,Toast.LENGTH_SHORT).show();

            SendQueryString(); // for send the  Query String of latitude and logintude to the webapp.
        }



        @Override
        public void onProviderDisabled(String provider) {   
            Toast.makeText( getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT ).show();
        }


        @Override
        public void onProviderEnabled(String provider) {
            Toast.makeText( getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();
        }


        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
        }

    }/* End of Class MyLocationListener */


    public void SendQueryString() {
        new Thread() {  
            public void run() {

                String url = "http://mywebapp.com/coordinates/create?latitude=" + latitude +"&longitude=" + longitude;

                try {
                    HttpClient Client = new DefaultHttpClient();
                    HttpGet httpget = new HttpGet(url);
                    Client.execute(httpget);
                }
                catch(Exception ex) {
                    String fail = "Fail!";
                    Toast.makeText( getApplicationContext(),fail,Toast.LENGTH_SHORT).show();
                }
            }
        }.start();
    }
}

NOTE: As you can see I'm using new Thread() { public void run() {/*code here*/}}.start(); in the function SendQueryString(), that's because we're trying to make a request to a server, so in Android you can't make a request to a server in the principal Thread, where the graphics and principal process are. In fact it'll return an error if you try to make a request in the principal Thread.

Upvotes: 8

elmorabea
elmorabea

Reputation: 3263

First get location:

LocationManager locMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locMan.requestLocationUpdates(
    LocationManager.GPS_PROVIDER, 0, 0, location listener);

The first zero represents the time interval of the location updating The second one represents the distance interval of the updating .. configure as you will.

And in the listener:

public void onLocationChanged(Location location) {
if (location != null) {
    double lat = location.getLatitude();
    double long = location.getLongitude();
   }
}

You just have to a make an http request with that link like the following:

String url = "http://mywebapp.com/coordinates/createlatitude=" + lat +"&longitude=" + long;
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
httpClient.execute(httpGet);

Upvotes: 0

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