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Tuesday, April 2, 2013

Android get current GPS location

You can Find location either GPS_PROVIDER or NETWORK_PROVIDER
Overview of location services in Android , LocationManager class at the heart of location services in Android.
Here is one example which try to find location using GPS , if your GPS not available then try to use network for find location

Demo Code

Activity - AndroidGPSTrackingActivity.java

public class AndroidGPSTrackingActivity extends Activity {
  
    Button btnShowLocation;
  
    // GPSTracker class
    GPSTracker gps;
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
      
        btnShowLocation = (Button) findViewById(R.id.btnShowLocation);
      
        // show location button click event
        btnShowLocation.setOnClickListener(new View.OnClickListener() {
          
            @Override
            public void onClick(View arg0) {      
                // create class object
                gps = new GPSTracker(AndroidGPSTrackingActivity.this);

                // check if GPS enabled      
                if(gps.canGetLocation()){
                  
                    double latitude = gps.getLatitude();
                    double longitude = gps.getLongitude();
                  
                    // \n is for new line
                    Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();  
                }else{
                    // can't get location
                    // GPS or Network is not enabled
                    // Ask user to enable GPS/network in settings
                    gps.showSettingsAlert();
                }
              
            }
        });
    }
  
}


GPSTracke.java
public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }
  
    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }      
    }
  
    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }
      
        // return latitude
        return latitude;
    }
  
    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }
      
        // return longitude
        return longitude;
    }
  
    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }
  
    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
       
        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

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

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}
Layout - main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
   
    <Button android:id="@+id/btnShowLocation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Location"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"/>

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


17 comments:

  1. muy buen tutorial, esta bueno para obtener la ubicacion por gps.

    saludos cordiales
    Consigue moviles dual sim al mejor precio

    ReplyDelete
  2. tienes alguna opción para descargar el código

    ReplyDelete
  3. Good, it's really usefull for discover how to test the geolocalisation but I think you can slightly optimize your code using "if(isNetworkEnabled){...}else if(isGPSEnabled){...}" instead of "if(isNetworkEnabled){...} if(isGPSEnabled){...}".
    Unless it is done on purpose ! ^^

    ReplyDelete
  4. Good tutorial.
    Can you export the project to us?

    ReplyDelete
  5. Crazy that Google doesn't provide any example code with their documentation... this worked a treat though, thanks

    ReplyDelete
  6. If you try to find these coordinates they lead to the Google Headquarters on Mountain View XD.
    Thanks for the tutorial.

    ReplyDelete
  7. thanks for the tutorial! However after clicking the show location button, im getting the dialog box of asking me to enable the GPS location service even after i have turned on the GPS. Any clues of why??

    ReplyDelete
  8. Thanks for this tutorial, by inspiring with this tutorial i have created a program in which GPS running in services, my program running well but my problem is whenever i am driving for few minutes its work fine its update longitude and latitude but after some time this will not updating longitude and latitude and terminate my program if you have any idea why this is happen please guide me with solution thanks in advance

    ReplyDelete
  9. great work.....please provide the source code.

    ReplyDelete
  10. thanx a lot ... just what i needed ... !!!

    ReplyDelete
  11. This comment has been removed by the author.

    ReplyDelete
  12. GPS Provider does not give coordinates it give lat:0 and long:0!!! help me

    ReplyDelete
  13. Super tutorial Thanks Lot...........................

    ReplyDelete
  14. Thank you very much it works

    ReplyDelete
  15. How to get the location name other than Latitude and Longitude
    Can any one help me

    ReplyDelete