A Simple GPS Android Application

Here is the simple gps application to provide the current location coordinate by just a simple toasy .The app also notifies the gps is on or off when the application searches for the coordinates. This application has one java activity which includes all the classes and modules for this application.

Application inlcudes:

• location manager: This class provides access to the system location services. These services allow applications to obtain periodic updates of the device's geographical location.
  Includes
  getLastKnownLocation(String provider)

Returns a Location indicating the data from the last known location fix obtained from the given provider.

requestLocationUpdates(long minTime, float minDistance, Criteria criteria, PendingIntent intent)

Register for location updates using a Criteria and pending intent.

GPS_PROVIDER feature find the location using satellite. This feature requires uses permission ACCESS_FINE_LOCATION.

• Location Listener: Used for receiving notifications from the LocationManager when the location has changed.

import android.app.Activity;

import android.content.Context;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class Gps extends Activity {

private static final long UPDATES = 1;

private static final long TIME_FOR_UPDATE = 1000;

protected LocationManager locationManager;

protected Button retrieveLocationButton;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_gps);

retrieveLocationButton = (Button) findViewById(R.id.retrieve_location_button);

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

locationManager.requestLocationUpdates(

LocationManager.GPS_PROVIDER,

UPDATES,

TIME_FOR_UPDATES,

new MyLocationListener()

);

retrieveLocationButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

showCurrentLocation();

}

});

}

protected void showCurrentLocation() {

Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

if (location != null) {

String message = String.format(

"Current Location \n Longitude: %1$s \n Latitude: %2$s",

location.getLongitude(), location.getLatitude()

);

Toast.makeText(Gps.this, message,

Toast.LENGTH_LONG).show();

}

else{

Toast.makeText(Gps.this,"Signal is unclear",Toast.LENGTH_LONG).show();

}

}

private class MyLocationListener implements LocationListener {

public void onLocationChanged(Location location) {

String message = String.format(

"New Location \n Longitude: %1$s \n Latitude: %2$s",

location.getLongitude(), location.getLatitude()

);

Toast.makeText(Gps.this, message, Toast.LENGTH_LONG).show();

}

public void onStatusChanged(String s, int i, Bundle b) {

Toast.makeText(Gps.this, "Provider status changed",

Toast.LENGTH_LONG).show();

}

public void onProviderDisabled(String s) {

Toast.makeText(Gps.this,

"......Gps is disabled.....\n Please Enable",

Toast.LENGTH_LONG).show();

}

public void onProviderEnabled(String s) {

Toast.makeText(Gps.this,"......Gps is enabled.....",

Toast.LENGTH_LONG).show();

}

}

}

 onProviderEnabled is called when gps is enabled

 onProviderDisable is called when gps is disabled

When button pressed the desired message appeared