got some errors when using "requesLocationUpdates()"

Question

I have an app which shows users current coordinates and update it as every 5 meters. but i have problem in the line which i call for "requestLocationUpdates" which is in this line:

 Location location1 = locationManager.requestLocationUpdates(GpsProvider, 0, MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, mylocationListener);

.

if i place Context as last parameter i will get an error which tells(note that "GpsTracker" is my Main Activity) :

"Cannot resolve method 'requestLocationUpdates(java.lang.String, int, long, com.project.gpstrackerr.GpsTracker)'"

and if i place my locationlistener i will get an error which tells:

Incompatible types.
Required:android.location.Location
Found:void

here is my Full code of my GpsTracker Activity(which is my Main Activity)

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.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.text.SimpleDateFormat;
import java.util.Date;

public class GpsTracker extends Activity
{
    public static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1;
    private static final long MINIMUM_TIME_BETWEEN_UPDATES = 20;
    boolean isGPSEnabled = false, isNetworkEnabled = false;
    boolean isGPSEnabled2 = false, isNetworkEnabled2 = false;

    DatabaseTable cn;
    DatabaseManager db = new DatabaseManager(this);
    HttpClass JSONSaver = new HttpClass();
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    Date date = new Date();
    Context context = GpsTracker.this;
    LocationManager locationManager, locationManagerCHECK;
    TextView ET_Coordinates, ET_NU;
    ListView listView;

    //for Coordinates details in Location Listener
    double latitude;
    double longitude;
    String Date;
    //for Getting Coordinates details
    String strLat, strLong, strDate;

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

        //Show Last Known Location
        ShowLastKnownLocation();

        String NetworkProvider = LocationManager.NETWORK_PROVIDER;
        String GpsProvider = LocationManager.GPS_PROVIDER;
        locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
        isGPSEnabled2 = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        isNetworkEnabled2 = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

    }
    public LocationListener mylocationListener = new LocationListener()
    {
        @Override
        public void onLocationChanged(Location location)
        {

            Date date = new Date();
            Date = dateFormat.format(date);
            latitude = location.getLatitude();
            longitude = location.getLongitude();
        }
        @Override
        public void onStatusChanged(String provider, int status, Bundle extras)
        {
            Toast.makeText(GpsTracker.this, "Provide Status Changed" + "\n"
                            + "Provider: " + provider + "\n"
                            + "Status: " + status + "\n"
                            + "Extras: " + extras + ".",
                    Toast.LENGTH_LONG).show();
        }
        @Override
        public void onProviderEnabled(String provider)
        {
            Toast.makeText(GpsTracker.this,
                    "Provider Turned ON!", Toast.LENGTH_SHORT).show();
        }
        @Override
        public void onProviderDisabled(String provider)
        {
            Toast.makeText(GpsTracker.this,
                    "Provider is OFF!", Toast.LENGTH_SHORT).show();
        }
    };

    protected void showUpdatedLocation(boolean checkGPSEnabled, boolean checkNetworkEnabled, String NetworkProvider, String GpsProvider, LocationManager locationManager)
    {
        if (checkGPSEnabled)
        {
           //I have problem in this Line
            Location location1 = locationManager.requestLocationUpdates(GpsProvider, 0, MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, mylocationListener);

            if (location1 != null)
            {
                Date = dateFormat.format(date);
                latitude = location1.getLatitude();
                longitude = location1.getLongitude();

                db.addContact(new DatabaseTable(Date, latitude, longitude));
                JSONSaver.writeJSON(Date, latitude, longitude);
                showOnTextView(Date, latitude, longitude);
            }
        }
        else if (isNetworkEnabled2)
        {
            Location location1 = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

            if (location1 != null)
            {
                //I have problem in this Line
            Location location1 = locationManager.requestLocationUpdates(NetworkProvider, 0, MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, mylocationListener);

                Date = dateFormat.format(date);
                latitude = location1.getLatitude();
                longitude = location1.getLongitude();

                db.addContact(new DatabaseTable(Date, latitude, longitude));
                JSONSaver.writeJSON(Date, latitude, longitude);
                showOnTextView(Date, latitude, longitude);
            }
        }
    }
}

I want to know where is my problem and how can i solve it and which of them(Context or LocationListener) is better to be used for doing my job.

It's my first time that i ask a question in Stackoverflow so if explanations have some lacks or i was not very clear or any other problems, feel free to ask for more information in comments I will try to be as much as clear i can. and beside of that I'm Kind of New to Programming so if you find something Stupid in my codes Don't get Surprised :D. Thanks for Further Helps!

Answer 1

Thanks for all people who helped me! the problem was for the package i used that was:

import android.location.LocationListener;

I used next package instead of first package:

import com.google.android.gms.location.LocationListener;

using this package in @chiru 's script will work fine for me!

Thanks A Lot Again!