how to access interfaces's methods...please help "Android"

Hallo, I know this forum is not for Android Applications but i have faced a problem concerning java programming and i just need the concept and guidance to fix my problem.
my question is: how to access getRegisteredLocationLat() and getRegisteredLocationLong methods
note that: getRegisteredLocationLat() and getRegisteredLocationLong() I have implemented them inside the interface

Code:

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package com.androidbook.CarPosition;

import android.app.Activity;
import android.content.Context;
import android.location.GpsSatellite;
import android.location.GpsStatus;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;

public class CarPositionActivity extends Activity {
    /** Called when the activity is first created. */
       
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
       
        LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        LocationListener locationListener = new MyLocationListener();
        try
        {
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1, 2, locationListener);
        }
        catch(IllegalArgumentException e)
        {
                TextView tv1 = new TextView(this);
            tv1.setText("Provider or Lisetner is null");
            setContentView(tv1);       
        }
        catch(RuntimeException e)
        {
                TextView tv2 = new TextView(this);
            tv2.setText("No suitable permission or the calling thread has no looper");
            setContentView(tv2);
        }
        double latitude = ((MyLocationListener) locationListener).getRegisteredLocationLat();
        TextView tv3 = new TextView(this);
        tv3.setText(" "+latitude);
        setContentView(tv3);
       
       
    }
   
}

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Code:

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package com.androidbook.CarPosition;

import android.content.Context;
import android.content.ContextWrapper;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class MyLocationListener implements LocationListener {

        double longitude, latitude;
        @Override
        public void onLocationChanged(Location loc) {
                // TODO Auto-generated method stub
        loc.getLatitude();
        loc.getLongitude();
        Context context = null;
       
        String text = "current location is: " + "latitude = " +loc.getLatitude() +
                                                        "longitude = " +loc.getLongitude();
        setRegisteredLocationLat(loc.getLatitude());
        setRegisteredLocationLong(loc.getLongitude());
       
        Toast.makeText(context.getApplicationContext(), "location changed", Toast.LENGTH_SHORT).show();
        }

        public void setRegisteredLocationLat(double lat) {
                // TODO Auto-generated method stub
                latitude=lat;
        }
        public void setRegisteredLocationLong(double longi) {
                // TODO Auto-generated method stub
                longitude=longi;
        }
       
                public double getRegisteredLocationLong() {
                // TODO Auto-generated method stub
                return longitude;
        }

        public double getRegisteredLocationLat() {
                // TODO Auto-generated method stub
                return latitude;
        }



        @Override
        public void onProviderDisabled(String arg0) {
                // TODO Auto-generated method stub

        }

        @Override
        public void onProviderEnabled(String arg0) {
                // TODO Auto-generated method stub

        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
                // TODO Auto-generated method stub

        }

}

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Your question is quite chaotic, here's a question for you: are those getLat( ... ) and getLong( ... ) methods defined in the LocationListener interface? If they are, I don't see the problem? If they aren't, why not?

kind regards,

Jos

the originally LocationListener interface has:
public void onLocationChanged(Location loc)
public void onProviderDisabled(String arg0)
public void onProviderEnabled(String arg0)
public void onStatusChanged(String provider, int status, Bundle extras)

but I added the following methods to it:
getLat() and getLong
and I want to call these two

is it possible to call them?and how

Quote:

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Originally Posted by amrmb09

the originally LocationListener interface has:
public void onLocationChanged(Location loc)
public void onProviderDisabled(String arg0)
public void onProviderEnabled(String arg0)
public void onStatusChanged(String provider, int status, Bundle extras)

but I added the following methods to it:
getLat() and getLong
and I want to call these two

is it possible to call them?and how

---

If those methods were added to the interface definition then every class that implements the interface has to implement those methods. There wouldn't be any problem; I suspect you did something else but you are still being unclear ...

kind regards,

Jos

in the last line in the first java code...there are some comments to show how i have been calling thoses methods getLat() and getLong()
Please let me know wheather the way i followed to call them is right or wrong
thnks

Quote:

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Originally Posted by amrmb09

in the last line in the first java code...there are some comments to show how i have been calling thoses methods getLat() and getLong()
Please let me know wheather the way i followed to call them is right or wrong
thnks

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Well, if those methods were defined in that interface there wouldn't be any need to cast the object to a MyLocationListener (mind the capitalization). I still don't know what you did ...

kind regards,

Jos

Quote:

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Originally Posted by JosAH

Well, if those methods were defined in that interface there wouldn't be any need to cast the object to a MyLocationListener (mind the capitalization). I still don't know what you did ...

kind regards,

Jos

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the interface (LocationListener) basically doesnt has these 2 methods getLat() and getLong()
but because i need them i implemented them inside the class (MyLocationListener)that implemets LocationListener

Quote:

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Originally Posted by amrmb09

the interface (LocationListener) basically doesnt has these 2 methods getLat() and getLong()
but because i need them i implemented them inside the class (MyLocationListener)that implemets LocationListener

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Read my previous reply again: you need to cast your object to a MyLocationListener type/class because that type/class implements those methods; the interfaces doesn't. I consider it bad design.

kind regards,

Jos

Quote:

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Originally Posted by JosAH

Read my previous reply again: you need to cast your object to a MyLocationListener type/class because that type/class implements those methods; the interfaces doesn't. I consider it bad design.

kind regards,

Jos

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thanks alot ...Solved

Quote:

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Originally Posted by amrmb09

thanks alot ...Solved

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I still don't know what your original issue was; was it just a matter of capitalization of the class name?

kind regards,

Jos

i was just type casting with the wrong class
please see the above code
i modified it

regards,