Android : How can I print an Image on a ListView?

I'm at the beginning with android and I'm trying to do a ListView with images on the left and some textviews on the right. I wanna use Picasso to show images, because I think is the easyest way to load images from the web. But I have some problems and I don't know how to do it. Below my code: Thank you so much !

InterestPoint.java:

package com.example.findmyclients;

import android.webkit.WebView.FindListener;
import android.widget.ImageView;

public class InterestPoint {

    public String nome;
    public String categoria;
    public String apiedi;
    public String inauto;
}

ListviewActivity.java:

package com.example.findmyclients;

import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;


import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class ListviewActivity extends Activity{

private ListView lista;
private ListView listaNOGPS;
private List<InterestPoint> listaInteressPoint;
private List<InterestPoint> listaInteressPointNOGPS;
private InterestPoint ip;
private CustomListAdapter adapter;
private CustomListAdapter adapterNOGPS;

public String [][]ArrayTime = new String[1000][7];  //La matrice che conterrà tutti i dati relativi alla lista

public String [][]Dati_history = new String[100][10];
public String [][]Dati_restaurant = new String[100][10];
public String [][]Dati_hotel = new String[100][10];
public String [][]Dati_souvenir = new String[100][10];
public String pathdirectory = "/sdcard/PredappioLiving/";

String[]file_names={"markers_history.xml", "markers_hotel.xml", "markers_restaurant.xml", "markers_souvenir.xml"};
String[]Array_Cat={"Monumenti","Alloggi","Ristoranti","Negozi"};

int nome_luogo = 0;
int categoria = 1;
int auto = 2;
int piedi = 3;
int latitude = 4;
int longitude = 5;
int url_anteprima_immagine=6;

int gps_on= 0;



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

        final Activity thiz = this;

        //Get ListView Object from xml
        lista = (ListView) thiz.findViewById(R.id.lista);
        listaNOGPS = (ListView) thiz.findViewById(R.id.lista);

        GPSTracker gpstrack = new GPSTracker(this);
        if (gpstrack.canGetLocation() ) {
            gps_on = 1;
        }

        /* - - - Costruzione della matrice dall'xml - - - */
        /* - - - - - - - - - - - - - - - - - - - - - - - -*/
        int file_choice=-1;
        int n = 0;  //mi serve per riempire bene tutta la matrice
        for (int i = 0; i<file_names.length; i++)
        {
            String file_path = pathdirectory+file_names[i];
            int indice_riempimento = n;

            int returnhistory = file_names[i].compareTo("markers_history.xml");
            int returnhotel = file_names[i].compareTo("markers_hotel.xml");
            int returnrestaurant = file_names[i].compareTo("markers_restaurant.xml");
            int returnsouvenir = file_names[i].compareTo("markers_souvenir.xml");

            if (returnhistory == 0){
                file_choice = 0;
            }
            if (returnhotel == 0){
                file_choice = 1;
            }
            if (returnrestaurant == 0){
                file_choice = 2;
            }
            if (returnsouvenir == 0){
                file_choice = 3;
            }

            // Inizio lettura da XML e popolazione della matrice

            try
            {
                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                DocumentBuilder builder = factory.newDocumentBuilder();
                Document doc = builder.parse(new FileInputStream(file_path));
                doc.getDocumentElement().normalize();

                NodeList nodi = doc.getElementsByTagName("marker");



                for (int c = 0; c<nodi.getLength(); c++)
                {
                    Element item = (Element) nodi.item(c);
                    String nome = item.getAttribute("name");
                    String destLat = item.getAttribute("lat");
                    String destLong = item.getAttribute("long");
                    String urlimmagine = item.getAttribute("immagine");

                    Double lat = Double.valueOf(destLat);
                    Double lon = Double.valueOf(destLong);

                    GPSTracker gpsTracker = new GPSTracker(this);

                    String stringMyLatitude = String.valueOf(gpsTracker.latitude);
                    String stringMyLongitude = String.valueOf(gpsTracker.longitude);

                    double currentLat = Double.parseDouble(stringMyLatitude);
                    double currentLong = Double.parseDouble(stringMyLongitude);

                    final float[]distanzadouble = new float[3];
                    Location.distanceBetween(currentLat, currentLong, lat, lon, distanzadouble);

                    float metri = distanzadouble[0];
                    float km = Math.round((double)metri/1000);

                    int minuti_persona = (int)Math.round(metri/125);    //125 metri al minuto -> velocità media di 2,5 m/s
                    int minuti_auto = (int)Math.round(km/0.7);          //700 metri al minuto -> velocità media di 42 km/h 

                    String string_min_a_piedi;
                    String string_min_in_auto;

                    if(minuti_persona <=0)          // Stampa tempo per coprire la distanza
                    {
                        string_min_a_piedi="meno di un minuto";
                    }else
                    {
                        string_min_a_piedi=String.valueOf(minuti_persona);
                    }

                    if(minuti_auto <= 0)
                    {
                        string_min_in_auto="meno di un minuto";                                 
                    }else
                    {
                        string_min_in_auto= String.valueOf(minuti_auto);
                    }

                    ArrayTime[c+n][nome_luogo] = nome;
                    ArrayTime[c+n][categoria] = Array_Cat[file_choice];
                    ArrayTime[c+n][auto] = string_min_in_auto;
                    ArrayTime[c+n][piedi] = string_min_a_piedi;
                    ArrayTime[c+n][url_anteprima_immagine] = urlimmagine;


                }

                n = n+nodi.getLength();


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


        }

        //Arrays.sort(ArrayTime, new ColumnComparator(0));




        //Stampa dell'array sulla lista - - -

        /*
        for(int i = 0; i<6; i++)
        {   
            ip = new InterestPoint();
            ip.nome = "pippo"+i;
            ip.categoria ="cat pippo"+i;
            ip.apiedi = "25";
            ip.inauto = "10";
            listaInteressPoint.add(ip);
        }
        */



        final LocationManager manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE );


        if (gps_on == 1) {

            listaInteressPoint = new ArrayList<InterestPoint>();

            for(int i = 0; i<n;i++)
            {
                ip = new InterestPoint();
                ip.nome = ArrayTime[i][nome_luogo];
                ip.categoria = "Categoria: "+ArrayTime[i][categoria];
                ip.inauto = "In auto: " +ArrayTime[i][auto]+ " minuti";
                ip.apiedi = "A piedi: " +ArrayTime[i][piedi]+ " minuti";
                listaInteressPoint.add(ip);
            }

            //Ordinamento
            Collections.sort(listaInteressPoint, new Comparator<InterestPoint>(){

                @Override
                public int compare(InterestPoint elem1, InterestPoint elem2) {

                    return elem1.inauto.compareTo(elem2.inauto);
                }

            });


        }else
        {

            listaInteressPointNOGPS = new ArrayList<InterestPoint>();

            for(int i = 0; i<n;i++)
            {
                ip = new InterestPoint();
                ip.nome = ArrayTime[i][nome_luogo];
                ip.categoria = "Categoria: "+ArrayTime[i][categoria];
                ip.inauto = "In auto:   Attiva la posizione per la distanza";
                ip.apiedi = "A piedi:   in auto e a piedi";
                listaInteressPointNOGPS.add(ip);
            }

            //Ordinamento
            Collections.sort(listaInteressPointNOGPS, new Comparator<InterestPoint>(){

                @Override
                public int compare(InterestPoint elem1, InterestPoint elem2) {

                    return elem1.nome.compareTo(elem2.nome);
                }

            });
        }


        //ListView Item Click Listener
        lista.setOnItemClickListener(new OnItemClickListener() {


            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                    if (gps_on == 1){
                        //listaInteressPoint = new ArrayList<InterestPoint>(); 
                        //ListView Clicked item index
                        int itemPosition = position;

                        InterestPoint item = adapter.getItem(position);

                        Intent piu_info = new Intent(thiz, MoreInfoActivity.class); 
                        piu_info.putExtra("nome", item.nome);
                        startActivity(piu_info);
                        //ListView clicked item value
                        //int itemValue = (int) lista.getItemAtPosition(position);

                        //Show Alert
                        //Toast.makeText(getApplicationContext(), "Position :"+itemPosition+" ListItem :"+ item.nome, Toast.LENGTH_LONG).show();
                    }else
                    {
                        //ListView Clicked item index
                        //listaInteressPointNOGPS = new ArrayList<InterestPoint>();
                        int itemPosition = position;

                        InterestPoint item = adapterNOGPS.getItem(position);

                        Intent piu_info = new Intent(thiz, MoreInfoActivity.class); 
                        piu_info.putExtra("nome", item.nome);
                        startActivity(piu_info);
                        //ListView clicked item value
                        //int itemValue = (int) lista.getItemAtPosition(position);

                        //Show Alert
                        //Toast.makeText(getApplicationContext(), "Position :"+itemPosition+" ListItem :"+ item.nome, Toast.LENGTH_LONG).show();
                    }


            }
        });

    }

    @Override
        protected void onResume() {
            super.onResume();

            //final LocationManager manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE );
            adapter = new CustomListAdapter(getApplicationContext(), R.layout.list_item, listaInteressPoint);
            adapterNOGPS = new CustomListAdapter(getApplicationContext(), R.layout.list_item, listaInteressPointNOGPS);

            if (gps_on == 1 ) {

                lista.setAdapter(adapter);
            }else
            {
                listaNOGPS.setAdapter(adapterNOGPS);
            }
        }

    public String GetURLperLista(String nome){
        String url_luogo="";

        for (int i = 0; i<ArrayTime.length; i++)
        {
            if (nome.equals(ArrayTime[i][nome_luogo]))
            {
                url_luogo = ArrayTime[i][url_anteprima_immagine];
            }
        }

        return url_luogo;
    }
}

CustomListAdapter.java:

package com.example.findmyclients;

import com.example.findmyclients.AppController;
import com.example.findmyclients.Movie;
import com.squareup.picasso.Picasso;

import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;

public class CustomListAdapter extends ArrayAdapter<InterestPoint> {


    private Context context;
    private int textViewResourceId;
    private LayoutInflater inflater;
    private List<InterestPoint> listaPunti;

    public CustomListAdapter(Context context, int textViewResourceId,
            List<InterestPoint> objects) {
        super(context, textViewResourceId, objects);
        this.context = context;
        this.textViewResourceId = textViewResourceId;
        this.listaPunti = objects;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        ViewHolder holder; // to reference the child views for later actions


        if (v == null) {
            LayoutInflater vi = 
                (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(textViewResourceId, null);
            // cache view fields into the holder
            holder = new ViewHolder();
            holder.nomeView = (TextView) v.findViewById(R.id.label_titolo);
            holder.categoriaView = (TextView) v.findViewById(R.id.label_categoria);
            holder.inautoView = (TextView) v.findViewById(R.id.label_in_auto);
            holder.apiediView = (TextView) v.findViewById(R.id.label_a_piedi);
            holder.immagine = (ImageView) v.findViewById(R.id.immagine_luogo);

            // associate the holder with the view for later lookup
            v.setTag(holder);
        }
        else {
            // view already exists, get the holder instance from the view
            holder = (ViewHolder) v.getTag();
        }
        // no local variables with findViewById here

        InterestPoint item = getItem(position);
        holder.nomeView.setText(item.nome);
        holder.categoriaView.setText(item.categoria);
        holder.inautoView.setText(item.inauto);
        holder.apiediView.setText(item.apiedi);

        ListviewActivity lvA = new ListviewActivity();
        String url = lvA.GetURLperLista(item.nome);

        try{
            Picasso.with(context).load(url).into(holder.immagine);
        }catch(Exception e)
        {
            e.printStackTrace();
        }

        return v;

        // use holder.nameText where you were 
        // using the local variable nameText before
    }

    // somewhere else in your class definition
    static class ViewHolder {
        TextView nomeView;
        TextView categoriaView;
        TextView inautoView;
        TextView apiediView;
        ImageView immagine;
    }

}