onListItemClick on Activity extends ListActivity

I try a listview but when I click on an element I have not my toast

public class MarkersListActivity extends ListActivity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        String[] titles = new String[] {"Titre 1", "Titre 2", "Titre 3", "Titre 4"};        String[] des = new String[] {"des 1", "des 2", "des 3", "des 4"};        setListAdapter( new MarkerListArrayAdapter(this, titles, des));}    @Override    protected void onListItemClick(ListView l, View v, int position, long id) {    //get selected items    String selectedValue = (String) getListAdapter().getItem(position);    Toast.makeText(this, selectedValue, Toast.LENGTH_SHORT).show();    }}

MarkerListArrayAdapter

public class MarkerListArrayAdapter extends ArrayAdapter<String> {private final Context context;private final String[] titleText;private final String[] descriptionText;public MarkerListArrayAdapter(Context context, String[] titles, String[] description) {    super(context, R.layout.marker_list_layout, titles);    this.context = context;    this.titleText = titles;    this.descriptionText = description;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {    LayoutInflater inflater = (LayoutInflater) context        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);    View rowView = inflater.inflate(R.layout.marker_list_layout, parent, false);    TextView title = (TextView) rowView.findViewById(R.id.title);    TextView description = (TextView) rowView.findViewById(R.id.description);    ImageView imageView = (ImageView) rowView.findViewById(R.id.image);    title.setText(titleText[position]);    description.setText(descriptionText[position]);    imageView.setBackgroundColor(Color.argb(255,255,0,0));    return rowView;}}

The xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content"android:padding="5dp"><ImageView    android:id="@+id/image"    android:layout_width="50dp"    android:layout_height="50dp"    android:layout_marginLeft="5dp"    android:layout_marginRight="20dp"    android:layout_marginTop="5dp"    android:src="@drawable/transparent"></ImageView><LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical"><TextView        android:id="@+id/title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@+id/label"        android:textSize="30sp"></TextView><TextView        android:id="@+id/description"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@+id/label"        android:textSize="15sp" /></LinearLayout></LinearLayout>

Thanks