Gesture in listview android

hi i have to add a gesture to my listview,i want to implement the same functionality of contact application. when i left swipe it should send a message,right swipe it should call. can anyone help me how to do those gesture detection... i have implemented it in various other views... but i couldn't do for listView... i don't what going worng... my code is`

/** Called when the activity is first created. */
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    // Create an array of Strings, that will be put to our ListActivity
    String[] names = new String[] { "Linux", "Windows7", "Eclipse", "Suse", "Ubuntu", "Solaris", "Android", "iPhone"};
    // Create an ArrayAdapter, that will actually make the Strings above
    // appear in the ListView
    this.setListAdapter(new ArrayAdapter<String>(this, R.id.MyList, names));
    gestureListener = new ListView.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if (gestureDetector.onTouchEvent(event)) {
                return true;
            }
            return false;
        }
    };      
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    // Get the item that was clicked
    Object o = this.getListAdapter().getItem(position);
    String keyword = o.toString();
    Toast.makeText(this, "You selected: " + keyword, Toast.LENGTH_LONG).show();
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (gestureDetector.onTouchEvent(event))
        return true;
    else
        return false;
}

class MyGestureDetector extends SimpleOnGestureListener {

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
                return false;
                // right to left swipe
            }
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Context ctx = getApplicationContext();
                CharSequence txt = "Right to Left Swipe";
                int duration = Toast.LENGTH_LONG;
                Toast toast = Toast.makeText(ctx, txt, duration);
                toast.show();
                Toast.makeText(this.getItem(lv.pointToPosition((int)e1.getX(),(int) e1.getY())));
                // return super.onFling();                                          
            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Context ctx = getApplicationContext();
                CharSequence txt = "Left to Right Swipe";
                int duration = Toast.LENGTH_LONG;
                Toast toast = Toast.makeText(ctx, txt, duration);
                toast.show();
            }
        } catch (Exception e) {
            // nothing
        }
        return false;
    }
}