How to get the value of a particular listview item java android

As I get the value of a certain item (TextView) from the listview.

I'm trying something like this:

public void onItemClick(AdapterView<?> a, View v, int position, long id) {

Object obj =a.getItemAtPosition(position);

String mensagem = "Cliente Selecionado: " + obj;

Toast.makeText(getApplicationContext(), mensagem, Toast.LENGTH_SHORT)
        .show();}

but returns the selected client and this is not what I need. I remember in my listview there are several TextView