Send and receive Mysql data with Android

Question

What is it, quiet? I have an Activity that is listing a number of products from a Mysql database. I need you to, when clicking on any of these products, transfer me to another Activity, take the product ID together and, for this collected ID, do a search in Mysql and return me the details of that product. I’m managing to pass the ID to second Activity, I just can’t get this ID, play in php, do the search in Mysql and return the results JSON pro android.

At first Activity I’m managing to pass the ID:

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

    String pid = ((TextView) view.findViewById(R.id.pid)).getText().toString();

    Intent in = new Intent(getApplicationContext(), DetalhesLivro.class);

    in.putExtra("pid", pid);

    startActivity(in);
 }

On Monday, I recover:

EditText txtID;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detalhes_livro);


    Intent i = getIntent();

    pid = i.getStringExtra("pid");

    //Teste para ver se está pegando o ID
    //Jogando o ID num EditText
    txtID = (EditText) findViewById(R.id.inputID);
    txtID.setText(pid);
}

My problem is from now on. I need to play this ID in php and return me the results.