How to connect Virtual Android with PostGreSQL on Local Machine?

Good morning,

I'm trying to create a connection of Android Virtual created in% with% with% with%. As my knowledge in Eclipse ADT I spent very little time trying to connect and did not have success.

public String conectarDB() throws ExecutionException {

    // Variáveis
    try {
        String driver = "com.postgresql.Driver";
        String url = "jdbc:postgresql://127.0.0.1:5432/database";
        String user = "postgres";
        String pass = "#Servicedesk#@!1";

     // Conectar
        try {
            Class.forName(driver);
            Connection con = null;
            con = (Connection) DriverManager.getConnection(url, user, pass);
            return ("Conexão: Funcionando!");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            return ("Erro com Database!");
        } catch (SQLException e) {
            e.printStackTrace();
            return ("Erro com JDBC!");
        }

    } catch(Exception e) {
        e.printStackTrace();
        return ("Conexão: Erro no envio de Conexão!");
    }

}