Wait for a thread before continue on Android

Question

I've one thread, but i'd like to wait for it to finish before continue with the next actions. How could i do it?

            new Thread(

                    new Runnable() {

                        @Override
                        public void run() {
                            mensaje = getFilesFromUrl(value);
                        }

                    }).start();

here i'd like to put something (but loops) that knows when thread finishes and evaluate the result (mensaje)

            btnOk.setVisibility(View.VISIBLE);
            progressBar.setVisibility(View.GONE);
            lblEstado.setText(mensaje);

            if(mensaje.equals("Importado"))
                startActivity(new Intent(ScanUrl.this, MainActivity.class));

Answer 1

Thread t = new Thread(new Runnable() {                         @Override                         public void run() {                             mensaje = getFilesFromUrl(value);                         }});  t.start(); // spawn thread  t.join();  // wait for thread to finish