AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle(R.string.contacto).setIcon(R.drawable.rudeboys_icon);
builder.setMessage("hola");
builder.show(); } while(timer_dialog<10);

@Override
        public void onTick(long millisUntilFinished) {
            crono.setText("" + String.format(FORMAT, TimeUnit.MILLISECONDS.toHours(millisUntilFinished),
                    TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millisUntilFinished)),
                    TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));


        }
        @Override
        public void onFinish() { //finalizar dialog } }

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle(R.string.contacto).setIcon(R.drawable.rudeboys_icon);
builder.setMessage("hola");
final AlertDialog mDialog = builder.create();
// para hacerlo modal
mDialog.setCanceledOnTouchOutside(false);
mDialog.show();

new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            if(null != mDialog && mDialog.isShowing()) mDialog.dismiss();
        }
    }, 10000);

new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                if(builder != null && builder.isShowing()) builder.dismiss();
            }
        }, 10000);

new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {

            //Llama método deseado.

            }
        }, 10000);

AlertDialog.Builder dialog = new AlertDialog.Builder(getActivity());
    dialog.setCancelable(false);
    dialog.setTitle("Dialog & Handler");
    dialog.setMessage("Este dialogo se cerrara en 10 segundos!");
    dialog.setPositiveButton("OK!!!", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int id) {
            //No action.
        }
    })
            .setNegativeButton("Cancel ", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                //No action.
                }
            });

    final AlertDialog alert = dialog.create();
    alert.show();  //Muestra dialogo.

    //Crea handler, em 10 segundos cierra el dialogo.
    new Handler().postDelayed(new Runnable(){
        public void run(){
            if (alert.isShowing()) {
                alert.dismiss();
            }
        }
    }, 10000); //10 segundos después llama alert.dismiss();

do {
  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  builder.setTitle(R.string.contacto).setIcon(R.drawable.rudeboys_icon);
  builder.setMessage("hola");
  builder.show();
} while(timer_dialog<10);

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  builder.setTitle(R.string.contacto).setIcon(R.drawable.rudeboys_icon);
  builder.setMessage("hola");
  builder.setCancelable(false); // <--- Esta linea agregue.
  builder.show();