Google Android - это несложно

При вызове приложения появляется AlertDialog. Когда закрываю его он появляется еще раз. Во второй раз он закрывается. В чем ошибка?
[syntax=java]public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
private ListView list;
private String[] st;
private Button bt;
private ProgressBar pr;
String title;
Intent intent;

public DummySectionFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.fragment_main_dummy,
container, false);
//list = (ListView) rootView.findViewById(R.id.listView1);
st = getResources().getStringArray(R.array.punkts);

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this.getActivity(),
R.layout.fragment_list_item, st);
//list.setAdapter(adapter);

intent = this.getActivity().getIntent();

bt = (Button) rootView.findViewById(R.id.button1);
pr = (ProgressBar) rootView.findViewById(R.id.progressBar1);
pr.setMax(100);

bt.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new DownloadFileFromURL().execute("");
}
});
if (intent.getAction().equals("android.intent.action.VIEW")){
View view = LayoutInflater.from(this.getActivity()).inflate(R.layout.ask, null);
EditText editText = (EditText) view.findViewById(R.id.editText1);
Uri uri = intent.getData();
editText.setText(uri.getLastPathSegment());
AlertDialog.Builder builder = new AlertDialog.Builder(this.getActivity());
builder.setTitle(R.string.sett);
builder.setView(view);
builder.setCancelable(false);
builder.setPositiveButton(R.string.down, new DialogInterface.OnClickListener(){

@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
return rootView;
}[/syntax]