ProgressDialog shown behind another dialog

My custom dialog has a list which takes long time to obtain. So I load it in a separate thread launched in onPrepareDialog using AsyncTask. Prior to calling AsyncTask.execute I invoke ProgressDialog. The problem is that when my dialog is called for the first time (onCreateDialog is invoked), ProgressDialog is shown behind my (empty) dialog. How can I show ProgressDialog in hr front? When my dialog is dismissed and shown again, the display order is correct.

public class MyActivity extends Activity {
FileSelectDlg fileSelectDlg = null;
LayoutInflater inflater;
ArrayList<String> fileList;


@Override
public void onCreate(Bundle savedInstanceState) {

    inflater = LayoutInflater.from(this);
}
@Override
protected Dialog onCreateDialog( int id ) 
{
    fileSelectDlg = new FileSelectDlg( this );
    return fileSelectDlg;
}
@Override
    protected synchronized void onPrepareDialog( int id, Dialog dialog ) {
    fileSelectDlg.update_dlg_view( -1 );
}

public class FileSelectDlg extends Dialog {
    private Context                 context;
    private BaseAdapter             adapter;

    public FileSelectDlg( Context context ) {
        super(context);
        this.context = context;

        View content = inflater.inflate( R.layout.file_select, null );
        setContentView( content );

        adapter = new BaseAdapter() {
            @Override
            public int getCount() {
                if( fileList != null )
                    return fileList.size();
                return 0;
            }
            @Override
            public Object getItem(int position) {
                return position;
            }
            @Override
            public long getItemId(int position) {
                return position;
            }
            @Override
            public View getView( int position, View convertView, ViewGroup parent ) {
                TextView textView;
                if (convertView == null) {
                    convertView = inflater.inflate(R.layout.file_select_item, null);
                    textView = (TextView) convertView.findViewById(R.id.item_text);
                    convertView.setTag(textView);
                } else {
                    textView = (TextView)convertView.getTag();
     开发者_如何学Python           }
                if( fileList != null ) {
                    textView.setText( fileList.get( position ) );
                }
                return convertView;
            }
        };

        ListView listView = (ListView)findViewById( R.id.list );
        listView.setAdapter(adapter);
        listView.setOnItemClickListener( new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int clicked, long id ) {
                update_dlg_view( clicked );
            }
        });
    }
    public void update_dlg_view( int clicked ) {
        int option = option_get_list;
        String item = null;
        if( clicked >= 0 ) {
            item = fileList.get( clicked );
            fileSelector.setDir(item);
        }

        final ProgressDialog progressDialog = new ProgressDialog( context );
        progressDialog.setMessage( "wait..." );
        progressDialog.setCancelable(false);
        progressDialog.show();

        new AsyncTask<Integer, Integer, Long>() {
            protected Long doInBackground( Integer... _option ) {
                long option = _option[0];
                fileList = fileSelector.getList();
                return option;
            }
            @Override
            protected void onPostExecute( Long option ) {
                progressDialog.dismiss();
                FileSelectDlg.this.setTitle( fileSelector.getCurrentPath() );
                adapter.notifyDataSetChanged();
            }
        }.execute(option);
    }
}

try calling the AsyncTask.execute inside onCreateDialog for Custom Dialogue.

Perhaps try moving the ProgressDialog into the AsyncTask and using onPreExecute() to create and display it. This would keep the ProgressDialog more tied to its operation, and may provide the delay you need for display order.

    new AsyncTask<Integer, Integer, Long>() {
        ProgressDialog progressDialog;

        @Override
        protected void onPreExecute() {
            progressDialog = new ProgressDialog( context );
            progressDialog.setMessage( "wait..." );
            progressDialog.setCancelable(false);
            progressDialog.show();
        }

        @Override
        protected Long doInBackground( Integer... _option ) {
            long option = _option[0];
            fileList = fileSelector.getList();
            return option;
        }

        @Override
        protected void onPostExecute( Long option ) {
            progressDialog.dismiss();
            FileSelectDlg.this.setTitle( fileSelector.getCurrentPath() );
            adapter.notifyDataSetChanged();
        }
    }.execute(option);

You wouldn't have to declare it as final then, either :)