在TimerTask中创建进度对话框

Question

我需要在这个类上创建一个Progress对话框。我试图让它显示，而所有方法都完成了。可能吗 ？也许更有经验的人遇到过这个问题？是否可以在此类中执行此操作，或者我需要在从其他活动调用此方法时执行此操作？：

public class Data_synch extends TimerTask {
    private Context mContext;
    String FormsString;
    DatabaseDataHandler db;
    static String realLink;
    String url = "/android/sync";
    User user;
    ProgressDialog pd;
    protected static final int DIALOG_OK= 0;
    ProgressDialog timeBar;
    public Data_synch(String realLin, Context context, User user) {
        mContext = context;
        this.user = user;
        // realLink = ((Link_holder)
        // mContext.getApplicationContext()).getLink();
        realLink = realLin;
        url = realLink + url;
        // pd = ProgressDialog.show(mContext, "", "Uploading photos", false);
    }

    @Override
    public void run() {
        new HttpAsyncTask().execute(url);


        // /* sync from sever */
        new SyncFromServer(realLink, true, false, false, false,false, user, mContext);
        new SyncFromServer(realLink, false, true, false, false,false, user, mContext);
        new SyncFromServer(realLink, false, false, true, false, false,user, mContext);
        new SyncFromServer(realLink, false, false, false, true, false,user, mContext);
        new SyncFromServer(realLink, false, false, false, false, true,user, mContext);
                try {

                    new SyncPhotos(realLink, user, mContext);

                } catch (final Exception e) {
                    System.out.println("SAKIU RAJONAS");
                    e.printStackTrace();
                }

    }

    public String POST(String x) {
        InputStream inputStream = null;
        String result = "";

        try {
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(5);
            // System.out.println("x == " + x);
            nameValuePairs
                    .add(new BasicNameValuePair("email", user.getEmail()));
            nameValuePairs.add(new BasicNameValuePair("password", user
                    .getPassword()));
            nameValuePairs.add(new BasicNameValuePair("prefix", user
                    .getPrefix()));

            nameValuePairs.add(new BasicNameValuePair("sync_data", x));
            // System.out.println(nameValuePairs);
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));

            HttpResponse httpResponse = httpclient.execute(httpPost);
            int statusCode = httpResponse.getStatusLine().getStatusCode();
            inputStream = httpResponse.getEntity().getContent();
            if (inputStream != null) {
                result = convertInputStreamToString(inputStream);
            } else
                result = "Did not work!";
        } catch (Exception e) {
            Log.d("InputStream", "FAIL");
        }

        return result;
    }

    public static String convertInputStreamToString(InputStream inputStream)
            throws IOException {
        BufferedReader bufferedReader = new BufferedReader(
                new InputStreamReader(inputStream));
        String line = "";
        String result = "";
        while ((line = bufferedReader.readLine()) != null)
            result += line;
        // System.out.println("result is " + result);
        inputStream.close();
        return result;

    }

    public class HttpAsyncTask extends AsyncTask<String, Void, String> {
        JSONObject json;
        final String is_synch = "1";
        String synch;
        String damn;
        JSONArray JsonObjectsArray = new JSONArray();

        public String getdamn() {
            return damn;
        }

        protected String doInBackground(String... urls) {

            String log = "nothing";
            db = new DatabaseDataHandler(mContext);

            List<Data> datas = db.getAllData();
            int nr_of_data = 0;
            for (Data cn : datas) {
                log = cn.getJson();
                // synch = cn.getSynch();
                // System.out.println(synch);
                // if(synch = "0")
                // System.out.println(synch);
                // if(synch == "0"){
                // cn.setSynch("1");
                try {
                    json = new JSONObject(log);
                    add_JsonObject_to_JSONArray(createJsonObjectString(json, cn));
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                nr_of_data++;

            }

            db.close();

            System.out
                    .println("WAWAWYWAWAWAWYWAWAWAWYWAWAWAWYWAWAWAWYWAWAWAWYWA");
            damn = JsonObjectsArray.toString();
            return POST(damn);

        }

        // private JSONArray PostJsonArray(JSONArray x){
        // JsonObjectsArray = ;
        //
        // return x;
        // }
        //

        // onPostExecute displays the results of the AsyncTask.
        @Override
        protected void onPostExecute(String result) {
            System.out.println(result);
        }

        private JSONArray add_JsonObject_to_JSONArray(JSONObject jsonobject) {

            JsonObjectsArray.put(jsonobject);

            return JsonObjectsArray;
        }

        private JSONObject createJsonObjectString(JSONObject jsonobject, Data cn)
                throws JSONException {
            String comment = "";
            jsonobject.put("comment", comment);
            // System.out.println("xxxx : "+ jsonobject);

            return jsonobject;
        }
    }

}