Get The Result From Async Task

I want to get my result from an Async task. If I use task.execute.get, my UI will be frozen. I want my Async task will be stand alone class so I don't want to put my result process

Solution 1:

1-I don't know when to process the result?

The result will be processed in onPostExecute, which in turn will call your interface method in whatever class is implementing this interface. So the actual UI stuff will all take place in your Activity or Fragment or whatever is implementing the interface callback. You can pass any data you want to it.

2-why to use interface?

An interface is a great way to decouple the logic from your AsyncTask and whatever class (I assume an Activity or Fragment) that is implementing it. Also this means that any class that implements this interface can process results from this AsyncTask, it become easily re-usable.

3-What's the differences of using an interface with simply putting the result in a public field in Async task from onPostExecute?

You still won't get a callback - how will your Activity or Fragment know when this field is populated and ready to be interrogated?

Solution 2:

For your concern with basics ..

Step (1) Initiate Async Task

new BussinessOwnerHttpAsyncTask().execute();

Step (2) Create your AsyncTask class like this

classBussinessOwnerHttpAsyncTaskextendsAsyncTask<String, Void, String> {

        @OverrideprotectedvoidonPreExecute() {
            // TODO Auto-generated method stubsuper.onPreExecute();
// Here U perform all your basics task like start showing progress bar as mentioned below.  //@Android Hacker // On OnPostExecute method U stop your progress dialog after all data has been fetched // @Android Hacker 
            pDialog = newProgressDialog(getParent());
            pDialog.setMessage("Please wait ...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        @Overrideprotected String doInBackground(String... params) {


// Here U fetch all data from server @Android Hacker //  Maintaining Shared preferences class for further...SharedPreferencessp= getSharedPreferences("search_data", 0);
            SharedPreferences.Editoreditor= sp.edit();
            editor.putString("service_name", service_name);
            editor.putString("city_name", city_name);
            editor.putString("loc", city_name + ", " + country_name);
            editor.putString("country_name", country_name);
            editor.putString("pMonth", (checkDigit(pMonth + 1)));
            editor.putString("day", day);
            editor.putString("year", year);
            editor.putString("d", year + "-" + checkDigit(pMonth + 1) + "-" + day);
            editor.commit();

            HttpClienthttpclient=newDefaultHttpClient();
            Stringloc="";
            Stringsdate="";

            try{

                if(pDisplayDate.getText().toString().equalsIgnoreCase("")){
                    sdate = year + "-" + checkDigit(pMonth + 1) + "-" + day;
                }else{
                    sdate = date;
                }
            }catch(Exception e){
                e.printStackTrace();
            }

            if(etlocation.getText().toString().length() == 0){
                city_name = "";
                country_name = "Kuwait";
                loc = "" + ", " + "Kuwait";
            }else{
                loc = city_name + ", " + country_name;
            }


            StringmyUrl= service_name + "~" + city_name + "~"
                    + country_name + "~" + date
                    + "~" + service_recog_id;

            if(city_name.equalsIgnoreCase("")){
                locations = "Kuwait"; 
            }else{
                locations = city_name + ", " + country_name;
            }

            SharedPreferencesm= getSharedPreferences("modify", 0);
            SharedPreferences.Editoreee= m.edit();
            eee.putString("service", service_name);
            eee.putInt("service_recog_id", service_recog_id);
            eee.putString("location", loc);
            eee.putString("date", sdate);
            eee.putString("locations", locations);
            eee.commit();


            StringencodedURL="";
            try {
                encodedURL = URLEncoder.encode(myUrl, "UTF-8");
            } catch (UnsupportedEncodingException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            try {
                URLurl=newURL(encodedURL);
                Log.d("asca", ""+url);
            } catch (MalformedURLException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

            Log.i("url", city_name + "~" + country_name);
            Log.d("location", request_url+encodedURL);
            HttpGethttpget=newHttpGet(request_url+encodedURL);

            try {
                httpresponse = httpclient.execute(httpget);
                System.out.println("httpresponse" + httpresponse);
                Log.i("response", "Response" + httpresponse);
                InputStreamis= httpresponse.getEntity().getContent();
                InputStreamReaderisr=newInputStreamReader(is);
                BufferedReaderbr=newBufferedReader(isr);
                StringBuildersb=newStringBuilder();

                StringrecievingDataFromServer=null;
                while ((recievingDataFromServer = br.readLine()) != null) {
                    Log.i("CHECK WHILE", "CHECK WHILE");
                    sb.append(recievingDataFromServer);
                }

                myJsonString = sb.toString();
                Log.d("manish", myJsonString);
                serverSearchData = sb.toString();
            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            return sb.toString();
        }

        @OverrideprotectedvoidonPostExecute(String result) {
            // TODO Auto-generated method stubsuper.onPostExecute(result);
            pDialog.dismiss();

 // @Android Hacker .. Here U perform all your task for UI . Here U get data and set that //data to UI 


        }

    }

Hope it clears all your doubts..