ProgressDialog in AsyncTask

Question

I m trying to display a custom progressdialog while loading RSS feed from an HTTP server  I made a hard search  but nothing helped me to do this  the only thing I know is that the solution should use AsyncTask  but I m confusing about the params to pass to this AsyncTask  Here s my activity    public class Soirees extends ListActivity        private List lt Message gt  messages      private TextView tvSorties      private MyProgressDialog dialog        Override     public void onCreate Bundle icicle             super onCreate icicle           setContentView R layout sorties            tvSorties  TextView findViewById R id TVTitle           tvSorties setText  Programme des soir  es             loadFeed                private void loadFeed             try              BaseFeedParser parser   new BaseFeedParser                messages   parser parse                List lt Message gt  titles   new ArrayList lt Message gt  messages size                 for  Message msg   messages                   titles add msg                             MessageListAdapter adapter   new MessageListAdapter this titles               this setListAdapter adapter               adapter notifyDataSetChanged               catch  Throwable t               Log e  ImageLoader  t getMessage   t                        Can you please help me add AsyncTask to this

User · Answer

AsyncTask is very helpful   class QueryBibleDetail extends AsyncTask lt Integer  Integer  String gt           private Activity activity          private ProgressDialog dialog          private Context context           public QueryBibleDetail Activity activity               this activity   activity              this context   activity              this dialog   new ProgressDialog activity               this dialog setTitle                      this dialog setMessage         tome chapterID     sectionFromID  -  sectionToID               if  this dialog isShowing                     this dialog show                                      Override         protected String doInBackground Integer    params                Log d TAG    doInBackground                publishProgress params 0                 if sectionFromID  gt  sectionToID                   return                                String queryBible    action query bible amp article   chapterID   amp id   tomeID   amp verse start   sectionFromID   amp verse stop   sectionToID                 try                  String bible    Json getRequest HOST queryBible   trim                    bible   android text Html fromHtml bible  toString                    return bible               catch Exception e                   e printStackTrace                              return null                      Override         protected void onPostExecute String bible               Log d TAG    onPostExecute                TextView bibleBox    TextView  findViewById R id bibleBox               bibleBox setText bible               this dialog dismiss

User · Answer

A couple of days ago I found a very nice solution of this problem  Read about it here  In two words Mike created a AsyncTaskManager that mediates ProgressDialog and AsyncTask  It s very easy to use this solution  You just need to include in your project several interfaces and several classes and in your activity write some simple code and nest your new AsyncTask from BaseTask  I also advice you to read comments because there are some useful tips

User · Answer

Don t know what parameter should I use   A lot of Developers including have hard time at the beginning writing an AsyncTask because of the ambiguity of the parameters  The big reason is we try to memorize the parameters used in the AsyncTask  The key is Don t memorize  If you can visualize what your task really needs to do then writing the AsyncTask with the correct signature would be a piece of cake            What is an AsyncTask   AsyncTask are background task which run in the background thread  It takes an Input  performs Progress and gives Output      ie  AsyncTask lt Input Progress Output gt    Just figure out what your Input  Progress and Output are and you will be good to go   For example       How does doInbackground   changes with AsyncTask parameters         How doInBackground   and onPostExecute   onProgressUpdate   are    related             How can You write this in a code    DownloadTask extends AsyncTask lt String Integer String gt         Override     public void onPreExecute                Override     public String doInbackGround String    params                    Download code          int downloadPerc      calculate that          publish downloadPerc             return  Download Success               Override     public void onPostExecute String result                 super onPostExecute result               Override     public void onProgressUpdate Integer    params                    show in spinner  access UI elements            How will you run this Task in Your Activity   new DownLoadTask   execute  Paradise mp3

User · Answer

This question is already answered and most of the answers here are correct but they don t solve one major issue with config changes  Have a look at this article https   androidresearch wordpress com 2013 05 10 dealing-with-asynctask-and-screen-orientation  if you would like to write a async task in a better way

User · Answer

Fixed by moving the view modifiers to onPostExecute so the fixed code is    public class Soirees extends ListActivity       private List lt Message gt  messages      private TextView tvSorties         private MyProgressDialog dialog       Override     public void onCreate Bundle icicle             super onCreate icicle            setContentView R layout sorties            tvSorties  TextView findViewById R id TVTitle           tvSorties setText  Programme des soir  es             new ProgressTask Soirees this  execute                 private class ProgressTask extends AsyncTask lt String  Void  Boolean gt            private ProgressDialog dialog          List lt Message gt  titles          private ListActivity activity            private List lt Message gt  messages          public ProgressTask ListActivity activity                this activity   activity              context   activity              dialog   new ProgressDialog context                            progress dialog to show user that the backup is processing                  application context             private Context context           protected void onPreExecute                 this dialog setMessage  Progress start                this dialog show                            Override         protected void onPostExecute final Boolean success                    List lt Message gt  titles   new ArrayList lt Message gt  messages size                     for  Message msg   messages                       titles add msg                                     MessageListAdapter adapter   new MessageListAdapter activity  titles                   activity setListAdapter adapter                   adapter notifyDataSetChanged                     if  dialog isShowing                      dialog dismiss                               if  success                    Toast makeText context   OK   Toast LENGTH LONG  show                  else                   Toast makeText context   Error   Toast LENGTH LONG  show                                     protected Boolean doInBackground final String    args                try                      BaseFeedParser parser   new BaseFeedParser                    messages   parser parse                      return true                 catch  Exception e                   Log e  tag    error   e                   return false                                           Vladimir  thx your code was very helpful

User · Answer

this class performs all the work  shows dialog before the work and dismiss it after     public class ProgressTask extends AsyncTask lt String  Void  Boolean gt         public ProgressTask ListActivity activity            this activity   activity          dialog   new ProgressDialog activity                  progress dialog to show user that the backup is processing         private ProgressDialog dialog          application context         private ListActivity activity       protected void onPreExecute             this dialog setMessage  Progress start            this dialog show                    Override     protected void onPostExecute final Boolean success            if  dialog isShowing                  dialog dismiss                        MessageListAdapter adapter   new MessageListAdapter activity  titles           setListAdapter adapter           adapter notifyDataSetChanged              if  success                Toast makeText context   OK   Toast LENGTH LONG  show              else               Toast makeText context   Error   Toast LENGTH LONG  show                         protected Boolean doInBackground final String    args           try                BaseFeedParser parser   new BaseFeedParser              messages   parser parse              List lt Message gt  titles   new ArrayList lt Message gt  messages size               for  Message msg   messages                 titles add msg                         activity setMessages titles             return true           catch  Exception e            Log e  tag    error   e             return false                    public class Soirees extends ListActivity       private List lt Message gt  messages      private TextView tvSorties      private MyProgressDialog dialog       Override     public void onCreate Bundle icicle             super onCreate icicle            setContentView R layout sorties            tvSorties  TextView findViewById R id TVTitle           tvSorties setText  Programme des soir  es                just call here the task         AsyncTask task   new ProgressTask this  execute             public void setMessages List lt Message gt  msgs          messages   msgs

User · Answer

It s been a few years since this question was asked  and since someone has posted a response   Since then  ProgressDialog was deprecated in API level O  according to Android s official documentation  As such  you might consider using an inline progress bar instead of a ProgressDialog as the documentation authors suggest

[android] ProgressDialog in AsyncTask

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