java - Android call notifyDataSetChanged from AsyncTask -

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i've custom listadapter fetches data internet in asynctask.

the data added list, when try operations application crashes...

i'm sure because i'm calling notifydatasetchanged(); @ wrong time (i.e. before asynctask ends).

what i've got now:

public class mylistadapter extends baseadapter {     private arraylist<string> mstrings = new arraylist<string>();      public mylistadapter() {         new retreivestringstask().execute(internet_url);         //here call notify function ****************         this.notifydatasetchanged();     }      class retreivestringstask extends asynctask<string, void, arraylist<string>> {         private exception exception;          @override         protected arraylist<string> doinbackground(string... urls) {             try {                 url url= new url(urls[0]);                 //return arraylist                 return getstringsfrominternet(url);;             } catch (exception e) {                 this.exception = e;                 log.e("asynctask", exception.tostring());                 return null;             }         }          @override         protected void onpostexecute(arraylist<string> stringsarray) {             //add tours internet array             if(stringsarray != null) {                 mstrings.addall(toursarray);             }         }     } }

my question is: can call notifydatasetchanged() onpostexecute function in asynctask or @ other time when asynctask has fetched data?

can call notifydatasetchanged() onpostexecute function in asynctask

yes, can call notifydatasetchanged() onpostexecute update adapter data when doinbackground execution complete. as: 

@override protected void onpostexecute(arraylist<string> stringsarray) {     //add tours internet array     if(stringsarray != null) {         mstrings.addall(toursarray);         // call notifydatasetchanged() here...          mylistadapter.this.notifydatasetchanged();     } }

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