android - AlertDialog not showing while cancelling AsyncTask -
i have got little problem while cancellling asynctask, in a fragment processes data. if internet session expired asynctask should cancelled , dialog shown inform user.
however if cancel asynctask alertdialog not shown, noticed oncancelled()is not being called onpostexecute()is still executed.
if pls assist?
edit: if use while method, alertdialog shown how cancel asynctask code of tryin doinbackground() still being executed?
while (!iscancelled()) { // stuff } edit 2: solved! seemed asynctask call not correctly instinciated, below code works , oncancelled method called , onpostexecute declined should be. cudos anudeep bulla point me in right direction.
public class tb3_abonnement extends fragment { private asynctask<void, void, void> task; ... @override // if fragment visible user, start asynctask public void setuservisiblehint(boolean isvisibletouser) { super.setuservisiblehint(isvisibletouser); if (isvisibletouser) { // execute asynctask startfetch(); } } // wrap (asynctask call) in own method public void startfetch() { task = new fetchfacturen(); task.execute(); } private class fetchfacturen extends asynctask<void, void, void> { // create new alertdialog alertdialog taskdialog = new alertdialog.builder(getactivity()) .setcancelable(false) .settitle("mededeling facturen:") .setmessage("uw sessie verlopen! u dient zich weer opnieuw in te loggen. ") .setpositivebutton(android.r.string.yes, new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int which) { // start loginactivity intent mainintent = new intent(getactivity(), loginactivity.class); getactivity().startactivity(mainintent); getactivity().finish(); } }) .seticon(android.r.drawable.ic_dialog_info) .create(); @override protected void onpreexecute() { if (helper.minutes <= 0) { task.cancel(true); } else { showprogress(true); } } @override protected void doinbackground(void... result) { charsequence cs1 = "€"; if (iscancelled()) { util.disconnect(); return null; } try { // heavy stuff } } } catch (ioexception e) { e.printstacktrace(); } return null; } @override protected void oncancelled() { // correctly called if(iscancelled()){ log.e("cancelled", "tab3"); this.taskdialog.show(); } super.oncancelled(); } @override protected void onpostexecute(void result) { // skipped if(iscancelled()){ this.taskdialog.show(); } else { setupinvoiceadapter(); showprogress(false); } } } here important code parts:
public class tb3_abonnement extends fragment { private fetchabbo task; ... @override // if fragment visible user, start asynctask public void setuservisiblehint(boolean isvisibletouser) { super.setuservisiblehint(isvisibletouser); if (isvisibletouser) { // execute asynctask task = new fetchabbo(); task.execute(); } public class fetchabbo extends asynctask<void, void, void> { @override protected void onpreexecute() { if (helper.minutes <= 0) { task.cancel(true); // cancel asynctask new alertdialog.builder(getactivity()) // create new alertdialog .setcancelable(false) .settitle("mededeling:") .setmessage("uw sessie verlopen! u dient zich weer opnieuw in te loggen. ") .setpositivebutton(android.r.string.yes, new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int which) { // start loginactivity } }) .seticon(android.r.drawable.ic_dialog_info) .show(); } } @override protected void doinbackground(void... result) { if (!this.iscancelled()) { // executed log.e("fetchabbo: ", "cancelled!"); // printed util.disconnect(); return null; } try { log.e("fetchabbo: ", "still running!"); // heavy stuff } } catch (ioexception e) { e.printstacktrace(); } return null; } @override protected void oncancelled() { log.e("cancelled", "tab3"); // not printed, oncancelled() not called? super.oncancelled(); } @override protected void onpostexecute(void result) { setuptxtviews(); mscrollview.setvisibility(view.visible); // set scrollview visible } }
i may wrong, don't seem understand logic of showing dialog in onpreexecute everytime. why not try ?
public class fetchabbo extends asynctask<void, void, void> { alertdialog taskdialog = new alertdialog.builder(getactivity()) // create new alertdialog .setcancelable(false) .settitle("mededeling:") .setmessage("uw sessie verlopen! u dient zich weer opnieuw in te loggen. ") .setpositivebutton(android.r.string.yes, new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int which) { // start loginactivity } }) .seticon(android.r.drawable.ic_dialog_info) .create(); @override protected void onpreexecute() { if (helper.minutes <= 0) { task.cancel(true); // cancel asynctask } } @override protected void doinbackground(void... result) { if (!this.iscancelled()) { // executed log.e("fetchabbo: ", "cancelled!"); // printed util.disconnect(); return null; } try { log.e("fetchabbo: ", "still running!"); // heavy stuff } } catch (ioexception e) { e.printstacktrace(); } return null; } @override protected void oncancelled() { log.e("cancelled", "tab3"); // not printed, oncancelled() not called? if(this.iscancelled()){ this.taskdialog.show(); } super.oncancelled(); } @override protected void onpostexecute(void result) { if(this.iscancelled()){ this.taskdialog.show(); } else { setuptxtviews(); mscrollview.setvisibility(view.visible); // set scrollview visible } } } 
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