android - onPostExecute is not called in AsyncTask<Void, Void, Boolean> with abstract class -


i working google calendar api , stuck asynctask. onpostexecute cannot called if use abstract class.

makerequesttask.java

import android.app.progressdialog; import android.os.asynctask; import android.util.log;  import com.google.api.client.googleapis.extensions.android.gms.auth.googleplayservicesavailabilityioexception; import com.google.api.client.googleapis.extensions.android.gms.auth.userrecoverableauthioexception;  import java.io.ioexception; import java.util.list;  abstract class makerequesttask extends asynctask<void, void, boolean> { private string tag = "makerequesttask";  final mainactivity mainactivity; final com.google.api.services.calendar.calendar mservice; private exception mlasterror = null;  progressdialog loading = null;  //calendar service; makerequesttask(mainactivity mainactivity) {     this.mainactivity = mainactivity;     this.mservice = mainactivity.mservice;      loading = new progressdialog(mainactivity);     loading.setcancelable(true);     loading.setmessage("sync google calendar";     loading.setprogressstyle(progressdialog.style_spinner);  }  @override protected void onpreexecute() {     super.onpreexecute();     log.i(tag, "onpreexecute");     mainactivity.numasynctasks++;     loading.show(); }   @override protected final boolean doinbackground(void... ignored) {     log.i(tag, "doinbackground");     try {         doinbackground();         return true;     } catch (final googleplayservicesavailabilityioexception availabilityexception) {         mainactivity.showgoogleplayservicesavailabilityerrordialog(                 availabilityexception.getconnectionstatuscode());     } catch (userrecoverableauthioexception userrecoverableexception) {         mainactivity.startactivityforresult(                 userrecoverableexception.getintent(), mainactivity.request_authorization);     } catch (ioexception e) {         //utils.logandshow(activity, mainactivity.tag, e);         log.i(tag, "ioexception" + e);     }     return false; }  @override protected final void onpostexecute(boolean success) {     super.onpostexecute(success);     log.i(tag, "onpostexecute");     loading.cancel();     if (0 == --mainactivity.numasynctasks) {     }     if (success) {     } }   abstract protected void doinbackground() throws ioexception;  }

asyncloadevent.java (one of abstract class)

import android.content.sharedpreferences; import android.preference.preferencemanager; import android.util.log;  import com.google.api.client.util.datetime; import com.google.api.services.calendar.model.event; import com.google.api.services.calendar.model.events;  import java.io.ioexception; import java.util.arraylist; import java.util.list;  class asyncloadevent extends makerequesttask { private string tag = "asyncloadevent";  asyncloadevent(mainactivity mainactivity) {     super(mainactivity);     this.mainactivity = mainactivity; }  @override protected void doinbackground() throws ioexception {     log.i(tag, "doinbackground");     try {         ......     } catch (exception e) {         log.i(tag, "exception" + e);         cancel(true);     } } }

as can see question, if not use abstract class , change asynctask java follows, onpostexecute called. 

... @override protected final boolean doinbackground(void... ignored) {     log.i(tag, "doinbackground");     return true; } ...

i appreciate if point out mistake in code, duplicate solution nice, long providing clear explanation or guide.

if want more code in abstract class, so.

ok, have found issue after work around. related abstract class.

asyncloadevent.java (one of abstract class)

@override protected void doinbackground() throws ioexception {     log.i(tag, "doinbackground");     try {         getdatafromapi();     } catch (exception e) {         log.i(tag, "exception : " + e);         cancel(true);         log.i(tag, "cancel(true)");     } }

the class jumped exception , run "cancel(true)" because tried update ui components in "getdatafromapi()", , wouldn't call onpostexecute().

i seeked override method in asynctask class , found oncancelled() available. , saw thread says:

calling method result in oncancelled(object) being invoked on ui thread after doinbackground(object[]) returns. calling method guarantees onpostexecute(object) never invoked. after invoking method, should check value returned iscancelled() periodically doinbackground(object[]) finish task possible.


Comments

Post a Comment

Popular posts from this blog

inversion of control - Autofac named registration constructor injection -

does autofac support specifying registration name in components' constructors? example: ninject's namedattribute . you need use autofac.extras.attributed package on top achieve this so let's have 1 interface , 2 classes: public interface ihello { string sayhello(); } public class englishhello : ihello { public string sayhello() { return "hello"; } } public class frenchhello : ihello { public string sayhello() { return "bonjour"; } } then have consumer class, in want select instance injected: public class helloconsumer { private readonly ihello helloservice; public helloconsumer([withkey("en")] ihello helloservice) { if (helloservice == null) { throw new argumentnullexception("helloservice"); } this.helloservice = helloservice; } public string sayhello() { return this.helloservice.sayhello()...
Read more

verilog - Systemverilog dynamic casting issues -

i've code snippet following in testbench function void write_to_port( my_data_type_base data ); my_data_type_extended data_ext; if(!$cast(data_ext, data)); `uvm_error(get_type_name(), "failed cast"); `uvm_info(get_name(), $psprintf("data_ext :\n%s", data_ext.sprint()), uvm_medium) // write data_ext out port.... endfunction when run it, i'm getting uvm_error "failed cast." i'm not quire sure why $cast not returning 1. can see, i'm printing out extended class data item after casting uvm_info. can see it's being cast properly. if don't use $cast if condition, don't runtime error. isn't coding practice use if dynamic cast check if $cast returning 1 ? what might reason behind cast not returning 1 in above case? i think semicolon on line 'if' not belong? i think consumes if statement, , uvm_error executes regardless of how if evaluates: if(!$cast(data_ext, data)); <- no semico...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more