android - Display ProgressBar while waiting for operation to complete -


in mvvmcross app have android progressbar defined as:

<progressbar     android:id="@+id/progressbar"     style="?android:attr/progressbarstylelarge"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:progressdrawable="@drawable/circular_progress_bar"     android:gravity="right"     local:mvxbind="visibility visibility(isbusy)" />

in viewmodel, code executed when clicking button start operation like:

public void next() {     isbusy = true;      try     {         //the expensive operation         var response = calltimeconsumingservice();          if (response.methodfailed)         {             _dialogservice.displayalert(this, response.message);             return;         }          showviewmodel<shownextview>();     }     catch (exception ex)     {         _dialogservice.displayalert(this, ex.message);     }      isbusy = false; }

but progressbar not displayed unless remove last isbusy = false;, means displayed when next() method hass exited (not while waiting)

what can display progressbar while waiting , disable before navigating next page?

===edit====

ended doing this:

public void next() {    async () =>        {            isbusy = true;            await dowork();            isbusy = false;        }); }

adding rest of code dowork await task

//the expensive operation var response = await calltimeconsumingservicereturningtask();

this happening because process of updating ui happening in same thread expensive operation. until operation completed, ui thread blocked , visual feedback never shown properly. solve this, need make calltimeconsumingservice() async call (making return task<t>) , await complete.

if have network calls in method, blocking methods have async counterparts awaitable already. if method involves heavy processing, should use taskcompletionsource or task.run.


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