Android animation not working on ProgressBar -


i trying use animations in android project try doesnt work line using animate progress bar. 

progressbar progressbar = (progressbar)convertview.findviewbyid(r.id.pb_loading);           progressbar.startanimation(animationutils.loadanimation(getsherlockactivity().getapplicationcontext(),android.r.anim.fade_out));

this xml. 

  <progressbar         android:id="@+id/pb_loading"         android:layout_height="64dp"         android:layout_width="64dp"         android:indeterminate="true"         android:indeterminatedrawable="@drawable/spinner"         android:indeterminateduration="2000"         android:indeterminateonly="true"         android:layout_centerinparent="true" />


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