android - onOptionsItemSelected called twice -

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running android 5.0 on nexus 5. app uses v4 support library 21.0.0. minsdkversion 11 , targetsdkversion 21.

i have activity deriving android.support.v4.app.fragmentactivity. have number of menu items on action bar. now, if double-tap 1 of action bar's menu items, onoptionsitemselected called twice resulting in 2 instances of menu-triggered child ctivity! , yes, menu handlers return true.

i have googled this, couldn't find anything. facing bug, or have missed something? i've implemented in past, , never encountered weird behavior. ideas?

not sure why happens in latest support lib, in past, views, i've used solution - 

private long mlastclicktime = 0;  protected boolean isnotafastclick() {      boolean result = true;      if (systemclock.elapsedrealtime() - mlastclicktime < fast_click_threshold) {           result = false;      }      mlastclicktime = systemclock.elapsedrealtime();      return result; }

before handling click events, call method check if fast click.


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