delphi - How to show and hide a virtual keyboard (android) -

with delphi (berlin) method show , hide virtual keyboard under android ?

i put on form native android edit. set setshowsoftinputonfocus(false); , try open manually keyboard like

  var avirtualkeyboardservice: ifmxvirtualkeyboardservice;   tplatformservices.current.supportsplatformservice(ifmxvirtualkeyboardservice, iinterface(avirtualkeyboardservice));   if (avirtualkeyboardservice <> nil) avirtualkeyboardservice.showvirtualkeyboard(self); 

but it's not work :( sometime keyboard show, sometime not :(

take @ ifmxvirtualkeyboardservice. has showvirtualkeyboard , hidevirtualkeyboard methods.