android - Adding View to Window Manager And Activity animation -

i have added button inside window. want open activity animating left when user taps on button.

problem: first time when change activity , taps sliding animation dont works second time while on screen works fine.

here code.

 if (basketflagview == null)         {             windowmanager = (windowmanager) activity.getapplicationcontext().getsystemservice(service.window_service);             basketflagview = new basketflagview(activity);             windowmanager.layoutparams params = getbuttonparams(activity);             windowmanager.addview(basketflagview, params);         }