Android TaskStackBuilder ugly transition -

what on earth wrong taskstackbuilder uses ugly transition when starting new activities.:

    taskstackbuilder taskstackbuilder = taskstackbuilder.create(this)             .addparentstack(activityb.class)             .addnextintent(new intent(this, activityb.class));     taskstackbuilder.startactivities(); 

this standard code google if run code see super ugly transition when going activityb.

i guess because new task. dont want there can ?

thanks !