question: public boolean hideCard ( String tag ) { final Card card = mVisibleCards . get ( tag ) ; if ( card != null ) { mVisibleCards . remove ( tag ) ; mDismissibleCards . remove ( tag ) ; mHiddenCards . put ( tag , card ) ; mLayout . removeView ( card . getView ( ) ) ; return true ; } return mHiddenCards . containsValue ( tag ) ; }
target:  Hides the card, returns false if the card could not be hidden.