question: private void translateHeader ( float of ) { float ofCalculated = of * mScrollMultiplier ; if ( Build . VERSION . SDK_INT >= Build . VERSION_CODES . HONEYCOMB && of < mHeaderView . getHeight ( ) ) { mHeaderView . setTranslationY ( ofCalculated ) ; } else if ( of < mHeaderView . getHeight ( ) ) { TranslateAnimation anim = new TranslateAnimation ( 0 , 0 , ofCalculated , ofCalculated ) ; anim . setFillAfter ( true ) ; anim . setDuration ( 0 ) ; mHeaderView . startAnimation ( anim ) ; } mHeaderView . setClipY ( Math . round ( ofCalculated ) ) ; if ( mParallaxScrollListener != null ) { final RecyclerView . ViewHolder holder = mRecyclerView . findViewHolderForAdapterPosition ( 0 ) ; float left ; if ( holder != null ) { left = Math . min ( 1 , ( ( ofCalculated ) / ( mHeaderView . getHeight ( ) * mScrollMultiplier ) ) ) ; } else { left = 1 ; } mParallaxScrollListener . onParallaxScroll ( left , of , mHeaderView ) ; } }
target:  Translates the adapter in Y