Crossfade effect in Android ViewPager

ViewPager Crossfade

// Credit goes to http://fiskur.eu/?p=752

public class CrossfadePageTransformer implements ViewPager.PageTransformer {
 
        @Override
        public void transformPage(View page, float position) {
            int pageWidth = page.getWidth();
 
            View backgroundView = page.findViewById(R.id.background);
            View text = page.findViewById(R.id.content);
 
            View phone = page.findViewById(R.id.phone);
            View map = page.findViewById(R.id.map);
            View mountain = page.findViewById(R.id.mountain);
            View mountainNight = page.findViewById(R.id.mountain_night);
            View rain = page.findViewById(R.id.rain);
            View hands = page.findViewById(R.id.screenshot);
 
            if (position <= 1) {
                page.setTranslationX(pageWidth * -position);
            }
 
            if(position <= -1.0f || position >= 1.0f) {
            } else if( position == 0.0f ) {
            } else {
                if(backgroundView != null) {
                    backgroundView.setAlpha(1.0f - Math.abs(position));
                }
 
                //Text both translates in/out and fades in/out
                if (text != null) {
                    text.setTranslationX(pageWidth * position);
                    text.setAlpha(1.0f - Math.abs(position));
                }
 
                //Map + phone - map simple translate, phone parallax effect
                if(map != null){
                    map.setTranslationX(pageWidth * position);
                }
 
                if(phone != null){
                    phone.setTranslationX((float)(pageWidth/1.2 * position));
                }
 
                //Mountain day - fade in/out
                if(mountain != null){
                    mountain.setAlpha(1.0f - Math.abs(position));
                }
 
                //Mountain night - fade in, but translate out, rain fades in but parallax translate out
                if(mountainNight != null){
                    if(position < 0){
                        mountainNight.setTranslationX(pageWidth * position);
                    }else{
                        mountainNight.setAlpha(1.0f - Math.abs(position));
                    }
                }
 
                if(rain != null){
                    if(position < 0){
                        rain.setTranslationX((float)(pageWidth/1.2 * position));
                    }else{
                        rain.setAlpha(1.0f - Math.abs(position));
                    }
                }
 
                //Long click device + hands - translate both way but only fade out
                if(hands != null){
                    hands.setTranslationX(pageWidth * position);
                    if(position < 0) {
                        hands.setAlpha(1.0f - Math.abs(position));
                    }
                }
            }
        }
    }