Android: layout animation like Inshorts news app

Question

swipe up and down effect like those news apps inshorts,hike news,murmur.

whole layout smoothly up/down.
check app on this link inshorts and murmur.

i tried this code...

    public class VerticalViewPager extends ViewPager {
    public VerticalViewPager(Context context) {
        super(context);
        init();
    }

    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    private void init() {
        // The majority of the magic happens here
        setPageTransformer(true, new VerticalPageTransformer());
        // The easiest way to get rid of the overscroll drawing that happens on the left and right
        setOverScrollMode(OVER_SCROLL_NEVER);
    }
    private class VerticalPageTransformer implements PageTransformer {

        @SuppressLint("NewApi")
        @Override
        public void transformPage(View view, float position) {

            if (position < -1) { // [-Infinity,-1)
                // This page is way off-screen to the left.
                view.setAlpha(0);

            } else if (position <= 1) { // [-1,1]
                view.setAlpha(1);

                // Counteract the default slide transition
                view.setTranslationX(view.getWidth() * -position);

                //set Y position to swipe in from top
                float yPosition = position * view.getHeight();
                view.setTranslationY(yPosition);

            } else { // (1,+Infinity]
                // This page is way off-screen to the right.
                view.setAlpha(0);
            }
        }
    }

    /**
     * Swaps the X and Y coordinates of your touch event.
     */
    private MotionEvent swapXY(MotionEvent ev) {
        float width = getWidth();
        float height = getHeight();

        float newX = (ev.getY() / height) * width;
        float newY = (ev.getX() / width) * height;

        ev.setLocation(newX, newY);

        return ev;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev){
        boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
        swapXY(ev); // return touch coordinates to original reference frame for any child views
        return intercepted;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return super.onTouchEvent(swapXY(ev));
    }

}

In MainActivity.java

VerticalViewPager Pager2;
PagerAdapter adapter;
String[] articleTitle;
String[] articleName;
String[] articleDiscription;

OnCreate()

Pager2=(VerticalViewPager)findViewById(R.id.pager);


// Pass results to ViewPagerAdapter Class
adapter = new ViewPagerAdapter(getActivity(), articleTitle, articleName,     articleDiscription, btnBack,articleImage);

// Binds the Adapter to the ViewPager
Pager2.setAdapter(adapter);

activity_main.xml

<com.example.flipnews.VerticalViewPager
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/pager"
   />

In my code simple up-down swipe done,like this link. but i want to create better animation effect like above mentioned apps. or phone inbuilt photo gallery effect.

Thanks in advance.

Answer 1

I found solution after many research i hope its helpful for others.

Tip: set view pager background color black for better swipe effect.

 private static class VerticalPageTransformer implements PageTransformer {
        private static float MIN_SCALE = 0.75f;

        public void transformPage(View view, float position) {
            int pageWidth = view.getWidth();

            if (position < -1) { // [-Infinity,-1)
                // This page is way off-screen to the left.
                view.setAlpha(0);



            } else if (position <= 0) { // [-1,0]
                // Use the default slide transition when moving to the left page
                view.setAlpha(1);
                //view.setTranslationX(1);
                view.setScaleX(1);
                view.setScaleY(1);
                float yPosition = position * view.getHeight();
                view.setTranslationY(yPosition);
                view.setTranslationX(-1 * view.getWidth() * position);

            } else if (position <= 1) { // (0,1]
                // Fade the page out.
                view.setAlpha(1 - position);

                view.setTranslationX(-1 * view.getWidth() * position);

                // Scale the page down (between MIN_SCALE and 1)
               float scaleFactor = MIN_SCALE
                        + (1 - MIN_SCALE) * (1 - Math.abs(position));
                view.setScaleX(scaleFactor);
                view.setScaleY(scaleFactor);

            } else { // (1,+Infinity]
                // This page is way off-screen to the right.
                view.setAlpha(0);
            }

        }
    }

    private MotionEvent swapXY(MotionEvent ev) {
        float width = getWidth();
        float height = getHeight();

        float newX = (ev.getY() / height) * width;
        float newY = (ev.getX() / width) * height;

        ev.setLocation(newX, newY);

        return ev;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev){
        boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
        swapXY(ev); // return touch coordinates to original reference frame for any child views
        return intercepted;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return super.onTouchEvent(swapXY(ev));
    }

}