android中的ViewPager到ViewPager2

Question

I am migration Viewpager to Viewpager2 and im facing 2 problems as of now,

1. how to show left and right items using Viewpager2 using Cardview(view horizontally)?
2. pressing back, i have Viewpager2 last selected count saved that is index and in "on resume" im calling below code.

issue 2 using below code: mBinding.viewPager.setCurrentItem(index, true);

and its always going to index 0 if index choosed is 3 etc.

for issue 1 im using below code and im able to see left and right items on scroll also code :

viewPager.setClipToPadding(false);
viewPager.setClipChildren(false);
viewPager.setOffscreenPageLimit(1);

Do let me know whether its correct using viewpager2. Issue 2 still a problem, can any one help resolving both 1 ,2 issue in Viewpager2?

current code:

@Override
    public void onResume() {
        super.onResume();
        Log.e(TAG, "onResume");
        mBinding.viewPager.setCurrentItem(index, true);
    }

    @Override
    public void onPause() {
        super.onPause();
        Log.e(TAG, "onPause");
        index = mBinding.viewPager.getCurrentItem();
    }

 mBinding.viewPager.setClipToPadding(false);
        mBinding.viewPager.setClipChildren(false);
        mBinding.viewPager.setOffscreenPageLimit(1);

 SlideAdapter = new SlideAdapter(this, List, Fragment.this);
        mBinding.viewPager.setAdapter(SlideAdapter);

        mBinding.viewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                super.onPageScrolled(position, positionOffset, positionOffsetPixels);
            }

            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);
                Log.d(TAG, "onPageSelected:" + position);
                
            }

            @Override
            public void onPageScrollStateChanged(int state) {
                super.onPageScrollStateChanged(state);
            }
        });

Any help is appreciated!

Answer 1

Use this line to show items horizontal

viewPager2.orientation = ViewPager2.ORIENTATION_HORIZONTAL

and Don't forget to unregister the OnPageChangeCallback

viewPager2.unregisterOnPageChangeCallback(viewPager2PageChangeCallback)