How to combine BottomNavigationView and ViewPager?

As the answer of Mr. @Chintan , I replaced :

return new FooFragment();

to

viewPager.setCurrentItem(index);

And remove loadFragment() function, it's perfectly works now. Thank you very much!

Change this code in MainActivity

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {

    switch (menuItem.getItemId()) {
        case R.id.menu_home:
            viewPager.setCurrentItem(0);
            break;
        case R.id.menu_favorite:
            viewPager.setCurrentItem(1);
            break;
        case R.id.menu_account:
            viewPager.setCurrentItem(2);
            break;
    }
    return true;
}

Add this code for select bottomNavigation Tab.

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                switch (position) {
                    case 0:
                        mBottomNavigation.getMenu().findItem(R.id.menu_home).setChecked(true);
                        break;
                    case 1:
                        mBottomNavigation.getMenu().findItem(R.id.menu_favorite).setChecked(true);
                        break;
                    case 2:
                        mBottomNavigation.getMenu().findItem(R.id.menu_account).setChecked(true);
                        break;
                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });