First define a SparseArray in your ViewPagers’ adapters like below. In this array we’ll hold the instance of fragments.
SparseArray<Fragment> registeredFragments = new SparseArray<>();
And Override your Adapters’ instantiateItem method.
@Override
public Object instantiateItem(ViewGroup container, int position) {
Fragment fragment = (Fragment) super.instantiateItem(container, position);
registeredFragments.put(position, fragment);
return fragment;
}
Also Override destroyItem method of your ViewPagers
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
registeredFragments.remove(position);
super.destroyItem(container, position, object);
}
And define a new method to get your ViewPager Fragments instance.
public Fragment getRegisteredFragment(int position) {
return registeredFragments.get(position);
}
And finally set add a PageChangeListener to your ViewPagers:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// Here's your instance
YourFragment fragment =(YourFragment)yourPagerAdapter.getRegisteredFragment(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
Or
int position = viewPager.getCurrentItem(); YourFragment fragment =(YourFragment)yourPagerAdapter.getRegisteredFragment(position);
References
https://stackoverflow.com/questions/39143087/how-to-get-the-current-fragment-displayed-in-a-specific-tab-of-a-viewpager
https://stackoverflow.com/questions/8258759/getting-the-current-position-of-a-viewpager