Callback For Viewpager Transition To Next Pane?

Is there any way for me to invoke a callback when the user swipes from one pane to the next? As far as my experimentation has revealed, the present (primary) pane/fragment as well

Solution 1:

You can attach an OnPageChangeListener to your ViewPager to get updates on when the user swipes to a new page:

viewPager.setOnPageChangeListener(new OnPageChangeListener() {

    @Override
    public void onPageScrollStateChanged(int state) 
    {

    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) 
    {

    }

    @Override
    public void onPageSelected(int position) 
    {                       
        Log.d("MainActivity", "New position = " + position);    
    }
});

And if you use a FragmentPagerAdapter, your ViewPager's pages will be cached in memory. If you use a FragmentStatePagerAdapter, they will not be cached.

Solution 2:

the Fragment's setUserVisibleHint() would be callback as long as a fragment was completely disappeared or appeared, hide or show the MediaController operation can be done here.

publicclassYourFragment extend android.support.v4.app.Fragment {
    ...
    @OverridepublicvoidsetUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser) {
            System.out.println("VISIBLE");
        } else {
            System.out.println("GONE");
        }
    }
    ...
}