Update the current fragment in FragmentPagerAdapter

android, android-viewpager, fragmentpageradapter

Solution

You simply use:

mViewPager.setOnPageChangeListener(new OnPageChangeListener() {

            @Override
            public void onPageSelected(int index) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                // TODO Auto-generated method stub

            }
        })

Then you can handle what happens in `onPageSelected(int index)`.

Problem

I have a viewPager with tab indicator. The ViewPager is setAdaper with a FragmentPagerAdapter. I have little understanding how the internals of FragmentPagerAdapter work. I noticed that the neighbor fragments are resumed ( OnResume is called ) , even though the neighbor are not yet visible. I put the update methods in OnResume thinking that once the fragment is current, it will be updated. Ad banner refresh I want the ad banner set in the footer to update when swiping to the left once or swipping once to the right . The neighbor fragments are not recreated ( good thing ). But onResume is already called avoiding the banner refresh. The method loadBannerAd is in OnResume() method. How can I call the method loadBannerAd() only for the current fragment by a method inside the fragment ? EDIT : I already know about mViewPager.setOnPageChangeListener() . ``` OnPageChangeListener mOnPageChangeListener = new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int position) { // this method can be called before the fragment 's onCreateView() } .... }; ``` But there is a danger when the fragment has not been created yet . Managing whether the fragment has been created or not in the Activty defeats the purepose of it.

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