Viewpager with Fragments - Onpause(), Onresume()

Fragment's are not calling OnResume() when swiping with ViewPager

Use setUserVisibleHint(boolean isVisibleToUser).

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser) {
       // Do your stuff here
    }

}

Fragment onResume() & onPause() is not called on backstack

The fragments onResume() or onPause() will be called only when the Activities onResume() or onPause() is called.
They are tightly coupled to the Activity.

Read the Handling the Fragment Lifecycle section of this article.

ViewPager calls onPause() onResume()

By default, the viewPager only keep in memory one fragment in each side.. is like this:

mViewPager.setOffscreenPageLimit(1);

You can increase that number, but be careful, you can easily run out of memory..

Resume all fragments at once in viewpager/viewpager2 on calling onResume() method

call setOffscreenPageLimit with a number higher than half your fragments. This will force the viewpager to create and keep all of the fragments created as you have in your adapter.

viewPager.setOffscreenPageLimit(2);
viewPager.setAdapter(pagerAdapter);

Here I assumed 2 as the total number of fragments in viewpager

OnResume() not called in Fragment using tabLayout and ViewPager

I've solved the problem.
I use setUserVisibleHint(boolean isVisibileToUser) instead onResume(). Like this:

 @Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if(isVisibleToUser) {
        init();
    } else {

    }
}

Thank you all!

How to determine when Fragment becomes visible in ViewPager

How to determine when Fragment becomes visible in ViewPager

You can do the following by overriding setUserVisibleHint in your Fragment:

public class MyFragment extends Fragment {
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser) {
        }
        else {
        }
    }
}

How to do some code when fragments in a ViewPager appear and disappear

I solved my problem this way:

  @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {

        if(phrase != null){
            if(isVisibleToUser){
                Log.i(TAG, "setUserVisibleHint" + phrase.getPhrase()+ "|isVisibleToUser " + isVisibleToUser);
            }else {
                Log.i(TAG, "setUserVisibleHint" + phrase.getPhrase()+ "|isVisibleToUser " + isVisibleToUser);
            }
        }
}

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