Inform when view is displaying in FragmentStatePagerAdapter Android

I'm trying to create slideshow something like Instagram stories.
I write some code and everything is working fine. I'm using Handler.postDelay
to change the slide. I want to prevent changing slide when slide is video type it stop thread until video is loaded after loading video it start again handler thread. Check code for better understanding.

Handler.postDelay

Here is my code.

private class StorySlidePagerAdapter extends FragmentStatePagerAdapter {
public StorySlidePagerAdapter(FragmentManager fm) {
super(fm);
Log.i("StoryActivityDebug", "StorySlidePagerAdapter constructor");
}

@Override
public Fragment getItem(int position) {
Log.i("StorySlideDebug", "getItem position " + position);
StorySlide storySlide = StorySlide.create(position);
storySlide.setOnStoryLoad(StoryActivity.this);
return storySlide;
}


@Override
public int getCount() {
return NUM_STORIES;
}
}


Here is how I change slide.

updateStory = new Runnable() {
@Override
public void run() {

if (killThread)
return;

mPager.setCurrentItem(mPager.getCurrentItem() + 1);
}
};
handler.postDelayed(updateStory, slideChangingTime);


Here is StorySlide

public class StorySlide extends Fragment {
// other code

@Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {

// other code
// storySlides is list of object contain info about story
if( storySlides.getType == VIDEO )
slideInterface.onKillThread(true); // it will stop the thread

}

@Override
public void onVideoPrepare(){ slideInterface.startThread() }

}


When storyslide type is video it stop the updateStory thread to change next slide and wait until video is prepared after video prepration it start again changing slides. It's working fine but problemm is in FragmentStatePagerAdapter

updateStory

FragmentStatePagerAdapter

FragmentStatePagerAdapter create at least one or two fragments already maybe for better performance. If you are on the first slide it already created the next slide for you but show only when you set mPager.setCurrentItem(itemNumber)
You can check it by seeing Logs.
This behaviour is creating problem for me. For example if first slide is image and second one is video. It create both simultaneously because when slide is video it prevent thread to change slide until video load. Due to this first slide is not changed until until video is not load in second slide.
I want first slide change and second slide wait until video is load.

FragmentStatePagerAdapter

fragments

mPager.setCurrentItem(itemNumber)

Please let me know where I'm making problem.

Update

All the problem is with the behaviuor of FragmentStatePagerAdapter. It creates view before displaying. And there is no override method that inform view is displaying or not. How can I make a such method myself. Or stop FragmentStatePagerAdapter to create view before displaying ? Is there any way ?

FragmentStatePagerAdapter

FragmentStatePagerAdapter

Here's the answer you are looking for.
– azizbekian
Jun 29 at 10:28

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