how to call a method in onCreateView only if the Fragment is displayed in screen?

Question

I'm using viewPager to create a layout with tabs and in each tab I use a Fragment. One of them is to get all de user contacts and put it on a ListView. But I want to call de AssyncTask only if the Fragment is displayed on screen.

is there a method to do it? TY

Check your fragment's visibility http://stackoverflow.com/questions/10024739/how-to-determine-when-fragment-becomes-visible-in-viewpager — since k saji, Apr 18 '16 at 18:45

score 2 · Answer 1 · answered Apr 18 '16 at 18:43

Start your AsyncTask in onStart which is the method called once the fragment becomes visible to the user. onCreateView will be called even if the fragment doesn't become visible. See also: http://developer.android.com/reference/android/app/Fragment.html#onStart()

I would however recommend to use a loader instead of AsyncTask (e.g. an AsyncTaskLoader http://developer.android.com/reference/android/content/AsyncTaskLoader.html).

score 1 · Accepted Answer · edited Apr 19 '16 at 00:55

1

you can use

@Override
public void setUserVisibleHint(boolean isVisibleToUser)
{
    super.setUserVisibleHint(isVisibleToUser);
    if(isVisibleToUser)
    {
       //things to do when fragment is visible
    }
}

Even it is called before onCreateView.

edited Apr 19 '16 at 00:55

Shree Krishna

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answered Apr 18 '16 at 18:53

Dharmaraj

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score 0 · Answer 3 · answered Apr 18 '16 at 18:44

You can check to see if it's visible with .isVisible() something like this

MyFragmentClass fragment = (MyFragmentClass) getSupportFragmentManager().findFragmentByTag("fragmentTAG");

if (fragment != null && fragment.isVisible()) {
     // call AsyncTask
}

how to call a method in onCreateView only if the Fragment is displayed in screen?

3 Answers3