Is there any way to detect if fragment is showing to user or not?

Question

Here are simple steps.

step1 : fragment1 was showing and it's already added to Backstack
step2 : fragment2 is added to Backstack and showing it now
step3 : fragment2 is removed from Backstack

So finally, fragment1 is showing again to user. In this situation, is there anyway to detect if fragment1 is showing again inner fragment1?

I tried with OnResume() but it doesn't work.

Thanks for answers!

score 1 · Answer 1 · answered May 16 '17 at 08:24

1

Fragment currentFragment = getFragmentManager().findFragmentById(R.id.fragment_container);

if (currentFragment instanceof YourFragment) {

if(currentFragment.this.isVisible())
{
  //your code
}
}

answered May 16 '17 at 08:24

sasikumar

12,540
3
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Where does I need to add your code? Please read again my question. I want to detect it in fragment that is showing now. – Passionate.C May 16 '17 at 08:26
1

@Passionate.C I believe he has answered your question. Your code goes in the second if statement. i.e current.this.isVisible() – stebak May 16 '17 at 08:39
I want to add the code to fragment1 to detect it. it's possible? – Passionate.C May 16 '17 at 08:47
@Passionate.C Hope my answer can help. – jignesh.world May 16 '17 at 08:51

score 1 · Answer 2 · edited May 23 '17 at 12:34

When you add the fragment in your transaction you should use a tag.

fragTrans.replace(android.R.id.content, myFragment, "MY_FRAGMENT");

...and later if you want to check if the fragment is visible:

MyFragment myFragment = (MyFragment)getFragmentManager().findFragmentByTag("MY_FRAGMENT");
if (myFragment != null && myFragment.isVisible()) {
   // add your code here
}

See also http://developer.android.com/reference/android/app/Fragment.html

I just copied this answer https://stackoverflow.com/a/9295085/7232310 because I think is what you need. Otherwise you can check the following answers on the same question.

Hope it helps!

yes. it helps but it needs to add code to Activity or something that manages the fragments. i want to detect in fragment1. — Passionate.C, May 16 '17 at 08:47

score 0 · Answer 3 · 2017-05-16T08:35:37.537

Try onAttach(), this is to trigger if the fragment is showed. onDetach() is to detect if the fragment is leaving the user interface.

For example: you have 3 fragment(frag1,frag2,frag3), every fragment you need to put the onAttach()

frag1 
@Override
    public void onAttach(Context context) {
        super.onAttach(context);
        Toast.makeText(context, "I'm frag 1", Toast.LENGTH_SHORT).show();
    }

jignesh.world · Answer 4 · 2017-05-16T08:56:42.430

0

I think there are 2 options

Try to override this behaviour and see if it works

void onHiddenChanged (boolean hidden)

As per documented here

Or Other option is to onStart() / onResume() callback of lifecycle try to observe behaviour of fragments visibility state.

boolean isVisible ()

As per documented here

edited May 16 '17 at 08:56

answered May 16 '17 at 08:50

jignesh.world

1,396
1
11
26

If you can drop code snippets will help us to play on that and fix issue. – jignesh.world May 16 '17 at 09:21

Is there any way to detect if fragment is showing to user or not?

4 Answers4