How to access parent Activity View in Fragment

Question

I have an ActionBarActivity and fragment. I am using FragmentPagerAdapter that provides fragment to my app. My question How can I access parent Activity View in Fragment ??

score 188 · Accepted Answer · answered Apr 05 '14 at 16:31

188

You can use

View view = getActivity().findViewById(R.id.viewid);

Quoting docs

Specifically, the fragment can access the Activity instance with getActivity() and easily perform tasks such as find a view in the activity layout

answered Apr 05 '14 at 16:31

Raghunandan

132,755
26
225
256

Works, but I would use an interface to communicate with the activity or something like that. – DeliriumTremens Apr 05 '14 at 18:25
1

your welcome to use the interface way also. But that is for communicating with activity – Raghunandan Apr 05 '14 at 18:26
6

Yep who knows what the state is going to be, hacky I know but I have lunch to eat. – Kevin Parker Feb 25 '15 at 16:24
1

Cool, just you would need to check if Fragment is added by isAdded() to avoid crash if activity is not attached yet. – Maher Abuthraa May 14 '17 at 18:34
@Raghunandan. Doesn't work if I rotate the device. That time the view becomes null and i get a NPE – zulkarnain shah Aug 03 '18 at 04:10
Works fine for me.Thanks – Md Nakibul Hassan May 23 '19 at 07:08
always get access from last fragment if I try to access from first or second fragment – Zahidul Aug 07 '19 at 05:01
2

Android docs are written in a very stupid way. Docs quoted as `Specifically, the fragment can access the Activity instance with getActivity() and easily perform tasks such as find a view in the activity layout` yet Android Studio warning reads as `getActivity() may be null` – Farid Aug 10 '19 at 13:36
@FARID feel free to file a issue with google at android issues tracker. The docs might be updated. the warning is a lint warning. getactivity can be null if you try to access it even before the fragment is attached to the activity. – Raghunandan Aug 10 '19 at 16:58
for Kotlin val view = activity!!.findViewById(R.id.view) – MohammadReza Nov 16 '20 at 08:49
Can we use the activity view reference in fragment xml ? – AndroidDev Jun 23 '21 at 09:51
you can refer to a activity view in fragment – Raghunandan Jun 23 '21 at 11:02
I ended up using `final FloatingActionButton fab = requireActivity().findViewById(R.id.fab);` – Steve Gelman Jan 28 '23 at 17:49
@SteveGelman yes you can use requireActivity() or requireContexgt(). for more info and when to use what https://medium.com/android-news/the-requireactivity-and-requirecontext-example-1c089ce11a3a – Raghunandan Jan 30 '23 at 05:13

score 9 · Answer 2 · answered Mar 27 '17 at 06:28

At first, create a view like this:

View view = getActivity().findViewById(R.id.viewid);

Then convert it to any view that you need like this:

 if( view instanceof EditText ) {
            editText = (EditText) view;
            editText.setText("edittext");
            //Do your stuff
        }

or

if( view instanceof TextView ) {
  TextView textView = (TextView) view;
  //Do your stuff
}

score 9 · Answer 3 · answered Sep 20 '19 at 07:46

9

In Kotlin it is very easy to access parent Activity View in Fragment

activity!!.textview.setText("String")

answered Sep 20 '19 at 07:46

kishan verma

984
15
17

score 2 · Answer 4 · answered Apr 16 '20 at 12:54

Note that if you are using findViewById<>() from activity, it wont work if you call it from fragment. You need to assign the view to variable. Here is my case

This doesn't work

class MainActivity{

    fun onCreate(...){
        //works
        setMyText("Set from mainActivity")
    }

    fun setMyText(s: String){
        findViewById<TextView>(R.id.myText).text = s
    }
}
________________________________________________________________

class ProfileFragment{
    ...

    fun fetchData(){
        // doesn't work
        (activity as MainActivity).setMyText("Set from profileFragment")
    }
}

This works

class MainActivity{

    private lateinit var myText: TextView

    fun onCreate(...){
        myText = findViewById(R.id.myText)

        // works
        setMyText("Set from mainActivity")
    }

    fun setMyText(s: String){
        myText.text = s
    }
}
________________________________________________________________

class ProfileFragment{
    ...

    fun fetchData(){
        // works
        (activity as MainActivity).setMyText("Set from profileFragment")
    }
}

score 2 · Answer 5 · answered May 11 '21 at 04:24

2

if you are using kotlin then you can use this syntax

val view= requireActivity().findViewById<YourVIEW>(R.id.view_id)

answered May 11 '21 at 04:24

Yazdan Ilyas

374
4
8

How to access parent Activity View in Fragment

5 Answers5

Linked