Call a Fragment method from an Adapter

Question

I have a method sendData() in my fragment. This method starts a new Activity. I want to call this method from my ArrayAdapter.

Here is my code:-

HomeFragment.java

stagAdaper = new StaggeredAdapter(myContext, android.R.layout.simple_list_item_1, getList);
            mGridView.setAdapter(stagAdaper);
    private void sendData(int position)
    {

        myDialog = new ProgressDialog(myContext).show(getActivity(), "Fetching news..", "Just a moment");

        myDialog.getWindow().setContentView(R.layout.openarticlewaitprogress);
        myDialog.getWindow().setTitle("Loading..");
        myDialog.getWindow().setLayout(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
         new  NewsDetails(myDialog);



            Intent nIntent = new Intent(getActivity(),Details.class);

               String Body=getList.get(position).getBody();

            newsIntent.putExtra("Body", Body);


            startActivity(nIntent);

    }

StaggeredAdapter.java

viewHolder.layGridLayout.setOnClickListener(new View.OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            // TODO Auto-generated method stub
            //viewHolder.layGridLayout.setForeground(R.drawable.foreground_selector);

        }
    });
    return convertView;
    }

How can I do it?

look this and you learn how to communicate Fragments : http://stackoverflow.com/questions/24081101/using-localbroadcastmanager-to-communicate-from-fragment-to-activity/24083101#24083101 — Umang Kothari, Jul 01 '14 at 05:11

Shivam Verma · Accepted Answer · 2019-02-25T16:10:41.960

171

Edit : Here is what I would use now. Older, "easier" solutions are available below.

MyFragment extends Fragment implements CustomAdapter.EventListener {

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

        CustomAdapter adapter = new CustomAdapter(..., this);

    }

    void onEvent(int data) {
        doSomething(data);
    }

}

CustomAdapter extends BaseAdapter {

    EventListener listener; 

    public interface EventListener {
        void onEvent(int data);   
    }

    public CustomAdapter(..., EventListener listener) {
        this.listener = listener; 
    }

    ...

}

Now from any place in the adapter we can call listener.onEvent(data); to trigger the method in the fragment.

Moreover, instead of providing a listener through the constructor, we can add another method in the adapter such as registerListener(EventListener eventListener) and then maintain a list of listeners if needed.

Old Answer:

Solution 1 : Make the adapter an inner class of your fragment, so that you can call the method directly.

Solution 2 : Update your adapter constructor to accept the Fragment as a parameter.

Something like :

customAdapter = new CustomAdapter(myContext, android.R.layout.simple_list_item_1, getList, HomeFragment.this);

and update the constructor of the Adapter :

public CustomAdapter(Context context, int id, HomeFragment fragment) {
    this.fragment = fragment;
}

then you call methods using the fragment variable.

fragment.doSomething();

edited Feb 25 '19 at 16:10

answered Jul 01 '14 at 04:29

Shivam Verma

7,973
3
26
34

I tried this. But then I get a NullPointerException at the ProgressDialog variable – user3713706 Jul 01 '14 at 05:07
@user3713706 this solution must be worked, post your logcat, maybe you have an error in some where else – Shayan Pourvatan Jul 01 '14 at 05:09
2

@Shivam It worked had a issue somewhere else. Thank you. – user3713706 Jul 01 '14 at 05:17
Thanks a ton! This solution is the best and simplest one among the ones I came across. – Tanuj Dhaundiyal Feb 25 '16 at 12:18
how to call from OnBindViewholder ? – Kartiikeya Nov 01 '16 at 06:29
1

If i choose solution 2, when fragment is destroyed, will it be released from memory? It is because I worry that fragment retain adapter and adapter retain fragment (loop). – Khant Thu Linn Aug 30 '17 at 06:40
@KhantThuLinn Yes, I think it will be garbage collected. Refer to this: https://stackoverflow.com/a/1910203/1239966 – Shivam Verma Oct 18 '18 at 10:15

score 2 · Answer 2 · edited May 23 '17 at 10:31

2

I know it's late to answer but There are 2 ways more to do it:

You can also send broadcast from adapter and register it in fragment.
Use interface. Refer this SO question for details.

edited May 23 '17 at 10:31

Community

1
1

answered Dec 12 '16 at 16:56

Faisal Shaikh

3,900
5
40
77

This one is considerable. – Stack Overflow Jul 12 '21 at 10:46

score -4 · Answer 3 · answered Jul 01 '14 at 04:37

-4

You can make sendData method as static

public static void sendData(int position)
{
     ......
}

n call it as

@Override
public void onClick(View v) 
{
     // TODO Auto-generated method stub
     HomeFragment.sendData(position)
     ........    
}

answered Jul 01 '14 at 04:37

qulfille

208
3
13

If I do that I cannot access getActivity() – user3713706 Jul 01 '14 at 04:57
you can use **myContext** instead – qulfille Jul 01 '14 at 04:59

Call a Fragment method from an Adapter

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