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?

Answer 1

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(); 

Answer 2

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

1. You can also send broadcast from adapter and register it in fragment.

2. Use interface. Refer this SO question for details.