如何与我的适配器类中的片段进行通信

Question

I have created a custom adapter class. In that class, I have a code that will have to send a message to my fragment, when I clicked on my listview layout. After googling, the best approach to do it may be using interface. Most of them are the example of communicating between activity with the fragment. But in my case, I don't have any ideas about how to communicate between my adapter class with my fragment class. let says I create an interface in my adapter class like:

public interface SuccessResponse{
    void onSuccess();
}

and on the LinearLayout inside my adapter class I want it to be something like:

linearLayout.setOnClickListener(new View.OnClickListener{
    @Override
    public void onClick (View view){
        SuccessResponse.onSuccess();
    }
})

Then I want to make sure my fragment page get the onSuccess() method and do something like :

public class MyFragment extends ListFragment implements Adapter.SuccessResponse{
    @Override
    public void onSuccess(){
        //do Something
    }
}

Is there any way to do something like above?

Answer 1

Update If you are looking for a solution in Kotlin

class ExampleFragment : Fragment() {
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val adapter = MyAdapter(){
            Log.d("zzzz", "$it ")
        }
    }
}


class MyAdapter (val onClick : (value: String) -> Unit): RecyclerView.Adapter<RecyclerView.ViewHolder>() {
    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        holder.itemView.setOnClickListener {
            onClick("something")
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        TODO("Not yet implemented")
    }

    override fun getItemCount(): Int {
        TODO("Not yet implemented")
    }
}

JAVA The following code may help you.

    public class ExampleFragment extends Fragment implements MyAdapter.SuccessResponse{
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View contentView  = inflater.inflate(R.layout.my_layout, container, false);
            MyAdapter myAdapter = new MyAdapter(getActivity(), 0);
            myAdapter.successResponse = this;
            return contentView;
        }
    
        @Override
        public void onSuccess() {
    
        }
    }

    
    class MyAdapter extends ArrayAdapter{
        SuccessResponse successResponse;
    
        public MyAdapter(Context context, int resource) {
            super(context, resource);
        }
    
        public interface SuccessResponse{
            void onSuccess();
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            //ur views
            linearLayout.setOnClickListener(new View.OnClickListener{
                @Override
                public void onClick (View view){
                    if(successResponse!=null)
                        successResponse.onSuccess();
                }
            })
        }
    }

Answer 2

Do it in your CustomAdapter

1) Import Fragment

import android.support.v4.app.Fragment;   

2) Declare frag object in your adapter

     Fragment frag

        public YourAdapter(Fragment frag) {
            this.frag = frag;
        }

3) Now call your fragment method

        linearLayout.setOnClickListener(new View.OnClickListener{
            @Override
            public void onClick (View view){
                ((HomeFragment) frag).onSuccess();// here your fragment name HomeFragment
            }
        })

4) In HomeFragment

    public void onSuccess(){
         // do your stuff here
    }