How to pass or send data from recyclerview adapter to fragment

Question

How to pass data from recyclerview adapter to fragment and what i have to write the code in fragment to receive data.I have already check the links in this website but unfor

Answer 1

You have "ClickListener" in fragment.

for example.

@Override
public void onResume(){
    super.onResume();
    ((ExampleAdapter) mAdapter).onItemClick(new RecyclerViewItemClick() {
        @Override
        public void onItemClick(int position, View v) {
            //to do. ArrayList<> data.get(position).getYourItem();
        }
    });
}

And you must create interface RecyclerViewItemClick.java

public interface RecyclerViewItemClick {
    public void onItemClick(int position, View v);
}

Last. ExampleAdapter.java add

public void onItemClick(RecyclerViewItemClick mclick){
   this.myClickListener = mclick;
}

ExampleViewHolder method add in

@Override
public void onClick(View v) {
    myClickListener.onItemClick(getAdapterPosition(), v);
    notifyDataSetChanged();
}

I hope you solve this problem. Thank.

Answer 2

Have a IDataCollector interface. Implement her in the Fragment, pass the Fragment reference as a constructor parameter, and use it inside the adapter

public interface IDataCollector {
    void setText(String text);
    void setAnything(Object anything);
}

// Fragment

public class Fragment implements IDataCollector {

    private void initView() {
        // Add this as a parameter
        ExampleAdapter adapter = new ExampleAdapter(... , this);
    }

    @Override
    public void setText(String text){
        this.textField = text;
    }

    @Override
    public void setText(Object anything){
        this.anything = anything;
    }
}

// Adapter code

// Constructor, parameters ommited
public ExampleAdapter(...., IDataCollector dataCollector) {
    this.dataCollector = dataCollector;
}

@Override
public void onBindViewHolder(@NonNull ExampleViewHolder exampleViewHolder, int i) {
    final ExampleItem currentItem=mExampleList.get(i);
    exampleViewHolder.mTextView.setText(currentItem.getmText());
    exampleViewHolder.mTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dataCollector.setText(((TextView)v.findViewById(R.id.label1)).getText());
            ....
        }
    });
}

Answer 3

You can pass data by attaching a callback into your adapter:

Create an interface:

interface OnTextClickListener {
    void onTextClick(ExampleItem data);
}

Delegate the callback:

class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {

    List<ExampleItem> items;
    OnTextClickListener listener;

    ExampleAdapter(List<ExampleItem> items, OnTextClickListener listener) {
        this.items = items;
        this.listener = listener;
    }

    @Override
    public void onBindViewHolder(ExampleViewHolder viewHolder, int position) {
        viewHolder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Say you want to pass an ExampleItem back to the fragment...
                ExampleItem data = items.get(position);
                listener.onTextClick(data);
            }
        });
    }
}

Implement the fragment with the interface:

class YourFragment extends Fragment implements OnTextClickListener {

    public onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        recyclerView.setAdapter(new ExampleAdapter(this));
    }

    void onTextClick(ExampleItem data) {
        // Now you can do however you want with the data here...
        Toast.makeText(getActivity(), "Got: " + data, Toast.LENGTH_SHORT).show()
    }
}

Answer 4

You have two options;

Using SharedPreferences:

Context myContext = exampleViewHolder.itemView.getContext()

SharedPreferences.Editor editor = getSharedPreferences("DeviceToken", MODE_PRIVATE).edit();
editor.putString("YourKeyNameHere", currentItem.getmText()); // or add toString() after if needed
editor.apply();

_{To get:}

SharedPreferences prefs = getSharedPreferences("DeviceToken", MODE_PRIVATE);
String deviceToken = prefs.getString("YourKeyNameHere", null); // get it here

Using Intent: (If you want to start the another Activity when you pass the data)

Intent intent = new Intent(myContext , SignoutActivity.class);
intent.putExtra("EXTRA_TEXT", currentItem.getmText());
startActivity(intent); // if needed, add myContext before starting myContext.startActivity...

_{To get:}

String extraText = getIntent().getStringExtra("EXTRA_TEXT");

Answer 5

Through Interface you can solve this 1. create an Interface in adapter , add required methods 2. call those methods in adapter wherever required 3. implement the interface in fragment or activity, pass a context to the adapter