<...>
public List<ChatsEntity> listContents = new ArrayList<>();
private ViewHolder mViewHolder = new ViewHolder();
private ChatsEntity mChatsEntity;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    listContents = new ArrayList<>();
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    final View view = inflater.inflate(R.layout.fragment_list, container, false);

    this.mContext = view.getContext();

    this.mViewHolder.mRecyclerViewContacts = view.findViewById(R.id.recycler_contacts);
    this.mViewHolder.mTextHead = view.findViewById(R.id.head_list);
    this.mViewHolder.mTextOffline = view.findViewById(R.id.txt_offline);
    this.mViewHolder.mTextOffline.setVisibility(View.GONE);

    RetrieveDataAPI retrieveDataAPI = new RetrieveDataAPI(mContext,"");
    retrieveDataAPI.retornaValoresRetornados();

    return view;
}
<...>

//Method that get JSON from RetrieveDataAPI
public void recebeDados(String recebido) throws JSONException {
    recebidoAPI = recebido;

    JSONObject jsonObject = new JSONObject(recebido);

    for (int i = 0; i < jsonObject.length(); i++) {
        String id = jsonObject.getString("id");
        String name = jsonObject.getString("name");
        String description = jsonObject.getString("description");

        Log.d("ListFragment", "id: " + id);
        Log.d("ListFragment", "name: " + name);
        Log.d("ListFragment", "description: " + description);

        retornaValores(id, name, description);
    }
}

private void retornaValores(String id_valor, String name_valor, String desc_valor) {
    ChatsEntity mChatsEntity;
    mChatsEntity = new ChatsEntity(id_valor, name_valor, desc_valor);
    mChatsEntity.setName(name_valor);
    mChatsEntity.setDescription(desc_valor);

    if(id_valor == null){
        Log.d("ERRONULO1","null id");
    }else{
        listContents.add(mChatsEntity);
        listAux = listContents;
    }
    retornaList();
}

private void retornaList() {
    if (listContents.size() == 0) {
        Log.e("listContents.size()","" + listContents.size());

    } else {
        this.mGuestListAdapter = new ContactsAdapter(listContents, this.mChatsListener);
        this.mViewHolder.mRecyclerViewContacts.setLayoutManager(new LinearLayoutManager(getContext()));
        this.mViewHolder.mRecyclerViewContacts.setHasFixedSize(true);

        this.mViewHolder.mRecyclerViewContacts.setAdapter(this.mGuestListAdapter);
        this.mGuestListAdapter.notifyDataSetChanged();
    }
}

private static class ViewHolder {
    RecyclerView mRecyclerViewContacts;
    TextView mTextHead;
    TextView mTextOffline;
}

public class RetrieveDataAPI {

private ViewHolder mViewHolder = new ViewHolder();

private Context mContext;
public List<ChatsEntity> list_API;

public RetrieveDataAPI(Context context, String table_name) {
    this.mViewHolder.table_API = table_name;
    this.mContext = context;
}

private void loadChats() {
    final ProgressDialog progressDialog = new ProgressDialog(mContext);
    progressDialog.setTitle("Loading list");
    progressDialog.setMessage("Loading...");
    progressDialog.show();

    Runnable progressRunnable = new Runnable() {
        @Override
        public void run() {
            progressDialog.cancel();
        }
    };

    Handler pdCanceller = new Handler();
    pdCanceller.postDelayed(progressRunnable, 5000);

    StringRequest stringRequest = new StringRequest(com.android.volley.Request.Method.GET,
            ChatConstants.URL_PASTEL, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            progressDialog.dismiss();
            try {
                JSONArray jsonArray = new JSONArray(response);

                for (int i = 0; i < jsonArray.length(); i++) {

                    JSONObject jo = jsonArray.getJSONObject(i);
                    mViewHolder.valores = jo.toString();
                    ListFragment listFragment = new ListFragment();
                    listFragment.recebeDados(mViewHolder.valores);
                    carregaValoresRetornados(mViewHolder.valores);
                }
            } catch (JSONException e) {
                Toast.makeText(mContext, e.getMessage() + "Problema ao carregar JSON!", Toast.LENGTH_LONG).show();
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(mContext, "Error to load data", Toast.LENGTH_LONG).show();
        }
    });
    RequestQueue requestQueue = Volley.newRequestQueue(mContext);
    requestQueue.add(stringRequest);
}
public class ViewHolder{
    private String table_API;
    private String valores;
}
public void carregaValoresRetornados(String valoresAPI) {
    mViewHolder.valores = valoresAPI;
}
public String retornaValoresRetornados() {
    loadChats();
    return mViewHolder.valores;
}