How can I include a recyclerView (contains a list of items) in one activity that has other views - android-recyclerview

Question

I want to achieve something like below, my list data is coming from a restful server. Everything is working except that the list is empty.
I used the following;
* Recyclerview Adaptor
* Created a pojo for list items, logs show that that the data is coming through from the server except that the list is not populated
//TransactionsFragment
public class TransactionsFragment extends Fragment {
View rootView;
RecyclerView recyclerView;
String transaction_amount;
String transaction_date_created;
public String authToken;
public TransactionsFragment() {
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_transactions_list, container, false);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
recyclerView = rootView.findViewById(R.id.rv_transactions);
recyclerView.setLayoutManager(linearLayoutManager);
TransactionListAdapter transactionListAdapter = new TransactionListAdapter(getContext(), getTransactions());
recyclerView.setAdapter(transactionListAdapter);
transactionListAdapter.notifyDataSetChanged();
return rootView;
}
private List<Transaction> getTransactions() {
List<Transaction> transactionList = new ArrayList<>();
/........
#Override
public void onNext(List<Transaction> transactions) {
Integer transactionSize = transactions.size();
for (int i =0;i<transactionSize;i++) {
transaction_amount = transactions.get(i).getAmount();
transaction_date_created = transactions.get(i).getDateCreated();
transactionList.add(new Transaction(transactions.get(i).getId(),null,transactions.get(i).getAmount(), transactions.get(i).getDateCreated(), transactions.get(i).getAccount()));
}
/// Data is shown here after running the app so it tells me that we are getting response from the server
Toast.makeText(getActivity(), "Transaction Date Created: " + transaction_date_created + "!", Toast.LENGTH_LONG).show();
}
#Override
public void onError(Throwable e) {
if (e instanceof HttpException) {
HttpException response = (HttpException) e;
int code = response.code();
String msg = response.message();
Toast.makeText(getActivity(), "Transaction Error message: " + msg + "!", Toast.LENGTH_LONG).show();
}
}
#Override
public void onComplete() {
}
});
//...
return transactionList;
}
}
//..TransactionListAdapter
public class TransactionListAdapter extends RecyclerView.Adapter {
private List transactionList;
private Context mContext;
public TransactionListAdapter(Context context, List<Transaction> transactions) {
this.mContext = context;
this.transactionList = transactions;
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
RecyclerView.ViewHolder vh;
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_transactions_single, parent, false);
vh = new OriginalViewHolder(view);
return vh;
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int i) {
if (holder instanceof TransactionListAdapter.OriginalViewHolder) {
TransactionListAdapter.OriginalViewHolder view = (TransactionListAdapter.OriginalViewHolder) holder;
Transaction transaction = transactionList.get(i);
view.tvTransactionAmount.setText(transaction.getAmount());
view.tvTransactionDateCreated.setText(transaction.getDateCreated());
}
}
#Override
public int getItemCount() {
return transactionList.size();
}
public class OriginalViewHolder extends RecyclerView.ViewHolder{
ImageView imgTransactionType;
TextView tvTransactionName, tvTransactionAmount, tvTransactionDateCreated, tvDefaultCurrency, getTvTransactionUSD;
public OriginalViewHolder(View itemView) {
super(itemView);
tvTransactionDateCreated = itemView.findViewById(R.id.tv_transaction_date_created);
tvTransactionAmount = itemView.findViewById(R.id.tv_transaction_amount);
}
}
}
//..MainActivity
public class MainActivity extends AppCompatActivity implements
View parent_view;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
checkConnection();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
}
setContentView(R.layout.activity_home);
initiateViews();
Fragment transFragment = new TransactionsFragment();
final FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.transactions_frame_container, transFragment);
transaction.addToBackStack(null);
transaction.commit();
}
private void initiateViews() {
parent_view = (CoordinatorLayout)findViewById(R.id.home_container);
home_container_id = R.id.frame_container;
}
private void loadFragment(Fragment fragment, Integer container_id) {
// create a FragmentManager
FragmentManager fm = getSupportFragmentManager();
// create a FragmentTransaction to begin the transaction and replace the Fragment
FragmentTransaction fragmentTransaction = fm.beginTransaction();
// replace the FrameLayout with new Fragment
fragmentTransaction.replace(container_id, fragment);
fragmentTransaction.commit(); // save the changes
}
}
//..fragment_transactions_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#color/grey_10" />
<View
android:layout_width="0dp"
android:layout_height="#dimen/spacing_middle" />
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/rv_transactions"
android:scrollbars="vertical"
android:scrollingCache="true"/>
</LinearLayout>