problem with Nested recyclerview and LiveData observe - mvvm

Question

I have nested RecyclerView and two LiveData. one is parentList and another one is childList
I managed to use LiveData for ParentAdapter but when I try LiveData for ChildAdapter nothing showen in childAdapter. ParentAdapter is working.
Can someone help me?
Thanks?
this method is in MainActivity.class
private void sendAllDataToAdapter(){
CashFlowViewModel viewModel = ViewModelProviders.of(this).get(CashFlowViewModel.class);
viewModel.cashGroupByDate().observe(this, new Observer<List<CashFlow>>() {
#Override
public void onChanged(List<CashFlow> cashFlows) {
adapter.submitList(cashFlows);
}
});
adapter = new MainAdapter(this, this);
recyclerView.setAdapter(adapter);
}
This is ParentAdapter
public class MainAdapter extends ListAdapter<CashFlow, MainAdapter.MainViewHolder>{
Context context;
List<CashFlow> cashFlowList = new ArrayList<>();
List<CashFlow> cashFlowListChild = new ArrayList<>();
CashflowRepository repository;
CashFlowViewModel viewModel;
LifecycleOwner lifecycleOwner;
public MainAdapter(Context context, LifecycleOwner lifecycleOwner) {
super(diffCallback);
this.context = context;
this.cashFlowList = cashFlowList;
this.cashFlowListChild = cashFlowListChild;
this.repository = repository;
this.lifecycleOwner = lifecycleOwner;
viewModel = ViewModelProviders.of((MainActivity) context).get(CashFlowViewModel.class);
}
private static final DiffUtil.ItemCallback<CashFlow> diffCallback = new DiffUtil.ItemCallback<CashFlow>() {
#Override
public boolean areItemsTheSame(#NonNull CashFlow oldItem, #NonNull CashFlow newItem) {
return oldItem.getId() == newItem.getId();
}
#Override
public boolean areContentsTheSame(#NonNull CashFlow oldItem, #NonNull CashFlow newItem) {
return oldItem.getAdded_date().equals(newItem.getAdded_date())
&& oldItem.getTitle().equals(newItem.getTitle())
&& oldItem.getBody().equals(newItem.getBody());
}
};
#NonNull
#Override
public MainViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.main_adapter, parent, false);
return new MainViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MainViewHolder holder, int position) {
holder.tvDate.setText(getItem(position).getAdded_date());
holder.tvIncome.setText(String.valueOf(getItem(position).getIncome()));
holder.tvExpense.setText(String.valueOf(getItem(position).getExpense()));
ChildAdapter adapter = new ChildAdapter(context);
holder.rvChild.setAdapter(adapter);
viewModel.cashGroupByDate().observe(lifecycleOwner, new Observer<List<CashFlow>>() {
#Override
public void onChanged(List<CashFlow> cashFlows) {
adapter.submitList(cashFlows);
}
});
Log.d("Child", getItem(position).getAdded_date()+"");
}
public class MainViewHolder extends RecyclerView.ViewHolder {
TextView tvDate, tvIncome, tvExpense;
RecyclerView rvChild;
public MainViewHolder(#NonNull View itemView) {
super(itemView);
tvDate = itemView.findViewById(R.id.main_adapter_date);
tvIncome = itemView.findViewById(R.id.main_adapter_income);
tvExpense = itemView.findViewById(R.id.main_adapter_expense);
rvChild = itemView.findViewById(R.id.child_recyclerview);
}
}
This is ChildAdapter
public class ChildAdapter extends ListAdapter<CashFlow, ChildAdapter.ChildViewHolder> {
Context context;
public ChildAdapter(Context context) {
super(diffCallback);
this.context = context;
}
private static final DiffUtil.ItemCallback<CashFlow> diffCallback = new DiffUtil.ItemCallback<CashFlow>() {
#Override
public boolean areItemsTheSame(#NonNull CashFlow oldItem, #NonNull CashFlow newItem) {
return oldItem.getId() == newItem.getId();
}
#Override
public boolean areContentsTheSame(#NonNull CashFlow oldItem, #NonNull CashFlow newItem) {
return oldItem.getAdded_date().equals(newItem.getAdded_date())
&& oldItem.getBody().equals(newItem.getBody())
&& oldItem.getTitle().equals(newItem.getTitle())
&& oldItem.getExpense() == newItem.getExpense()
&& oldItem.getIncome() == newItem.getIncome()
&& oldItem.getType().equals(newItem.getType());
}
};
#NonNull
#Override
public ChildViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.child_adapter, parent, false);
return new ChildViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ChildViewHolder holder, int position) {
holder.imageView.setImageResource(getItem(position).getImage_id());
holder.tvTitle.setText(getItem(position).getTitle());
if (getItem(position).getType().equals(BaseActivity.INCOME)){
holder.tvSum.setText(String.valueOf(getItem(position).getIncome()));
}
else if (getItem(position).getType().equals(BaseActivity.EXPENSE)){
holder.tvSum.setText(String.valueOf(getItem(position).getExpense()));
}
}
public class ChildViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
TextView tvTitle, tvSum;
public ChildViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.child_adapter_image);
tvTitle = itemView.findViewById(R.id.child_adapter_title);
tvSum = itemView.findViewById(R.id.child_adapter_sum);
}
}
}
This is my ViewModel.class
public class CashFlowViewModel extends AndroidViewModel {
private CashflowRepository repository;
public CashFlowViewModel(#NonNull Application application) {
super(application);
repository = new CashflowRepository(application);
}
public void insert(CashFlow cashFlow){
repository.insert(cashFlow);
}
public void update(CashFlow cashFlow){
repository.update(cashFlow);
}
public void delete(CashFlow cashFlow){
repository.delete(cashFlow);
}
public LiveData<List<CashFlow>> cashGroupByDate(){
return repository.getCashGroupByDate();
}
public LiveData<List<CashFlow>> cashByDate(String addedDate){
return repository.getCashByDate(addedDate);
}
public void insertCategory(Category category){
repository.insertCategory(category);
}
public void updateCategory(Category category){
repository.updateCategory(category);
}
public void deleteCategory(Category category){
repository.deleteCategory(category);
}
public List<Category> allCategories(String type){
return repository.getAllCategories(type);
}