Update all checkbox in nested recycler View when button in Fragment is clicked - android-recyclerview

Question

Hello I am struggling with this problem. I have a RecyclerView with checkboxes items which is nested in another RecyclerView. My problem is that I want all the checkbox to be unchecked when the user click in a button in the fragment. So how could I access the checkbox view holder from my fragment button? Thank you.
Please be comprehensive with the mistakes in my code I am beginner, self-taught and it is my first app. Any help would be really appreciated.
fragment_index_category_filter.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="4dp"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".Fragments.IndexCategoryFilterFragment">
<!-- TODO: Update blank fragment layout -->
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white"
android:gravity="center"
app:layout_constraintTop_toTopOf="parent"
android:theme="#style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="#+id/home_activity_tb"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetEnd="0dp"
app:contentInsetStart="0dp"
android:gravity="center"
android:layout_gravity="center"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<RelativeLayout
android:id="#+id/toolbar"
android:padding="8dp"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.button.MaterialButton
android:id="#+id/close_filters"
android:layout_width="32dp"
android:layout_height="32dp"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:insetLeft="0dp"
android:insetTop="0dp"
android:insetRight="0dp"
android:insetBottom="0dp"
android:padding="0dp"
app:fabCustomSize="50dp"
app:icon="#drawable/cancel"
app:iconGravity="textStart"
app:iconPadding="0dp"
app:iconSize="32dp"
app:shapeAppearanceOverlay="#style/ShapeAppearanceOverlay.MyApp.Button.Circle" />
<com.google.android.material.textview.MaterialTextView
android:id="#+id/appBarTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Category list"
android:textAllCaps="false"
android:textColor="#color/black"
android:textSize="24sp" />
<com.google.android.material.button.MaterialButton
android:id="#+id/save_filters"
app:icon="#drawable/ic_check_ok"
app:iconSize="32dp"
app:iconGravity="textStart"
android:layout_width="32dp"
android:layout_height="32dp"
android:padding="0dp"
app:iconPadding="0dp"
android:insetLeft="0dp"
android:insetTop="0dp"
android:insetRight="0dp"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:insetBottom="0dp"
app:shapeAppearanceOverlay="#style/ShapeAppearanceOverlay.MyApp.Button.Circle"
app:fabCustomSize="50dp"
/>
</RelativeLayout>
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#+id/appBarLayout"
android:id="#+id/shortcuts_filter">
<com.google.android.material.button.MaterialButton
android:id="#+id/clear_filters"
style="#style/Widget.MaterialComponents.Button.OutlinedButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:padding="0dp"
android:text="Clear all"
android:textAllCaps="false"
android:textSize="12sp" />
<com.google.android.material.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="0dp"
android:id="#+id/select_all_filters"
android:textSize="12sp"
android:text="Select all"
android:layout_alignParentEnd="true"
android:textAllCaps="false"
style="#style/Widget.MaterialComponents.Button.OutlinedButton"/>
</RelativeLayout>
<androidx.recyclerview.widget.RecyclerView
android:layout_margin="8dp"
app:layout_constraintTop_toBottomOf="#+id/shortcuts_filter"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/categorySection_rv"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
android:orientation="vertical"/>
</androidx.constraintlayout.widget.ConstraintLayout>
IndexCategoryFilterFragment.java
public class IndexCategoryFilterFragment extends Fragment {
//Initialize variable
List<String> streamFiltersList;
RecyclerView categorySection_rv;
FirebaseDatabase firebaseDatabase;
DatabaseReference dbCategoryReference;
StreamFilterManager streamFilterManager;
MaterialButton save_filters, clear_filters, close_fragment;
FiltersViewModel filtersListObserver;
private FirebaseAuth mAuth;
FirebaseUser firebaseUser;
String userId;
SectionAdapter sectionAdapter;
List<Letter> letterList;
List<Category> categoryInLetter = new ArrayList<>();
public FilterInterface interfaceListener;
public IndexCategoryFilterFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container != null) {
container.removeAllViews();
}
// Inflate the layout for this fragment
mAuth = FirebaseAuth.getInstance();
firebaseUser = mAuth.getCurrentUser();
userId = firebaseUser.getUid();
View view = inflater.inflate(R.layout.fragment_index_category_filter, container, false);
save_filters = view.findViewById(R.id.save_filters);
categorySection_rv = view.findViewById(R.id.categorySection_rv);
clear_filters = view.findViewById(R.id.clear_filters);
close_fragment = view.findViewById(R.id.close_filters);
firebaseDatabase = FirebaseDatabase.getInstance();
dbCategoryReference = firebaseDatabase.getReference("CategoryIndexed");
save_filters.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
streamFilterManager.logOutFromUserSession();
streamFilterManager.writeListInPref(getContext(), streamFiltersList, userId);
Log.d("streamFilter", "onClick: " + streamFiltersList);
filtersListObserver = new ViewModelProvider(requireActivity()).get(FiltersViewModel.class);
filtersListObserver.setFiltersList(streamFiltersList);
getParentFragmentManager().beginTransaction().replace(R.id.fragment_container, new Home(), "home").commit();
}
});
close_fragment.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getParentFragmentManager().popBackStack();
}
});
letterList = new ArrayList<>();
categoryInLetter = new ArrayList<>();
sectionAdapter = new SectionAdapter(getContext(), letterList);
categorySection_rv.setAdapter(sectionAdapter);
firebaseCategoryIndex();
return view;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
#Override
public void onResume() {
super.onResume();
streamFilterManager = new StreamFilterManager(getContext(), userId);
streamFiltersList = streamFilterManager.readFilterList(getContext(), userId);
if (streamFiltersList == null) {
streamFiltersList = new ArrayList<>();
}
clear_filters.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkboxUpdate();
}
});
}
private void firebaseCategoryIndex() {
// First recycler
Query queryLetter = dbCategoryReference.orderByChild("index");
queryLetter.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
letterList.clear();
for (DataSnapshot dsLetter : snapshot.getChildren()) {
Letter letter = dsLetter.getValue(Letter.class);
letterList.add(letter);
}
sectionAdapter.notifyDataSetChanged();
Log.d("letterList", "letterList: " + letterList.size());
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
// solutions testing
public interface FilterInterface {
void clearSelectAllFilters(Button allFilters);
}
private void checkboxUpdate() {
// 1. get ith item of the parent recyclerView
for(int i = 0 ; i< sectionAdapter.getItemCount();i++){
SectionAdapter.ViewHolder viewHolder = (SectionAdapter.ViewHolder) categorySection_rv.findViewHolderForAdapterPosition(i);
RecyclerView recyclerView = viewHolder.section_item_rv;
ItemSectionAdapter itemSectionAdapter = (ItemSectionAdapter) recyclerView.getAdapter();
itemSectionAdapter.update();
}
}
}
SectionAdapter.java
public class SectionAdapter extends RecyclerView.Adapter<SectionAdapter.ViewHolder> implements IndexCategoryFilterFragment.FilterInterface {
Context context ;
List<Letter> letterList;
DatabaseReference categoryListRef;
public SectionAdapter(Context context, List<Letter> letterList) {
this.context = context;
this.letterList = letterList;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.section_category,parent,false);
return new SectionAdapter.ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
List<Category> letterCategoryList = new ArrayList<>();
Letter letter = letterList.get(position);
holder.section_letter.setText(letter.getIndex());
holder.section_title_ll.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int visible = holder.section_item_rv.getVisibility();
if (visible == View.VISIBLE){
holder.section_item_rv.setVisibility(View.GONE);
} else {
holder.section_item_rv.setVisibility(View.VISIBLE);
}
}
});
categoryListRef = FirebaseDatabase.getInstance().getReference("CategoryIndexed").child(letter.getIndex()).child("content");
ItemSectionAdapter itemSectionAdapter = new ItemSectionAdapter(letterCategoryList);
categoryListRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
for (DataSnapshot dsLetterContent : snapshot.getChildren()){
Category category = dsLetterContent.getValue(Category.class);
category.setCheckState(true);
Log.d("letterList", "letterList: "+ category.getCategoryName() + " "+ category.isCheckState());
letterCategoryList.add(category);
}
itemSectionAdapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
holder.section_item_rv.setAdapter(itemSectionAdapter);
}
#Override
public int getItemCount() {
return letterList.size();
}
#Override
public void clearSelectAllFilters(Button allFilters) {
}
public class ViewHolder extends RecyclerView.ViewHolder {
public MaterialTextView section_letter;
public RecyclerView section_item_rv;
public LinearLayout section_title_ll;
public ViewHolder(#NonNull View itemView) {
super(itemView);
section_letter = itemView.findViewById(R.id.section_letter);
section_item_rv = itemView.findViewById(R.id.section_item_rv);
section_title_ll = itemView.findViewById(R.id.section_title_ll);
}
}
}
ItemSectionAdpater.java
public class ItemSectionAdapter extends RecyclerView.Adapter<ItemSectionAdapter.ViewHolder> implements IndexCategoryFilterFragment.FilterInterface {
List<Category> categoryList;
public ItemSectionAdapter(List<Category> categoryList) {
this.categoryList = categoryList;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.index_category_name_item,parent,false);
return new ItemSectionAdapter.ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
Category category = categoryList.get(position);
holder.indexItemCategory.setText(category.getCategoryName());
holder.cb_categoryItem.setChecked(category.isCheckState());
}
#Override
public int getItemCount() {
return categoryList.size();
}
#Override
public void clearSelectAllFilters(Button allFilters) {
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView indexItemCategory;
public CheckBox cb_categoryItem;
public RelativeLayout category_item_rl;
public ViewHolder(#NonNull View itemView) {
super(itemView);
indexItemCategory = itemView.findViewById(R.id.indexItemCategory);
cb_categoryItem = itemView.findViewById(R.id.cb_categoryItem);
category_item_rl = itemView.findViewById(R.id.category_item_rl);
}
}
public void update() {
categoryList.forEach(category -> category.setCheckState(false));
notifyDataSetChanged();
}
}

Answer 1

Make a public method in adapter and then pass your new data with changed checked values to true, and then notify the adapter like shown below (or update the existing method with the code given below).
public void updateList(ArrayList<Category> categoryList) {
this.categoryList = categoryList;
notifyDataSetChanged();
}
then simply call this method wherever you need with the adapter object in your fragment.