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();
}
}