Checked RadioButton Recycling

Question

I'm adding radiogroups programatically to my recyclerview and it's working fine. But when I check it and scroll the recyclerview it loses checked radios.

I've seen many ways and examples of solutions, but I cannot achieve it. It's been some days in a row.

I'm saving the checked radio in model as you can see in code below.

Adapter:

@Override
public void onBindViewHolder(final NROptionLineHolder holder, int position) {

    holder.priceGroup.removeAllViews();
    holder.priceGroup.setOnCheckedChangeListener(null);

    int id = (position+1)*100;
    checklistModel = mChecklists.get(position);
    holder.packageName.setText(checklistModel.getTitle());

    for(String price : checklistModel.getQuestions()){
        RadioButton rb = new RadioButton(NROptionLineAdapter.this.context);
        rb.setId(id++);
        rb.setText(price);
        holder.priceGroup.addView(rb);
    }
    holder.priceGroup.check(checklistModel.getSelectedId());

    holder.priceGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            checklistModel.setSelectedId(checkedId);
            Log.d(TAG, "onCheckedChanged: " + checkedId);
        }
    });

}

Holder

    OnNROptionListener onNROptionListener;

    public NROptionLineHolder(View itemView, OnNROptionListener onNROptionListener) {
        super(itemView);

        packageName = itemView.findViewById(R.id.package_name);
        priceGroup = itemView.findViewById(R.id.price_grp);

//        priceGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
//            @Override
//            public void onCheckedChanged(RadioGroup radioGroup, int i) {
//
//                Log.d(TAG, "onCheckedChanged: " + radioGroup.getCheckedRadioButtonId() + " " + i);
//            }
//        });

        this.onNROptionListener = onNROptionListener;
        itemView.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        onNROptionListener.onNROptionClick(getAdapterPosition());
    }

    public interface OnNROptionListener {
        void onNROptionClick(int position);
    }
}

EDIT 1 - Radio Group

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView
        android:id="@+id/package_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <RadioGroup
        android:id="@+id/price_grp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@+id/package_name"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:orientation="horizontal"/>
</android.support.constraint.ConstraintLayout>

EDIT 2

As requested, here is the important code from my ChecklistActivity

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_checklist);

    intent = getIntent();
    size = intent.getIntExtra("size", 0);
    nr = intent.getIntExtra("nr", 0);

    Log.d(TAG, "Checklist Activity - Qtd Questões: " + size);
    Log.d(TAG, "Checklist Activity - NR: " + nr);

    btnSaveCheck = findViewById(R.id.btnSaveChecklist);

    mRecyclerView = findViewById(R.id.package_lst);
    setupRecycler();

    btnSaveCheck.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getApplicationContext(), "Sucesso", Toast.LENGTH_SHORT).show();
        }
    });
}

private void setupRecycler() {

    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(layoutManager);

    setupList();

    mAdapter = new NROptionLineAdapter(data, this, getApplication());
    mRecyclerView.setAdapter(mAdapter);

}

private void setupList(){
    data = new ArrayList<>();

    class setupList extends AsyncTask<Void, Void, List<MRNrOption>> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected List<MRNrOption> doInBackground(Void... voids) {

            list = DatabaseClient
                    .getInstance(getApplicationContext())
                    .getAppDatabase()
                    .mrNrOptionDAO()
                    .loadAllByNRId(nr);
            return list;

        }

        @Override
        protected void onPostExecute(List<MRNrOption> list) {
            super.onPostExecute(list);

            List<String> priceList = new ArrayList<>();
            priceList.add("Sim");
            priceList.add("Não");
            priceList.add("Não se Aplica");

            for (int i=0; i<list.size(); i++) {
                Log.d(TAG, "NRs Activity - Adding To List: " + list.get(i).getTitle());
                data.add(new Checklist(
                        list.get(i).getTitle(),
                        priceList)
                );

                mAdapter.notifyDataSetChanged();
            }

        }
    }

    setupList lm = new setupList();
    lm.execute();
}

EDIT 3 - Important

The RadioGroups and RadioButtons are programatically generated because I'm getting all questions from server, the number of questions are different depending on previous selections made by user, that's why I need it this way.

EDIT 4

GIF to enhance the problem visualization

EDIT 5 - Checklist Model Class

    public class Checklist {

    String title;
    List<String> questions;
    boolean isRadioButtonAdded;
    int selectedId;

    public Checklist(String title, List<String> questions) {
        this.title = title;
        this.questions = questions;
    }

    public Checklist(){}

    public boolean getIsAdded(){
        return isRadioButtonAdded;
    }

    public void setIsAdded(boolean isAdded){
        this.isRadioButtonAdded = isAdded;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public List<String> getQuestions() {
        return questions;
    }

    public void setQuestions(List<String> questions) {
        this.questions = questions;
    }

    public int getSelectedId() {
        return selectedId;
    }

    public void setSelectedId(int selectedId) {
        this.selectedId = selectedId;
    }
}

Answer 1

The unique working solution was to set RecyclerView to not recycleable in ViewHolder.

this.setIsRecyclable(false);