How to set Listener on Switch inside one ViewHolder?

Question

Android

There is such a RecyclerView with 3 view types. The screenshot shows only one type of View.

Tell me how to bind to Switch elements, and put a Listener on them?

package com.vocabulary.enso.Main.WordSetSelection;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.cardview.widget.CardView;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.vocabulary.enso.Learn.LearnActivity;
import com.vocabulary.enso.Main.MainActivity;
import com.vocabulary.enso.R;

import java.util.ArrayList;
import java.util.List;

import model.Data.UnitSet;
import model.Database.Lab;
import model.Database.Model;

import static com.vocabulary.enso.Learn.LearnActivity.LEARN_AKTIVITY_KEY_INDEX;

public class UnitSetSelectionFragment extends Fragment implements UnitSetSelectionContract.ViewLearnFragment {

    UnitSetSelectionContract.PresenterLearnFragment mPresenterLearnFragment;

    private static int TYPE_SET_WITH_CATEGORY = 1;
    private static int TYPE_SET_WITHOUT_CATEGORY = 2;
    private static int EMPTY_TYPE_SET_WITH_CATEGORY = 3;

    RecyclerView mSetRecyclerView;
    SetsAdapter mAdapter;

    FloatingActionButton startLearnButton;

    List<Integer> unitSetIdList = new ArrayList<>();

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
        Model model = Lab.get(getContext());
        mPresenterLearnFragment = new UnitSetSelectionFragmentPresenter(model);
        mPresenterLearnFragment.attachView(this);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.learn_menu, menu);
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mPresenterLearnFragment.detachView();
        mPresenterLearnFragment = null;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }


    @SuppressLint("RestrictedApi")
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_learn, container, false);

        mSetRecyclerView = (RecyclerView)view.findViewById(R.id.flow_rw);

        mSetRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        mPresenterLearnFragment.viewIsReady();

        startLearnButton = view.findViewById(R.id.learnAllSetsButton);
        startLearnButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                BeginExercise();
            }
        });

        return view;
    }

    public static UnitSetSelectionFragment newInstance() {
        Bundle args = new Bundle();
        UnitSetSelectionFragment fragment = new UnitSetSelectionFragment();
        fragment.setArguments(args);
        return fragment;
    }

    public void BeginExercise(){
        Intent intent = new Intent(getActivity(), LearnActivity.class);
        ArrayList<Integer> unitSetIdList = new ArrayList<>();
        unitSetIdList.add(0);
        intent.putIntegerArrayListExtra(LEARN_AKTIVITY_KEY_INDEX,unitSetIdList);
        ((MainActivity) getActivity()).startActivity(intent);
    }


    @SuppressLint("RestrictedApi")
    public void UpdateUI(List<UnitSet> unitSetList) {
        List<UnitSet> unitSet = unitSetList;
        mAdapter = new SetsAdapter(unitSet);
        mSetRecyclerView.setAdapter(mAdapter);

        if(unitSet.size()>0) {
            startLearnButton.setVisibility(View.VISIBLE);
        }
    }

    public boolean isFirstWordSetFragmentInFolder(UnitSet unitSet, List<UnitSet> unitSets){
        List<UnitSet> subWordsets = new ArrayList<>();
        int minFolderID;

        //Создание коллекции WordSets с FolderId таким же как и у unitSet.
        for(UnitSet tmpWordset : unitSets){
            if(unitSet.getFolderId() == tmpWordset.getFolderId()){
                subWordsets.add(tmpWordset);
            }
        }

        //Поиск минимального значения. WordSetID не может быть равен нулю. Только у каталогов без категории
        minFolderID = subWordsets.get(0).getUnitSetId();//инициализация первым значением, чтобы было с чем сравнивать.

        for(UnitSet tmpWordset : subWordsets){
            if(tmpWordset.getUnitSetId() < minFolderID){
                minFolderID = tmpWordset.getUnitSetId();
            }
        }

        if (unitSet.getUnitSetId() > minFolderID) {
            return false;
        }

        else {
            return true;
        }
    }



    private class SetsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{

        private List<UnitSet> mUnitSets;

        public SetsAdapter(List<UnitSet> unitSet){
            mUnitSets = unitSet;
        }

        @NonNull
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

            View view;
            if(viewType==TYPE_SET_WITH_CATEGORY){
                view = LayoutInflater.from(getActivity()).inflate(R.layout.category_item,parent, false);
                return new SetWithCategoryHolder(view);
            }
            if(viewType==EMPTY_TYPE_SET_WITH_CATEGORY){
                view = LayoutInflater.from(getActivity()).inflate(R.layout.empty_category_item,parent, false);
                return new EmptySetWithCategoryHolder(view);
            }
            else{
                view = LayoutInflater.from(getActivity()).inflate(R.layout.category_item_inner, parent, false);
                return new SetWithoutCategoryHolder(view);
            }
        }

        @Override
        public int getItemViewType(int position) {

            if (mUnitSets.get(position).getFolderId()==0&& isFirstWordSetFragmentInFolder(mUnitSets.get(position), mUnitSets)){
                return EMPTY_TYPE_SET_WITH_CATEGORY;
            }

            else if(isFirstWordSetFragmentInFolder(mUnitSets.get(position), mUnitSets)){
                return TYPE_SET_WITH_CATEGORY;
            }

            else{
                return TYPE_SET_WITHOUT_CATEGORY;
            }
        }

        @Override
        public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, final int position) {
            if(getItemViewType(position)==TYPE_SET_WITH_CATEGORY){
                ((SetWithCategoryHolder)holder).bind(mUnitSets.get(position));
            }
            else if(getItemViewType(position)==EMPTY_TYPE_SET_WITH_CATEGORY){
                ((EmptySetWithCategoryHolder)holder).bind(mUnitSets.get(position));
            }
            else{
                ((SetWithoutCategoryHolder)holder).bind(mUnitSets.get(position));
            }
        }

        @Override
        public int getItemCount() {
            return mUnitSets.size();
        }

        class SetWithCategoryHolder extends RecyclerView.ViewHolder{
            private UnitSet mUnitSet;
            private CardView mCardView;
            private TextView mSetsName;
            private TextView mCategoryName;

            public SetWithCategoryHolder (@NonNull View itemView){
                super(itemView);
                mCardView = (CardView)itemView.findViewById(R.id.card_view_with_category);
                mSetsName = (TextView)itemView.findViewById(R.id.set_name_with_category);
                mCategoryName = (TextView)itemView.findViewById(R.id.category_name);
            }

            public void bind(UnitSet unitSet){
                mUnitSet = unitSet;
                mSetsName.setText(unitSet.getUnitSetName());
                mCategoryName.setText(mPresenterLearnFragment.loadFolderNameById(unitSet.getFolderId()));
            }
        }

        class EmptySetWithCategoryHolder extends RecyclerView.ViewHolder{
            private UnitSet mUnitSet;
            private CardView mCardView;
            private TextView mSetsName;

            public EmptySetWithCategoryHolder (@NonNull View itemView){
                super(itemView);
                mCardView = (CardView)itemView.findViewById(R.id.card_view_without_category);
                mSetsName = (TextView)itemView.findViewById(R.id.set_name_without_category);
            }

            public void bind(UnitSet unitSet){
                mUnitSet = unitSet;
                mSetsName.setText(unitSet.getUnitSetName());
            }
        }

        class SetWithoutCategoryHolder extends RecyclerView.ViewHolder{
            private UnitSet mUnitSet;
            private CardView mCardView;
            private TextView mSetsName;

            public SetWithoutCategoryHolder (@NonNull View itemView){
                super(itemView);
                mCardView = (CardView)itemView.findViewById(R.id.card_view_without_category);
                mSetsName = (TextView)itemView.findViewById(R.id.set_name_without_category);
            }

            public void bind(UnitSet unitSet){
                mUnitSet = unitSet;
                mSetsName.setText(unitSet.getUnitSetName());

            }
        }

    }

}

Answer 1

find it in the right holder and install it. What's wrong with that?