My checkbox is not saving when closing and opening the application

I'm trying to get the box to be saved when I open the application again, but when I close and open it it always comes back empty. I've faced many pointer errors trying to resolve this, I've tried creating directly in the onCreate method, but nothing works.

MainActivity

package br.mateus.appTarefas;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ListView;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import java.util.List;

import br.mateus.appTarefas.model.ListaTarefaAdapter;
import br.mateus.appTarefas.model.Tarefa;
import br.mateus.appTarefas.persistance.TarefaBD;
import br.mateus.appTarefas.persistance.TarefaDAO;

public class MainActivity extends AppCompatActivity{
    private EditText titulo;
    private EditText descricao;
    private ImageButton botaoSalvar;
    private ListView listar;
    private List<Tarefa>item;
    private ListaTarefaAdapter arrayTarefa;
    private TarefaDAO dao;
    private Tarefa t;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTheme(R.style.Theme_App);
        setContentView(R.layout.activity_main);
        mapearXML();
        verificar();
        click();
        check();
        arrayTarefa = new ListaTarefaAdapter(getApplicationContext(),item);
        listar.setAdapter(arrayTarefa);
    }

    private void mapearXML(){
        titulo = findViewById(R.id.idTitulo);
        descricao = findViewById(R.id.idDescricao);
        botaoSalvar = findViewById(R.id.idSalvar);
        listar = findViewById(R.id.idLista);
    }

    private void verificar(){
        if(dao==null){
            dao = new TarefaBD(this);
        }
        item=dao.listar();
    }

    private void check(){
        View checkLayout = getLayoutInflater().inflate(R.layout.linha,null);
        CheckBox check = checkLayout.findViewById(R.id.idCheckBox);

        SharedPreferences sharedPreferences = getSharedPreferences("MyPrefs", MODE_PRIVATE);
        boolean isChecked = sharedPreferences.getBoolean("checkBoxState", false);
        check.setChecked(isChecked);
        check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                SharedPreferences.Editor editor = getSharedPreferences("MyPrefs", MODE_PRIVATE).edit();
                editor.putBoolean("checkBoxState", isChecked);
                editor.apply();
            }
        });
    }

    private void click(){
        botaoSalvar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.d("MainActivitya","Item clicado");

                String tituloTarefa = titulo.getText().toString().trim();
                String descricaoTarefa = descricao.getText().toString().trim();
                if (tituloTarefa.isEmpty() ) {
                    titulo.setError("Este campo não pode estar vazio.");
                }else if(descricaoTarefa.isEmpty()){
                    descricao.setError("Este campo não pode estar vazio.");
                }else{
                    if (t == null) {
                        t = new Tarefa();
                    }
                    t.setTitulo(tituloTarefa);
                    t.setDescricao(descricaoTarefa);
                    if (t.getId() == null) {
                        dao.salvar(t);
                    } else {
                        dao.editar(t);
                    }
                    limparCampos();
                    atualizarItens();
                }
            }
            });

        listar.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
                final Tarefa tarefaSelecionada = item.get(position);

                LinearLayout itemLayout = view.findViewById(R.id.idItem); // Substitua "R.id.itemLayout" pelo ID correto do seu LinearLayout no arquivo linha.xml

                itemLayout.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        mostrarDialogoEditarExcluir(tarefaSelecionada);
                    }
                });
            }
        });



    };

    private void mostrarDialogoEditarExcluir(final Tarefa tarefa) {
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(MainActivity.this);
        dialogBuilder.setTitle("Opções");
        dialogBuilder.setMessage("Escolha uma opção para a tarefa:");

        dialogBuilder.setPositiveButton("Editar", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                abrirDialogoEditar(tarefa);
            }
        });

        dialogBuilder.setNegativeButton("Excluir", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                mostrarDialogoConfirmacaoExcluir(tarefa);
            }
        });

        dialogBuilder.setNeutralButton("Cancelar", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                // Ação a ser realizada quando o botão "Cancelar" for clicado
            }
        });

        dialogBuilder.create().show();
    }
    private void abrirDialogoEditar(final Tarefa tarefa) {
        AlertDialog.Builder editarDialogBuilder = new AlertDialog.Builder(MainActivity.this);
        editarDialogBuilder.setTitle("Editar Tarefa");

        // Inflar o layout do diálogo de edição
        View editarView = getLayoutInflater().inflate(R.layout.dialog_editar, null);
        editarDialogBuilder.setView(editarView);

        final EditText editarTitulo = editarView.findViewById(R.id.idTitulo);
        final EditText editarDescricao = editarView.findViewById(R.id.idDescricao);

        editarTitulo.setText(tarefa.getTitulo());
        editarDescricao.setText(tarefa.getDescricao());

        editarDialogBuilder.setPositiveButton("Salvar", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                String novoTitulo = editarTitulo.getText().toString();
                String novaDescricao = editarDescricao.getText().toString();

                // Atualize a tarefa com os novos valores aqui
                tarefa.setTitulo(novoTitulo);
                tarefa.setDescricao(novaDescricao);

                // Atualize a tarefa no banco de dados
                dao.editar(tarefa);

                // Atualize a lista de tarefas na interface do usuário
                atualizarItens();
            }
        });

        editarDialogBuilder.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                // Ação a ser realizada quando o botão "Cancelar" for clicado
            }
        });

        editarDialogBuilder.create().show();
    }
    private void mostrarDialogoConfirmacaoExcluir(final Tarefa tarefa) {
        AlertDialog.Builder confirmarExclusaoDialogBuilder = new AlertDialog.Builder(MainActivity.this);
        confirmarExclusaoDialogBuilder.setTitle("Confirmar Exclusão");
        confirmarExclusaoDialogBuilder.setMessage("Tem certeza de que deseja excluir esta tarefa?");

        confirmarExclusaoDialogBuilder.setPositiveButton("Excluir", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                // Execute a exclusão da tarefa aqui
                dao.remove(tarefa);

                // Atualize a lista de tarefas na interface do usuário
                atualizarItens();
            }
        });

        confirmarExclusaoDialogBuilder.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                // Ação a ser realizada quando o botão "Cancelar" for clicado
            }
        });

        confirmarExclusaoDialogBuilder.create().show();
    }

    private void atualizarItens(){
        item.clear();
        item.addAll(dao.listar());
        arrayTarefa.notifyDataSetChanged();
    }

    private void limparCampos(){
        titulo.setText(" ");
        descricao.setText(" ");
        t=null;
    }

    public void cancelar(View view){
        AlertDialog.Builder cancela = new AlertDialog.Builder(this);
        cancela.setTitle("Deseja mesmo sair?");
        cancela.setPositiveButton("Sair", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                finish();
            }
        });
        cancela.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

            }
        });
        cancela.create().show();
    }
}

activity_main xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:id="@+id/idPrincipal"
    android:layout_height="match_parent"
    android:background="@color/azulescuro"
    >

    <ListView

        android:id="@+id/idLista"
        android:layout_width="401dp"
        android:layout_height="331dp"
        android:layout_marginTop="392dp"
        android:textFilterEnabled="false"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />


    <ImageButton
        android:id="@+id/idCancelar"

        android:layout_width="77dp"
        android:layout_height="120dp"
        android:layout_marginStart="4dp"
        android:layout_marginBottom="8dp"
        android:backgroundTint="#00FFFFFF"
        android:contentDescription="Sair"
        android:onClick="cancelar"
        android:src="@drawable/sair"
        app:layout_constraintBottom_toTopOf="@+id/idTitulo"
        app:layout_constraintStart_toEndOf="@+id/idSalvar" />

    <ImageButton
        android:id="@+id/idSalvar"
        android:layout_width="67dp"
        android:layout_height="86dp"
        android:layout_gravity="center"
        android:layout_marginStart="272dp"
        android:layout_marginBottom="24dp"
        android:backgroundTint="#00FFFFFF"
        android:contentDescription="Adicionar"
        android:scaleType="fitCenter"
        android:src="@drawable/adicionar"
        app:layout_constraintBottom_toTopOf="@+id/idTitulo"
        app:layout_constraintStart_toStartOf="parent" />

    <EditText
        android:id="@+id/idTitulo"
        android:layout_width="396dp"
        android:layout_height="73dp"
        android:layout_marginStart="4dp"
        android:layout_marginTop="116dp"
        android:ems="10"
        android:hint="Título"
        android:inputType="text"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/idDescricao"
        android:layout_width="394dp"
        android:layout_height="142dp"
        android:layout_marginStart="4dp"
        android:layout_marginTop="36dp"
        android:ems="10"
        android:hint="Descrição"
        android:inputType="text"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/idTitulo" />
</androidx.constraintlayout.widget.ConstraintLayout>

linha.xml (where is the checkbox)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/idItem"
    android:layout_width="400dp"
    android:layout_height="50dp"
    android:orientation="vertical"
    android:descendantFocusability="blocksDescendants">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <CheckBox
            android:id="@+id/idCheckBox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/textTitulo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Texto da Linha 1" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textDescricao"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="30dp"
            android:text="Texto da Linha 2" />
    </LinearLayout>

</LinearLayout>