How to make a favorite menu from a checkbox?

I have a doubt. When making an APP of phrases, I included when I clicked on a certain sentence an AlertDialog that has a checkbox, I would like to store all items that are checked with checkbox and play in a new activity that will be called a favorite and will be accessed from Button, but I do not know how to do it.

The code for my AlertDiagol and CheckBox is here:

// EVENTO DE CLIQUE

           lista.setOnItemClickListener(new AdapterView.OnItemClickListener() {
               @Override
               public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {


                   // CHECK BOX

                   View checkBoxView = View.inflate(FraseAutorFrase.this, R.layout.checkbox, null);

                   CheckBox checkBox = (CheckBox) checkBoxView.findViewById(R.id.checkbox);
                   checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                       @Override
                       public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                           // Save to shared preferences
                       }
                   });
                   checkBox.setText("Marcar como Favorito?");


                    // ALERT DIALOG

                    final String items = "Favorito";
                    final ArrayList seletedItems=new ArrayList();

                    //atributo da classe.

                    //Cria o gerador do AlertDialog
                    AlertDialog.Builder builder = new AlertDialog.Builder(FraseAutorFrase.this);
                    builder.setTitle("O que deseja fazer?");//define o titulo
                    builder.setMessage("Digite aqui sua mensagem!");//define a mensagem
                    builder.setView(checkBoxView);

                    //define um botão como positivo
                    builder.setNeutralButton("OK", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface arg0, int arg1) {

                        }
                    });

                    //define um botão como compartilhar
                    builder.setPositiveButton("Compartilhar", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface arg0, int arg1) {
                            Toast.makeText(FraseAutorFrase.this, "Você clicou no botão Compartilhar", Toast.LENGTH_SHORT).show();

                            Intent sendIntent = new Intent();
                            sendIntent.setAction(Intent.ACTION_SEND);
                            sendIntent.putExtra(Intent.EXTRA_TEXT, frasesR[position] );
                            sendIntent.setType("text/plain");
                            startActivity(sendIntent);
                        }
                    });

                    alerta = builder.create();//cria o AlertDialog
                    alerta.show();//Exibe
               }
           });

Thank You!!!