How do I store more than one value using SharedPreferences?

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How do I store more than one value using SharedPreferences?

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#1 by (1 votes)

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I'm making an app where I created a checkbox to represent a favorite item.

The problem I'm having is what I'm having is when I put more than one item as a favorite, the last one replaces the first one, that is, it's allowing you to add only one record.

How can I save multiple records using sharedPreferences?

Follow my code:

MAIN ACTIVITY

// 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
                           SharedPreferences sharedPreferences = getSharedPreferences("arquivoPreferencia", MODE_PRIVATE);
                           SharedPreferences.Editor editor = sharedPreferences.edit();
                           editor.putString("frase", frasesR[position]);
                           editor.commit();
                       }
                   });
                   checkBox.setText("Marcar como Favorito?");
                   // Recuperar dados
                   SharedPreferences sharedPreferences = getSharedPreferences(ARQUIVO_PREFERENCIA, MODE_PRIVATE);
                   if (sharedPreferences.contains("frase"))
                   {
                       Intent intent = new Intent(FraseAutorFrase.this, Favoritos.class);
                   }

ACTIVITY FAVORITES

SharedPreferences sharedPreferences = getSharedPreferences("arquivoPreferencia", MODE_PRIVATE);
        String fraseR = sharedPreferences.getString("frase","Não Existem Favoritos!");
            // CRIANDO O ARRAY
            final String[] frasesFavoritoArray =
                    {
                            fraseR
                    };
            // UTILIZANDO O ADPTADOR PARA RECEBER O LISTVIEW
            ArrayAdapter<String> adaptador = new ArrayAdapter<String>
                    (
                            // Primeiro Parametro do Array Adpater é o Context
                            getApplicationContext(),
                            // Segundo Parametro do Array Adpater é o Layout
                            android.R.layout.simple_list_item_1,
                            android.R.id.text1,
                            // Terceiro Parametro do Array Adapter é indicar o nome do Array para exibição
                            frasesFavoritoArray
                    );
            lista.setAdapter(adaptador);

java android sharedpreferences

asked by anonymous 29.05.2017 / 21:23

1 answer

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score 1 · Accepted Answer

The values saved in SharedPreferences work as a "Key-Value" pair. To save multiple values, you have to use different keys. In your case, you are using the same key "phrases" for the entire list. You can do something like this in your code:

editor.putString("frase" + position, frasesR[position]);

It will save the data in the keys "phrase1", "phrase2", etc. Then you have to adapt the code that reads those keys.

Particularly it is not a good practice to use SharedPreferences to save a lot of data, especially if the data in your list is dynamic, since the saved data may not match when it was saved.