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嗨，我想做一个简单的新闻阅读器应用程序。在共享偏好中，用户可以选择他可以看到哪些新闻部分。我一直到添加 MultiSelectListPreference 并检索值的点。但不幸的是，它检索所有值，而不仅仅是检查。

这是我的代码：

<MultiSelectListPreference
            android:id="@+id/multiple_choice"
            android:dialogTitle="@string/section_news_label"
            android:entries="@array/news_sections"
            android:entryValues="@array/section_values"
            android:key="section_news_key"
            android:summary="@string/section_hint"
            android:defaultValue="@array/default_array"
            />

public class SettingsActivity extends AppCompatActivity {

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

    public static class NewsPreferenceFragment extends PreferenceFragment
            implements Preference.OnPreferenceChangeListener {

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.settings_main);

            Preference newsToShow = findPreference(getString(R.string.settings_news_show_key));
            bindPreferenceSummaryToValue(newsToShow);
        }

        @Override
        public boolean onPreferenceChange(Preference preference, Object value) {
            String stringValue = value.toString();
            preference.setSummary(stringValue);
            return true;
        }

        private void bindPreferenceSummaryToValue(Preference preference) {
            preference.setOnPreferenceChangeListener(this);
            SharedPreferences preferences =
                    PreferenceManager.getDefaultSharedPreferences(preference.getContext());
            String preferenceString = preferences.getString(preference.getKey(), "");
            onPreferenceChange(preference, preferenceString);
        }
    }
}

SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);


        Set<String> entries = sharedPrefs.getStringSet("section_news_key", null);
         if(entries == null){
             Log.v("!!!!!!!!!", "No entries");
         }else {
             Log.v("!!!!!!!!!", entries.toString());
         }

知道我做错了什么吗？

4

1 回答 1

3

谢谢，我找到了适合我的解决方案。您将需要使用 HashSet。

//Get entries from news sections and store in Set
Set<String> entries = sharedPrefs.getStringSet("section_news_key", new HashSet<String>());

于 2018-08-04T15:53:09.050 回答