SettingsFragment.java 文件源码

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

    beaconFormatList = new HashSet<>();
    sharedPreferences = getPreferenceManager().getSharedPreferences();

    MultiSelectListPreference list = (MultiSelectListPreference) getPreferenceManager().findPreference("key_beacon_formats");

    Set<String> beaconFormats = sharedPreferences.getStringSet("key_beacon_formats", beaconFormatList);
    CharSequence[] sequences = beaconFormats.toArray(new CharSequence[beaconFormats.size()]);

    list.setEntries(sequences);
    list.setEntryValues(sequences);
}