SwitchPreference的图形不变

Question

SwitchPreference switchPreference = new SwitchPreference(preferenceScreen.getContext());
switchPreference.setKey(sensor.getName());
switchPreference.setTitle(sensor.getName());
switchPreference.setChecked(true);

If I check for the status of the switch with

switchPreference.isChecked()

It returns the correct boolean value as true. However, the switch's graphic is always at the state where it was set on the previous run.

The switches are dynamically created in onCreate()

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.preferences); //almost empty
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
    prefs.registerOnSharedPreferenceChangeListener(this);
    PreferenceScreen preferenceScreen = this.getPreferenceScreen();
    PreferenceCategory preferenceCategory = new PreferenceCategory(preferenceScreen.getContext());
    preferenceCategory.setTitle("Sensor List");
    preferenceScreen.addPreference(preferenceCategory);

    for (TrackingData sensor : SensorService.data)
    {
        SwitchPreference switchPreference = new SwitchPreference(preferenceScreen.getContext());
        switchPreference.setKey(sensor.getName());
        switchPreference.setTitle(sensor.getName());
        switchPreference.setChecked(true);
        Log.d(TAG_SENSOR,switchPreference.getKey() + "'s status is " + switchPreference.isChecked());
        preferenceCategory.addPreference(switchPreference);
    }
}


public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
{


    SwitchPreference preference = (SwitchPreference) findPreference(key);
    boolean value = preference.isChecked();
    if (value)
    {
        //start tracking this sensor
        Log.d(TAG_SENSOR, key + " tracking enabled");
    }
    else
    {
        //stop tracking this sensor
        Log.d(TAG_SENSOR, key + "tracking disabled");
    }

}

Answer 1

经过一番修补，我发现解决方法是将SwitchPreference的持久值设置为false