import android.preference.Preference; //导入方法依赖的package包/类

@Override

public boolean onPreferenceChange(Preference preference, Object value) {

String stringValue = value.toString();

if (preference instanceof ListPreference) {

// For list preferences, look up the correct display value in

// the preference's 'entries' list.

ListPreference listPreference = (ListPreference) preference;

int index = listPreference.findIndexOfValue(stringValue);

String title = index >= 0 ? String.valueOf(listPreference.getEntries()[index]) : "";

//Exibir o tempo total de funcionamento do registrador depois do ultimo reset.

if (OhaEnergyUseSyncHelper.ENERGY_USE_SYNC_OFTEN_LOGGER_RESET.equals(preference.getKey())){

Context context = preference.getContext();

long durationLoggerRunning = preference.getSharedPreferences().getLong(OhaEnergyUseSyncHelper.ENERGY_USE_SYNC_DURATION_LOGGER_RUNNING,0);

preference.setTitle(String.format(context.getString(R.string.pref_title_energy_use_sync_often_logger_reset), title));

preference.setSummary(String.format(context.getString(R.string.pref_summary_energy_use_sync_often_logger_reset), OhaHelper.convertMillisToHours(durationLoggerRunning)));

} else {

// Set the summary to reflect the new value.

preference.setSummary(title);

}

} else if (preference instanceof RingtonePreference) {

// For ringtone preferences, look up the correct display value

// using RingtoneManager.

if (!TextUtils.isEmpty(stringValue)) {

Ringtone ringtone = RingtoneManager.getRingtone(

preference.getContext(), Uri.parse(stringValue));

if (ringtone == null) {

// Clear the summary if there was a lookup error.

preference.setSummary(null);

} else {

// Set the summary to reflect the new ringtone display

// name.

String name = ringtone.getTitle(preference.getContext());

preference.setSummary(name);

}

}

} else {

// For all other preferences, set the summary to the value's

// simple string representation.

preference.setSummary(stringValue);

}

return true;

}