Android SharedReferences不更新数据

我有活动和服务

活动将数据存储并更新到共享首选项文件中。我正在更新活动中的数据，然后服务尝试检索更改，但他读取了旧值

代码：

保存\更新：

@Override
public void save(VolumeBotSettings settings) {
    SharedPreferences.Editor edit = sharedPreferences.edit();
    edit.putInt(START_HOURS, settings.getStartHours());
    edit.putInt(START_MINUTES, settings.getStartMinutes());
    edit.putInt(END_HOURS, settings.getEndHours());
    edit.putInt(END_MINUTES, settings.getEndMinutes());

    edit.putInt(RING_VOLUME_LEVEL, settings.getRingVolumeLevel());
    edit.putInt(MUSIC_VOLUME_LEVEL, settings.getMusicVolumeLevel());
    edit.putInt(NOTIFICATION_VOLUME_LEVEL, settings.getNotificationVolumeLevel());
    edit.putInt(ALARM_VOLUME_LEVEL, settings.getAlarmVolumeLevel());
    edit.commit();
}

@Override
public VolumeBotSettings retrieve() {
    VolumeBotSettings settings = new VolumeBotSettings();
    settings.setStartHours(sharedPreferences.getInt(START_HOURS, UNDEFINED));
    settings.setEndHours(sharedPreferences.getInt(END_HOURS, UNDEFINED));
    settings.setStartMinutes(sharedPreferences.getInt(START_MINUTES, UNDEFINED));
    settings.setEndMinutes(sharedPreferences.getInt(END_MINUTES, UNDEFINED));

    settings.setRingVolumeLevel(sharedPreferences.getInt(RING_VOLUME_LEVEL, UNDEFINED));
    settings.setMusicVolumeLevel(sharedPreferences.getInt(MUSIC_VOLUME_LEVEL, UNDEFINED));
    settings.setNotificationVolumeLevel(sharedPreferences.getInt(NOTIFICATION_VOLUME_LEVEL, UNDEFINED));
    settings.setAlarmVolumeLevel(sharedPreferences.getInt(ALARM_VOLUME_LEVEL, UNDEFINED));

    if (settings.isNotNull())
        return settings;
    else
        return null;
}

阅读：

@Override
public void save(VolumeBotSettings settings) {
    SharedPreferences.Editor edit = sharedPreferences.edit();
    edit.putInt(START_HOURS, settings.getStartHours());
    edit.putInt(START_MINUTES, settings.getStartMinutes());
    edit.putInt(END_HOURS, settings.getEndHours());
    edit.putInt(END_MINUTES, settings.getEndMinutes());

    edit.putInt(RING_VOLUME_LEVEL, settings.getRingVolumeLevel());
    edit.putInt(MUSIC_VOLUME_LEVEL, settings.getMusicVolumeLevel());
    edit.putInt(NOTIFICATION_VOLUME_LEVEL, settings.getNotificationVolumeLevel());
    edit.putInt(ALARM_VOLUME_LEVEL, settings.getAlarmVolumeLevel());
    edit.commit();
}

@Override
public VolumeBotSettings retrieve() {
    VolumeBotSettings settings = new VolumeBotSettings();
    settings.setStartHours(sharedPreferences.getInt(START_HOURS, UNDEFINED));
    settings.setEndHours(sharedPreferences.getInt(END_HOURS, UNDEFINED));
    settings.setStartMinutes(sharedPreferences.getInt(START_MINUTES, UNDEFINED));
    settings.setEndMinutes(sharedPreferences.getInt(END_MINUTES, UNDEFINED));

    settings.setRingVolumeLevel(sharedPreferences.getInt(RING_VOLUME_LEVEL, UNDEFINED));
    settings.setMusicVolumeLevel(sharedPreferences.getInt(MUSIC_VOLUME_LEVEL, UNDEFINED));
    settings.setNotificationVolumeLevel(sharedPreferences.getInt(NOTIFICATION_VOLUME_LEVEL, UNDEFINED));
    settings.setAlarmVolumeLevel(sharedPreferences.getInt(ALARM_VOLUME_LEVEL, UNDEFINED));

    if (settings.isNotNull())
        return settings;
    else
        return null;
}

在使用共享首选项之前，我还重新初始化了它们

private static final String VOLUME_BOT_PREFERENCES = "volume_bot_preferences";

public void init(Context context) {
    sharedPreferences = context.getSharedPreferences(VOLUME_BOT_PREFERENCES, Context.MODE_PRIVATE);
}

因此，分步行动：

Activity call init() method.
Activity call save() method.
Close Activity. Service is running.
Service call init() method.
Service call retrive() method.

没有更新任何数据。请帮助我了解原因

---

注意。init（）、save（）、retrieve（）-位于同一应用程序中的单音类的方法。
检索的设置不为空

试试看：

public void init(Context context)
{
    sharedPreferences = context.getSharedPreferences(VOLUME_BOT_PREFERENCES, Context.MODE_MULTI_PROCESS);
}

关于此标志：

设置后，即使在此过程中已加载共享首选项实例，也会检查磁盘上的文件是否有修改

---

我很久以前就有过这个问题：

---

最后的答案是，由于它跨越两个独立的进程，因此必须设置标志

Context.MODE\u MULTI\u PROCESS

。SharedReferences在应用程序的本地内存中缓存映射，因此默认情况下，内存不会在进程之间共享。这是在2.3中实现的。如果支持的数据少于此值，我不相信您可以使用此方法。

您是否使用相同的

SharedReferences

来保存和检索数据？@Aashish我希望是<代码>音量机器人首选项是一个常量值。它定义了sp文件名。服务是否在单独的进程上运行？设置SharedReference时，需要使用

上下文.MODE\u MULTI\u进程

。对不起，@DeeV首先在评论中回答了。（坦白地说）没什么私事）没问题，我没有看到他的评论；）自API 23以来，不推荐使用模式\u多\u进程。