Ability子系统之数据观察者服务-dataobsmgr 原创

@Override
public void onStart(Intent intent) {
    // ...
    dataAbilityHelper = DataAbilityHelper.creator(this);
    IDataAbilityObserver dataAbilityObserver = new IDataAbilityObserver() {
        @Override    
        public void onChange() {
            String timeFormat = SystemSettings.getValue(dataAbilityHelper, SystemSettings.Date.TIME_FORMAT);
            setTimeFormat(timeFormat);
        }
    };
    dataAbilityHelper.registerObserver(SystemSettings.getUri(SystemSettings.Date.TIME_FORMAT), dataAbilityObserver);
}

void setTimeFormat(String timeFormat) {
    String timeStr = "12";
    if (timeStr.equals(timeFormat)) {        
        // Display in 12-hour format
    } else {
        // Display in 24-hour format
    }
}
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int* DataObsMgrInner::HandleNotifyChange(*const* Uri *&**uri*)
{
  HILOG_INFO("DataObsMgrInner::HandleNotifyChange called start");
  std::lock_guard<std::mutex> *lock_l*(**innerMutex_**);
  ObsListType *obslist*;
  if (!GetObsListFromMap(*uri*, *obslist*)) {
    AtomicSubTaskCount();
    HILOG_INFO("DataObsMgrInner::HandleNotifyChange there is no obs in the uri.");
    return NO_OBS_FOR_URI;
  }

  for (*auto* *obs* : *obslist*) {
    if (*obs* != nullptr) {
      *obs*->OnChange();
    }
  }

  AtomicSubTaskCount();
  HILOG_INFO("DataObsMgrInner::HandleNotifyChange called end %{public}zu", *obslist*.size());
  return NO_ERROR;
}
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