Android/Java:如何获取新OneSignal 4.0.0中的userId？(idsAvailable已弃用，getPermissionSubscriptionState不起作用)

import com.onesignal.OneSignal;
import com.onesignal.OSPermissionSubscriptionState;
import com.onesignal.OneSignal.OSPermissionSubscriptionStateChanges;
import com.onesignal.OneSignal.IdsAvailableHandler;

// ...

OneSignal.idsAvailable(new IdsAvailableHandler() {
    @Override
    public void idsAvailable(String userId, String registrationId) {
        // 在这里处理userId
        if (userId != null) {
            // 打印userId
            Log.d("OneSignal", "User ID: " + userId);
        }
    }
});