如何返回DocumentSnapSpot作為方法的結(jié)果？一個自定義對象，其參數(shù)為(DocumentSnapSpot文檔管理單元)。也是Firebase中的一個內(nèi)部對象，它檢索快照并將值設(shè)置為我的自定義模型，也有它的參數(shù)(DocumentSnapSpot文檔管理Spot)。但是，我希望從Firebase獲取數(shù)據(jù)并將其傳遞給我的自定義參數(shù)，因為我的數(shù)據(jù)不僅僅是Firebase，而是多個數(shù)據(jù)。而且不可能在沒有覆蓋的情況下迭代FiRESTORE。下面是代碼：public UserSettings getUserSettings(DocumentSnapshot documentSnapshot){     Log.d(TAG, "getUserSettings: retrieving user account settings from firestore");     DocumentReference mSettings = mFirebaseFirestore.collection("user_account_settings").document(userID);     mSettings.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {         @Override         public void onSuccess(DocumentSnapshot documentSnapshot) {             UserAccountSettings settings = documentSnapshot.toObject(UserAccountSettings.class);             settings.setDisplay_name(documentSnapshot.getString("display_name"));             settings.setUsername(documentSnapshot.getString("username"));             settings.setWebsite(documentSnapshot.getString("website"));             settings.setProfile_photo(documentSnapshot.getString("profile_photo"));             settings.setPosts(documentSnapshot.getLong("posts"));             settings.setFollowers(documentSnapshot.getLong("followers"));             settings.setFollowing(documentSnapshot.getLong("following"));         }     });}