Question

我想将数据集存储到从Firestore中提取数据的2D arraylist中。这是数据库代码。

db.collection("Reminder").orderBy("time").get()
            .addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {

                @Override
                public void onSuccess(QuerySnapshot queryDocumentSnapshots) {

                    if (!queryDocumentSnapshots.isEmpty()) {
                        List<DocumentSnapshot> list = queryDocumentSnapshots.getDocuments();

                                for (DocumentSnapshot d : list) {
                                    dbReminder p = d.toObject(dbReminder.class);
                                    p.setId(d.getId());
                                    remtasklist.add(p);
                                    sTime = p.getTime();                                 
                                    sLoc = p.getInLocation();
                                    sTitle = p.getTitle();     
                                    ListofInfo();
                        }
                    }
                }
            });

但是我试图在for循环内执行for循环，它抛出了'java.lang.IndexOutOfBoundsException'，所以我只是这样做了

ArrayList.get(0).add(sTime);
ArrayList.get(0).add(sLoc);
ArrayList.get(0).add(sTitle);

我明白了

I/System.out: [[09:55, Bedroom, drink water, 11:05, Kitchen, Feed the cat, 11:15, Kitchen, Prepare supper, 15:55, Kitchen, Eat book, 16:40, Kitchen, go to store, 17:39, Bedroom, get home]]

我想要的是

[[09:55, Bedroom, drink water], [11:05, Kitchen, Feed the cat], [11:15, Kitchen, Prepare supper], [15:55, Kitchen, Eat book], [16:40, Kitchen, go to store], [17:39, Bedroom, get home]]

我想创建2D数组列表以保留Firebase Firestore中的数据

0 个答案: