Question

我想从云Firestore获取地图数据，这是Java代码，我需要快速访问同一数据库。我附上了Java代码和数据库结构图片以供参考。

FirebaseFirestore db = FirebaseFirestore.getInstance();
    DocumentReference mDocRef = db.collection("hmdhAcademy").document("notifications");

    mDocRef.get().addOnCompleteListener(task -> {

        if ( task.isSuccessful() ) {

            DocumentSnapshot documentSnapshot = task.getResult();

            if ( documentSnapshot != null && documentSnapshot.exists() ){

                notificationList = (ArrayList) documentSnapshot.get("userNotifications");
                adapter = new NotificationAdapter(this,notificationList);
                mRecyclerView.setAdapter(adapter);
                alertDialog.dismiss();
            }
        }
        else {

            Toast.makeText(NotificationActivity.this,"Check Internet Connection",Toast.LENGTH_SHORT).show();
            alertDialog.dismiss();
        }

    });

if ( list.get(i) instanceof  HashMap ){

        final Intent intent = new Intent(mContext,NotificationDetail.class);

        String title = (String)((HashMap)list.get((list.size()-1)-i)).get("title");
        String body = (String)((HashMap)list.get((list.size()-1)-i)).get("body");
        String image = (String)((HashMap)list.get((list.size()-1)-i)).get("notiImage");
        String detail = (String)((HashMap)list.get((list.size()-1)-i)).get("detail");
}

我需要相同的标题，正文，notiImage和详细信息。

请帮助我，我在任何地方都在寻找答案，但失败了。

Answer 1

尝试此代码：

docRef.getDocument { (document, error) in
if let document = document, document.exists {
    print(document.data()!)
    let userNotifications = document.data()["userNotifications"] as? [[String:Any]]
    for notificaton in userNotifications  {
        let body = notificaton["body"] as? String ?? ""
        let title = notificaton["title"] as? String ?? ""
        print(body, title)

    }

} else {
    print("Document does not exist")
}
}

或尝试这种方式：

创建结构

struct usernotifcatons {

var body: String = ""
var detail: String = ""
var notiImage: String = ""
var title: String = ""


init(notificationData: [String:Any]) {

let body = notificationData["body"] as? String ?? ""
self.body = body

let detail = notificationData["detail"] as? String ?? ""
self.detail = detail

let notiImage = notificationData["notiImage"] as? String ?? ""
self.notiImage = notiImage

let title = notificationData["title"] as? String ?? ""
self.title = title
 }

}

在ViewController中创建一个变量：

var allNotifications: [usernotifcatons] = [usernotifcatons]()

将所有数据映射到您的Firestore代码中的一行中

docRef.getDocument { (document, error) in
if let document = document, document.exists {
print(document.data()!)
let userNotifications = document.data()?["userNotifications"] as? [[String:Any]]
for data in userNotifications! {
            self.allNotifications.append(usernotifications(notificationData: data))
        }
print(self.allNotifications)

  } else {
print("Document does not exist")
 }
}

从Cloud Firestore获取地图数据

1 个答案: