firebase-realtime-database

问题 This is my firebase realtime database : users company: "Indifair" image location: "Bangalore" name: "Anupam Singh" name_title_company_location: "Anupam Singh_Engineer_Indifair_Bangalore" number: 956156494 title: "Engineer" This is my code : DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference(); EditText t1 = (EditText) findViewById(R.id.editText10); EditText t2 = (EditText) findViewById(R.id.editText11); EditText t3 = (EditText) findViewById(R.id.editText13); EditText t4

问题 This is my firebase realtime database : users company: "Indifair" image location: "Bangalore" name: "Anupam Singh" name_title_company_location: "Anupam Singh_Engineer_Indifair_Bangalore" number: 956156494 title: "Engineer" This is my code : DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference(); EditText t1 = (EditText) findViewById(R.id.editText10); EditText t2 = (EditText) findViewById(R.id.editText11); EditText t3 = (EditText) findViewById(R.id.editText13); EditText t4

问题 In my web app, there are 2 types of user: Teacher and Student A Teacher can create virtual classrooms and view the students who joined his/her rooms. While Student can join a classroom and should be able to see the classroom he/she joined to. These codes allow the Teacher to create a classroom: function classcreation(q) { var checkcn = document.getElementById('classroomName').value; if(checkcn == "" && checkcn == null){ alert("Empty Class Name!!"); } else { var usuid = generateId(); var

问题 Okay, so I am building an app that will go on the play store, it has the facility to add data to the Firebase (it cannot read it). Second app will remain with me, (it wont go on the play store) and it is used to read the data. Now what I did was, lets say the first app has package name : com.example.write and the second has com.example.read . So I went to Firebase, created a project, added an application using the package name com.example.write and setup my first app. Working perfectly, I

问题 The variable num changes to what I want inside the observeSingleEvent, but just after it changes back to an empty value. How do i get the value of num to change?? var num = Int() FIRDatabase.database().reference().child("menus/Day1").observeSingleEvent(of: .value, with: {(snap) in print(snap) if let snapDict = snap.value as? [String:AnyObject]{ self.num = snapDict["date"] as! Int print(num) //returns the number I want } }) print(num) //Returns an empty value if num == 5 { print("number is 5")

问题 I want that every time that chat is modified from the firebase database this function is activated "sendNotification" but this error appears: sendNotification ReferenceError: receiverId is not defined at exports.sendNotification.functions.database.ref.onWrite.event (/user_code/index.js:11:29) at cloudFunctionNewSignature (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:105:23) at cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:135:20) at /var

问题 I am doing a project on a food ordering app. Here,I have added a feature like an user can view their order on nav_order section. But when i click on this section, it can't see any kind of data but blank on cart. Here is my order_layout.xml <?xml version="1.0" encoding="utf-8"?> <androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content"

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 days ago . I have a Firebase database setup, and a Python script using the pyrebase module that reads a "timer" variable, and a "cancel" variable. The Python script consists mostly of just a while loop that counts down from 10. However, I need the loop to check for the "cancel" variable to change more than

问题 This question already has an answer here : Firebase List Adapter Constructor error (1 answer) Closed 2 years ago . I am following this tutorial to create a chat app. This is my displayChatMessages() method: ListView listOfMessages = (ListView)findViewById(R.id.list_of_messages); adapter = new FirebaseListAdapter<ChatMessages>(this, ChatMessages.class, R.layout.message, FirebaseDatabase.getInstance().getReference()) { @Override protected void populateView(View v, ChatMessages model, int

问题 Here is my data tree: "look-twopointo": { "0" { "comment": "Hi" "Text1": "Hello" "Text2": "Bonsoir" "type": "Bonjour" "version": "4.0.6" } } For some reason querying doesn't work. button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { mDatabase = FirebaseDatabase.getInstance().getReference().child("0");// pay attention to the this path reference // Read from the database Query query = mDatabase.child("version")/*.orderByChild("Text1")*/.equalTo("4.0.6")/*.startAt