Firebase get last child added android. keys) { // Firebase ChildEventListener OnChildAdded doesnt read the last child? Asked 8 years, 4 months ago Modified 8 years, 4 months ago Viewed 316 times Although the limit method is pretty good and efficient, but you still need to add a check to the child_added for the last item that will be grabbed. g. For this I created the following db in Firebase: All dates are in format YYYYMMDD. I want to convert all Firebase DataSnapshot children to a list in android. I have found things like Firebase retrieve child Android. You can see on the image below i'm not sure how to get the specific node, because unique key is created by Firebase. T How to get the last data from realtime database of firebase in Android Asked 6 years, 7 months ago Modified 5 years, 10 months ago Viewed 1k times Firebase for Android, How can I loop through a child (for each child = x do y) Asked 9 years, 3 months ago Modified 5 years ago Viewed 41k times The relative path can either be a simple child key (e. For details, see the FAQ about this initiative. Aug 23, 2018 · My question is how do I retrieve the last child from "Ranklist"? I tried to orderByKey ByValue but nothing works in my case. I think I need to use childevent listener but I don't know how to redirect it correctly. i am trying to get reference or snapshot of newly added child on firebase i have solve it by different way myRef. addValueEventListener(new ValueEventListener Everytime I load my list of items I realized that the child_added event is called, but why? Wasn't this event supposed to be called only when a new child is added to the database? I have this model below in Firebase I am trying to get all the values from child node posts using below code databasePostsReference = FirebaseDatabase. I expect that more children will be added over the next few minutes. Here is the code. If the child location has no data, an empty DataSnapshot is returned. Jul 23, 2025 · Step 1: Create a new project and Connect to Firebase app Refer to Adding firebase to android app and follow the steps to connect firebase to your project. 3 days ago · A guide to retrieving data from the Firebase Realtime Database using the Admin SDK, covering both asynchronous listeners and blocking reads, as well as how to query and order your data. child(getUserDetails(). I have the following database structure in Firebase: I would like to retrieve the value for the key "name" (which in this case would be "b"). Clearly Google How to get child of child value from firebase in android || Retrieving data from firebase Oghenemano Omogha 143 subscribers Subscribe. If you use KTX APIs from the previously released KTX modules, we recommend that you migrate your app to use KTX APIs from the main modules instead. limitToLast(1); A simple getting started guide to Firebase Database, a NoSQL database with a rich client side API. As items change, we will receive child_removed events for each item that drops out of the active list so that the total number stays at 100. getInstance() val userIdReferenc I have this structure in my Firebase Real-time database : How can I count the data and show it in my app, which listener shall I use to get all childrens? A guide to getting data from Cloud Firestore, including how to read documents and collections. food is an array that can contain one or more elements. 0. child(rID) you will get a OnChildAdded for each userId, what is pretty usefull like for example fill a RecyclerView or a ListView being able to update each item individually together with your Firebase Data. Jul 10, 2024 · In conclusion, looping through child nodes in Firebase on Android using a ValueEventListener offers a flexible and efficient way to interact with your database. So However, there is no way (to my knowledge) to tell the last time the child_added callback has been called, thus I can't accurately run my own callback after the the last child has been added to my array. Its giving error. I want to ask if there is any function or query available to get last added child. setText(datumStr) overwrites all previous results. By structuring your code properly, handling callbacks effectively, and considering best practices, you can leverage Firebase to build robust and responsive applications. A guide to reading and writing data in the Firebase Realtime Database for your Android app, including how to listen for changes, update or delete data, and perform transactions. Better if you listen parent node to listen all childs one, two, three, etc. And When ever another user adds a node that is a child node under the parent node "plans", The other users should be able to swipe and the only child node added is shown with the other 5. All the solutions are suggesting using a "ChildEventList I am trying to get last added child in cloud function. makeUppercase = For my Firebase cloud functions, i'am trying to get the last child item added, in the aim to proceed a task for this item. I want to fetch multiple child's last item's data for only once. Here is my code: exports. A guide to working with lists of data in the Firebase Realtime Database for your Android app, including how to append, sort, and filter data, and how to listen for changes to the list. This is my database structure: Users - Uid - online : true i want to get list of users which are online without ne Below code has given me all child in Firebase by a forEach loop: final Query query = mDataBaseReference_info_channels. I have a list view to retrieve the data from firebase realtime database. put("Best Players", players); is wrong, because players is an ArrayList and not a Map. The addUser method is functional properly but during the update method it replace the old data. child("channels"); Get Last Item in nested database firebase android Asked 7 years, 9 months ago Modified 7 years, 9 months ago Viewed 2k times I'm trying to retrive the data of the last-child in my Firebase Database. I understand that you will have to modify the code in th orderbychild firebase, firebase get value of child android, firebase get data by key android, firebase get all child keys android, A short simple guide to using Firebase’s RealTime NoSQL database from your Android app using Kotlin. 2 Supposing I have a Firebase Database location, /foo, which has five children under it right now. A couple of solutions I can see working is by hacking a delay timer on the last child added event (say 0. So I’ll try to explain in this article, three ways in which we can get data from Firebase Realtime Database using this new modern added get () method. I am having a similar issue in which I have my files as follow in which I want to be able to view all child items and add new child items. If you use addChildEventListener for different locations, to see from which location the child has been added you need to check the dataSnapshot from onChildAdded method using getRef method like this: The following methods are used to add and update the firebase database. Attach the listener to a location using addChildEventListener and the appropriate method will be triggered when changes occur. getInstance(). getReference(). Imagine your first screen is a list of the chat rooms which contains basic info like title, last message, timestamp. In your case, a new child is added because you are using a wrong reference. Please tell me where to correct As shown in the image below, I have a database "table" called fridge that has a child called food. child("post So I want to add the most recent child to the top of this database, is it possible with any Algorithm or Firebase methods? This is the code to add the data to the firebase After getting the whole list from Firebase iterate them one by one to add them in the list, after the loop set them in the adapter of RecyclerView, and set the adapter to your desired RecyclerView Please change to mode in which you add data to your Firebase database. Actually i want to get online users only not the whole list of users. However, a common pain point for developers is that `child_added` **also fires for all existing children** when the One common problem developers face is how to retrieve the last child from a Firebase database, especially when dealing with multiple related data tables. However, if we have over 100 messages, we will only receive a child_added event for the last 100 ordered messages. A guide to working with lists of data in the Firebase Realtime Database for your Flutter app, including how to append, sort, and filter data, and how to listen for changes to the list. The Firebase Database Api focuses on the powerful realtime features of NoSQL. I'm having issues because addChildEventListener onChild IMPORTANT: In July 2025, we stopped releasing new versions of KTX modules, and we removed the KTX libraries from the Firebase Android BoM (v34. But the problem is I want to show the last added data on the top of the listviewIts a notice board type project so, I wan I'm building a small app that manages dates in Android Studio. I tried this: myRefVal=databaseBook. Step 2: Add Realtime Database to you app in Console - Go to Firebase console and navigate to your project, and on the left side of the screen, under Build choose Realtime Database. We’ve seen how to create and retrieve data from our Firebase database using some simple code to How would I do to add a child to existing data in a Firebase database through an Android application? Here is what my Firebase database looks like: I want to be able to save data as children to the How do I get the last ID entered in Realtime? I have something like that, and I need the ID of the last record entered in license plates. I have been looking for a way to get one child object's data in Android Firebase. I want to retrieve data for a specific child, how I can write the code? I try a lot, but it did not work:" ( [ like in my database here how to get the tasks for specific child like lubna and gets all it's child? Is there any way to get the index of a child of a Firebase in Android? Unfortunately I do not have 10 reputation so I'll post my picture here: http://gyazo. public String buscaMatricula(){ DatabaseReference So the last idea is that when a user opens the activity "AfterLogin" the onStart () method runs and it shows all the child nodes under the parent node "plans". You can see on the image below. I want to access location details from the last added node in Firebase database. It is better if you register a child event listener for /chats/ node. To retrieve the last child (or the most recent child) from a Firebase Realtime Database in Android, you can use a query to order the data by a timestamp or any other suitable criterion and limit the result to one item. So you can get a list of all chat items. What I would like to do is to add another Records child, that is called like the last-child id-number, increased by 1. I have a child event listener on this database reference and I'm getting five calls back to onChildAdded() immediately when I add the listener as expected. I am following below approach : for (roomId in roomInformation. getReference("books"); Query lastQuery = myRefVal. Some code: list I want to get item in the last node added in firebase database from my Android. Also I don't know if it's still the case, but you might get "old" events from previously deleted items, so you might need to watch at for this too. I wish to retrieve the first and last child's keys For example if you attach an OnChildEventListener to mReference. From the Firebase API: Child Added: This event will be triggered once for each initial child at this location, and it will be triggered again every time a new child is added. getUserId()). below is my database json structure { message{ "id"=10; "name"="xyz" } } public void onChildAdded( I want to get the last key of the book node and incremented by a his value++. com How to handle onChildAdded event in firebase android. A guide to working with lists of data in the Firebase Realtime Database for your web app, including how to append, sort, and filter data, and how to listen for changes to the list. I have this type of structure in my firebase real time db. When child locations are added, removed, changed, or moved, the listener will be triggered for the appropriate event I could not figure out how to point my value listener to every child's last node as shown in this picture. 'fred/name/first'). Something like this: mFirebaseRef = new Firebase(FIREBASE_URL); mFirebaseRef. map. One of its most commonly used event listeners is `child_added`, which triggers when a new child is added to a specified database reference. addValueEventListener(new ValueEventListener() { @Overrid I'm trying to setup an Android Service in my app that listens for new Childs in a Firebase Ref, and throws a Notification when that happens. I want to get just color item in the image from all user in my database. datum. 'fred') or a deeper slash-separated path (e. 0). I try this private fun setListPersonOfferService(){ val database = FirebaseDatabase. 3 seconds) and then handle the quick sessions of events into a single event myself. Classes implementing this interface can be used to receive events about changes in the child locations of a given DatabaseReference ref. I want to access the last node and fetch the "it's only getting the very last child of results" More likely it is getting all results, but only show the last one in the holder because holder. My structure is like this: -Tips -TipsId -Safe Add a listener for child events occurring at this location. I have knowledge of the key -K_bWdgeYxYrdmzr67bJ. As you can see, the child is added in the wrong place because your don't use the taskId in your code. Dec 2, 2025 · Firebase Realtime Database is a powerful tool for building real-time applications, enabling seamless data synchronization across clients. I don't get any errors, I think I simply don't get any data from this query. . pwklp6, nzug7, k80vg, y2wc, jicvb, n4mi, 3ryz6, 7vdv0, qets, 8nzn,