Firebase data retrieive with random keys

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I have a firebase data structure for my android app and I want to retrieve the data from random keys generated by push() method which is child of Forum node which is a child of root of the database. Please suggest me a way to do this. Thanks.

You can get all of the children nodes of the parent "Forum" node. Just use getChildren() method. Then just randomly select one of the child node at position index.

DataSnapshot snapshot = dataSnapshot.child("Forums");
Iterable<DataSnapshot> children = snapshot.getChildren();

for (DataSnapshot child: children) {
        Object obj = child.getValue(Object.class);
}

Generate a Firebase Server Key, indexOn rule for more information. Filtering by key. We can also filter nodes by their keys using the orderBy="$key" parameter. The  You can use public Iterator<String> keys() Returns an iterator of the String names in this object. The returned iterator supports remove, which will remove the corresponding mapping from this object. If this object is modified after the iterator is returned, the iterator's behavior is undefined. The order of the keys is undefined. Example:

To display the values of all the children under Forums node, please use the following code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference forumsRef = rootRef.child("Forums");
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String name = ds.child("name").getValue(String.class);
            String ques = ds.child("ques").getValue(String.class);
            String title = ds.child("title").getValue(String.class);
            String uid = ds.child("uid").getValue(String.class);
            Log.d("TAG", name + " / " + ques + " / " + title + " / " + uid);
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
forumsRef.addListenerForSingleValueEvent(valueEventListener);

Retrieving Data, You can use these auto-generated keys to simplify flattening your data structure. the Realtime Database Query class to retrieve data sorted by key, by value,  The JSON-encoded data will be an object with two keys: path and data The path points to a location relative to the request URL For each key in the data, the client should replace the corresponding key in its cache with the data for that key in the message: keep-alive: The data for this event is null, no action is required: cancel

first you should write your class model "FormusModel" to store the data from server you can use this

  >   > 

rootRef.child("Forums").addChildEventListener(new
    > ChildEventListener() {
    >     >                 @Override
    >     >                 public void onChildAdded(DataSnapshot dataSnapshot, String s) {
    >     >                     ForumsModel model = dataSnapshot.getValue(FormusModel.class);
//now you can use model.getname();.... 
    >     }

Note: you must implemnt another method like onChildCahnge listener

Work with Lists of Data on Android, Random Key - Android Firebase Tutorial - Full Backend Course (Part - 10) This course is Duration: 3:50 Posted: Jan 25, 2017 Get data with Cloud Firestore. There are two ways to retrieve data stored in Cloud Firestore. Either of these methods can be used with documents, collections of documents, or the results of queries: Call a method to get the data. Set a listener to receive data-change events.

Random Key - Android Firebase Tutorial, Hence, it is the basic idea and the approach on about, “How to Sort” and hence, “​Filter” the data to retrieve the “Child Key Values” from the “Firebase Database”  To solve this, the Firebase clients provide a push () function that generates a unique key for each new child. By using unique child keys, several clients can add children to the same location at the same time without worrying about write conflicts.

How to read all child key values of a child from Firebase database in , The key elements of Firebase database list handling are the push() method, the Query class, child and value event listeners and a range of filtering options. Random Key - Android Firebase Tutorial - Full Backend Course (Part - 10) TVAC Studio. How to retrieve data from Firebase in Android || Retrieve data from firebase |

Working with Firebase Realtime Database Lists, I've fetch many user data as a list and build a listview. i apply 'Order by key' or '​order by child' , the list stays same as before (random order). Step 1 : Start with a basic rules file, which includes empty rules for stories and comments: Step 2 : Add a simple write rule that gives owners complete control over stories. Step 3 : Write rules that allow a user of any role to read stories and comments. Step 4 : Allow story writers, commenters,

Comments
  • I want to retrieve the name, ques, title and UID from every child of the forum node and then store them in a recycler or list view, kind of a timeline in social networking sites like Instagram and Facebook etc. Any ideas?
  • Firebase has its own recyclerview implementation. Check this link: github.com/firebase/FirebaseUI-Android/blob/master/database/…
  • and you can do what you are saying by just using the code that I provided as well. You will have to work on it a bit
  • I don't know the forums id, it's created by the push() method which is unique everytime, it's randomly generated key