Firebase - random query

Question

I am making and application that show a first screen with a bunch of randomly picked data from a node in Firebase database.

To present user with different data every

Answer 1

There is no direct way provided by firebase database but you can do this using Collections.shuffle()

What i did was,Take the snapshot and store it in an arraylist.

 private ArrayList array=new ArrayList<>();

    public void onDataChange(DataSnapshot dataSnapshot) {
                        for (DataSnapshot imageSnapshot : dataSnapshot.getChildren()) {
                           MyClass myclass = imageSnapshot.getValue(MyClass.class);
                           array.add(myclass.someFunction());
                        }
}

Then call the shuffle method on this array list.

Collections.shuffle(array); // randomize the arraylist

Now you can do whatever you want with this randomized arraylist.