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I am working on an Android app, where I need to get a random object from firebase from a child? How to do it in java?

Frank van Puffelen
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Él Díábló Ábhí
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1 Answers1

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This is how I would do it, assuming I had a child with n objects:

If I didn't know how the value of n, I would first do this in my listener to get the total number of objects:

                long n = dataSnapshot.getChildrenCount();

Then I would generate a random integer, i, between 0 and n. If you don't know how to do this, Google it.

Finally, I would get the ith item from the child: 

            final ArrayList<MyObject> objects = new ArrayList<>();
            for (DataSnapshot child : children) {
                MyObject object = child.getValue(MyObject.class);
                objects.add(object);
            }
            MyObject objectToUse = objects.get(i);

"MyObject" should obviously be whatever class you're using.

Am I missing something? Is there a better way to do this? I'm pretty new to Android and very new to Firebase so take what I have to say with a big grain of salt haha.

Elizabeth
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