Remove Specific value From Firebase Database

Question

I want to Delete Specific value from Firebase Database following is Database which i have stored

Now, I want to Delete Fol

Answer 1

Instead of using addListenerForSingleValueEventtry using addChildEventListener as below,

Query queryRef = mReference.child("demo").orderByChild("fname").equalTo("John");

queryRef.addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(DataSnapshot snapshot, String previousChild) {
      snapshot.getRef().setValue(null);
    }
});