Check If A Value Exits In Firebase

This is my Customer's Node customers { '-KXKCee0yVJE1z1gCQcV' : { 'cust_id' : '-KXKCee0yVJE1z1gCQcV', 'email' : “xxx@xxx.com', 'food_pref' : 'nonveg', 'name' : “Jind', 'notes

Solution 1:

You should use addListenerForSingleValueEvent.

The ChildEventListener will be invoked only if the child exists. If it doesn't, nothing will happen.

The ValueEventListener will always be invoked and you can call the snapshot's exists() method to check for existence.