How to get nested Child from Firebase Database Using Android?

Question

I want to get list of all Allowed child from this type of JSON Tree:

databaseRef.child(\'Users\').child(\'Allowded\').addValueEventListener(new ValueEventLis         


        

Answer 1

Firebase listeners fire for both the initial data and any changes.

If you're looking to synchronize the data in a collection, use ChildEventListener. If you're looking to synchronize a single object, use ValueEventListener. Note that in both cases you're not "getting" the data. You're synchronizing it, which means that the callback may be invoked multiple times: for the initial data and whenever the data gets updated.

FirebaseRef.child("message").addValueEventListener(new ValueEventListener() {
 @Override
public void onDataChange(DataSnapshot snapshot) {
  System.out.println(snapshot.getValue());  //prints "Do you have data? You'll 
    love Firebase."
 }
@Override
 public void onCancelled(DatabaseError databaseError) {        
}
 });