Getting the list of child in firebase android

Question

Check the Image of my firebase database

Please click first the link to see the image. How can I get the KjfLmUnPUaWeYDETp04 and PlamHmUnPUaWeYDETp04 and insert it in the List<String> in android. Thank you in advance.

  mFirebaseInstance.getReference("users").addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {

                }

                @Override
                public void onCancelled(DatabaseError error) {

                }
            });

Answer 1

mFirebaseInstance.getReference("users").addValueEventListener(new 
ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
              for(DataSnapshot dst : dataSnapshot.getChildren()){
               //Key stores KjfLmUnPUaWeYDETp04 and PlamHmUnPUaWeYDETp04
                String key = dst.getKey();

              }
            }

            @Override
            public void onCancelled(DatabaseError error) {

            }
        });