title: Firebase get key string of a push
body: <p>I am doing a push action with setValue.</p>
  
  <pre><code>mFirebaseDatabaseReference.child("loccheck").push().setValue(cloc);
  </code></pre>
  
  <p>How do I retrieve the unique string created?
  P.S. I know how to do it with a push without setValue:</p>
  
  <pre><code>String key = mDatabase.child("posts").push().getKey();
  </code></pre>