title: Data not written to Firebase on button press
body: <p>Ok, so I'm hoping someone can help me with this problem since I've been trying a bunch of different solutions the past several days. Within my activity, I have an EditText and a Button and I'm trying to write that user input to Firebase. I don't get any errors when I run the application, however, when I press the button, nothing happens. </p>
  
  <p>Here's my class: </p>
  
  <pre><code>private EditText userEmail;
  Button sendInviteButton;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      Firebase.setAndroidContext(this);
      setContentView(R.layout.activity_user_registration);
  
      userEmail = (EditText) findViewById(R.id.user_email);
      sendInviteButton = (Button) findViewById(R.id.sendInviteButton);
  
  }
  
  public void btn(View view) {
      sendInviteButton.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              Firebase ref = new Firebase("https://app-1318.firebaseio.com/clients");
              String enteredUserEmail = userEmail.getText().toString();
              ref.child("userBackgroundCheck").setValue(enteredUserEmail);
          }
      });
  }
  </code></pre>
  
  <p>I do have an onClick for the button in XML so I truly have no idea why this data isn't being sent to Firebase. </p>
  
  <p>Lastly, are we supposed to use the root URL for Firebase for this portion?: </p>
  
  <pre><code>Firebase ref = new Firebase("https://app-1318.firebaseio.com/clients");
  </code></pre>
  
  <p>Which would be: </p>
  
  <pre><code>Firebase ref = new Firebase("https://app-1318.firebaseio.com");
  </code></pre>