title: Where is the request code constant (64206) for login defined in Facebook SDK
body: <p>I am using Facebook SDK (4.*) on Android.
  Just implemented programmatically login (without using "LoginButton") using <code>LoginManager</code>'s <code>logInWithReadPermissions()</code>. In order for callback to work I need to call <code>FacebookCallbackManager.onActivityResult(requestCode, resultCode, data);</code> which I do in my activity's <code>onActivityResult</code> method. </p>
  
  <p>However, my <code>onActivityResult</code> handles results form several returning activities and it checks the <code>requestCode</code> to see which activity returned. I see that facebook login returns with 64206 but I am unable to find where that constant is defined. I don't want to hardcode 64206 and I was wondering: does someone knows where is this result code defined in the Facebook SDK (and is it public)?</p>