Facebook - “Cannot query users by their username” solution

问题

I am developing an android app. I was using a HttpURLConnection to get profile pictures of facebook users. The URL looks like this:

http://graph.facebook.com/?ids=username1,username2,username3&fields=picture&type=square

But now, since v2.2 doesn\'t let me to get profile pictures of users who are not using my facebook app, it throws an error:

{ \"error\": {

  \"message\": \"(#803) Cannot query users by their username (username1)\",
  \"type\": \"OAuthException\",
  \"code\": 803    } }

I am not interested in using \"Facebook SDK for Android\". Let\'s say I use a pop-up webview to authorize my facebook app. What url would let me do the same thing? Is there a simple solution like this:

graph.facebook.com/?app=APP-ID&ids=username1,username2&fields=picture

回答1:

Since v2.0 of the API, you are not supposed to use usernames at all - and that´s why you can´t query users by their username anymore. The only way to get access to data of a user is by authorizing that user and using the /me endpoint.

Main rule: Forget about users who did not authorize your App, you are not supposed to get any data of those for privacy reason.

来源：https://stackoverflow.com/questions/30886468/facebook-cannot-query-users-by-their-username-solution