Twitter4J + Android: Authentication Challenge is Null Exception
问题 I'm using Twitter4J library for OAuth authentication but I get "Authentication Challenge is Null Exception" even before It opens the Twitter login page. Here is the code. Twitter twitter = new TwitterFactory().getInstance(); try { twitter.setOAuthConsumer(Startup.TWITTER_KEY, Startup.TWITTER_SECRET); String callbackURL = "twitter-client:///"; RequestToken rToken = twitter.getOAuthRequestToken(callbackURL); startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(rToken.getAuthenticationURL())))