[Android] Example of Fabric Twitter.logIn method?



How would I go about using the Twitter.logIn (Javadocs info: https://docs.fabric.io/javadocs/twitter/2.3.2/index.html method to allow a User to log into Twitter while the User is already using the app as a Guest or perhaps they just logged out of their Twitter account and want to log back in. I dont want to send them back to the login page (AKA the login activity example found on the Fabric website)

Lets say for example I have an Activity called Tweet_Fragments.java that displays a list of Tweets.
And in the ActionMenu I have a “Login” Button because the User is in Guest-Mode or User just Logged out of their Twitter Account and would now like to log back in.
So say I have a piece of code in my Activity such as

if (id == R.id.tw_login_button){
            Twitter.logIn(Tweet_Fragments.this, new Callback<TwitterSession>() {
                public void success(Result<TwitterSession> result) {
                    final Intent intent = new Intent(this, Tweet_Fragments.class);

                public void failure(TwitterException exception) {
                    Toast.makeText(this, "Failed to login to Twitter", Toast.LENGTH_LONG).show();


This line

(this, Tweet_Fragments.class)

Throws the Error:
Cannot resolve constructor 'Intent(anonymous com.twitter.sdk.android.core.Callback<com.twitter.sdk.android.core.TwitterSession>, java.lang.Class<com.example.android.project.Tweet_Fragments>)'

And this line
(this, "Failed to login to Twitter", Toast.LENGTH_LONG)
Throws the Error
Cannot resolve method 'makeText(anonymous com.twitter.sdk.android.core.Callback<com.twitter.sdk.android.core.TwitterSession>, java.lang.String, int)'

Are there any code examples the Twitter Developers can share on using the Twitter.logIn method?