Develop Reference

How can I get a Twitter public timeline with no user authentication using Twitter4j?

I've wrote some code to allow a user to login to his Twitter account and send Tweet using Twitter4j and following this tutorial.
Now I can also get the tweets of a public account using
ConfigurationBuilder cb = new ConfigurationBuilder();
cb.setHttpConnectionTimeout(10000)
.setHttpReadTimeout(10000)
.setOAuthConsumerKey(Config.TWITTER_CONSUMER_KEY)
.setOAuthConsumerSecret(Config.TWITTER_CONSUMER_SECRET)
.setOAuthAccessToken(Utils.getPrefsString(getActivity(),
TwitterPrefsFragment.PREF_KEY_OAUTH_TOKEN, "")) // empty if not authentified
.setOAuthAccessTokenSecret(Utils.getPrefsString(getActivity(),
TwitterPrefsFragment.PREF_KEY_OAUTH_SECRET, "")); // empty if not authentified
TwitterFactory tf = new TwitterFactory(cb.build());
Twitter twitter = tf.getInstance();
List<twitter4j.Status> statuses = twitter.getUserTimeline(SOME_PUBLIC_TWITTER_ACCOUNT, new Paging(1, 50));
but this only works when the user is authenticated and the app has the oauth token and secret in the preferences..
How can I get a Twitter public timeline with no Access Token, i.e. without having the user to authenticate?
EDIT
I'm reformulating my question to make it clearer:
I managed to authenticate my Twitter app and a user with the code given here.
Now, if the user is not logged in, how can I get a public timeline? In that case, there is no OAUTH_TOKEN and OAUTH_SECRET, and the request shown above does not work because an empty string is set to ConfigurationBuilder.setOAuthAccessToken and ConfigurationBuilder.setOAuthAccessTokenSecret.
So what is, if it exists, the request to get a public timeline, with no OAUTH_TOKEN and OAUTH_SECRET?

In your case, you should use Application-only authentication.
To do this with Twitter4J, try the following code
ConfigurationBuilder cb = new ConfigurationBuilder();
cb
.setOAuthConsumerKey(<YOUR_CONSUMER_KEY>)
.setOAuthConsumerSecret(<YOUR_CONSUMER_SECRET>)
.setApplicationOnlyAuthEnabled(true); // IMPORTANT: set T4J to use App-only auth
TwitterFactory tf = new TwitterFactory(cb.build());
Twitter twitter = tf.getInstance();
OAuth2Token token = twitter.getOAuth2Token();
if (token != null) {
System.out.println("Token Type : " + token.getTokenType());
System.out.println("Access Token: " + token.getAccessToken());
}
ResponseList<Status> list = twitter.getUserTimeline(783214); // Load #twitter's timeline without user login.
Key points of the above sample code:
Call setApplicationOnlyAuthEnabled(true) to enable Application-only authentication.
Get the access Token using getOAuth2Token() instead of getOAuthAccessToken()

This is certainly possible and I have already tried it. If your doubt is only regarding the Access Token and Access Token secret being empty, then you should try to use the Access Token provided in the app page. By app page I mean, the link where you have registered your twitter app.
If you go to dev.twitter.com ,and go to your app settings, you can see a consumer key, consumer secret, access token and access token secret. Make use of these and follow my below code and it should work,
ConfigurationBuilder cb = new ConfigurationBuilder();
cb.setDebugEnabled(true)
.setOAuthConsumerKey("B*************Q")
.setOAuthConsumerSecret(
"l*************o")
.setOAuthAccessToken(
"1*************s")
.setOAuthAccessTokenSecret(
"s*************s");
TwitterFactory tf = new TwitterFactory(cb.build());
twitter = tf.getInstance();
try {
List<Status> statuses;
String user;
user = "Replace this with the screen name whose feeds you want to fetch";
statuses = twitter.getUserTimeline(user);
Log.i("Status Count", statuses.size() + " Feeds");
} catch (TwitterException te) {
te.printStackTrace();
}
I used twitter 4j 3.03.jar for this.

How can I get a Twitter public timeline with no Access Token and Secret using Twitter4j?
Oh, that is very simple. YOU CAN'T.
Twitter a a data based company. 99% of the property of the company (I mean what the company owns) is data. It would be contra-productive, to give this data for free out to other people/businesses.
If the thing you want, would be possible, then there would be an easy way to backup the whole twitter database.
That is why they let you register an account for each application, that wants to use the API and limit each account to a certain amount of API calls per time frame. Of course they also want to prevent their network from spam etc.

If you want get tweets without user authenticating, you can use Application-only Authentication, because the user doesn´t need to login.
With Application-only authentication Twitter offers applications the ability to issue authenticated requests on behalf of the application itself (as opposed to on behalf of a specific user)
The application-only auth flow follows these steps:
An application encodes its consumer key and secret into a specially encoded set of credentials.
An application makes a request to the POST oauth2/token endpoint to exchange these credentials for a bearer token.
When accessing the REST API, the application uses the bearer token to authenticate.
NOTE: Because twitter4j has added this feature recently, you should use the last snapshot library.
An example using it:
private ConfigurationBuilder builder;
private Twitter twitter;
private TwitterFactory factory;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.init_act_layout);
// setup
builder = new ConfigurationBuilder();
builder.setUseSSL(true);
builder.setApplicationOnlyAuthEnabled(true);
builder.setOAuthConsumerKey(Constants.CONSUMER_KEY);
builder.setOAuthConsumerSecret(Constants.CONSUMER_SECRET);
Configuration configuration = builder.build();
factory = new TwitterFactory(configuration);
((MyApp) (MyApp.getApp())).setTFactory(factory);
if (isNeededTwitterAuth()) {
twitter = factory.getInstance();
//Get the token async and save it
}
//Search tweets
}
/*
* Checks if twitter access token is already saved in preferences
*
* #return true if auth needed
*/
private boolean isNeededTwitterAuth() {
SharedPreferences settings = getSharedPreferences(Constants.TWITTER_PREFERENCES, Context.MODE_PRIVATE);
String twitterAccesToken = settings.getString("bearerAccessToken", "");
String twitterTokenType = settings.getString("bearerTokenType", "");
return ((twitterAccesToken.length() == 0) && (twitterTokenType.length() == 0));
}
}
To get the bearer token, do it out of Main UI thread to avoid Network exception, f.i. using AsyncTask:
#Override
protected OAuth2Token doInBackground(Void... params) {
OAuth2Token bearerToken = null;
try {
bearerToken = twitter.getOAuth2Token();
} catch (TwitterException e) {
e.printStackTrace();
}
return bearerToken;
}
When you obtain the bearer token, save it:
SharedPreferences appSettings = getSharedPreferences(Constants.TWITTER_PREFERENCES, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = appSettings.edit();
prefEditor.putString("bearerAccessToken", result.getAccessToken());
prefEditor.putString("bearerTokenType", result.getTokenType());
prefEditor.commit();
And to use the bearer token:
OAuth2Token bearerToken = new OAuth2Token(bearerTokenType, bearerAccesstoken);
twitter.setOAuth2Token(bearerToken);
And search tweets (always out of Main thread):
#Override
protected QueryResult doInBackground(Void... params) {
twitter.setOAuth2Token(bearerToken);
Query query = new Query();
[...]
result = twitter.search(query);
A complete explanation in the blog (in Spanish...)
And a complete example in the twitter4j github
Hope it helps!

Twitter4j Truncating Tweets

I am currently making a test application to retrieve tweets from a Twitter account and display them on the screen.
All my code is working fine, but a few Tweets are being truncated.
Anyone aware of what might be causing this and how to fix it?
Code for retrieving tweets:
Twitter twitter = new TwitterFactory().getInstance();
List<Status> statuses = null;
try
{
statuses = twitter.getUserTimeline("usu_unitec");
}
catch (TwitterException e)
{
e.printStackTrace();
}
ArrayList<String> news = new ArrayList<String>();
for (Status status : statuses)
{
news.add(status.getText());
}
return news;
Twitter account:
https://twitter.com/USU_Unitec
Example of Tweets being truncated:
Did you catch Aaradhna on Good Morning today? What did you think? We
were pretty blown away... Check out her... http ...
#USU_Unitec USU yous are awesome looking after us students , if I was
on campus I'd come and get it , but I'm on study leave ...
A reminder to check out our Summer School courses. You don't need to
be studying full time to get ahead! http://t.c ...

Why not use the Twitter JSON or XML API call directly? with this you can fetch all Tweets in full length :)
https://dev.twitter.com/docs/api/1/get/statuses/user_timeline

Android - Facebook API giving empty result for user cover photo

I'm trying to get the user's cover photo and show it at the top of a layout. I'm using AsyncTask to run the API call to Facebook. The code I'm using to get the Facebook data is
JSONObject json = null;
response = Utility.facebook.request("me?fields=cover");
json = Util.parseJson(response);
The exception that stops the thread comes from a json error on the next step because the returned json is empty, even though the request clears through. I can get a proper json using just "me" or "me/albums" or anything other than "me?fields=cover". When I comment out the last line, 'try' process finishes with no exceptions/errors.
Is there something wrong with the Facebook API or am I doing something wrong?

I personally prefer using FQL when dealing with User Profile. If you would like to give FQL a try, check the following piece of code. If you would like to stick to Graph API, see this answer: https://stackoverflow.com/a/12434640/450534
try {
String query = "SELECT pic_cover FROM user where uid = " + PUT_THE_USER_ID_HERE;
Bundle param = new Bundle();
param.putString("method", "fql.query");
param.putString("query", query);
String response = Utility.mFacebook.request(param);
JSONArray JAUser = new JSONArray(response);
for (int i = 0; i < JAUser.length(); i++) {
JSONObject JOUser = JAUser.getJSONObject(i);
// COVER PHOTO
if (JOUser.has("pic_cover")) {
String getCover = JOUser.getString("pic_cover");
if (getCover.equals("null")) {
String finalCover = null;
} else {
JSONObject JOCoverSource = JOUser.optJSONObject("pic_cover");
if (JOCoverSource.has("source")) {
String finalCover = JOCoverSource.getString("source");
} else {
String finalCover = null;
}
}
} else {
String finalCover = null;
}
}
} catch (Exception e) {
// TODO: handle exception
}
The above code already accounts for User's who do not have a Cover Photo set in their profiles and checks for its availability. With this code, you will have the URL to the Cover Photo and can then process it as you prefer.
NOTE: If you are fetching the logged in users cover photo, this piece of code SELECT pic_cover FROM user where uid = " + PUT_THE_USER_ID_HERE; can also be written as: SELECT pic_cover FROM user where uid = me()"; For the non-logged in user's cover photo, the above can be used as is.
Couple of things as a side note.
I use Fedor's Lazy Loading technique to load images in almost exclusively.
I recommend running the code block, mine or any other solution you choose, in an AsyncTask.

The reason for not getting any result can be found in the javadoc of request(String graphPath) method:
(...) this method blocks waiting for a network response, so do not
call it in a UI thread.
In your case, you should probably do the following synchronous call:
Bundle params = new Bundle();
params.putString("fields", "cover");
String result = Utility.facebook.request("me/", params);
Siddharth Lele is very correct in his answer, but I wanted to specify the actual reason for not getting any response in this case.

Note: Fetching Cover Photo using Facebook API and endpoint https://graph.facebook.com/me?fields=cover no longer works as on 20th Dec 2014.
It was supposed to give following response:
{
"cover": {
"cover_id": "10151008748223553",
"source": "http://sphotos-a.ak.fbcdn.net/hphotos-ak-ash4/s720x720/391237_10151008748223553_422785532_n.jpg",
"offset_y": 0
},
"id": "19292868552"
}
But now it just gives User's id:
{
"id": "19292868552"
}
Verified this using Graph Tool explorer v2.2 using me?fields=cover.

How to update tweets using Twitter 4J?

I am using Twitter4J (2.1.0) to try to update tweets. I can't figure out what is wrong with my code.
In particular my problems are:
(a) Not all tweets post successfully. I often get the error code of -1. According to a google group post...
You get code -1 when the internal http component fails to connect to
or read from the API. You may also get code -1 when the API is
unreachable from the JVM due to the DNS related issues.
Strangely I seemed to be getting this pretty much every second post. To deal with this whenever I received the -1 error code I would try to update again. While I realise this is not a very good solution. this fixed the probem 95% of the time
(b) I get a duplication errors (error code 403) whenever the new tweet matches any old tweet
Error code 403 occurs even if the duplicate is now outdated (eg. post "Hello there", post a variety of status updates, then post "Hello there" again throws a TwitterException with error code 403)
My current code...
My code is in an AsyncTask which is in turn in a Service (rather than activity). I have included the Asynctask code and another method below....
class SendTwitAsyncTask extends AsyncTask<String, Void, Void> {
#Override
protected Void doInBackground(String... params) {
String tokenTwit = params[0];
String tokenSecretTwit = params[1];
String strMessageBody = params[2];
AccessToken aToken = new AccessToken(tokenTwit, tokenSecretTwit);
// initialize Twitter4J
Twitter twitter = new TwitterFactory().getInstance();
twitter.setOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);
twitter.setOAuthAccessToken(aToken);
// create a tweet
// strMessageBody varies
String tweet = strMessageBody;
boolean bool = twitter.isOAuthEnabled();
if (twitter.isOAuthEnabled()) {
GeoLocation geolocation = new GeoLocation(-33.91, 151.25);
try {
twitter.updateStatus(tweet, geolocation);
showNotification("Twitter One" , TWIT_SUCCESS);
} catch (TwitterException te) {
if (te.getStatusCode() == -1) {
//try again
try {
twitter.updateStatus(tweet, geolocation);
showNotification("Twitter Two ", TWIT_SUCCESS);
}
catch (TwitterException tetwo) {
describeTwitException(tetwo.getStatusCode());
}
} //end if
//else exception other than -1
else {
describeTwitException(te.getStatusCode());
} //end else
}// end outer catch
} //end if
else {
showNotification("Unable to authenticate" , TWIT_FAIL);
}//
return null;
}
} //end class SendTwitAsyncTask
public void describeTwitException(int twitExceptionCode) {
switch (twitExceptionCode) {
case (-1):
showNotification("Twitter (unable to connect)", TWIT_FAIL);
break;
case(403):
showNotification("Twitter (duplicate tweet)", TWIT_FAIL);
break;
default:
showNotification("Twitter", TWIT_FAIL);
} //end switch
} //end describeTwitException method

The twitter API will reject any tweet that matches a tweet that you've already made. I don't think the old tweet ever 'expires.'

how to sign out in LinkedIn using authrequest using android?

i developed one app integrated with linkedIn..!
i do SignIn authentication in linkedIn using OAuth Service to post the Network Update..but now how to sign out (de-authenticate) to the LinkedIn automatically?
Thanks in adv..

As per the official blog
Token Invalidation
Now you can invalidate an OAuth token for your application. Just send an OAuth signed GET request to:
https://api.linkedin.com/uas/oauth/invalidateToken
A 200 response indicates that the token was successfully invalidated.
However as per this :
Third party applications do not have any way to log a user out from
LinkedIn - this is controlled by the website. Invalidating the token
makes the user re-authorize the next time they try to use the
application, but once they have logged into LinkedIn their browser
will remain logged in until they log out via the website.
So In conclusion : as of this date of writing, Linked In does not give this support to 3rd Party Applications

Reading your question i have also tried to find solution and also talked to Mr. Nabeel Siddiqui - Author of linkedin-j API
and this was his reply when i asked if it's possible to sign out using linkedin-j api?
Hi Mayur
There is a method LinkedInOAuthService#invalidateAccessToken that is supposed to invalidate your access token. Its not used much by the community so I am not sure if it works as expected or not. Do try it and let me know if there are problems.
Regards
Nabeel Mukhtar
so in my activity i tried it using this way.
final LinkedInOAuthService oAuthService = LinkedInOAuthServiceFactory.getInstance().createLinkedInOAuthService(consumerKey, consumerSecret);
final LinkedInApiClientFactory factory = LinkedInApiClientFactory.newInstance(consumerKey, consumerSecret);
LinkedInRequestToken liToken;
LinkedInApiClient client;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
liToken = oAuthService.getOAuthRequestToken(CALLBACKURL);
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(liToken.getAuthorizationUrl()));
startActivity(i);
}
#Override
protected void onNewIntent(Intent intent)
{
super.onNewIntent(intent);
Uri uri = intent.getData();
if (uri != null && uri.toString().startsWith(CALLBACKURL))
{
String verifier = intent.getData().getQueryParameter("oauth_verifier");
LinkedInAccessToken accessToken = oAuthService.getOAuthAccessToken(liToken, verifier);
client = factory.createLinkedInApiClient(accessToken);
Connections con = client.getConnectionsForCurrentUser();
//AFTER FETCHING THE DATA I HAVE DONE
oAuthService.invalidateAccessToken(accessToken);
//this is for sign out
}
}
Please, Try this way once and tell me if it solves your problem.
cause I have also donwloaded and seen the SourceCode for linkedin-j API and in
LinkedInOAuthServiceImpl.java
they have given the function and that function also works if we write the same code in our file.
that is,
#Override
public void invalidateAccessToken(LinkedInAccessToken accessToken) {
if (accessToken == null) {
throw new IllegalArgumentException("access token cannot be null.");
}
try {
URL url = new URL(LinkedInApiUrls.LINKED_IN_OAUTH_INVALIDATE_TOKEN_URL);
HttpURLConnection request = (HttpURLConnection) url.openConnection();
final OAuthConsumer consumer = getOAuthConsumer();
consumer.setTokenWithSecret(accessToken.getToken(), accessToken.getTokenSecret());
consumer.sign(request);
request.connect();
if (request.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new LinkedInOAuthServiceException(convertStreamToString(request.getErrorStream()));
}
} catch (Exception e) {
throw new LinkedInOAuthServiceException(e);
}
}