Author: Subhankar29

We have used Twitter4j API to authenticate Twitter in Phimpme application. Below are the following steps in setting up the Twitter4j API in Phimpme and Login to Twitter from Phimpme android application. Setting up the environment Download the Twitter4j package from http://twitter4j.org/en/. For sharing images we will only need twitter4j-core-3.0.5.jar and twitter4j-media-support-3.0.5.jar files. Copy these files and save it in the libs folder of the application. Go to build.gradle and add the following codes in dependencies: dependencies { compile files('libs/twitter4j-core-3.0.5.jar') compile files('libs/twitter4j-media-support-3.0.5.jar') } Adding Phimpme application in Twitter development page Go to https://dev.twitter.com/->My apps-> Create new apps. Create an application window opens where we have to fill all the necessary details about the application. It is mandatory to fill all the fields. In website field, if you are making an android application then anything can be filled in website field for example www.google.com. But it is necessary to fill this field also. After filling all the details click on “Create your Twitter application” button. Adding Twitter Consumer Key and Secret Key This generates twitter consumer key and twitter secret key. We need to add this in our string.xml folder. <string name="twitter_consumer_key">ry1PDPXM6rwFVC1KhQ585bJPy</string> <string name="twitter_consumer_secret">O3qUqqBLinr8qrRvx3GXHWBB1AN10Ax26vXZdNlYlEBF3vzPFt</string> Twitter Authentication Make a new JAVA class say LoginActivity. Where we have to first fetch the twitter consumer key and Twitter secret key. private static Twitter twitter;    private static RequestToken requestToken;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_twitter_login);        twitterConsumerKey = getResources().getString(R.string.twitter_consumer_key);        twitterConsumerSecret = getResources().getString(R.string.twitter_consumer_secret);   We are using a web view to interact with the Twitter login page. twitterLoginWebView = (WebView)findViewById(R.id.twitterLoginWebView);        twitterLoginWebView.setBackgroundColor(Color.TRANSPARENT);        twitterLoginWebView.setWebViewClient( new WebViewClient(){            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url){                if( url.contains(AppConstant.TWITTER_CALLBACK_URL)){                    Uri uri = Uri.parse(url);                    LoginActivity.this.saveAccessTokenAndFinish(uri);                    return true;                }                return false;            }              If the access Token is already saved then the user is already signed in or else it sends the Twitter consumer key and the Twitter secret key to gain access Token. ConfigurationBuilder function is used to set the consumer key and consumer secret key. ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();        configurationBuilder.setOAuthConsumerKey(twitterConsumerKey);     configurationBuilder.setOAuthConsumerSecret(twitterConsumerSecret);        Configuration configuration = configurationBuilder.build();        twitter = new TwitterFactory(configuration).getInstance(); It is followed by the following Runnable thread to check if the request token is received or not. If authentication fails, an error Toast message pops. new Thread(new Runnable() {            @Override            public void run() {                try {                    requestToken = twitter.getOAuthRequestToken(AppConstant.TWITTER_CALLBACK_URL);                } catch (Exception e) {                    final String errorString = e.toString();                    LoginActivity.this.runOnUiThread(new Runnable() {                        @Override                        public void run() {                            mAlertBuilder.cancel();                            Toast.makeText(LoginActivity.this, errorString, Toast.LENGTH_SHORT).show();                            finish();                        }                    });                    return;                }                LoginActivity.this.runOnUiThread(new Runnable() {                    @Override                    public void run() {                        twitterLoginWebView.loadUrl(requestToken.getAuthenticationURL());                    }                });            }        }).start(); Conclusion It offers seamless integration of Twitter in any application. Without leaving actual application, easier to authenticate. Further, it is used to upload the photo to Twitter directly from Phimpme Android application, fetch profile picture and username. Github https://github.com/fossasia/phimpme-android Resources To create app https://dev.twitter.com/ To download the Twitter4j Package: http://twitter4j.org/en/ Youtube tutorial: https://www.youtube.com/watch?v=_IsBi3cpvio Blog Post: http://www.theappguruz.com/blog/android-twitter-integration-tutorial