OAuth to authorize app with Twitter in android

          Writer:-        Marko Gargenta

                              @MarkoGargenta

                              Marakana, Inc.

                                                                             
Here's a simple example that uses OAuth to authorize your app with Twitter. I use Jamba-modified JTwitter library here. The source code is included, but you must get your own OAuth key from Twitter by going to https://dev.twitter.com/apps/new.

You should enter something like this when registering your app:




MainActivity.java

Note that I use SignPost and JTwitter libraries with this code (provided in source). Also, the key to this code is the callback from the browser back to the app. You need to see the Manifest file down below to get the whole picture.

Code:

package com.marakana.oauth;

import oauth.signpost.OAuth;
import oauth.signpost.OAuthConsumer;
import oauth.signpost.OAuthProvider;
import oauth.signpost.basic.DefaultOAuthProvider;
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
import oauth.signpost.exception.OAuthCommunicationException;
import oauth.signpost.exception.OAuthExpectationFailedException;
import oauth.signpost.exception.OAuthMessageSignerException;
import oauth.signpost.exception.OAuthNotAuthorizedException;
import winterwell.jtwitter.OAuthSignpostClient;
import winterwell.jtwitter.Twitter;
import winterwell.jtwitter.TwitterException;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
  private static final String TAG = "OAuthDemo";
  private static final String OAUTH_KEY = "YOUR_KEY_GOES_HERE";
  private static final String OAUTH_SECRET = "YOUR_SECRET_GOES_HERE";
  private static final String OAUTH_CALLBACK_SCHEME = "x-marakana-oauth-twitter";
  private static final String OAUTH_CALLBACK_URL = OAUTH_CALLBACK_SCHEME
      + "://callback";
  private static final String TWITTER_USER = "YOUR_EMAIL_GOES_HERE";

  private OAuthSignpostClient oauthClient;
  private OAuthConsumer mConsumer;
  private OAuthProvider mProvider;
  private Twitter twitter;
  SharedPreferences prefs;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    // mConsumer = new DefaultOAuthConsumer(OAUTH_KEY, OAUTH_SECRET);
    mConsumer = new CommonsHttpOAuthConsumer(OAUTH_KEY, OAUTH_SECRET);
    mProvider = new DefaultOAuthProvider(
        "https://api.twitter.com/oauth/request_token",
        "https://api.twitter.com/oauth/access_token",
        "https://api.twitter.com/oauth/authorize");

    // Read the prefs to see if we have token
    prefs = PreferenceManager.getDefaultSharedPreferences(this);
    String token = prefs.getString("token", null);
    String tokenSecret = prefs.getString("tokenSecret", null);
    if (token != null && tokenSecret != null) {
      // We have token, use it
      mConsumer.setTokenWithSecret(token, tokenSecret);
      // Make a Twitter object
      oauthClient = new OAuthSignpostClient(OAUTH_KEY, OAUTH_SECRET, token,
          tokenSecret);
      twitter = new Twitter(TWITTER_USER, oauthClient);
    }
  }

  /* Callback once we are done with the authorization of this app with Twitter. */
  @Override
  public void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    Log.d(TAG, "intent: " + intent);

    // Check if this is a callback from OAuth
    Uri uri = intent.getData();
    if (uri != null && uri.getScheme().equals(OAUTH_CALLBACK_SCHEME)) {
      Log.d(TAG, "callback: " + uri.getPath());

      String verifier = uri.getQueryParameter(OAuth.OAUTH_VERIFIER);
      Log.d(TAG, "verifier: " + verifier);

      new RetrieveAccessTokenTask().execute(verifier);
    }

  }

  public void onClickAuthorize(View view) {
    new OAuthAuthorizeTask().execute();
  }

  public void onClickTweet(View view) {
    if (twitter == null) {
      Toast.makeText(this, "Authenticate first", Toast.LENGTH_LONG).show();
      return;
    }

    EditText status = (EditText) findViewById(R.id.status);
    new PostStatusTask().execute(status.getText().toString());
  }

  public void onClickGetStatus(View view) {
    if (twitter == null) {
      Toast.makeText(this, "Authenticate first", Toast.LENGTH_LONG).show();
      return;
    }
    new GetStatusTask().execute();
  }

  /* Responsible for starting the Twitter authorization */
  class OAuthAuthorizeTask extends AsyncTask<Void, Void, String> {

    @Override
    protected String doInBackground(Void... params) {
      String authUrl;
      String message = null;
      try {
        authUrl = mProvider.retrieveRequestToken(mConsumer, OAUTH_CALLBACK_URL);
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(authUrl));
        startActivity(intent);
      } catch (OAuthMessageSignerException e) {
        message = "OAuthMessageSignerException";
        e.printStackTrace();
      } catch (OAuthNotAuthorizedException e) {
        message = "OAuthNotAuthorizedException";
        e.printStackTrace();
      } catch (OAuthExpectationFailedException e) {
        message = "OAuthExpectationFailedException";
        e.printStackTrace();
      } catch (OAuthCommunicationException e) {
        message = "OAuthCommunicationException";
        e.printStackTrace();
      }
      return message;
    }

    @Override
    protected void onPostExecute(String result) {
      super.onPostExecute(result);
      if (result != null) {
        Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
      }
    }
  }

  /* Responsible for retrieving access tokens from twitter */
  class RetrieveAccessTokenTask extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {
      String message = null;
      String verifier = params[0];
      try {
        // Get the token
        Log.d(TAG, "mConsumer: " + mConsumer);
        Log.d(TAG, "mProvider: " + mProvider);
        mProvider.retrieveAccessToken(mConsumer, verifier);
        String token = mConsumer.getToken();
        String tokenSecret = mConsumer.getTokenSecret();
        mConsumer.setTokenWithSecret(token, tokenSecret);

        Log.d(TAG, String.format("verifier: %s, token: %s, tokenSecret: %s",
            verifier, token, tokenSecret));

        // Store token in prefs
        prefs.edit().putString("token", token).putString("tokenSecret",
            tokenSecret).commit();

        // Make a Twitter object
        oauthClient = new OAuthSignpostClient(OAUTH_KEY, OAUTH_SECRET, token,
            tokenSecret);
        twitter = new Twitter("MarkoGargenta", oauthClient);

        Log.d(TAG, "token: " + token);
      } catch (OAuthMessageSignerException e) {
        message = "OAuthMessageSignerException";
        e.printStackTrace();
      } catch (OAuthNotAuthorizedException e) {
        message = "OAuthNotAuthorizedException";
        e.printStackTrace();
      } catch (OAuthExpectationFailedException e) {
        message = "OAuthExpectationFailedException";
        e.printStackTrace();
      } catch (OAuthCommunicationException e) {
        message = "OAuthCommunicationException";
        e.printStackTrace();
      }
      return message;
    }

    @Override
    protected void onPostExecute(String result) {
      super.onPostExecute(result);
      if (result != null) {
        Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
      }
    }
  }

  /* Responsible for getting Twitter status */
  class GetStatusTask extends AsyncTask<Void, Void, String> {
    @Override
    protected String doInBackground(Void... params) {
      return twitter.getStatus().text;
    }

    @Override
    protected void onPostExecute(String result) {
      super.onPostExecute(result);
      Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
    }
  }

  /* Responsible for posting new status to Twitter */
  class PostStatusTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... params) {
      try {
        twitter.setStatus(params[0]);
        return "Successfully posted: " + params[0];
      } catch (TwitterException e) {
        return "Error connecting to server.";
      }
    }

    @Override
    protected void onPostExecute(String result) {
      super.onPostExecute(result);
      Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
    }

  }
}

AndroidManifest.xml

The key here is the intent filter that serves as a callback to our main activity to complete the authentication process.

Code:

<?xml version="1.0" encoding="utf-8"?>
<manifest
  xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.marakana.oauth"
  android:versionCode="1"
  android:versionName="1.0">
  <uses-sdk
    android:minSdkVersion="11" />
  <uses-permission
    android:name="android.permission.INTERNET" />


  <application
    android:icon="@drawable/icon"
    android:label="@string/app_name">
    <activity
      android:name=".MainActivity"
      android:label="@string/app_name"
      android:launchMode="singleInstance">
      <intent-filter>
        <action
          android:name="android.intent.action.MAIN" />
        <category
          android:name="android.intent.category.LAUNCHER" />
      </intent-filter>

      <!-- Used for OAuth callback -->
      <intent-filter>
        <action
          android:name="android.intent.action.VIEW" />
        <category
          android:name="android.intent.category.DEFAULT" />
        <category
          android:name="android.intent.category.BROWSABLE" />
        <data
          android:scheme="x-marakana-oauth-twitter"
          android:host="callback" />
      </intent-filter>

    </activity>

  </application>
</manifest>

main.xml Layout

Nothing special here, just basic UI stuff.

Code:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:gravity="center_horizontal">

  <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@string/app_name"
    android:textSize="50sp"
    android:gravity="center" />
  <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Authenticate"
    android:onClick="onClickAuthorize"
    android:textSize="40sp"></Button>
  <EditText
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:id="@+id/status"
    android:textSize="40sp"
    android:hint="What's up?"></EditText>
  <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Tweet"
    android:onClick="onClickTweet"
    android:textSize="40sp"></Button>
  <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Get Status"
    android:textSize="40sp"
    android:onClick="onClickGetStatus"></Button>

</LinearLayout>

Source code is here:
https://github.com/marakana/OAuthDemo

Source article:- marakana.com