├── .gitignore
├── res
    ├── drawable-hdpi
    │   └── icon.png
    ├── drawable-ldpi
    │   └── icon.png
    ├── drawable-mdpi
    │   └── icon.png
    ├── values
    │   └── strings.xml
    └── layout
    │   └── main.xml
├── .settings
    ├── org.maven.ide.eclipse.prefs
    └── org.eclipse.jdt.core.prefs
├── README
├── default.properties
├── .classpath
├── .project
├── src
    └── com
    │   └── ecs
    │       └── android
    │           └── oauth
    │               ├── Constants.java
    │               ├── RetrieveAccessTokenTask.java
    │               ├── OAuthRequestTokenTask.java
    │               ├── PrepareRequestTokenActivity.java
    │               └── OAuthFlowApp.java
├── AndroidManifest.xml
└── pom.xml


/.gitignore:
--------------------------------------------------------------------------------
1 | /bin
2 | /target
3 | 


--------------------------------------------------------------------------------
/res/drawable-hdpi/icon.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/ddewaele/AndroidOAuthFlowSample/HEAD/res/drawable-hdpi/icon.png


--------------------------------------------------------------------------------
/res/drawable-ldpi/icon.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/ddewaele/AndroidOAuthFlowSample/HEAD/res/drawable-ldpi/icon.png


--------------------------------------------------------------------------------
/res/drawable-mdpi/icon.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/ddewaele/AndroidOAuthFlowSample/HEAD/res/drawable-mdpi/icon.png


--------------------------------------------------------------------------------
/res/values/strings.xml:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="utf-8"?>
2 | <resources>
3 |     <string name="hello">Hello World, OAuthFlowApp!</string>
4 |     <string name="app_name">AndroidOAuthFlow</string>
5 | </resources>
6 | 


--------------------------------------------------------------------------------
/.settings/org.maven.ide.eclipse.prefs:
--------------------------------------------------------------------------------
1 | #Mon Dec 13 19:22:47 CET 2010
2 | activeProfiles=
3 | eclipse.preferences.version=1
4 | fullBuildGoals=process-test-resources
5 | resolveWorkspaceProjects=true
6 | resourceFilterGoals=process-resources resources\:testResources
7 | skipCompilerPlugin=true
8 | version=1
9 | 


--------------------------------------------------------------------------------
/.settings/org.eclipse.jdt.core.prefs:
--------------------------------------------------------------------------------
1 | #Tue Dec 14 17:42:58 CET 2010
2 | eclipse.preferences.version=1
3 | org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
4 | org.eclipse.jdt.core.compiler.compliance=1.6
5 | org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
6 | org.eclipse.jdt.core.compiler.source=1.6
7 | 


--------------------------------------------------------------------------------
/README:
--------------------------------------------------------------------------------
 1 | Sample Android app that does the OAuth Dance.
 2 | 
 3 | Accompanying article can be found here : 
 4 | 
 5 | http://blog.doityourselfandroid.com/2010/11/10/oauth-flow-in-android-app/
 6 | 
 7 | Goes through all the steps of the OAuth Flow
 8 | 
 9 | * Get Request Token
10 | * Authorize Token
11 | * Get Access Token
12 | * Perform Google API call (retrieve contacts).
13 |  


--------------------------------------------------------------------------------
/default.properties:
--------------------------------------------------------------------------------
 1 | # This file is automatically generated by Android Tools.
 2 | # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
 3 | # 
 4 | # This file must be checked in Version Control Systems.
 5 | # 
 6 | # To customize properties used by the Ant build system use,
 7 | # "build.properties", and override values to adapt the script to your
 8 | # project structure.
 9 | 
10 | # Project target.
11 | target=android-4
12 | 


--------------------------------------------------------------------------------
/.classpath:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <classpath>
 3 | 	<classpathentry kind="src" output="target/classes" path="src"/>
 4 | 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
 5 | 	<classpathentry kind="con" path="org.maven.ide.eclipse.MAVEN2_CLASSPATH_CONTAINER"/>
 6 | 	<!--
 7 | 	<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
 8 | 	-->
 9 | 	<classpathentry kind="src" output="target/android-classes" path="gen">
10 | 		<attributes>
11 | 			<attribute name="optional" value="true"/>
12 | 		</attributes>
13 | 	</classpathentry>
14 | 	<classpathentry kind="output" path="target/android-classes"/>
15 | </classpath>
16 | 


--------------------------------------------------------------------------------
/.project:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <projectDescription>
 3 | 	<name>AndroidOAuthFlowSample</name>
 4 | 	<comment></comment>
 5 | 	<projects>
 6 | 	</projects>
 7 | 	<buildSpec>
 8 | 		<buildCommand>
 9 | 			<name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
10 | 			<arguments>
11 | 			</arguments>
12 | 		</buildCommand>
13 | 		<buildCommand>
14 | 			<name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
15 | 			<arguments>
16 | 			</arguments>
17 | 		</buildCommand>
18 | 		<buildCommand>
19 | 			<name>org.eclipse.jdt.core.javabuilder</name>
20 | 			<arguments>
21 | 			</arguments>
22 | 		</buildCommand>
23 | 		<buildCommand>
24 | 			<name>org.maven.ide.eclipse.maven2Builder</name>
25 | 			<arguments>
26 | 			</arguments>
27 | 		</buildCommand>
28 | 	</buildSpec>
29 | 	<natures>
30 | 		<nature>org.maven.ide.eclipse.maven2Nature</nature>
31 | 		<nature>com.android.ide.eclipse.adt.AndroidNature</nature>
32 | 		<nature>org.eclipse.jdt.core.javanature</nature>
33 | 	</natures>
34 | </projectDescription>
35 | 


--------------------------------------------------------------------------------
/res/layout/main.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3 |     android:orientation="vertical"
 4 |     android:layout_width="fill_parent"
 5 |     android:layout_height="fill_parent"
 6 |     >
 7 | 	    <Button android:id="@+id/btn_launch_oauth"
 8 | 	            android:layout_width="wrap_content"
 9 | 	            android:layout_height="wrap_content"
10 | 	            android:text="Launch OAuth Flow"/>
11 | 
12 | 	    <Button android:id="@+id/btn_clear_credentials"
13 | 	            android:layout_width="wrap_content"
14 | 	            android:layout_height="wrap_content"
15 | 	            android:text="Clear Credentials"/>	 
16 | 	            
17 |             <TextView android:id="@+id/response_code"
18 |                 android:layout_width="wrap_content"
19 |                 android:layout_height="wrap_content"
20 |                 android:text=""
21 | 			    android:textColor="#FFFFFF"
22 | 			    android:typeface="normal"/>  	                       
23 | </LinearLayout>
24 | 


--------------------------------------------------------------------------------
/src/com/ecs/android/oauth/Constants.java:
--------------------------------------------------------------------------------
 1 | package com.ecs.android.oauth;
 2 | 
 3 | 
 4 | public class Constants {
 5 | 
 6 | 	public static final String CONSUMER_KEY 	= "anonymous";
 7 | 	public static final String CONSUMER_SECRET 	= "anonymous";
 8 | 
 9 | 	public static final String SCOPE 			= "https://www.google.com/m8/feeds/";
10 | 	public static final String REQUEST_URL 		= "https://www.google.com/accounts/OAuthGetRequestToken";
11 | 	public static final String ACCESS_URL 		= "https://www.google.com/accounts/OAuthGetAccessToken";  
12 | 	public static final String AUTHORIZE_URL 	= "https://www.google.com/accounts/OAuthAuthorizeToken";
13 | 	
14 | 	public static final String API_REQUEST 		= "https://www.google.com/m8/feeds/contacts/default/full?alt=json";
15 | 	
16 | 	public static final String ENCODING 		= "UTF-8";
17 | 	
18 | 	public static final String	OAUTH_CALLBACK_SCHEME	= "x-oauthflow";
19 | 	public static final String	OAUTH_CALLBACK_HOST		= "callback";
20 | 	public static final String	OAUTH_CALLBACK_URL		= OAUTH_CALLBACK_SCHEME + "://" + OAUTH_CALLBACK_HOST;
21 | 
22 | }
23 | 


--------------------------------------------------------------------------------
/AndroidManifest.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3 |       package="com.ecs.android.oauth"
 4 |       android:versionCode="1"
 5 |       android:versionName="1.0">
 6 |       
 7 |       <uses-permission android:name="android.permission.INTERNET"/>
 8 |       <uses-permission android:name="android.permission.READ_CONTACTS"/>
 9 |       
10 |     <application android:icon="@drawable/icon" android:label="@string/app_name">
11 |         <activity android:name=".OAuthFlowApp"
12 |                   android:label="@string/app_name">
13 |             <intent-filter>
14 |                 <action android:name="android.intent.action.MAIN" />
15 |                 <category android:name="android.intent.category.LAUNCHER" />
16 |             </intent-filter>
17 |         </activity>
18 | 
19 | 		<activity android:name=".PrepareRequestTokenActivity" android:launchMode="singleTask">>
20 | 			<intent-filter>
21 | 				<action android:name="android.intent.action.VIEW" />
22 | 				<category android:name="android.intent.category.DEFAULT" />
23 | 				<category android:name="android.intent.category.BROWSABLE" />
24 | 				<data android:scheme="x-oauthflow" android:host="callback" />
25 | 			</intent-filter>
26 | 		</activity>
27 | 
28 |     </application>
29 | 
30 | 
31 | </manifest> 


--------------------------------------------------------------------------------
/src/com/ecs/android/oauth/RetrieveAccessTokenTask.java:
--------------------------------------------------------------------------------
 1 | package com.ecs.android.oauth;
 2 | 
 3 | import oauth.signpost.OAuth;
 4 | import oauth.signpost.OAuthConsumer;
 5 | import oauth.signpost.OAuthProvider;
 6 | import android.content.Context;
 7 | import android.content.Intent;
 8 | import android.content.SharedPreferences;
 9 | import android.content.SharedPreferences.Editor;
10 | import android.net.Uri;
11 | import android.os.AsyncTask;
12 | import android.util.Log;
13 | 
14 | public class RetrieveAccessTokenTask extends AsyncTask<Uri, Void, Void> {
15 | 
16 | 	final String TAG = getClass().getName();
17 | 	
18 | 	private Context	context;
19 | 	private OAuthProvider provider;
20 | 	private OAuthConsumer consumer;
21 | 	private SharedPreferences prefs;
22 | 	
23 | 	public RetrieveAccessTokenTask(Context context, OAuthConsumer consumer,OAuthProvider provider, SharedPreferences prefs) {
24 | 		this.context = context;
25 | 		this.consumer = consumer;
26 | 		this.provider = provider;
27 | 		this.prefs=prefs;
28 | 	}
29 | 
30 | 
31 | 	/**
32 | 	 * Retrieve the oauth_verifier, and store the oauth and oauth_token_secret 
33 | 	 * for future API calls.
34 | 	 */
35 | 	@Override
36 | 	protected Void doInBackground(Uri...params) {
37 | 		final Uri uri = params[0];
38 | 		
39 | 		
40 | 		final String oauth_verifier = uri.getQueryParameter(OAuth.OAUTH_VERIFIER);
41 | 
42 | 		try {
43 | 			provider.retrieveAccessToken(consumer, oauth_verifier);
44 | 
45 | 			final Editor edit = prefs.edit();
46 | 			edit.putString(OAuth.OAUTH_TOKEN, consumer.getToken());
47 | 			edit.putString(OAuth.OAUTH_TOKEN_SECRET, consumer.getTokenSecret());
48 | 			edit.commit();
49 | 			
50 | 			String token = prefs.getString(OAuth.OAUTH_TOKEN, "");
51 | 			String secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
52 | 			
53 | 			consumer.setTokenWithSecret(token, secret);
54 | 			context.startActivity(new Intent(context,OAuthFlowApp.class));
55 | 
56 | 			Log.i(TAG, "OAuth - Access Token Retrieved");
57 | 			
58 | 		} catch (Exception e) {
59 | 			Log.e(TAG, "OAuth - Access Token Retrieval Error", e);
60 | 		}
61 | 
62 | 		return null;
63 | 	}
64 | }


--------------------------------------------------------------------------------
/src/com/ecs/android/oauth/OAuthRequestTokenTask.java:
--------------------------------------------------------------------------------
 1 | package com.ecs.android.oauth;
 2 | 
 3 | import oauth.signpost.OAuthConsumer;
 4 | import oauth.signpost.OAuthProvider;
 5 | import android.content.Context;
 6 | import android.content.Intent;
 7 | import android.net.Uri;
 8 | import android.os.AsyncTask;
 9 | import android.util.Log;
10 | 
11 | /**
12 |  * An asynchronous task that communicates with Google to 
13 |  * retrieve a request token.
14 |  * (OAuthGetRequestToken)
15 |  * 
16 |  * After receiving the request token from Google, 
17 |  * show a browser to the user to authorize the Request Token.
18 |  * (OAuthAuthorizeToken)
19 |  * 
20 |  */
21 | public class OAuthRequestTokenTask extends AsyncTask<Void, Void, Void> {
22 | 
23 | 	final String TAG = getClass().getName();
24 | 	private Context	context;
25 | 	private OAuthProvider provider;
26 | 	private OAuthConsumer consumer;
27 | 
28 | 	/**
29 | 	 * 
30 | 	 * We pass the OAuth consumer and provider.
31 | 	 * 
32 | 	 * @param 	context
33 | 	 * 			Required to be able to start the intent to launch the browser.
34 | 	 * @param 	provider
35 | 	 * 			The OAuthProvider object
36 | 	 * @param 	consumer
37 | 	 * 			The OAuthConsumer object
38 | 	 */
39 | 	public OAuthRequestTokenTask(Context context,OAuthConsumer consumer,OAuthProvider provider) {
40 | 		this.context = context;
41 | 		this.consumer = consumer;
42 | 		this.provider = provider;
43 | 	}
44 | 
45 | 	/**
46 | 	 * 
47 | 	 * Retrieve the OAuth Request Token and present a browser to the user to authorize the token.
48 | 	 * 
49 | 	 */
50 | 	@Override
51 | 	protected Void doInBackground(Void... params) {
52 | 		
53 | 		try {
54 | 			Log.i(TAG, "Retrieving request token from Google servers");
55 | 			final String url = provider.retrieveRequestToken(consumer, Constants.OAUTH_CALLBACK_URL);
56 | 			Log.i(TAG, "Popping a browser with the authorize URL : " + url);
57 | 			Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)).setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_FROM_BACKGROUND);
58 | 			context.startActivity(intent);
59 | 			
60 | 		} catch (Exception e) {
61 | 			Log.e(TAG, "Error during OAUth retrieve request token", e);
62 | 		}
63 | 
64 | 		return null;
65 | 	}
66 | 
67 | }


--------------------------------------------------------------------------------
/pom.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3 |     <modelVersion>4.0.0</modelVersion>
 4 |     <groupId>com.ecs</groupId>
 5 |     <artifactId>AndroidOAuthFlowSample</artifactId>
 6 |     <packaging>apk</packaging>
 7 |     <version>0.0.1-SNAPSHOT</version>
 8 |     <name>AndroidOAuthFlowSample</name>
 9 |         
10 |     <dependencies>
11 |         <dependency>
12 |             <groupId>com.google.android</groupId>
13 |             <artifactId>android</artifactId>
14 |             <version>1.6_r2</version>
15 |             <scope>provided</scope>
16 |         </dependency>
17 |       <dependency>
18 |         <groupId>oauth.signpost</groupId>
19 |         <artifactId>signpost-core</artifactId>
20 |         <version>1.2.1.1</version>
21 |       </dependency>
22 |       <dependency>
23 |         <groupId>oauth.signpost</groupId>
24 |         <artifactId>signpost-commonshttp4</artifactId>
25 |         <version>1.2.1.1</version>
26 |       </dependency>    
27 |       <dependency>
28 |       	<groupId>org.json</groupId>
29 |       	<artifactId>json</artifactId>
30 |       	<version>20090211</version>
31 |       </dependency>
32 |     </dependencies>
33 | 
34 |     <build>
35 |    		<finalName>${project.artifactId}</finalName>
36 |         <sourceDirectory>src</sourceDirectory>
37 |         <plugins>
38 |             <plugin>
39 |                 <groupId>org.apache.maven.plugins</groupId>
40 |                 <artifactId>maven-compiler-plugin</artifactId>
41 |                 <version>2.3.2</version>
42 |                 <configuration>
43 |                     <source>1.6</source>
44 |                     <target>1.6</target>
45 |                 </configuration>
46 |             </plugin>
47 |             <plugin>
48 |                 <groupId>com.jayway.maven.plugins.android.generation2</groupId>
49 |                 <artifactId>maven-android-plugin</artifactId>
50 |                 <version>2.8.3</version>
51 |                 <configuration>
52 |                     <sdk>
53 |                         <platform>1.6</platform>
54 |                     </sdk>
55 |                     <deleteConflictingFiles>true</deleteConflictingFiles>
56 |                 </configuration>
57 |                 <extensions>true</extensions>
58 |             </plugin>
59 |         </plugins>
60 |     </build>
61 | 
62 | </project>


--------------------------------------------------------------------------------
/src/com/ecs/android/oauth/PrepareRequestTokenActivity.java:
--------------------------------------------------------------------------------
 1 | package com.ecs.android.oauth;
 2 | 
 3 | import java.net.URLEncoder;
 4 | 
 5 | import oauth.signpost.OAuthConsumer;
 6 | import oauth.signpost.OAuthProvider;
 7 | import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
 8 | import oauth.signpost.commonshttp.CommonsHttpOAuthProvider;
 9 | import android.app.Activity;
10 | import android.content.Intent;
11 | import android.content.SharedPreferences;
12 | import android.net.Uri;
13 | import android.os.Bundle;
14 | import android.preference.PreferenceManager;
15 | import android.util.Log;
16 | 
17 | /**
18 |  * Prepares a OAuthConsumer and OAuthProvider 
19 |  * 
20 |  * OAuthConsumer is configured with the consumer key & consumer secret.
21 |  * OAuthProvider is configured with the 3 OAuth endpoints.
22 |  * 
23 |  * Execute the OAuthRequestTokenTask to retrieve the request, and authorize the request.
24 |  * 
25 |  * After the request is authorized, a callback is made here.
26 |  * 
27 |  */
28 | public class PrepareRequestTokenActivity extends Activity {
29 | 
30 | 	final String TAG = getClass().getName();
31 | 	
32 |     private OAuthConsumer consumer; 
33 |     private OAuthProvider provider;
34 |     
35 | 	@Override
36 | 	public void onCreate(Bundle savedInstanceState) {
37 | 		super.onCreate(savedInstanceState);
38 |     	try {
39 |         	System.setProperty("debug", "true");
40 |     	      this.consumer = new CommonsHttpOAuthConsumer(Constants.CONSUMER_KEY, Constants.CONSUMER_SECRET);
41 |     	        this.provider = new CommonsHttpOAuthProvider(
42 |     	        		Constants.REQUEST_URL  + "?scope=" + URLEncoder.encode(Constants.SCOPE, Constants.ENCODING),
43 |     	        		Constants.ACCESS_URL,
44 |     	        		Constants.AUTHORIZE_URL);
45 |         	} catch (Exception e) {
46 |         		Log.e(TAG, "Error creating consumer / provider",e);
47 |     		}
48 | 
49 |         Log.i(TAG, "Starting task to retrieve request token.");
50 | 		new OAuthRequestTokenTask(this,consumer,provider).execute();
51 | 	}
52 | 
53 | 	/**
54 | 	 * Called when the OAuthRequestTokenTask finishes (user has authorized the request token).
55 | 	 * The callback URL will be intercepted here.
56 | 	 */
57 | 	@Override
58 | 	public void onNewIntent(Intent intent) {
59 | 		super.onNewIntent(intent); 
60 | 		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
61 | 		final Uri uri = intent.getData();
62 | 		if (uri != null && uri.getScheme().equals(Constants.OAUTH_CALLBACK_SCHEME)) {
63 | 			Log.i(TAG, "Callback received : " + uri);
64 | 			Log.i(TAG, "Retrieving Access Token");
65 | 			new RetrieveAccessTokenTask(this,consumer,provider,prefs).execute(uri);
66 | 			finish();	
67 | 		}
68 | 	}
69 | }
70 | 


--------------------------------------------------------------------------------
/src/com/ecs/android/oauth/OAuthFlowApp.java:
--------------------------------------------------------------------------------
  1 | package com.ecs.android.oauth;
  2 | 
  3 | import java.io.BufferedReader;
  4 | import java.io.InputStream;
  5 | import java.io.InputStreamReader;
  6 | 
  7 | import oauth.signpost.OAuth;
  8 | import oauth.signpost.OAuthConsumer;
  9 | import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
 10 | 
 11 | import org.apache.http.HttpResponse;
 12 | import org.apache.http.client.methods.HttpGet;
 13 | import org.apache.http.impl.client.DefaultHttpClient;
 14 | import org.json.JSONArray;
 15 | import org.json.JSONObject;
 16 | 
 17 | import android.app.Activity;
 18 | import android.content.Intent;
 19 | import android.content.SharedPreferences;
 20 | import android.content.SharedPreferences.Editor;
 21 | import android.database.Cursor;
 22 | import android.net.Uri;
 23 | import android.os.Bundle;
 24 | import android.preference.PreferenceManager;
 25 | import android.provider.Contacts.People;
 26 | import android.util.Log;
 27 | import android.view.View;
 28 | import android.widget.Button;
 29 | import android.widget.TextView;
 30 | 
 31 | /**
 32 |  * Entry point in the application.
 33 |  * Launches the OAuth flow by starting the PrepareRequestTokenActivity
 34 |  *
 35 |  */
 36 | public class OAuthFlowApp extends Activity {
 37 | 
 38 | 	private static final int PICK_CONTACT = 0;
 39 | 	final String TAG = getClass().getName();
 40 | 	private SharedPreferences prefs;
 41 | 	
 42 | 	@Override
 43 |     public void onCreate(Bundle savedInstanceState) {
 44 |         super.onCreate(savedInstanceState);
 45 |         setContentView(R.layout.main);
 46 |         this.prefs = PreferenceManager.getDefaultSharedPreferences(this);
 47 | 
 48 |         Button launchOauth = (Button) findViewById(R.id.btn_launch_oauth);
 49 |         Button clearCredentials = (Button) findViewById(R.id.btn_clear_credentials);
 50 |         
 51 |         launchOauth.setOnClickListener(new View.OnClickListener() {
 52 |             public void onClick(View v) {
 53 |             	startActivity(new Intent().setClass(v.getContext(), PrepareRequestTokenActivity.class));
 54 |             }
 55 |         });
 56 | 
 57 |         clearCredentials.setOnClickListener(new View.OnClickListener() {
 58 |             public void onClick(View v) {
 59 |             	clearCredentials();
 60 |             	performApiCall();
 61 |             }
 62 |         });
 63 |         
 64 |         
 65 |         performApiCall();
 66 |     }
 67 | 
 68 | 	private void performApiCall() {
 69 | 		TextView textView = (TextView) findViewById(R.id.response_code);
 70 | 		
 71 | 		String jsonOutput = "";
 72 |         try {
 73 |         	jsonOutput = doGet(Constants.API_REQUEST,getConsumer(this.prefs));
 74 |         	System.out.println("jsonOutput : " + jsonOutput);
 75 |         	JSONObject jsonResponse = new JSONObject(jsonOutput);
 76 |         	JSONObject m = (JSONObject)jsonResponse.get("feed");
 77 |         	JSONArray entries =(JSONArray)m.getJSONArray("entry");
 78 |         	String contacts="";
 79 |         	for (int i=0 ; i<entries.length() ; i++) {
 80 |         		JSONObject entry = entries.getJSONObject(i);
 81 |         		JSONObject title = entry.getJSONObject("title");
 82 |         		if (title.getString("$t")!=null && title.getString("$t").length()>0) {
 83 |         			contacts+=title.getString("$t") + "\n";
 84 |         		}
 85 |         	}
 86 |         	Log.i(TAG,jsonOutput);
 87 |         	textView.setText(contacts);
 88 | 		} catch (Exception e) {
 89 | 			Log.e(TAG, "Error executing request",e);
 90 | 			textView.setText("Error retrieving contacts : " + jsonOutput);
 91 | 		}
 92 | 	}
 93 | 	
 94 | 	public void onActivityResult(int reqCode, int resultCode, Intent data) {
 95 | 		  super.onActivityResult(reqCode, resultCode, data);
 96 | 
 97 | 		  switch (reqCode) {
 98 | 		    case (PICK_CONTACT) :
 99 | 		      if (resultCode == Activity.RESULT_OK) {
100 | 		        Uri contactData = data.getData();
101 | 		        Cursor c =  managedQuery(contactData, null, null, null, null);
102 | 		        if (c.moveToFirst()) {
103 | 		          String name = c.getString(c.getColumnIndexOrThrow(People.NAME));
104 | 		          Log.i(TAG,"Response : " + "Selected contact : " + name);
105 | 		        }
106 | 		      }
107 | 		      break;
108 | 		  }
109 | 		}	
110 | 	
111 |     private void clearCredentials() {
112 | 		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
113 | 		final Editor edit = prefs.edit();
114 | 		edit.remove(OAuth.OAUTH_TOKEN);
115 | 		edit.remove(OAuth.OAUTH_TOKEN_SECRET);
116 | 		edit.commit();
117 | 	}
118 | 
119 | 	
120 | 	private OAuthConsumer getConsumer(SharedPreferences prefs) {
121 | 		String token = prefs.getString(OAuth.OAUTH_TOKEN, "");
122 | 		String secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
123 | 		OAuthConsumer consumer = new CommonsHttpOAuthConsumer(Constants.CONSUMER_KEY, Constants.CONSUMER_SECRET);
124 | 		consumer.setTokenWithSecret(token, secret);
125 | 		return consumer;
126 | 	}
127 | 	
128 | 	private String doGet(String url,OAuthConsumer consumer) throws Exception {
129 | 		DefaultHttpClient httpclient = new DefaultHttpClient();
130 |     	HttpGet request = new HttpGet(url);
131 |     	Log.i(TAG,"Requesting URL : " + url);
132 |     	consumer.sign(request);
133 |     	HttpResponse response = httpclient.execute(request);
134 |     	Log.i(TAG,"Statusline : " + response.getStatusLine());
135 |     	InputStream data = response.getEntity().getContent();
136 |     	BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(data));
137 |         String responeLine;
138 |         StringBuilder responseBuilder = new StringBuilder();
139 |         while ((responeLine = bufferedReader.readLine()) != null) {
140 |         	responseBuilder.append(responeLine);
141 |         }
142 |         Log.i(TAG,"Response : " + responseBuilder.toString());
143 |         return responseBuilder.toString();
144 | 	}	
145 | }


--------------------------------------------------------------------------------