How to integrate facebook in Android

Registering your Facebook Application

After generating your app signature successfully, register your facebook application by going to create new facebook application and fill out all the information needed. And select Native Android App and give your hashkey there which you generated previously using keytool.

and note down your facebook App ID

Creating Facebook Reference Project

Once you are done with registering your facebook application, you need to download facebook SDK and create a new reference project. This reference project will be used to compile your actual project.

1. Download facebook android SDK from git repositories.
(git clone git://github.com/facebook/facebook-android-sdk.git)

2. In your Eclipse goto File ⇒ Import ⇒ Existing Projects into Workspace and select the facebook project you downloaded from git repository.

Creating Your Facebook Connect Project

1. Create new Project in your Eclipse IDE. File ⇒ New ⇒ Android Project and fill out all the details.

2. Now we need to add reference of this project to existing facebook project. Right Click on Project ⇒ Properties ⇒ android ⇒ Click on Add button ⇒ select your facebook project ⇒ Click Apply.

Now our project setup is done. We can start coding our facebook application.

3. Open your AndroidManifest.xml file add network connect permission in order to connect to internet.

<uses-permission android:name="android.permission.INTERNET"/>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.facebook.androidhive"     android:versionCode="1"     android:versionName="1.0" >       <uses-sdk android:minSdkVersion="8" />       <application         android:icon="@drawable/ic_launcher"         android:label="@string/app_name" >         <activity             android:label="@string/app_name"             android:name=".AndroidFacebookConnectActivity" >             <intent-filter >                 <action android:name="android.intent.action.MAIN" />                   <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application>       <!-- Connect to Internet Permissions -->     <uses-permission android:name="android.permission.INTERNET"/>   </manifest>

4. Open Your Main Activity Class and initialize all the variables needed.

public class AndroidFacebookConnectActivity extends Activity {       // Your Facebook APP ID     private static String APP_ID = "308180782571605"; // Replace your App ID here       // Instance of Facebook Class     private Facebook facebook;     private AsyncFacebookRunner mAsyncRunner;     String FILENAME = "AndroidSSO_data";     private SharedPreferences mPrefs;       @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);           facebook = new Facebook(APP_ID);         mAsyncRunner = new AsyncFacebookRunner(facebook);

5. I created a simple interface which contains button to login, post to wall, show access tokens and logout for testing purpose.

Login to Facebook Account

I used a button to login into facebook account. In your activity write a click event for Login button click. Inside click event declare a function named loginToFacebook();

Login button click event

btnFbLogin.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {             loginToFacebook();         } });

and function body for loginToFacebook() function is:

public void loginToFacebook() {     mPrefs = getPreferences(MODE_PRIVATE);     String access_token = mPrefs.getString("access_token", null);     long expires = mPrefs.getLong("access_expires", 0);       if (access_token != null) {         facebook.setAccessToken(access_token);     }       if (expires != 0) {         facebook.setAccessExpires(expires);     }       if (!facebook.isSessionValid()) {         facebook.authorize(this,                 new String[] { "email", "publish_stream" },                 new DialogListener() {                       @Override                     public void onCancel() {                         // Function to handle cancel event                     }                       @Override                     public void onComplete(Bundle values) {                         // Function to handle complete event                         // Edit Preferences and update facebook acess_token                         SharedPreferences.Editor editor = mPrefs.edit();                         editor.putString("access_token",                                 facebook.getAccessToken());                         editor.putLong("access_expires",                                 facebook.getAccessExpires());                         editor.commit();                     }                       @Override                     public void onError(DialogError error) {                         // Function to handle error                       }                       @Override                     public void onFacebookError(FacebookError fberror) {                         // Function to handle Facebook errors                       }                   });     } }