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copied!<p>You can try use my FBHelper class.</p> <pre><code>public class FBHelper { private SharedPreferences mPrefs; private Context context; private final String ACCES_TOKEN = "access_token"; private final String ACCES_EXPIRES = "access_expires"; private Facebook facebook; private FBHelperCallbacks callback; public FBHelper(Context context, Facebook facebook) { this.context = context; this.facebook = facebook; } public void setSignInFinishListener(FBHelperCallbacks callback) { this.callback = callback; } public void FacebookSingleSignIn() { mPrefs = ((Activity)context).getPreferences(Context.MODE_PRIVATE); String access_token = mPrefs.getString(ACCES_TOKEN, null); long expires = mPrefs.getLong(ACCES_EXPIRES, 0); if(access_token != null) { facebook.setAccessToken(access_token); } if(expires != 0) { facebook.setAccessExpires(expires); } /* * Only call authorize if the access_token has expired. */ if(!facebook.isSessionValid()) { Log.i("Facebook","Facebook session is not valid based on acces token... authorizing again"); facebook.authorize((Activity)context, new String[] {"user_about_me"},new DialogListener() { @Override public void onFacebookError(FacebookError e) { e.printStackTrace(); callback.onError(e.toString()); } @Override public void onError(DialogError e) { Log.i("Facebook","onError inner"); callback.onError(e.toString()); } @Override public void onComplete(Bundle values) { SharedPreferences.Editor editor = mPrefs.edit(); editor.putString(ACCES_TOKEN, facebook.getAccessToken()); Log.i("Facebook","Saving acces token:"+facebook.getAccessToken()); editor.putLong(ACCES_EXPIRES, facebook.getAccessExpires()); editor.commit(); callback.onSignedInFinished(facebook.getAccessToken()); } @Override public void onCancel() { callback.onError("onCancel"); } }); } else { Log.i("Facebook","Accces token read form preferencesno no need to authorize"); callback.onSignedInFinished(facebook.getAccessToken()); } } public String LogOut() { try { //set ACCES_TOKEN to null mPrefs = ((Activity)context).getPreferences(Context.MODE_PRIVATE); SharedPreferences.Editor editor = mPrefs.edit(); editor.putString(ACCES_TOKEN, null); editor.putLong(ACCES_EXPIRES, 0); editor.commit(); return facebook.logout(context); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "Error"; } public static abstract class FBHelperCallbacks{ public abstract void onSignedInFinished(String accesToken); public abstract void onError(String message); } } </code></pre> <p>This is how you use this class.</p> <pre><code>public class LogInActivity extends Activity { private static final String TAG = "LogInActivity"; public static final int REQUEST_CODE = 1; private Context context; private Facebook facebook; private FBHelper fbhelper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_log_in); this.context = this; Handler pauser = new Handler(); pauser.postDelayed (new Runnable() { public void run() { facebook = new Facebook(context.getString(R.string.FACEBOOK_APP_ID)); fbhelper = new FBHelper(context, facebook); if (aHelper.isLogedIn()) { //log out fbhelper.LogOut(); } else { //facebook login fbhelper.setSignInFinishListener(fbcallback); fbhelper.FacebookSingleSignIn(); } } }, 100); } FBHelperCallbacks fbcallback = new FBHelperCallbacks() { @Override public void onSignedInFinished(String accesToken) { Log.d(TAG,"log in finish"); } @Override public void onError(String message) { setResult(RESULT_CANCELED); finish(); } }; @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { facebook.authorizeCallback(requestCode, resultCode, data); } } </code></pre> <p>aHelper is object that hold some application specific data. Basically you should decide here if you want to log in or log out.</p>

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