android facebook上的SSO

我已经在android上开发了一个facebook应用程序。我的设备有默认的android facebook应用程序。当我运行我的应用程序时，如果我输入凭据，默认的fb也会登录。当我注销我的应用程序时，默认应用程序不会注销。那么，我怎样才能从我的应用程序中获得注销默认fb呢。我也用过SSO。但还是有同样的问题

我的代码：

public class SampleApp extends Activity {

// Set Application ID to your registered app client_id
// See http://www.facebook.com/developers/createapp.php
public static final String APP_ID = "APP ID";

private static final String[] PERMISSIONS = new String[] {
        "publish_stream", "read_stream", "offline_access" };
private TextView mText;
private Handler mHandler = new Handler();

private Facebook mFacebook;
private AsyncFacebookRunner mAsyncRunner;
byte[] raw;
private SharedPreferences mPrefs;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Make sure the app client_app has been set
    if (APP_ID == null) {
        Util.showAlert(this, "Warning",
                "Facebook Applicaton ID must be set...");
    }

    // Initialize the content view
    setContentView(R.layout.main);
    // Get the status text line resource
    mText = (TextView) SampleApp.this.findViewById(R.id.txt);

    // Setup the ListView Adapter that is loaded when selecting
    // "get friends"

    // Define a spinner used when loading the friends over the network

    // Initialize the Facebook session
    mFacebook = new Facebook(APP_ID);
    mAsyncRunner = new AsyncFacebookRunner(mFacebook);

    mPrefs = getPreferences(MODE_PRIVATE);
    String access_token = mPrefs.getString("access_token", null);
    long expires = mPrefs.getLong("access_expires", 0);
    if (access_token != null) {
        mFacebook.setAccessToken(access_token);
    }
    if (expires != 0) {
        mFacebook.setAccessExpires(expires);
    }

}

// ////////////////////////////////////////////////////////////////////

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Log.d("FB Sample App", "onActivityResult(): " + requestCode);
    mFacebook.authorizeCallback(requestCode, resultCode, data);
}



private class LogoutRequestListener implements RequestListener {

    /** Called when the request completes w/o error */
    public void onComplete(String response) {

        // Only the original owner thread can touch its views
        SampleApp.this.runOnUiThread(new Runnable() {
            public void run() {
                mText.setText("Thanks for using FB Sample App. Bye bye...");

            }
        });

        // Dispatch on its own thread
        mHandler.post(new Runnable() {
            public void run() {
            }
        });
    }



    @Override
    public void onComplete(String response, Object state) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onIOException(IOException e, Object state) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onFileNotFoundException(FileNotFoundException e,
            Object state) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onMalformedURLException(MalformedURLException e,
            Object state) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onFacebookError(FacebookError e, Object state) {
        // TODO Auto-generated method stub

    }

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main_menu, menu);
    return true;
}


@Override
public boolean onPrepareOptionsMenu(Menu menu) {

    MenuItem loginItem = menu.findItem(R.id.login);

    if (mFacebook.isSessionValid()) {
        loginItem.setTitle("Logout");


    } else {
        loginItem.setTitle("Login");


    }
    loginItem.setEnabled(true);
    return super.onPrepareOptionsMenu(menu);
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {

    // Login/logout toggle
    case R.id.login:

        if (!mFacebook.isSessionValid()) {

            mFacebook.authorize(this, new DialogListener() {
                @Override
                public void onComplete(Bundle values) {
                    Log.v("Entered ", "No ERRRRRRRRRRRR");
                    SharedPreferences.Editor editor = mPrefs.edit();
                    editor.putString("access_token",
                            mFacebook.getAccessToken());
                    editor.putLong("access_expires",
                            mFacebook.getAccessExpires());
                    editor.commit();
                    Intent i=new Intent(SampleApp.this,second.class);
                    startActivity(i);
                }

                @Override
                public void onFacebookError(FacebookError error) {
                }

                @Override
                public void onError(DialogError e) {
                }


                public void onCancel() {
                }
            });
        }else{

            mFacebook.setAccessToken(null);
            mFacebook.setAccessExpires(0);

            AsyncFacebookRunner asyncRunner = new AsyncFacebookRunner(mFacebook);
             asyncRunner.logout(this.getBaseContext(), new  LogoutRequestListener());
        }

        break;


    default:
        return false;

    }
    return true;
}

}
}

---

据我所知，SSO没有实现单一注销…我有理由相信你的应用程序无法将用户注销facebookapp@lgy有没有理由不使用此功能？为什么要将用户从其他人的应用程序中注销？这似乎是恶意的。使用SSO，你可以“背负”已经登录的facebook应用程序，但我非常怀疑是否有人会编写代码让你的用户退出他们的应用程序，仅仅因为你想让他们退出你的应用程序。据我所知，SSO没有实现单点注销…我有理由相信你的应用程序无法将用户注销facebookapp@lgy有没有理由不使用此功能？为什么要将用户从其他人的应用程序中注销？这似乎是恶意的。使用SSO，你可以“背驮”已经登录的facebook应用程序，但我高度怀疑是否有人会因为你想让你的用户注销你的应用程序而编写代码让你的用户注销他们的应用程序。