Facebook Android SDK 3.0登录按钮不会保存我的会话

Question

我正在尝试Facebook的Android SDK 3.0教程，但我面临一个问题。当我点击登录按钮并使用我的Facebook帐户登录时，我希望按照本教程（http://developers.facebook.com/docs/howtos/androidsdk/3.0/login-with-facebook/）所述的方式将我的按钮文本更改为注销，但未发生。我添加了日志，看看它是否通过onActivityResult，如this问题所示。这是我的日志：

MainFragment Unknown State: OPENING 
MainFragment onActivityResult 
MainFragment Logged out... 

请帮忙。我不知道我哪里错了，下一步该怎么办？

MainFragment.java

public class MainFragment extends Fragment{ 

    private static final String TAG = "MainFragment"; 
    private UiLifecycleHelper uiHelper; 
    private Session.StatusCallback callback = new Session.StatusCallback() { 
     @Override 
     public void call(Session session, SessionState state, Exception exception) { 
      onSessionStateChange(session, state, exception); 
     } 
    }; 

    private void onSessionStateChange(Session session, SessionState state, Exception exception) { 
     if (state.isOpened()) { 
      Log.i(TAG, "Logged in..."); 
     } else if (state.isClosed()) { 
      Log.i(TAG, "Logged out...");  
     } else { 
      Log.d(TAG, "Unknown state: " + state); 
     } 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     uiHelper = new UiLifecycleHelper(getActivity(), callback); 
     uiHelper.onCreate(savedInstanceState); 
    } 

    @Override 
    public void onResume() { 
     super.onResume(); 

     // For scenarios where the main activity is launched and user 
     // session is not null, the session state change notification 
     // may not be triggered. Trigger it if it's open/closed. 
     Session session = Session.getActiveSession(); 
     if (session != null && (session.isOpened() || session.isClosed())) { 
      onSessionStateChange(session, session.getState(), null); 
     } 

     uiHelper.onResume(); 
    } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     uiHelper.onActivityResult(requestCode, resultCode, data); 
     Log.d(TAG, "onActivityResult"); 
    } 

    @Override 
    public void onPause() { 
     super.onPause(); 
     uiHelper.onPause(); 
    } 

    @Override 
    public void onDestroy() { 
     super.onDestroy(); 
     uiHelper.onDestroy(); 
    } 

    @Override 
    public void onSaveInstanceState(Bundle outState) { 
     super.onSaveInstanceState(outState); 
     uiHelper.onSaveInstanceState(outState); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, 
      ViewGroup container, 
      Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.main, container, false);  

     LoginButton authButton = (LoginButton) view.findViewById(R.id.authButton); 
     authButton.setFragment(this);  

     return view; 
    } 
} 

MainActivity.java

public class MainActivity extends FragmentActivity { 

    private MainFragment mainFragment; 
    private static final String TAG = "MainActivity"; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     if (savedInstanceState == null) { 
      // Add the fragment on initial activity setup 
      mainFragment = new MainFragment(); 
      getSupportFragmentManager() 
      .beginTransaction() 
      .add(android.R.id.content, mainFragment) 
      .commit(); 
     } else { 
      // Or set the fragment from restored state info 
      mainFragment = (MainFragment) getSupportFragmentManager() 
      .findFragmentById(android.R.id.content); 
     } 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

} 

main.xml中

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

    <com.facebook.widget.LoginButton 
     android:id="@+id/authButton" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center_horizontal" 
     android:layout_marginTop="30dp" 
    /> 

</LinearLayout> 

Answer 1

我发现解决方案。 keytool的散列不适合我。我跟着卡里姆的answer，它为我工作。把它放在你的MainActivity的onCreate（）方法中，当然要改成你的包名。复制生成的哈希值并使用它来代替keytool的哈希值。

PackageInfo info = getPackageManager().getPackageInfo("<your_package_name>", PackageManager.GET_SIGNATURES); 

for (Signature signature : info.signatures) 
    { 
     MessageDigest md = MessageDigest.getInstance("SHA"); 
     md.update(signature.toByteArray()); 
     Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT)); 
    }