Facebook 3.0登录问题

Question

我试图了解Facebook 3.0 SDK登录过程如何工作。 我走过this教程。每件事情都很好，但我应该如何继续？可以说，登录后我想获取用户电子邮件或导航到其他活动。 在这种情况下，我应该在哪里放置我的代码。我有这样的MainActivity代码：

package com.shaleapp.activities; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.util.Log; 
import android.view.Menu; 
import android.widget.TextView; 

import com.facebook.Request; 
import com.facebook.Response; 
import com.facebook.Session; 
import com.facebook.SessionState; 
import com.facebook.model.GraphUser; 
import com.parse.ParseFacebookUtils; 
import com.shale.fragments.MainFragment; 
import com.shaleapp.services.Init; 
import com.shaleapp.shale.R; 

public class MainActivity extends FragmentActivity { 
    private MainFragment mainFragment; 


    @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 void onActivityResult(int requestCode, int resultCode, Intent data) { 
      super.onActivityResult(requestCode, resultCode, data); 
      Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data); 
      //ParseFacebookUtils.finishAuthentication(requestCode, resultCode, data); 
     } 

    @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; 
    } 

} 

这MainFragment代码：

package com.shale.fragments; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 

import com.facebook.Session; 
import com.facebook.SessionState; 
import com.facebook.UiLifecycleHelper; 
import com.facebook.widget.LoginButton; 
import com.shaleapp.shale.R; 

public class MainFragment extends Fragment { 
    private static final String TAG = "MainFragment"; 
    private UiLifecycleHelper uiHelper; 

    @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; 
    } 

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

    private Session.StatusCallback callback = new Session.StatusCallback() { 
     @Override 
     public void call(Session session, SessionState state, Exception exception) { 
      onSessionStateChange(session, state, exception); 
     } 
    }; 

    @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); 
    } 

    @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); 
    } 


} 

我试图调试，但找不到其中MainFragment会话或其他物体返回到在MainActivity点

Answer 1

登录后，FB屏幕打开后，它会去onActivityResult。
此外，当会话状态发生变化时，您可以在Session.StatusCallback之内找到它。
查看SessionState
的所有值，如果您有异常，您也可以在那里收到。
如果你会更具体，我将能够回答更多细节。