Facebook 4.x登录SDK未完成登录过程

Question

我正在关注此tutorial并且它正在工作，但现在当我单击登录按钮时，我会看到一个进度微调器出现一会儿，然后消失。我试图调试，我还没有打这个回调：

private FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() { 
     @Override 
     public void onSuccess(LoginResult loginResult) { 
      AccessToken accessToken = loginResult.getAccessToken(); 
      Profile profile = Profile.getCurrentProfile(); 
      displayMessage(profile); 
     } 

     @Override 
     public void onCancel() { 

     } 

     @Override 
     public void onError(FacebookException e) { 

     } 
    }; 

下面是完整的代码：

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

import com.facebook.AccessToken; 
import com.facebook.AccessTokenTracker; 
import com.facebook.CallbackManager; 
import com.facebook.FacebookCallback; 
import com.facebook.FacebookException; 
import com.facebook.FacebookSdk; 
import com.facebook.Profile; 
import com.facebook.ProfileTracker; 
import com.facebook.login.LoginResult; 
import com.facebook.login.widget.LoginButton; 


import static com.facebook.FacebookSdk.getApplicationContext; 


/** 
* A placeholder fragment containing a simple view. 
*/ 
public class MainActivityFragment extends Fragment { 
    private CallbackManager callbackManager; 
    private TextView displayName; 

    private AccessTokenTracker accessTokenTracker; 
    private ProfileTracker profileTracker; 

    private FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() { 
     @Override 
     public void onSuccess(LoginResult loginResult) { 
      AccessToken accessToken = loginResult.getAccessToken(); 
      Profile profile = Profile.getCurrentProfile(); 
      displayMessage(profile); 
     } 

     @Override 
     public void onCancel() { 

     } 

     @Override 
     public void onError(FacebookException e) { 

     } 
    }; 



    public MainActivityFragment() { 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 
     FacebookSdk.sdkInitialize(getActivity().getApplicationContext()); 

     callbackManager = CallbackManager.Factory.create(); 

     accessTokenTracker = new AccessTokenTracker() { 
      @Override 
      protected void onCurrentAccessTokenChanged(AccessToken accessToken, AccessToken accessToken1) { 

      } 
     }; 

     profileTracker = new ProfileTracker() { 
      @Override 
      protected void onCurrentProfileChanged(Profile oldProfile, Profile newProfile) { 
       displayMessage(newProfile); 
      } 
     }; 

     accessTokenTracker.startTracking(); 
     profileTracker.startTracking(); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 

     return inflater.inflate(R.layout.fragment_main, container, false); 
    } 

    @Override 
    public void onViewCreated(View view, Bundle savedInstanceState){ 
     super.onViewCreated(view, savedInstanceState); 
     LoginButton loginButton = (LoginButton) view.findViewById(R.id.login_button); 
     displayName = (TextView) view.findViewById(R.id.displayName); 

     loginButton.setReadPermissions("user_friends"); 
     loginButton.setFragment(this); 
     loginButton.registerCallback(callbackManager, callback); 
    } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     callbackManager.onActivityResult(requestCode, resultCode, data); 

    } 

    private void displayMessage(Profile profile){ 
     if(profile != null){ 
      displayName.setText(profile.getName()); 
     } 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 
     accessTokenTracker.stopTracking(); 
     profileTracker.stopTracking(); 
    } 

    @Override 
    public void onResume() { 
     super.onResume(); 
     Profile profile = Profile.getCurrentProfile(); 
     displayMessage(profile); 
    } 


} 

Answer 1

事实证明，这个问题是由在没有我的uses-permission引起正确的地方。我不知道为什么这会让应用程序工作一两次，但它确实如此。我必须让我的清单看起来像：

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="my.app" > 

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

之前，它看起来像：

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="my.app" > 


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