如何在android中的活動中從facebook sdk獲取用戶數據？

Question

過去幾天我一直在Facebook SDK上工作。我一直在關注Facebook.com的開發者指南。但是我無法獲取我的代碼中的數據。

在這裏我粘貼我的代碼。我正在做一件事，而不是一件碎片。

public class MainActivity extends Activity { 
    private static final String TAG = "FacebookConnect"; 
    LoginButton loginButton; 
    private boolean isLoggedIn = false; // by default assume not logged in 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     if (isLoggedIn()) { 

      startActivity(new Intent(MainActivity.this, SecondActivity.class)); 
      finish(); 
     } 

     loginButton = (LoginButton) findViewById(R.id.authB); 
     loginButton.setReadPermissions(Arrays.asList("user_likes", 
       "user_status", "user_location", "email", "user_birthday")); 

     try { 
      PackageInfo info = getPackageManager().getPackageInfo(
        "com.can.fun", 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)); 
      } 
     } catch (NameNotFoundException e) { 

     } catch (NoSuchAlgorithmException e) { 

     } 

     Session.StatusCallback callback = new Session.StatusCallback() { 
      @Override 
      public void call(Session session, SessionState state, 
        Exception exception) { 
       Toast.makeText(getBaseContext(), "hello", Toast.LENGTH_LONG) 
         .show(); 
       onSessionStateChange(session, state, exception); 
      } 
     }; 

    } 

    private void onSessionStateChange(Session session, SessionState state, 
      Exception exception) { 
     if (state.isOpened()) { 
      // Get the user's data. 

      // Request user data and show the results 
      Request.newMeRequest(session, new Request.GraphUserCallback() { 

       // callback after Graph API response with user object 
       @Override 
       public void onCompleted(GraphUser user, Response response) { 
        Toast.makeText(getBaseContext(), "hello3", 
          Toast.LENGTH_LONG).show(); 
        if (user != null) { 
         // Display the parsed user info 
         Toast.makeText(getBaseContext(), 
           "" + buildUserInfoDisplay(user), 
           Toast.LENGTH_LONG).show(); 

         Log.d("User Data", "" + buildUserInfoDisplay(user)); 
        } 
       } 
      }).executeAsync(); 

     } else if (session.isOpened()) { 
     } 
    } 

    public boolean isLoggedIn() { 
     Session session = Session.getActiveSession(); 
     return (session != null && session.isOpened()); 
    } 

    private String buildUserInfoDisplay(GraphUser user) { 
     StringBuilder userInfo = new StringBuilder(""); 

     // Example: typed access (name) 
     // - no special permissions required 
     userInfo.append(String.format("Name: %s\n\n", user.getName())); 

     // Example: typed access (birthday) 
     // - requires user_birthday permission 
     userInfo.append(String.format("Birthday: %s\n\n", user.getBirthday())); 

     // Example: partially typed access, to location field, 
     // name key (location) 
     // - requires user_location permission 
     userInfo.append(String.format("Location: %s\n\n", user.getLocation() 
       .getProperty("name"))); 

     // Example: access via property name (locale) 
     // - no special permissions required 
     userInfo.append(String.format("Locale: %s\n\n", 
       user.getProperty("locale"))); 

     // Example: access via key for array (languages) 
     // - requires user_likes permission 
     JSONArray languages = (JSONArray) user.getProperty("languages"); 
     if (languages.length() > 0) { 
      ArrayList<String> languageNames = new ArrayList<String>(); 
      for (int i = 0; i < languages.length(); i++) { 
       JSONObject language = languages.optJSONObject(i); 
       // Add the language name to a list. Use JSON 
       // methods to get access to the name field. 
       languageNames.add(language.optString("name")); 
      } 
      userInfo.append(String.format("Languages: %s\n\n", 
        languageNames.toString())); 
     } 

     return userInfo.toString(); 
    } 

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

    } 

} 

請告訴我我要去哪裏錯了。

Answer 1

確保：

您是否正確產生的APP-ID與OpenSSL和在應用程序清單中聲明它。

2.應用程序包名稱和應用程序ID已正確輸入您的Facebook應用程序詳細信息頁面。

3.您已申請相關權限並從FB處獲得。

4.訪問令牌有效（即非空）。

5.訪問令牌的會話狀態是OPENED。

6.你在叫你Session.onActivityResult()Activity/Fragment的onActivityResult()。