安卓LinkedIn抄寫API獲得空指針異常

Question

我用抄寫API與LinkedIn 集成了問題，我得到NPE，代碼中遇到：

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.linkedin_list); 

    mContext = this; 

    mConnections = new ArrayList<String>(); 

    // List and adapter 
    mLinkedInList = (ListView) findViewById(R.id.linkedInList); 
    mLinkedInListAdapter = new LinkedInAdapter(this, mContext, mConnections);   
    mLinkedInList.setAdapter(mLinkedInListAdapter);  

    // Start async task to get connections 
    LinkedInConnectionsTask task = new LinkedInConnectionsTask(); 
    task.execute(); 
} 

的AsyncTask：

private class LinkedInConnectionsTask extends AsyncTask<Void, Void, String> { 

    private String LINKED_IN_CONNECTIONS_API =  "http://api.linkedin.com/v1/people/~/connections"; 

    @Override 
    protected String doInBackground(Void... arg) { 

     String urlStr = LINKED_IN_CONNECTIONS_API; 
     urlStr += "?format=json"; 

     SharedPreferences prefs =   PreferenceManager.getDefaultSharedPreferences(mContext); 
      String access_token = prefs.getString("linkedin_access_token", null); 
      String access_secret = prefs.getString("linkedin_access_secret", null); 



     if (access_token != null && access_secret != null) { 
      OAuthService linkedInService = new ServiceBuilder() 
      .provider(LinkedInApi.class) 
      .apiKey(LinkedInOAuthActivity.APIKEY) 
      .apiSecret(LinkedInOAuthActivity.APISECRET) 
      .scope("r_basicprofile") 
      .scope("rw_nus") 
      .callback(LinkedInOAuthActivity.CALLBACK) 
      .build(); 

      OAuthRequest request = new OAuthRequest(Verb.GET, urlStr); 


      Token t = new Token(access_token, access_secret); 
      linkedInService.signRequest(t, request); 

      Response response = null; 
      try { 
       response = request.send(); 
       if (response.isSuccessful()) 
        return response.getBody(); 
       else 
        return null; 
      } 
      catch (Exception e) { 
       e.printStackTrace(); 
       return null; 
      } 
     } 
     else { 
      return null; 
     }    
    } 

    @Override 
    protected void onPostExecute(String result) { 
     JSONArray arr = null; 
     JSONObject object = null; 

     try { 
      object = new JSONObject(result); 
      if (object.has("values")) { 
       arr = object.getJSONArray("values"); 
      } 
      else { 
       return; 
      } 
     } catch (JSONException e1) { 
      e1.printStackTrace(); 
      return; 
     } 

     JSONObject jsonObject = null; 
     for (int i = 0; i < arr.length(); i++) { 
      try { 
       jsonObject = arr.getJSONObject(i); 
      } catch (JSONException e1) { 
       e1.printStackTrace(); 
      } 

      try {  
       String fn = jsonObject.getString("firstName"); 
       String ln = jsonObject.getString("lastName"); 
       mLinkedInListAdapter.add(fn + " " + ln); 
      } 
      catch (JSONException e1) { 
       e1.printStackTrace(); 
      } 
     } 

     mLinkedInListAdapter.notifyDataSetChanged(); 
    } 
} 

越來越NPE在：

response = request.send(); 

錯誤日誌：

05-22 13:18:33.559: E/AndroidRuntime(4979): FATAL EXCEPTION: main 
05-22 13:18:33.559: E/AndroidRuntime(4979): java.lang.NullPointerException 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at  

    org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at org.json.JSONTokener.nextValue(JSONTokener.java:94) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at org.json.JSONObject.<init>(JSONObject.java:154) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at org.json.JSONObject.<init>(JSONObject.java:171) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at com.sourcetricks.myconnections.LinkedInListActivity$LinkedInConnectionsTask.onPostExecute(LinkedInListActivity.java:164) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at com.sourcetricks.myconnections.LinkedInListActivity$LinkedInConnectionsTask.onPostExecute(LinkedInListActivity.java:1) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at android.os.AsyncTask.finish(AsyncTask.java:631) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at android.os.AsyncTask.access$600(AsyncTask.java:177) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at android.os.Handler.dispatchMessage(Handler.java:99) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at android.os.Looper.loop(Looper.java:137) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at android.app.ActivityThread.main(ActivityThread.java:4898) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at java.lang.reflect.Method.invoke(Method.java:511) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 
05-22 13:18:33.559: E/AndroidRuntime(4979):  at dalvik.system.NativeStart.main(Native Method) 

如果有人能幫忙，我們將不勝感激。我做錯了什麼可能會錯過一些東西。 謝謝

Answer 1

找到了答案。 必須在OAuth的用戶協議使r_basicprofile 如果有人需要完整的例子到Android與LinkedIn整合，並得到例如連接參見tutorial