Facebook登錄和發佈錯誤

Question

我試圖通過點擊下面的代碼崩潰的一個button.the顯示登錄頁面時，並顯示錯誤上發佈的Facebook牆上的樣本消息：

05-07 20:22 ：39.843：E/AndroidRuntime（810）：java.lang.NullPointerException 05-07 20：22：39.843：E/AndroidRuntime（810）：at com.facebook.android.SessionStore.save（SessionStore.java:33） 05-07 20：22：39.843：E/AndroidRuntime（810）：at com.test.fb.TestPost $ FbLoginDialogListener.onComplete（TestPost.java:116） 05-07 20：22：39.843：E/AndroidRuntime（810 ）：at com.facebook.android.Facebook $ 1.onComplete（Facebook.java:308） 05-07 20：22：3 9.843：E/AndroidRuntime（810）：at com.facebook.android.FbDialog $ FbWebViewClient.shouldOverrideUrlLoading（FbDialog.java:125）

任何幫助appriciated。 感謝

package com.test.fb; 

import org.json.JSONObject; 
import org.json.JSONTokener; 

import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 

import android.app.Activity; 
import android.app.ProgressDialog; 

import android.view.View; 
import android.view.View.OnClickListener; 

import android.widget.Button; 
import android.widget.Toast; 

import com.facebook.android.AsyncFacebookRunner; 
import com.facebook.android.BaseRequestListener; 
import com.facebook.android.DialogError; 
import com.facebook.android.Facebook; 
import com.facebook.android.FacebookError; 
import com.facebook.android.SessionStore; 
import com.facebook.android.Facebook.DialogListener; 


public class TestPost extends Activity{ 
    private TestPost _activity; 
    private Facebook mFacebook; 
    private ProgressDialog mProgress; 

    private Handler mRunOnUi = new Handler(); 
    private static final String[] PERMISSIONS = new String[] {"publish_stream", "read_stream", "offline_access"}; 
    private static final String APP_ID = "331862293507865"; 

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

     setContentView(R.layout.main); 

     //final EditText reviewEdit = (EditText) findViewById(R.id.revieew); 
     //mFacebookCb     = (CheckBox) findViewById(R.id.cb_facebook); 

     mProgress = new ProgressDialog(this); 
     mFacebook = new Facebook(APP_ID); 
     SessionStore.restore(mFacebook, this); 


     ((Button) findViewById(R.id.button1)).setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
       if(mFacebook.isSessionValid()){ 

       String review = "Sample post"; 

       if (review.equals("")) 
        return; 
       postToFacebook(review); 
       } 
       else{ 
        onFacebookClick(); 
       } 
      } 
     }); 
    } 

    private void onFacebookClick() { 
     if (mFacebook.isSessionValid()) { 
      postToFacebook(null); 
       } else { 
      mFacebook.authorize(this, PERMISSIONS, -1, new FbLoginDialogListener()); 
     } 
    } 
    private void postToFacebook(String review) {  
     mProgress.setMessage("Posting ..."); 
     mProgress.show(); 

     AsyncFacebookRunner mAsyncFbRunner = new AsyncFacebookRunner(mFacebook); 

     Bundle params = new Bundle(); 

     params.putString("message", review); 
     params.putString("name", "Dexter"); 
     params.putString("caption", "londatiga.net"); 
     params.putString("link", "http://www.londatiga.net"); 
     params.putString("description", "Dexter, seven years old dachshund who loves to catch cats, eat carrot and krupuk"); 
     params.putString("picture", "http://twitpic.com/show/thumb/6hqd44"); 

     mAsyncFbRunner.request("me/feed", params, "POST", new WallPostListener()); 
    } 

    private final class WallPostListener extends BaseRequestListener { 
     public void onComplete(final String response) { 
      mRunOnUi.post(new Runnable() { 

       public void run() { 
        mProgress.cancel(); 

        Toast.makeText(TestPost.this, "Posted to Facebook", Toast.LENGTH_SHORT).show(); 
       } 
      }); 
     } 
    } 

    private final class FbLoginDialogListener implements DialogListener { 
     public void onComplete(Bundle values) { 
      SessionStore.save(mFacebook, _activity); 
      getFbName(); 
     } 

     public void onFacebookError(FacebookError error) { 

     } 

     public void onError(DialogError error) { 

     } 

     public void onCancel() { 

     } 
    } 
    private void getFbName() { 
     mProgress.setMessage("Finalizing ..."); 
     mProgress.show(); 

     new Thread() { 
      @Override 
      public void run() { 
       String name = ""; 
       int what = 1; 

       try { 
        String me = mFacebook.request("me"); 

        JSONObject jsonObj = (JSONObject) new JSONTokener(me).nextValue(); 
        name = jsonObj.getString("email"); 
        what = 0; 
       } catch (Exception ex) { 
        ex.printStackTrace(); 
       } 

       mFbHandler.sendMessage(mFbHandler.obtainMessage(what, name)); 
      } 
     }.start(); 
    } 

    private Handler mFbHandler = new Handler() { 
     @Override 
     public void handleMessage(Message msg) { 
      mProgress.dismiss(); 

      if (msg.what == 0) { 
       String username = (String) msg.obj; 
       username = (username.equals("")) ? "No Name" : username; 

       SessionStore.saveName(username, _activity); 

      } else { 
       Toast.makeText(_activity, "Connected to Facebook", Toast.LENGTH_SHORT).show(); 
      } 
     } 
    }; 
} 

Answer 1

在的onComplete方法，你要保存會話：

SessionStore.save(mFacebook, _activity); 

的問題，我認爲，是你沒有分配任何價值的「_activity」參數（在您發佈的代碼中），因此它爲空。

無論如何，這個變量有什麼意義？如果它是從私人類訪問活動實例，那麼你可以嘗試：

SessionStore.save(mFacebook, TestPost.this);