執行http請求的空例外Android

我有一個空的異常執行此代碼，在「執行」操作，我不明白爲什麼，你可以請我嗎？在這裏我的代碼retreive地址爲：「routeslibre.fr/connexion.php?variable=Departement ;;; voie ;;;」並將其提供給http操作：執行。在這個操作中，一個異常是具有空值的throw，我不明白原因....？謝謝你幫助我！執行http請求的空例外Android

mydataFromHMI = dataFromHMI; 
    myFichierPHPbase = FichierPHPbase; 

    String result = null; 
    InputStream is = null; 
    JSONObject json_data=null; 

    try{ 
     GestionStrings gestionString = new GestionStrings(); 
     splitData = mydataFromHMI.split(";;;"); 
     mydataFromHMI = gestionString.blancTraitement(splitData[0]) 
       + ";;;" 
       + gestionString.blancTraitement(splitData[1]) 
       + ";;;"; 
     String httpRequest = new String("http://routeslibre.fr/"+ myFichierPHPbase + "?variable=" + mydataFromHMI); 
     HttpGet httpGet = new HttpGet(httpRequest); 
     HttpParams httpParameters = new BasicHttpParams(); 
     // Set the timeout in milliseconds until a connection is established. 
     // The default value is zero, that means the timeout is not used. 
     int timeoutConnection = 3000; 
     HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); 
     // Set the default socket timeout (SO_TIMEOUT) 
     // in milliseconds which is the timeout for waiting for data. 
     int timeoutSocket = 5000; 
     HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); 
     HttpClient httpclient = new DefaultHttpClient(httpParameters); 
     HttpResponse response = httpclient.execute(httpGet); 

     //If you get the value of response code as 200 then you are getting data from server and 
     //if the response code value >=300 then you have error at your server side. 
     //int test = response.getStatusLine().getStatusCode(); 

     HttpEntity entity = response.getEntity(); 
     is = entity.getContent(); 
    } 
    catch(Exception e){ 
     Log.i("taghttppost",""+e.toString()); 
     isProblemConnexion = true; 
    }

日誌是：

` 08-02 19:58:57.959: I/dalvikvm-heap(7640): Grow heap (frag case) to 15.421MB for 1647516-byte allocation 
08-02 19:58:58.089: I/webclipboard(7640): clipservice: [email protected] 
08-02 19:58:58.164: I/webclipboard(7640): clipservice: [email protected] 
08-02 19:58:58.174: E/SKIA(7640): FimgApiStretch:stretch failed 
08-02 19:58:58.324: I/webclipboard(7640): clipservice: [email protected] 
08-02 19:58:58.364: I/Ads(7640): To get test ads on this device, call adRequest.addTestDevice("1CA948FD73C51AEDDBB30790A88E0DBC"); 
08-02 19:58:58.514: I/Ads(7640): adRequestUrlHtml: <html><head><script src="http://media.admob.com/sdk-core-v40.js"></script><script>AFMA_getSdkConstants();AFMA_buildAdURL({"kw":["voiture moto velo bus trameway tram train greve carte geolocalisation"],"preqs":0,"session_id":"10528273920811926641","u_sd":2,"seq_num":"1","slotname":"a15007f67ec6dea","u_w":360,"msid":"free.controls.source","js":"afma-sdk-a-v6.0.1","mv":"8013015.com.android.vending","isu":"1CA948FD73C51AEDDBB30790A88E0DBC","cipa":1,"format":"320x50_mb","net":"ed","app_name":"4.android.free.controls.source","hl":"fr","u_h":640,"carrier":"20820","ptime":0,"u_audio":1});</script></head><body></body></html> 
08-02 19:59:02.174: I/taghttppost(7640): org.apache.http.client.ClientProtocolException 
08-02 19:59:02.174: I/tagconvertstr(7640): java.lang.NullPointerException 
08-02 19:59:02.179: I/connexions(7640): java.util.concurrent.ExecutionException: java.lang.NullPointerException 
08-02 19:59:02.179: W/dalvikvm(7640): threadid=19: thread exiting with uncaught exception (group=0x40c661f8) 
08-02 19:59:02.194: E/AndroidRuntime(7640): FATAL EXCEPTION: AsyncTask #2 
08-02 19:59:02.194: E/AndroidRuntime(7640): java.lang.RuntimeException: An error occured while executing doInBackground() 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at android.os.AsyncTask$3.done(AsyncTask.java:278) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.lang.Thread.run(Thread.java:856) 
08-02 19:59:02.194: E/AndroidRuntime(7640): Caused by: java.lang.NullPointerException 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at org.json.JSONTokener.nextValue(JSONTokener.java:94) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at org.json.JSONArray.<init>(JSONArray.java:87) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at org.json.JSONArray.<init>(JSONArray.java:103) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at free.controls.source.clien.ConnexionSQL.ConnexionBD(ConnexionSQL.java:213) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at free.controls.source.clien.ConnexionSQL.doInBackground(ConnexionSQL.java:76) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at free.controls.source.clien.ConnexionSQL.doInBackground(ConnexionSQL.java:1) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at android.os.AsyncTask$2.call(AsyncTask.java:264) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
08-02 19:59:02.194: E/AndroidRuntime(7640):  ... 5 more 
08-02 19:59:02.339: E/WindowManager(7640): Activity free.controls.source.forum.ForumActivity has leaked window [email protected] that was originally added here 
08-02 19:59:02.339: E/WindowManager(7640): android.view.WindowLeaked: Activity free.controls.source.forum.ForumActivity has leaked window [email protected] that was originally added here 
08-02 19:59:02.339: E/WindowManager(7640): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:414) 
08-02 19:59:02.339: E/WindowManager(7640): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:282) 
08-02 19:59:02.339: E/WindowManager(7640): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:218) 
08-02 19:59:02.339: E/WindowManager(7640): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:143) 
08-02 19:59:02.339: E/WindowManager(7640): at android.view.Window$LocalWindowManager.addView(Window.java:547) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.Dialog.show(Dialog.java:278) 
08-02 19:59:02.339: E/WindowManager(7640): at free.controls.source.clien.ConnexionSQL.onPreExecute(ConnexionSQL.java:84) 
08-02 19:59:02.339: E/WindowManager(7640): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561) 
08-02 19:59:02.339: E/WindowManager(7640): at android.os.AsyncTask.execute(AsyncTask.java:511) 
08-02 19:59:02.339: E/WindowManager(7640): at free.controls.source.forum.ForumActivity.onCreate(ForumActivity.java:78) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.Activity.performCreate(Activity.java:4533) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.ActivityThread.access$600(ActivityThread.java:128) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161) 
08-02 19:59:02.339: E/WindowManager(7640): at android.os.Handler.dispatchMessage(Handler.java:99) 
08-02 19:59:02.339: E/WindowManager(7640): at android.os.Looper.loop(Looper.java:137) 
08-02 19:59:02.339: E/WindowManager(7640): at android.app.ActivityThread.main(ActivityThread.java:4517) 
08-02 19:59:02.339: E/WindowManager(7640): at java.lang.reflect.Method.invokeNative(Native Method) 
08-02 19:59:02.339: E/WindowManager(7640): at java.lang.reflect.Method.invoke(Method.java:511) 
08-02 19:59:02.339: E/WindowManager(7640): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993) 
08-02 19:59:02.339: E/WindowManager(7640): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760) 
08-02 19:59:02.339: E/WindowManager(7640): at dalvik.system.NativeStart.main(Native Method) 
08-02 19:59:03.464: I/GATE(7640): <GATE-M>DEV_ACTION_COMPLETED</GATE-M>`

來源

2012-08-02 user1106464

安置自己的logcat使SO知道什麼是錯。 – Nerd 2012-08-02 17:57:25

在代碼被調用之前你在做什麼？ – 2012-08-02 18:52:04

我通過異步任務調用它：此代碼位於AsyncTask – user1106464 2012-08-02 19:21:57

退房你的java文件ConnexionSQL.java在行213，空指針異常是從該行生成。

來源

2012-08-02 19:59:03 ashutosh

首先，非常感謝幫助我，但是這條線沒有出現錯誤，因爲之前出現了第一個錯誤，此行會引發異常。此外，第一個錯誤是在執行操作期間在169行中啓動（在調試器中），但我不知道爲什麼.... – user1106464 2012-08-02 20:25:02

從該行未來的錯誤：

HttpGet httpGet = new HttpGet(httpRequest);

我改變了它的這一個：

HttpPost request = new HttpPost(httpRequest);

來源

2012-08-02 23:28:27 user1106464

執行http請求的空例外Android

回答

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