在2.2（Level8）和2.3.3（level10）中工作的Android項目在4.2.2（level16）中不起作用？

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在我的項目的JSONObject和JSONArray數據工作在8級和10級，但同樣的代碼無法正常工作16爲什麼發生在這裏的水平是我的代碼在2.2（Level8）和2.3.3（level10）中工作的Android項目在4.2.2（level16）中不起作用？

HttpClient httpclient = new DefaultHttpClient(); 

    HttpGet httpget = new HttpGet(url); 
    HttpResponse response; 
    try { 
     response = httpclient.execute(httpget); 
     Log.i("response", "response" + response); 
     HttpEntity entity = response.getEntity(); 
     Log.i("entity", "entity" + entity); 

     if (entity != null) { 

      InputStream instream = entity.getContent(); 
      String result = convertStreamToString(instream); 
      JSONObject json = new JSONObject(result); 

      JSONObject jsonOnb = json.getJSONObject("query").getJSONObject("pages") ; 
      JSONObject pagesObj = jsonOnb.getJSONObject(jsonOnb.names().getString(0));   

      Log.i("pageid", "pageid= " +pagesObj.get("pageid"));     
      Log.i("title", "title= " +pagesObj.get("title")); 
      instream.close(); 
     } 
    } catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
}

這個代碼在8級和10個工作，但沒有工作16級在16級

02-18 16:00:22.480: D/AndroidRuntime(605): Shutting down VM 
02-18 16:00:22.480: W/dalvikvm(605): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
02-18 16:00:22.500: E/AndroidRuntime(605): FATAL EXCEPTION: main 
02-18 16:00:22.500: E/AndroidRuntime(605): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.a/com.example.a.MainActivity}: android.os.NetworkOnMainThreadException 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.os.Looper.loop(Looper.java:137) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.ActivityThread.main(ActivityThread.java:4745) 
02-18 16:00:22.500: E/AndroidRuntime(605): at java.lang.reflect.Method.invokeNative(Native Method) 
02-18 16:00:22.500: E/AndroidRuntime(605): at java.lang.reflect.Method.invoke(Method.java:511) 
02-18 16:00:22.500: E/AndroidRuntime(605): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
02-18 16:00:22.500: E/AndroidRuntime(605): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
02-18 16:00:22.500: E/AndroidRuntime(605): at dalvik.system.NativeStart.main(Native Method) 
02-18 16:00:22.500: E/AndroidRuntime(605): Caused by: android.os.NetworkOnMainThreadException 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
02-18 16:00:22.500: E/AndroidRuntime(605): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
02-18 16:00:22.500: E/AndroidRuntime(605): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
02-18 16:00:22.500: E/AndroidRuntime(605): at java.net.InetAddress.getAllByName(InetAddress.java:214) 
02-18 16:00:22.500: E/AndroidRuntime(605): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
02-18 16:00:22.500: E/AndroidRuntime(605): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
02-18 16:00:22.500: E/AndroidRuntime(605): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
02-18 16:00:22.500: E/AndroidRuntime(605): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
02-18 16:00:22.500: E/AndroidRuntime(605): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
02-18 16:00:22.500: E/AndroidRuntime(605): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
02-18 16:00:22.500: E/AndroidRuntime(605): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
02-18 16:00:22.500: E/AndroidRuntime(605): at com.example.a.MainActivity.onCreate(MainActivity.java:41) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.Activity.performCreate(Activity.java:5008) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
02-18 16:00:22.500: E/AndroidRuntime(605): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
02-18 16:00:22.500: E/AndroidRuntime(605): ... 11 more

line 41 is響應= httpclient.execute（HTTPGET）面臨着這樣的錯誤;`

來源

2013-02-18 NagarjunaReddy

你在主線程中調用網絡操作？ – Renjith 2013-02-18 10:56:08

網絡操作意味着INTERNET權限.... – NagarjunaReddy 2013-02-18 10:58:06

共振爲負面標記...... – NagarjunaReddy 2013-02-18 10:58:55

您需要添加這兩個行代碼在你onCreate()功能

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 

StrictMode.setThreadPolicy(policy);

來源

2013-02-18 10:47:50 Bucks

爲什麼這個答案的負面標記.. ... – NagarjunaReddy 2013-02-18 11:13:41

那是因爲您在主線程本身中調用網絡操作（如webService）。

根據官方文檔：NetworkOnMainThreadException

當應用程序試圖在其主線程執行網絡操作時引發的異常。

這僅適用於針對Honeycomb SDK或的應用程序。針對早期SDK版本的應用程序允許在其主要事件循環線程上執行聯網，但不鼓勵。

它能夠更好地使用AsyncTask

來源

2013-02-18 10:59:40 Renjith

在2.2（Level8）和2.3.3（level10）中工作的Android項目在4.2.2（level16）中不起作用？

回答

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