android.os.NetworkOnMainThreadException-白红宇

android.os.NetworkOnMainThreadException

阅读量：7048 次

发布时间：2019-06-28

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运行环境：

Android Version：4.4.2

11-04 02:27:43.679    1333-1333/com.jast.menu_drawer E/AndroidRuntime﹕ FATAL EXCEPTION: main    Process: com.jast.menu_drawer, PID: 1333    android.os.NetworkOnMainThreadException            at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)            at java.net.InetAddress.lookupHostByName(InetAddress.java:385)            at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)            at java.net.InetAddress.getAllByName(InetAddress.java:214)            at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)            at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)            at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)            at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)            at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)            at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)            at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)            at com.jast.menuDrawer.utils.HttpUtils.sendPostMessage(HttpUtils.java:24)            at com.jast.menuDrawer.fragment.ArticleFragment.getData(ArticleFragment.java:53)            at com.jast.menuDrawer.fragment.ArticleFragment.onCreateView(ArticleFragment.java:40)            at android.app.Fragment.performCreateView(Fragment.java:1700)            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)            at android.app.BackStackRecord.run(BackStackRecord.java:684)            at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)            at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)            at android.os.Handler.handleCallback(Handler.java:733)            at android.os.Handler.dispatchMessage(Handler.java:95)            at android.os.Looper.loop(Looper.java:136)            at android.app.ActivityThread.main(ActivityThread.java:5017)            at java.lang.reflect.Method.invokeNative(Native Method)            at java.lang.reflect.Method.invoke(Method.java:515)            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)            at dalvik.system.NativeStart.main(Native Method)

问题分析：

官网API

Class Overview

The exception that is thrown when an application attempts to perform a networking operation on its main thread.

This is only thrown for applications targeting the Honeycomb SDK or higher. Applications targeting earlier SDK versions are allowed to do networking on their main event loop threads, but it's heavily discouraged. See the document.

Also see .

总结：

在主线程中访问网络。

解决方案：

不要再主线程中访问网络。

通过实验，使用:这个还是比较好的（不知道用什么词来形容此刻心情），代码如下：

public class myAsyncTask extends AsyncTask
    
     
      
       >>{        @Override        protected void onPreExecute() {            super.onPreExecute();        }        @Override        protected List
       
        
         > doInBackground(String... params) {            JSONObject jobj = JSON.parseObject(HttpUtils.sendPostMessage(params[0], "UTF-8"));            JSONArray arr = jobj.getJSONArray("LatestArticles");            List
         
           articles = JSON.parseArray(arr.toString(),Article.class); ArrayList
          
           
            > list = new ArrayList
            
             
              >(); HashMap
              
                map = null; for(Article article:articles){ map = new HashMap
               
                (); map.put("article_title",article.getTitle()); map.put("article_PubDate",article.getPubDate()); map.put("article_category",article.getCategory()); map.put("article_articleNo",article.getArticleNo()); list.add(map); } return list; } @Override protected void onPostExecute(List
                
                 
                  > result) { adapter = new SimpleAdapter( rootView.getContext(), result, R.layout.article_list_item, new String[]{"article_title", "article_PubDate", "article_category", "article_articleNo"}, new int[]{R.id.article_title, R.id.article_PubDate, R.id.article_category, R.id.article_articleNo}); articleItem.setAdapter(adapter); } }