Question

我对一个小型测试项目有疑问。

- ＆GT;问一个restfull webservice

   public String callRestWebService(){  
       String result="";
       System.out.println(".....REST..........");
          HttpClient httpclient = new DefaultHttpClient();  
          HttpGet request = new HttpGet(wsURL);  
          ResponseHandler<String> handler = new BasicResponseHandler();  
          try {  
              result = httpclient.execute(request, handler); 
              System.out.println("..result..."+result);
          } catch (ClientProtocolException e) {  
              e.printStackTrace();  
          } catch (IOException e) {  
              e.printStackTrace();  
          }  
          httpclient.getConnectionManager().shutdown();  
          return(result);
      } // end callWebService()

此代码没有问题。在AndroidManifest.xml中添加SdkVersion后

使用-SDK 机器人：的minSdkVersion =＆＃34; 16＆＃34; 机器人：targetSdkVersion =＆＃34; 23＆＃34;

该应用在行中有例外

result = httpclient.execute(request, handler); 



Caused by: 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:653)

at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
at info.rori.androidlunchbox.MainActivity.callRestWebService(MainActivity.java:57)

at info.rori.androidlunchbox.MainActivity.onCreate(MainActivity.java:27)

at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)

... 11 more

问题出在哪里？

此致麦克劳德

Answer 1

检查此stackoverflow帖子。它有解决您问题的确切方法

Error StrictMode$AndroidBlockGuardPolicy.onNetwork

在Manifest中添加min / targetSdkVersion后的Android Exception

1 个答案: