Android和Restful服务返回json文件？

我只是想处理来自我网站的安宁服务的响应，但每当我执行“httpResponse = httpclient.execute（httpget）;”发生异常，我看不出它有什么问题，因为它是宁静的服务，是否有人知道下面的代码有什么问题？提前谢谢了。Android和Restful服务返回json文件？

package com.android.hummedia; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.URI; 
import java.net.URISyntaxException; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpHost; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.ResponseHandler; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.entity.StringEntity; 
import org.apache.http.impl.client.BasicResponseHandler; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.protocol.BasicHttpContext; 
import org.apache.http.protocol.HttpContext; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.R.string; 
import android.app.Activity; 
import android.content.Entity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 

public class searchResultList extends Activity{ 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.result); 
     int responseCode; 
     String message; 

     String query = "http://hummedia.byu.edu/mediainfo/search/?title=Harry"; 

     Button testButton = (Button) findViewById(R.id.test); 
     testButton.setOnClickListener(new View.OnClickListener() { 

      @Override 
    public void onClick(View view) { 
      Intent intent = new Intent(searchResultList.this, HummediaActivity.class); 
      startActivity(intent); 
      } 
     }); 

     HttpClient httpclient = new DefaultHttpClient(); 
     HttpGet httpget = new HttpGet(query); 
     HttpResponse httpResponse; 


     try { 
      httpResponse = httpclient .execute(httpget); 

     } catch (Exception e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     } 

    protected void onResume() { 
     super.onResume(); 
    } 
}

这里是logcat中发现的堆栈跟踪，谢谢：

11-08 10:30:02.944: W/System.err(646): android.os.NetworkOnMainThreadException 
11-08 10:30:02.964: W/System.err(646): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084) 
11-08 10:30:02.974: W/System.err(646): at java.net.InetAddress.lookupHostByName(InetAddress.java:391) 
11-08 10:30:02.984: W/System.err(646): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242) 
11-08 10:30:03.004: W/System.err(646): at java.net.InetAddress.getAllByName(InetAddress.java:220) 
11-08 10:30:03.014: W/System.err(646): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
11-08 10:30:03.024: W/System.err(646): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
11-08 10:30:03.045: W/System.err(646): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
11-08 10:30:03.054: W/System.err(646): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
11-08 10:30:03.064: W/System.err(646): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
11-08 10:30:03.074: W/System.err(646): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
11-08 10:30:03.084: W/System.err(646): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
11-08 10:30:03.104: W/System.err(646): at com.android.hummedia.searchResultList.onCreate(searchResultList.java:70) 
11-08 10:30:03.114: W/System.err(646): at android.app.Activity.performCreate(Activity.java:4465) 
11-08 10:30:03.174: W/System.err(646): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
11-08 10:30:03.184: W/System.err(646): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 
11-08 10:30:03.194: W/System.err(646): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 
11-08 10:30:03.215: W/System.err(646): at android.app.ActivityThread.access$600(ActivityThread.java:122) 
11-08 10:30:03.224: W/System.err(646): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 
11-08 10:30:03.234: W/System.err(646): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-08 10:30:03.244: W/System.err(646): at android.os.Looper.loop(Looper.java:137) 
11-08 10:30:03.254: W/System.err(646): at android.app.ActivityThread.main(ActivityThread.java:4340) 
11-08 10:30:03.264: W/System.err(646): at java.lang.reflect.Method.invokeNative(Native Method) 
11-08 10:30:03.274: W/System.err(646): at java.lang.reflect.Method.invoke(Method.java:511) 
11-08 10:30:03.284: W/System.err(646): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
11-08 10:30:03.294: W/System.err(646): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
11-08 10:30:03.306: W/System.err(646): at dalvik.system.NativeStart.main(Native Method)

来源

2011-11-08 ittechie

你有没有在AndroidManifest.xml上网权限？ – Selvin

提供堆栈跟踪。 –

我们从这里看不到例外。 –

此代码（用于发送HTTP 后请求）就是我用了几次，它可能帮助你...

  HttpClient httpclient = new DefaultHttpClient(); 

      HttpPost httppost = new HttpPost("http://mysite.com"); 
      ArrayList<NameValuePair> data = new ArrayList<NameValuePair>(2); 
      data.add(new BasicNameValuePair("name", "value")); 
      data.add(new BasicNameValuePair("name", "value")); 
      data.add(new BasicNameValuePair("key", "value")); 
      httppost.setEntity(new UrlEncodedFormEntity(data)); 
      HttpResponse response = httpclient.execute(httppost);

来源

2011-11-08 17:14:35

这不会帮助，异常意味着任何类型的网络操作不能发生在主线程上。 –

异常的名称告诉你你需要的一切：NetworkOnMainThreadException

你不应该在UI线程中做网络的东西，并且活动在那里运行。尝试使用线程或更好的AsyncTask来进行网络呼叫。

不要忘了你正在可能没有网络连接或非常慢的设备上创建应用程序。这可能会导致需要超过5秒（非常常见）的呼叫，并导致ANR（应用程序无响应）消息和无响应的应用程序。有关android page for responsiveness programming的更多信息。

来源

2011-11-08 17:43:32 WarrenFaith

如果您的目标是Honeycomb SDK或更高版本，则主线程上不允许执行网络操作。见here -

“当应用程序试图在其主线程中执行联网操作时引发的异常这只是抛出应用针对蜂窝SDK或更高”

使用AsyncTask类在后台运行长时间运行或网络任务。

迈克

来源

2011-11-08 17:45:21

编写应用程序标记上方互联网的权限，请参阅下面的代码<uses-permission android:name="android.permission.INTERNET" />

<application 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" >

来源

2013-02-07 14:17:28 mukil

Android和Restful服务返回json文件？

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