Android和Restful服務返回json文件？

我只是想處理來自我網站的安寧服務的響應，但每當我執行「httpResponse = httpclient.execute（httpget）;」發生異常，我看不出它有什麼問題，因爲它是寧靜的服務，是否有人知道下面的代碼有什麼問題？提前謝謝了。Android和Restful服務返回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(); 
    } 
}

這裏是logcat中發現的堆棧跟蹤，謝謝：

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)

來源

2011-11-08 ittechie

你有沒有在AndroidManifest.xml上網權限？ – Selvin

提供堆棧跟蹤。 –

我們從這裏看不到例外。 –

此代碼（用於發送HTTP 後請求）就是我用了幾次，它可能幫助你...

  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);

來源

2011-11-08 17:14:35

這不會幫助，異常意味着任何類型的網絡操作不能發生在主線程上。 –

異常的名稱告訴你你需要的一切：NetworkOnMainThreadException

你不應該在UI線程中做網絡的東西，並且活動在那裏運行。嘗試使用線程或更好的AsyncTask來進行網絡呼叫。

不要忘了你正在可能沒有網絡連接或非常慢的設備上創建應用程序。這可能會導致需要超過5秒（非常常見）的呼叫，並導致ANR（應用程序無響應）消息和無響應的應用程序。有關android page for responsiveness programming的更多信息。

來源

2011-11-08 17:43:32 WarrenFaith

如果您的目標是Honeycomb SDK或更高版本，則主線程上不允許執行網絡操作。見here -

「當應用程序試圖在其主線程中執行聯網操作時引發的異常這只是拋出應用針對蜂窩SDK或更高」

使用AsyncTask類在後臺運行長時間運行或網絡任務。

邁克

來源

2011-11-08 17:45:21

編寫應用程序標記上方互聯網的權限，請參閱下面的代碼<uses-permission android:name="android.permission.INTERNET" />

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

來源

2013-02-07 14:17:28 mukil

Android和Restful服務返回json文件？

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