Android http-request导致错误-从3天开始

Question

我已经坐了3天了，在网上到处寻找，但它不起作用…每次我试图在android上发出一个http-request :它就会出现错误: unfourtunately，...已经停止了。下面是我的代码：

package sd.s;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class SdsdActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Thread trd = new Thread(new Runnable(){ 
              public void run(){ 
                  // Creating HTTP client 
                    HttpClient httpClient = new DefaultHttpClient(); 
                    // Creating HTTP Post 
                    HttpPost httpPost = new HttpPost( 
                            "http://www.test.com"); 

                    // Building post parameters 
                    // key and value pair 
                    List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(2); 
                    nameValuePair.add(new BasicNameValuePair("test", "test")); 
                    nameValuePair.add(new BasicNameValuePair("message", 
                            "Hi, trying Android HTTP post!")); 

                    // Url Encoding the POST parameters 
                    try { 
                        httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair)); 
                    } catch (UnsupportedEncodingException e) { 
                        // writing error to Log 
                        e.printStackTrace(); 
                    } 

                    // Making HTTP Request 
                    try { 
                        HttpResponse response = httpClient.execute(httpPost); 

                        // writing response to log 
                        Log.d("Http Response:", response.toString()); 
                    } catch (ClientProtocolException e) { 
                        // writing exception to log 
                        e.printStackTrace(); 
                    } catch (IOException e) { 
                        // writing exception to log 
                        e.printStackTrace(); 

                    } 
              } });
            trd.run(); 


    }
}

下面是我在LogCat上的输出

02-24 17:53:39.003: D/dalvikvm(516): Not late-enabling CheckJNI (already on)
02-24 17:53:40.293: D/AndroidRuntime(516): Shutting down VM
02-24 17:53:40.304: W/dalvikvm(516): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
02-24 17:53:40.313: E/AndroidRuntime(516): FATAL EXCEPTION: main
02-24 17:53:40.313: E/AndroidRuntime(516): java.lang.RuntimeException: Unable to start activity ComponentInfo{sd.s/sd.s.SdsdActivity}: android.os.NetworkOnMainThreadException
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.os.Looper.loop(Looper.java:137)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.ActivityThread.main(ActivityThread.java:4424)
02-24 17:53:40.313: E/AndroidRuntime(516):  at java.lang.reflect.Method.invokeNative(Native Method)
02-24 17:53:40.313: E/AndroidRuntime(516):  at java.lang.reflect.Method.invoke(Method.java:511)
02-24 17:53:40.313: E/AndroidRuntime(516):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-24 17:53:40.313: E/AndroidRuntime(516):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-24 17:53:40.313: E/AndroidRuntime(516):  at dalvik.system.NativeStart.main(Native Method)
02-24 17:53:40.313: E/AndroidRuntime(516): Caused by: android.os.NetworkOnMainThreadException
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
02-24 17:53:40.313: E/AndroidRuntime(516):  at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
02-24 17:53:40.313: E/AndroidRuntime(516):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
02-24 17:53:40.313: E/AndroidRuntime(516):  at java.net.InetAddress.getAllByName(InetAddress.java:220)
02-24 17:53:40.313: E/AndroidRuntime(516):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
02-24 17:53:40.313: E/AndroidRuntime(516):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
02-24 17:53:40.313: E/AndroidRuntime(516):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
02-24 17:53:40.313: E/AndroidRuntime(516):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
02-24 17:53:40.313: E/AndroidRuntime(516):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
02-24 17:53:40.313: E/AndroidRuntime(516):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
02-24 17:53:40.313: E/AndroidRuntime(516):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
02-24 17:53:40.313: E/AndroidRuntime(516):  at sd.s.SdsdActivity.onCreate(SdsdActivity.java:52)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.Activity.performCreate(Activity.java:4465)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
02-24 17:53:40.313: E/AndroidRuntime(516):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
02-24 17:53:40.313: E/AndroidRuntime(516):  ... 11 more
02-24 17:59:31.783: D/AndroidRuntime(584): Shutting down VM
02-24 17:59:31.783: W/dalvikvm(584): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
02-24 17:59:31.793: E/AndroidRuntime(584): FATAL EXCEPTION: main
02-24 17:59:31.793: E/AndroidRuntime(584): java.lang.RuntimeException: Unable to start activity ComponentInfo{sd.s/sd.s.SdsdActivity}: android.os.NetworkOnMainThreadException
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.os.Looper.loop(Looper.java:137)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.ActivityThread.main(ActivityThread.java:4424)
02-24 17:59:31.793: E/AndroidRuntime(584):  at java.lang.reflect.Method.invokeNative(Native Method)
02-24 17:59:31.793: E/AndroidRuntime(584):  at java.lang.reflect.Method.invoke(Method.java:511)
02-24 17:59:31.793: E/AndroidRuntime(584):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-24 17:59:31.793: E/AndroidRuntime(584):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-24 17:59:31.793: E/AndroidRuntime(584):  at dalvik.system.NativeStart.main(Native Method)
02-24 17:59:31.793: E/AndroidRuntime(584): Caused by: android.os.NetworkOnMainThreadException
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
02-24 17:59:31.793: E/AndroidRuntime(584):  at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
02-24 17:59:31.793: E/AndroidRuntime(584):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
02-24 17:59:31.793: E/AndroidRuntime(584):  at java.net.InetAddress.getAllByName(InetAddress.java:220)
02-24 17:59:31.793: E/AndroidRuntime(584):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
02-24 17:59:31.793: E/AndroidRuntime(584):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
02-24 17:59:31.793: E/AndroidRuntime(584):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
02-24 17:59:31.793: E/AndroidRuntime(584):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
02-24 17:59:31.793: E/AndroidRuntime(584):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
02-24 17:59:31.793: E/AndroidRuntime(584):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
02-24 17:59:31.793: E/AndroidRuntime(584):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
02-24 17:59:31.793: E/AndroidRuntime(584):  at sd.s.SdsdActivity$1.run(SdsdActivity.java:53)
02-24 17:59:31.793: E/AndroidRuntime(584):  at java.lang.Thread.run(Thread.java:856)
02-24 17:59:31.793: E/AndroidRuntime(584):  at sd.s.SdsdActivity.onCreate(SdsdActivity.java:66)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.Activity.performCreate(Activity.java:4465)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
02-24 17:59:31.793: E/AndroidRuntime(584):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
02-24 17:59:31.793: E/AndroidRuntime(584):  ... 11 more
02-24 18:08:12.242: D/AndroidRuntime(626): Shutting down VM
02-24 18:08:12.242: W/dalvikvm(626): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
02-24 18:08:12.262: E/AndroidRuntime(626): FATAL EXCEPTION: main
02-24 18:08:12.262: E/AndroidRuntime(626): java.lang.RuntimeException: Unable to start activity ComponentInfo{sd.s/sd.s.SdsdActivity}: android.os.NetworkOnMainThreadException
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.os.Looper.loop(Looper.java:137)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.ActivityThread.main(ActivityThread.java:4424)
02-24 18:08:12.262: E/AndroidRuntime(626):  at java.lang.reflect.Method.invokeNative(Native Method)
02-24 18:08:12.262: E/AndroidRuntime(626):  at java.lang.reflect.Method.invoke(Method.java:511)
02-24 18:08:12.262: E/AndroidRuntime(626):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-24 18:08:12.262: E/AndroidRuntime(626):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-24 18:08:12.262: E/AndroidRuntime(626):  at dalvik.system.NativeStart.main(Native Method)
02-24 18:08:12.262: E/AndroidRuntime(626): Caused by: android.os.NetworkOnMainThreadException
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
02-24 18:08:12.262: E/AndroidRuntime(626):  at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
02-24 18:08:12.262: E/AndroidRuntime(626):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
02-24 18:08:12.262: E/AndroidRuntime(626):  at java.net.InetAddress.getAllByName(InetAddress.java:220)
02-24 18:08:12.262: E/AndroidRuntime(626):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
02-24 18:08:12.262: E/AndroidRuntime(626):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
02-24 18:08:12.262: E/AndroidRuntime(626):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
02-24 18:08:12.262: E/AndroidRuntime(626):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
02-24 18:08:12.262: E/AndroidRuntime(626):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
02-24 18:08:12.262: E/AndroidRuntime(626):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
02-24 18:08:12.262: E/AndroidRuntime(626):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
02-24 18:08:12.262: E/AndroidRuntime(626):  at sd.s.SdsdActivity$1.run(SdsdActivity.java:53)
02-24 18:08:12.262: E/AndroidRuntime(626):  at java.lang.Thread.run(Thread.java:856)
02-24 18:08:12.262: E/AndroidRuntime(626):  at sd.s.SdsdActivity.onCreate(SdsdActivity.java:66)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.Activity.performCreate(Activity.java:4465)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
02-24 18:08:12.262: E/AndroidRuntime(626):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
02-24 18:08:12.262: E/AndroidRuntime(626):  ... 11 more

也许我太愚蠢了，但是自从3天以来，我试图让它运行，应用程序开始了，但每次启动后都会停止…许可上网和防火墙是np > WebBrowser在模拟器中工作，有什么问题吗？非常感谢你的每一个回答！

Answer 1

您正在主线程上执行thread对象的run()方法。替换为：

trd.run();

有了这个：

trd.start();

Answer 2

从Android3.0开始，您不能在主线程上执行此类请求。

NetworkOnMainThreadException

类概述

当应用程序尝试在其主线程上执行网络操作时引发的异常。

只有针对Honeycomb SDK或更高版本的应用程序才会抛出此错误。针对早期SDK版本的应用程序被允许在其主事件循环线程上进行联网，但强烈建议您这样做。请参阅设计响应性文档。

另请参阅StrictMode。

有关构建响应式应用程序的指南，请参阅http://developer.android.com/guide/practices/design/responsiveness.html。

Answer 3

从您的日志中看，错误似乎是android.os.NetworkOnMainThreadException。从http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html上看，错误似乎是您试图在主线程中执行网络操作。由于这可能会使您的UI无响应，因此不鼓励这样做。由于你似乎是在严格模式(http://developer.android.com/reference/android/os/StrictMode.html)下运行，它会使应用程序崩溃。

此外，您应该调用trd.start()而不是trd.run()