Java Android中的HTTP POST，强制关闭？

当我按下某个按钮时，我试图通过Android发送一个简单的HTTP请求。但每次我这么做，我的应用程序force就会关闭。为什么？顺便说一句，我对Android开发还不熟悉

我的代码：

 HttpClient httpclient = new DefaultHttpClient();
 HttpPost httppost = new HttpPost("http://www.office.school-blog.de/api/check-login.php");

try {
    // Add your data
    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
    nameValuePairs.add(new BasicNameValuePair("User", "Steffen"));
    nameValuePairs.add(new BasicNameValuePair("Password", "test1234"));
    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

    // Execute HTTP Post Request
    HttpResponse response = httpclient.execute(httppost);

} catch (ClientProtocolException e) {
    // TODO Auto-generated catch block
} catch (IOException e) {
    // TODO Auto-generated catch block
}

03-16 14:36:47.554: D/AndroidRuntime(449): Shutting down VM
03-16 14:36:47.554: W/dalvikvm(449): threadid=1: thread exiting with uncaught exception (group=0x40014760)
03-16 14:36:47.574: E/AndroidRuntime(449): FATAL EXCEPTION: main
03-16 14:36:47.574: E/AndroidRuntime(449): android.os.NetworkOnMainThreadException
03-16 14:36:47.574: E/AndroidRuntime(449):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
03-16 14:36:47.574: E/AndroidRuntime(449):  at java.net.InetAddress.lookupHostByName(InetAddress.java:477)
03-16 14:36:47.574: E/AndroidRuntime(449):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:277)
03-16 14:36:47.574: E/AndroidRuntime(449):  at java.net.InetAddress.getAllByName(InetAddress.java:249)
03-16 14:36:47.574: E/AndroidRuntime(449):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:136)
03-16 14:36:47.574: E/AndroidRuntime(449):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
03-16 14:36:47.574: E/AndroidRuntime(449):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
03-16 14:36:47.574: E/AndroidRuntime(449):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
03-16 14:36:47.574: E/AndroidRuntime(449):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
03-16 14:36:47.574: E/AndroidRuntime(449):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
03-16 14:36:47.574: E/AndroidRuntime(449):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
03-16 14:36:47.574: E/AndroidRuntime(449):  at com.shr.khg.DashboardActivity$1.onClick(DashboardActivity.java:89)
03-16 14:36:47.574: E/AndroidRuntime(449):  at android.view.View.performClick(View.java:3110)
03-16 14:36:47.574: E/AndroidRuntime(449):  at android.view.View$PerformClick.run(View.java:11934)
03-16 14:36:47.574: E/AndroidRuntime(449):  at android.os.Handler.handleCallback(Handler.java:587)
03-16 14:36:47.574: E/AndroidRuntime(449):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-16 14:36:47.574: E/AndroidRuntime(449):  at android.os.Looper.loop(Looper.java:132)
03-16 14:36:47.574: E/AndroidRuntime(449):  at android.app.ActivityThread.main(ActivityThread.java:4123)
03-16 14:36:47.574: E/AndroidRuntime(449):  at java.lang.reflect.Method.invokeNative(Native Method)
03-16 14:36:47.574: E/AndroidRuntime(449):  at java.lang.reflect.Method.invoke(Method.java:491)
03-16 14:36:47.574: E/AndroidRuntime(449):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
03-16 14:36:47.574: E/AndroidRuntime(449):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
03-16 14:36:47.574: E/AndroidRuntime(449):  at dalvik.system.NativeStart.main(Native Method)
03-16 14:36:50.064: I/Process(449): Sending signal. PID: 449 SIG: 9

有人知道出了什么问题吗？

使用AsyncTask

不要在主线程上进行网络操作：对于android版本>=3.0，不允许这样做。

在

doInBackground

方法中执行网络操作

---

阅读。

Android不允许阻止UI（或主）线程上的网络访问等任务。这是与用户交互有关的所有事情都要运行的线程。因此，您需要创建（可能）和AsynTask类来运行查询并反馈信息。看见这里还提供了一个异步任务的示例：

您试图在UI线程上执行网络操作，尝试使用一个单独的线程或异步任务这将解决您的问题：

class MyHttpPost extends AsyncTask<String, Void, Boolean> {
@Override
protected Boolean doInBackground(String... params) 
{

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.office.school-blog.de/api/check-login.php");

        try {
         // Add your data
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
        nameValuePairs.add(new BasicNameValuePair("User", "Steffen"));
        nameValuePairs.add(new BasicNameValuePair("Password", "test1234"));
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        // Execute HTTP Post Request
        HttpResponse response = httpclient.execute(httppost);
    HttpEntity httpEntity = response.getEntity();
                String result = httpEntity.getContent();


        } catch (ClientProtocolException e) {
         // TODO Auto-generated catch block
        } catch (IOException e) {
         // TODO Auto-generated catch block
        }



return true;
                    }

}

首先，在任何情况下，如果发生错误，您都应该读取错误堆栈跟踪
android.os.NetworkOnMainThreadException
-主线程上的netwrok异常。。。如果你不明白异常类型是什么，就用谷歌搜索它。第一个链接指向developer.android.com。第一句话是：
当应用程序试图在其主线程上执行网络操作时引发的异常。
。所以很容易理解自己的错误。
new MyHttpPost().execute();