在Android中使用WCF服务时出错

我正在尝试使用WCF服务将数据POST到我的数据库，但似乎无法找出我的代码有什么问题，我尝试了不同的解决方案，但所有这些似乎都失败了。我是新的android开发，不知道如何调试。请帮帮我……
下面是我的代码:

WCF服务:

[ServiceContract]
public interface IAllocationService
{
    [OperationContract]
    [WebInvoke(
        Method = "POST",
        UriTemplate = "StrongestWifi",
        BodyStyle = WebMessageBodyStyle.WrappedRequest,
        ResponseFormat = WebMessageFormat.Json,
        RequestFormat = WebMessageFormat.Json)]
    void UpdateStrongestWifi(myWifiClass myWifiClass);
}
[DataContract]
public class myWifiClass
{
    [DataMember(Name = "Time")]
    public string Time
    {
        get;
        set;
    }
    [DataMember(Name = "SignalStrength")]
    public string SignalStrength
    {
        get;
        set;
    }
    [DataMember(Name = "SSID")]
    public string SSID
    {
        get;
        set;
    }

Android Code:

public void onGetWebService(View v)
{
    HttpPost request = new HttpPost(SERVICE_URI + "/StrongestWifi");
    request.setHeader("Accept", "application/json");            
    request.setHeader("Content-type", "application/json");
    JSONStringer getWifiInfo;
    try {
        getWifiInfo = new JSONStringer()
            .object()
                .key("myWifiClass")
                    .object()
                        .key("Time").value("TIME")                                  
                        .key("SignalStrength").value("Strength")
                        .key("SSID").value("ID")
                    .endObject()
                .endObject();
    StringEntity entity = new StringEntity(getWifiInfo.toString());
    request.setEntity(entity);
    // Send request to WCF service
    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpResponse response = httpClient.execute(request);
    Log.d("WebInvoke", "Saving : " + response.getStatusLine().getStatusCode());
    }
    catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

日志猫:

06-01 15:46:06.229: W/System.err(27711): android.os. networkonmainthreadexeption06-01 15:46:06.237: W/System.err(27711): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)06-01 15:46:06.237: W/System.err(27711): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)06-01 15:46:06.237: W/System.err(27711): at libcore.io. ibridge . connecterno (ibridge .java:127)06-01 15:46:06.237: W/System.err(27711): at libcore.io. ibridge .connect(ibridge .java:112)06-01 15:46:06.245: W/System.err(27711): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)06-01 15:46:06.245: W/System.err(27711): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)06-01 15:46:06.245: W/System.err(27711): at java.net.Socket.connect(Socket.java:842)06-01 15:46:06.245: W/System.err(27711): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)06-01 15:46:06.245: W/System.err(27711): at org.apache. http.imp.conn . defaultclientconnectionoperator . openconnection (DefaultClientConnectionOperator.java:144)06-01 15:46:06.253: W/System.err(27711): at org.apache. http.imp.conn . abstractpoolentry .open(AbstractPoolEntry.java:164)06-01 15:46:06.253: W/System.err(27711): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)06-01 15:46:06.253: W/System.err(27711): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)06-01 15:46:06.253: W/System.err(27711): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)06-01 15:46:06.253: W/System.err(27711): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)06-01 15:46:06.253: W/System.err(27711): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)06-01 15:46:06.253: W/System.err(27711): at com.example.pcsprojectnetworkcodes.MainActivity.onGetWebService(MainActivity.java:191)06-01 15:46:06.253: W/System.err(27711): at java.lang.reflect.Method。invokeNative(本地方法)06-01 15:46:06.261: W/System.err(27711): at java.lang.reflect.Method.invoke(Method.java:511)06-01 15:46:06.261: W/System.err(27711): at android.view.View$1.onClick(View.java:3594)06-01 15:46:06.261: W/System.err(27711): at android.view.View.performClick(View.java:4204)06-01 15:46:06.261: W/System.err(27711): at android.view.View$PerformClick.run(View.java:17360)06-01 15:46:06.261: W/System.err(27711): at android.os.Handler.handleCallback(Handler.java:725)06-01 15:46:06.261: W/System.err(27711): at android.os.Handler.dispatchMessage(Handler.java:92)06-01 15:46:06.269: W/System.err(27711): at android.os. loop .loop(loop .java:137)06-01 15:46:06.269: W/System.err(27711): at android.app.ActivityThread.main(ActivityThread.java:5237)06-01 15:46:06.276: W/System.err(27711): at java.lang.reflect.Method。invokeNative(本地方法)06-01 15:46:06.276: W/System.err(27711): at java.lang.reflect.Method.invoke(Method.java:511)06-01 15:46:06.276: W/System.err(27711): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)06-01 15:46:06.276: W/System.err(27711): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)06-01 15:46:06.284: W/System.err(27711): at dalvik.system. native . art。主要(本地方法)