Android 应用程序与 Web 服务的连接答案

【问题标题】：Android application connection with web servicesAndroid 应用程序与 Web 服务的连接
【发布时间】：2016-05-03 19:18:06
【问题描述】：

您好，我正在尝试通过以下链接连接网络服务的 android 应用程序

http://jatin4rise.wordpress.com/2010/10/03/part-2-calling-a-webservice-from-android-application/#comment-125

我能够在 Web 服务中创建 xsdl 文件这是android中的代码

package com.example.androidwsdlfrontend;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidWSDLFrontEnd extends Activity {
    private String METHOD_NAME = "sum"; // our webservice method name
    private String NAMESPACE = "http://calculator.backend.web.org";//&#8221"; // Here package name in webservice with reverse order.;

    private String SOAP_ACTION = NAMESPACE + METHOD_NAME; // NAMESPACE + method name

    private static final String URL = "http://10.0.2.2:8080/AndroidBackend/services/Calculate?wsdl";//&#8221"; // you

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

        TextView tv = (TextView) findViewById(R.id.txtAddition);
        try {
            SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
            request.addProperty("i", 5);
            request.addProperty("j", 15);
            SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
            envelope.dotNet = true;
            envelope.setOutputSoapObject(request);
            HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
            androidHttpTransport.call(SOAP_ACTION, envelope);
            Object result = envelope.getResponse();
            System.out.println("Result: " + result.toString());
            ((TextView) findViewById(R.id.txtAddition)).setText("Addition: "+ result.toString());
        } catch (Exception E) {
            E.printStackTrace();
            ((TextView) findViewById(R.id.txtAddition)).setText("Error: "+ E.getClass().getName() + ":" + E.getMessage());
        }
    }
}

在上面的代码中，当我编译时出现错误

SoapObject 请求 = new SoapObject(NAMESPACE, METHOD_NAME);

但我不知道如何解决它。请帮我。我已经在那个特定位置提到了我的 ipaddress。

【问题讨论】：

堆栈跟踪伙伴？发布 logCat！
12-27 08:08:30.663: E/AndroidRuntime(4344): 致命异常: main 12-27 08:08:30.663: E/AndroidRuntime(4344): java.lang.NoClassDefFoundError: org.ksoap2.serialization.SoapObject 12-27 08:08:30.663: E/AndroidRuntime(4344): at com.example.androidwsdlfrontend.AndroidWSDLFrontEnd.onCreate(AndroidWSDLFrontEnd.java:27)
我认为图书馆有问题，kSoap。你导入了吗？这可能会派上用场：stackoverflow.com/questions/10020740/…
是的，我再次下载并导入了它。如果我们不导入它，它会在整个文件中显示错误，对吧？

标签： android web-services

【解决方案1】：

以下视频教程可能会有所帮助： https://www.youtube.com/watch?v=v9EowBVgwSo https://www.youtube.com/watch?v=t8__EuSS69E
不要忘记在清单中添加访问互联网的权限
检查参数大小写是否与
中的相同网络服务
检查是否已将库路径添加到buil.gradle

【讨论】：