Android应用强制关闭调用ksoap web服务

Question

我正在使用 .net Web 服务通过 ksoap 发送一个 json 字符串。我正在使用异步任务来运行 Web 服务，它在 3g、2g 和 wifi 上成功运行，但在运行时出现互联网连接问题，应用程序被强制关闭。 我的异步任务是-

public class AsyncCallSoapData extends AsyncTask<String, Void, String> {
    private ProgressDialog dialog = new ProgressDialog(GPSActivity.this);

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        dialog = new ProgressDialog(GPSActivity.this);
        dialog.setMessage("Data sending...");
        dialog.setIndeterminate(false);
        dialog.setCancelable(false);
        dialog.show();
    }

    @Override
    protected String doInBackground(String... params) {
        // TODO Auto-generated method stub
        GPSWebserviceCall cs = new GPSWebserviceCall();
        String response = cs.GetData();
        return response;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        dialog.dismiss();
        res = Integer.parseInt(result);

        if (res > 0) {
            Toast.makeText(GPSActivity.this, "Data successfully send", Toast.LENGTH_LONG).show();
        }
    }
}

网络服务类

package com.mycode.webservice;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import com.quantta.gps.GPSActivity;

public class GPSWebserviceCall {

public String GetData() {
    String SOAP_ACTION = "http://tempuri.org/IService/dayRecord";
    String OPERATION_NAME = "dayRecord";
    String WSDL_TARGET_NAMESPACE = "http://tempuri.org/";
    String SOAP_ADDRESS = "http://swift.quantta.com/Service.svc";
    SoapObject request = new SoapObject(WSDL_TARGET_NAMESPACE,       OPERATION_NAME);

    PropertyInfo PI = new PropertyInfo();
    PI.setName("id");
    PI.setValue(GPSActivity.header_name);
    PI.setType(String.class);
    request.addProperty(PI);

    PI = new PropertyInfo();
    PI.setName("JSONformat");
    PI.setValue(GPSActivity.myJson);
    PI.setType(String.class);
    request.addProperty(PI);

    SoapSerializationEnvelope envelop = new SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelop.dotNet = true;
    envelop.setOutputSoapObject(request);
    String strResponse = null;

    try {
        HttpTransportSE httpTransport = new HttpTransportSE(SOAP_ADDRESS);
        httpTransport.setXmlVersionTag("<?xml version='1.0' encoding='utf-8'?>");
        httpTransport.debug = true;
        httpTransport.call(SOAP_ACTION, envelop);
        strResponse = httpTransport.responseDump;

        String response = "";
        SoapPrimitive result = (SoapPrimitive) envelop.getResponse();
        if (result != null)
            response = result.toString();
        return response;
    } catch (Exception e) {
        strResponse = "Error :"+e ;
    }
    return strResponse;
}
}

如何在运行时实现，由于互联网连接，服务器没有响应，asynctask 应该停止，但应用程序不应该强制关闭。如果你能用我的代码给我实现，请帮助我。

Answer 1

如果您的请求失败，则返回 null。因为如果发生任何网络中断，您已经妥善处理。

if (result != null)
{
  response = result.toString();
 }else{
      return null;
 }

或将response 初始化为null。从上面的代码中，您的初始化被观察为空字符串。

在OnPostexecute() 中接收 null 时进行 null 检查。

  @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
       if(result!=null){
      }else{
      // Your message to user saying that user's internetconnection is lost.
        }
    }

Answer 2

您必须检查网络服务调用的互联网连接并管理您可以使用 try-catch 块管理的所有异常情况。

Answer 3

在这种情况下，我正在使用模块“线程”来创建新的“线程”来发送 web 服务

public int onStartCommand(Intent intent, int flags, int startId){
    Thread t = new Thread(){
        public void run(){
            try {
                boolean testConnection = SendData();
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        }
    };
    t.start();
    return flags;
}

调用函数

    public void SendData() {
        String TAG = "test connection";
        String NAMESPACE = "http://tempuri.org/mywebservice/Service1";
        String SOAP_ACTION = "http://tempuri.org/mywebservice/Service1/HelloWorld";
        String METHOD_NAME = "HelloWorld";
        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

        envelope.dotNet = true;
        envelope.setOutputSoapObject(request);
        HttpTransportSE httpTransport = new HttpTransportSE(path, 30000);
        Object response = null;
        //Enable Strict mode for policy android
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        try {
            httpTransport.call(SOAP_ACTION, envelope);
            Log.v(TAG, "out :" + envelope.bodyOut.toString());
            Log.v(TAG, "in :" + envelope.bodyIn.toString());
            httpTransport.getServiceConnection().disconnect();

            //return something
            return true;
        } catch (Exception exception) {
            exception.printStackTrace();

            //return something
            return false;
        }
    }

如果你使用这样的代码，你的应用不会被 android 强制关闭。

抱歉，代码中的某些东西不好，因为我是 android dev 的新手。