Question

我是android编程的新手（第一个项目），我需要帮助才能让我的代码工作...... 好的，所以我有一个方法可以调用webservice并从那里获取字符串。它正在开发avd（在2.2上）

以下是代码：

public void NewCall(int Position)
{
    String SOAP_ACTION = "http://tempuri.org/";
    String NAMESPACE = "http://tempuri.org/";
    String METHOD_NAME = "";
    String URL = "http://test.com/Service1.asmx?WSDL";

    if(Position == 0)
    {
        SOAP_ACTION += "Method1";
        METHOD_NAME = "Method1";
    }
    else if(Position == 1)
    {
        SOAP_ACTION += "Method2";
        METHOD_NAME = "Method2";
    }
    else if(Position == 2)
    {
        SOAP_ACTION += "Method3";
        METHOD_NAME = "Method3";
    }
    else if(Position == 3)
    {
        SOAP_ACTION += "Method4";
        METHOD_NAME = "Method4";
    }

    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

    envelope.setOutputSoapObject(request);
    envelope.dotNet = true;

    try 
    {
        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapObject result = (SoapObject)envelope.bodyIn;

        if(result != null)
        {
            String textRez = result.getProperty(0).toString();

            addRow(textRez); //method for inserting new row in the database

        }
    } 
    catch (Exception e) 
    {
        e.printStackTrace();
    }
}

但是正如我读到的那样，你不能在android 3.0+的'主线程'中做到这一点，作为一个解决方案，我看到你可以用AsyncClass做到这一点。关于这一点，我试图结合我发现的例子和我的代码，但它还没有给我结果...... 我认为我需要将Position作为整数解析为AssyncClass，执行doInBackground中所需的代码，然后我需要将结果作为String。我试着写出类似这样的东西，但它没有给我带来任何成功......

所以，如果你们中的某些人可以帮助/指导我解决这个问题，我将非常感激。

谢谢。

编辑：这是我尝试使用AsyncClass的方法：

private class wsGet extends AsyncTask<String, Void, String>
{

    @Override
    protected String doInBackground(String... params) {
    int Position = Integer.parseInt(params[0]); 
    String SOAP_ACTION = "http://tempuri.org/";
    String NAMESPACE = "http://tempuri.org/";
    String METHOD_NAME = "";
    String URL = "http://test.com/Service1.asmx?WSDL";


    if(Position == 0)
    {
        SOAP_ACTION += "Method1";
        METHOD_NAME = "Method1";
    }
    else if(Position == 1)
    {
        SOAP_ACTION += "Method2";
        METHOD_NAME = "Method2";
    }
    else if(Position == 2)
    {
        SOAP_ACTION += "Method3";
        METHOD_NAME = "Method3";
    }
    else if(Position == 3)
    {
        SOAP_ACTION += "Method4";
        METHOD_NAME = "Method4";
    }

        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

        envelope.setOutputSoapObject(request);
        envelope.dotNet = true;

        try 
        {
            HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
            androidHttpTransport.call(SOAP_ACTION, envelope);
            SoapObject result = (SoapObject)envelope.bodyIn;

            if(result != null)
            {
                tekstRez = result.getProperty(0).toString();

            }
        } 
        catch (Exception e) 
        {
            e.printStackTrace();
        }

        return tekstRez;
    }

然后为了调用这个我尝试了：

public void NewTenders(int Pos)
{
    String Position = String.valueOf(Pos);

    String[] params= {Position}; //to pass to doInBackground

    //Pass your args array and the current activity to the AsyncTask    

    String tekst = "";
    try {
        tekst = new wsGet().execute(params).get();
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ExecutionException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }addRow(tekst);

虽然，它对我不起作用......

Answer 1

从android 3.0+开始，您无法从主线程调用Web服务。将此整个代码写入DoInBackground的{{1}}。

AsyncClass无法将值返回给调用类。 AsyncClass此处将值传递给return。使用AsyncClass中的folloing函数

onPostExecute

Answer 2

或者您可以将此行添加到您正在调用webservice

的活动中

    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }

就在setContentView（）之后，那应该是诀窍

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