java - android ksoap2 崩溃，我无法捕捉到它

Question

我正在关注这个tutorial 。它非常简单，我喜欢它，但它在模拟器上崩溃。我无法捕捉到错误。我不明白这个问题。这是一段代码。

private final String NAMESPACE = "http://www.webserviceX.NET/";
private final String URL = "http://www.webservicex.net/ConvertWeight.asmx";
private final String SOAP_ACTION = "http://www.webserviceX.NET/ConvertWeight";
private final String METHOD_NAME = "ConvertWeight";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 

    String weight = "3700";
    String fromUnit = "Grams";
    String toUnit = "Kilograms";


    PropertyInfo weightProp =new PropertyInfo();
    weightProp.setName("Weight");
    weightProp.setValue(weight);
    weightProp.setType(double.class);
    request.addProperty(weightProp);

    PropertyInfo fromProp =new PropertyInfo();
    fromProp.setName("FromUnit");
    fromProp.setValue(fromUnit);
    fromProp.setType(String.class);
    request.addProperty(fromProp);

    PropertyInfo toProp =new PropertyInfo();
    toProp.setName("ToUnit");
    toProp.setValue(toUnit);
    toProp.setType(String.class);
    request.addProperty(toProp);

    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(request);
    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

    try {
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
        Log.i("myApp", response.toString());

        TextView tv = new TextView(this);
        tv.setText(weight+" "+fromUnit+" equal "+response.toString()+ " "+toUnit);
        setContentView(tv);

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

}

你认为问题出在哪里？我下载了 ksoap2 库并包含在项目中。我也在我的真实设备上尝试过并且有效。我还在配置文件上启用了互联网访问。

任何帮助都会很棒。或者你能推荐另一个教程吗？

Answer 1

Android 3.0之后无法在activity的主线程中访问web，需要启动新的线程来访问web