How can I make a ksoap2 call in async task?

问题:

I am a newbie on android development. I am trying to develop an application which will connect with .net webservice in order to retrieve data. I would like to make the ksoap2 call with async task. How I call it asyncronus with asynctask?

My SoapCall class is

public class SoapCall {

public final static String SOAP_ACTION = "http://www.alpha.net.com/ExecuteEBSCommand";

public final static String OPERATION_NAME = "ExecuteEBSCommand";

public final static String NAMESPACE = "http://www.alpha.net.com";

public final static String URL = "http://192.168.2.100/Ebs2Alpha/Service.asmx";





public String connection(String Command, String CommandParameters) throws Throwable, Throwable {
    String response = null;
    SoapObject Request = new SoapObject(NAMESPACE, OPERATION_NAME);
    Request.addProperty("strCommand", Command);
    Request.addProperty("strCommandParameters", CommandParameters);



    SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(
            SoapEnvelope.VER11);
    soapEnvelope.dotNet = true;
    soapEnvelope.setOutputSoapObject(Request);
    // Needed to make the internet call

    // Allow for debugging - needed to output the request

        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        androidHttpTransport.debug = true;
        // this is the actual part that will call the webservice
        androidHttpTransport.call(SOAP_ACTION, soapEnvelope);

        // Get the SoapResult from the envelope body.
        SoapObject result = (SoapObject) soapEnvelope.bodyIn;

        response = result.getProperty(0).toString();


    return response;
    }

}

So far I am getting the response by calling the connection method in main activity with

SoapCall  call1= new SoapCall();

call1.connection("get_clients", "%");

回答1:

Using asynctask is straightforward. Here is an example.

 public class MyTask extends AsyncTask<String, Integer, String>{


    @Override
    protected String doInBackground(String... params) {
    String response = null;
    SoapObject Request = new SoapObject(NAMESPACE, OPERATION_NAME);
    Request.addProperty("strCommand", params[0]);
    Request.addProperty("strCommandParameters", params[1]);



    SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(
        SoapEnvelope.VER11);
    soapEnvelope.dotNet = true;
    soapEnvelope.setOutputSoapObject(Request);
    // Needed to make the internet call

    // Allow for debugging - needed to output the request

    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
    androidHttpTransport.debug = true;
    // this is the actual part that will call the webservice
    androidHttpTransport.call(SOAP_ACTION, soapEnvelope);

    // Get the SoapResult from the envelope body.
    SoapObject result = (SoapObject) soapEnvelope.bodyIn;

    response = result.getProperty(0).toString();


    return response;
}

}

And the call to the task with parameters.

MyTask myTask = new MyTask();
myTask.execute(new String[] {Command, CommandParameters});

Hope it will help.

回答2:

I'd suggest you use the AsyncTaskLoader which for my taste is easier than the AsyncTask. Have a look here, the example is very extensive and looks intimidating at first, you'll probably find much simpler ones. The idea is that your Activity implements LoaderCallbacks for the creation of the loader and a method that is being called when the loader has finished. You 'start' a loader via the LoaderManager. The AsynctaskLoader is a class that extends AsyncTaskLoader and does the asynchronous stuff.

I'll give you a simple example:

This is the AsyncTaskLoader:

public class StartupLoader extends AsyncTaskLoader<Boolean> {

Context context;

public StartupLoader(Context context) {
    super(context);
    this.context = context;
    forceLoad();

}

@Override
public Boolean loadInBackground() {

    // DO STUFF!

    return true;
}

@Override
protected void onStopLoading() {

}

@Override
public void onCanceled(Boolean data) {
    super.onCanceled(data);

}

@Override
protected void onReset() {
    super.onReset();



}

}

This is what you have in the Activity that will start the loader, it is an inner class:

public class StartupCallback implements
        LoaderManager.LoaderCallbacks<Boolean> {
    @Override
    public void onLoadFinished(Loader<Boolean> loader, Boolean succ) {

        // Here you get your results back

    }

    @Override
    public Loader<Boolean> onCreateLoader(int id, Bundle args) {

        return new StartupLoader(getApplicationContext());
    }

    @Override
    public void onLoaderReset(Loader<Boolean> loader) {

    }
}

And this is how you start the loader from whereever you want (within that Activity):

StartupCallback startupCallback = new StartupCallback();
getSupportLoaderManager().initLoader(0, null, startupCallback);

where 0 is an ID that you give the loader, null is a Bundle of arguments. Good luck :)