如何在異步任務中進行 ksoap2 調用？

Question

我是android開發的新手。 我正在嘗試開發一個將與 .net webservice 連接以檢索數據的應用程序。 我想使用AsyncTask進行ksoap2調用。 我怎么把它asyncronus用的AsyncTask？

我的 SoapCall 課程是

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;
    }
}

到目前為止，我通過在主要活動中調用連接方法來獲得響應

SoapCall  call1= new SoapCall();

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

Answer 1

使用AsyncTask很簡單。 這是一個例子。

 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;
  }
}

以及對帶參數的任務的調用。

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

希望它會有所幫助。

Answer 2

我建議您使用 AsyncTaskLoader，根據我的口味，它比 AsyncTask 更容易。 看看這里，這個例子非常廣泛，一開始看起來很嚇人，你可能會發現更簡單的例子。 這個想法是你的 Activity 實現LoaderCallbacks來創建加載器和一個在加載器完成時被調用的方法。 您通過LoaderManager '啟動'一個加載器。 AsynctaskLoader 是一個extends AsyncTaskLoader並執行異步操作的類。

我給你舉個簡單的例子：

這是 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();



}

}

這是您在 Activity 中將啟動加載器的內容，它是一個內部類：

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) {

    }
}

這就是你從任何你想要的地方（在那個活動中）啟動加載器的方式：

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

其中 0 是您提供給加載程序的 ID，null 是一組參數。 祝你好運 ：）