Android return value from processFinish in AsyncTask

Question

in this below code i want to pass data from processFinish method to use that in outside class but i can not fix problem and i can not return value from processFinish in call function.

public class WSDLHelper  implements AsyncResponse{
    public SoapObject request;

    private String MainResult;

    public String call(SoapObject rq){

        new ProcessTask(rq, this).execute();
        return MainResult;
    }

    @Override
    public void processFinish(String output) {
        MainResult = output;
    }
}

class ProcessTask extends AsyncTask<Void, Void,  String> {
    public AsyncResponse delegate=null;

    SoapObject req1;

    public ProcessTask(SoapObject rq, AsyncResponse delegate) {
        req1 = rq;
        this.delegate = delegate;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(Void... params) {

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.setOutputSoapObject(this.req1);

        AndroidHttpTransport transport = new AndroidHttpTransport(Strings.URL_TSMS);
        transport.debug = true;

        String result = null;
        try {
            transport.call(Strings.URL_TSMS + this.req1.getName(), envelope);
            result = envelope.getResponse().toString();
        } catch (IOException ex) {
            Log.e("" , ex.getMessage());
        } catch (XmlPullParserException ex) {
            Log.e("" , ex.getMessage());
        }

        if (result.equals(String.valueOf(Integers.CODE_USER_PASS_FALSE))) {
            try {
                throw new TException(PublicErrorList.USERNAME_PASSWORD_ERROR);
            } catch (TException e) {
                e.printStackTrace();
            }
        }

        return result;
    }

    protected void onPostExecute(String result) {
        delegate.processFinish(result);
    }
}

please help me to develop call method to return output value to outside class. thanks

Is the delegate null on onPostExecute? Because if not then it's working as intended. — Pedro Oliveira, Sep 10 '14 at 08:52
[Same exact question answered here](http://stackoverflow.com/a/25759586/2964379). Mahdi, please understand that *return MainResult;* **runs before** *MainResult = output;* and therefore call(...) will always return null, no matter what you do. — 0101100101, Sep 10 '14 at 13:36
And both questions are actually reposts of [this one](http://stackoverflow.com/questions/25758236/android-asynctask-dont-return-correct-result). — 0101100101, Sep 10 '14 at 14:29

Devendra · Answer 1 · 2014-09-10T09:11:03.253

0

There you are implementing AsyncResponce. so Replace

new ProcessTask(rq, new AsyncResponse() {
            @Override
            public void processFinish(String output) {
                MainResult = output;
            }
        }).execute();

By

new ProcessTask(rq, this).execute();

Then your class overrided method processFinish(String output) will call.

And use your value at processFinish() rather than value retured by call( ) method.

edited Sep 10 '14 at 09:11

answered Sep 10 '14 at 08:54

Devendra

19
1
1
7

do not resolve problem for `new ProcessTask(rq, this).execute();return MainResult;` with this implemented method `@Override public void processFinish(String output) { MainResult = output; }` – Mahdi Pishguy Sep 10 '14 at 09:02
R u debugged your code is there any Exception? – Devendra Sep 10 '14 at 09:06
yes. thats return null – Mahdi Pishguy Sep 10 '14 at 09:07
There you are returning value from your call(...) method. Please use value on processFinished(). – Devendra Sep 10 '14 at 09:08
my problem don't resolve and `call` method must return. can you paste correct code to post? – Mahdi Pishguy Sep 10 '14 at 09:14
1

It's AsyncTask functionality you can't return it with call method. – Devendra Sep 10 '14 at 09:17
i know it i'm using `AsyncResponse` as an Interface to get result and pass data from `call` method. – Mahdi Pishguy Sep 10 '14 at 09:19
can you help me to get value from Interface and return value from it? my post **updated** – Mahdi Pishguy Sep 10 '14 at 09:42

score 0 · Answer 2 · answered Sep 10 '14 at 09:04

0

ProcessTask is an async task, so when u invoke callmethod, u will get null when return MainResult, becz it has not been set by processFinishmethod yet.

answered Sep 10 '14 at 09:04

Euporie

1,896
1
21
23

Android return value from processFinish in AsyncTask

2 Answers2