how to stop asyncTask android

Question

In my android project I use many AsynTask in one activity. I need to stop one AsynTask when I start other.

I'm using myAsynTask.cancel(true); in my android project. But it does stop the AsynTask.

protected String doInBackground(String... args) {

        HashMap<String, String> params = new HashMap<>();
        params.put("id", args[0]);

        Log.d("get value: ", params.toString());

        JSONObject json = jParser.makeHttpRequest(url_comment, "GET", params);

        Log.d("All matches: ", json.toString());

        if(isCancelled()) {
            finish();
        }
        else {

            try {

                int success = json.getInt(TAG_SUCCESS);
                if (success == 1) {

                    JSONmatches = json.getJSONArray(TAG_vedio);

                    for (int i = 0; i < JSONmatches.length(); i++) {
                        JSONObject c = JSONmatches.getJSONObject(i);

                        String title = c.getString(TAG_title);
                        String url = c.getString(TAG_url);

                        HashMap<String, String> map = new HashMap<String, String>();

                        map.put(TAG_title, title);
                        map.put(TAG_url, url);

                        arrayList22.add(map);
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

In this case, you should use a library for webservice requests. For example retrofit is the best choice for this job. the link of it : square.github.io/retrofit. It arranges and supports multi requests. — hkaraoglu
– hkaraoglu, Commented Apr 7, 2016 at 11:30

F43nd1r · Accepted Answer · 2016-04-07 11:30:20Z

1

You actively have to check for isCancelled while executing your loop in doInBackground.

You should break the loop if isCanceled is true.

answered Apr 7, 2016 at 11:30

F43nd1r

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F43nd1r · Accepted Answer · 2016-04-07 12:59:48Z

1

From the official Android documentation:

A task can be cancelled at any time by invoking cancel(boolean). Invoking this method will cause subsequent calls to isCancelled() to return true. After invoking this method, onCancelled(Object), instead of onPostExecute(Object) will be invoked after doInBackground(Object[]) returns. To ensure that a task is cancelled as quickly as possible, you should always check the return value of isCancelled() periodically from doInBackground(Object[]), if possible (inside a loop for instance.)

edited Apr 7, 2016 at 12:59

F43nd1r

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answered Apr 7, 2016 at 11:36

Ravi Theja

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3 Comments

Hussain Eid Over a year ago

it is invoke isCancelled() first but it also invoke onPostExecute(Object) after isCancelled() runs.

Ravi Theja Over a year ago

check the the isCancelled() value and if it is false then continue your work in postExecute()

Hussain Eid Over a year ago

if (isCancelled()) {                 this.cancel(true);             }             else{                                     listView.setVisibility(View.GONE);                                                }

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