How to parse data from 2 different URLs by asyncTask method

Question

I have an app that get data from a JSON URL. It works perfectly with one URL, but I need to get data from two JSON URLs at the same time. Like some data from one URL and som

Answer 1

Variant A) You could execute your GetJSONTask like this:

new GetJSONTask().execute(url1, url2);

And access the URLs in your AsyncTask like this:

 class GetJSONTask extends AsyncTask<String, Void, JSONObject[]> {
     ...
     JSONObject[] doInBackground(String... urls) {

         // Getting JSON from URL
        JSONObject json1 = jParser.getJSONFromUrl(urls[1]);
        JSONObject json2 = jParser.getJSONFromUrl(url2[2]);

        return new JSONObject[] {json1, json2};
    }

    void onPostExecute(JSONObject[] jsons) { ... }

}

Variant B) If you want to make the process running truly parallel, you could add another AsyncTask which creates 2 child Tasks and waits for their result. On most devices, this will half the time required to perform that task.

class GetTwoJsonsTask extends AsyncTask<String, Void, JSONObject[]> {
    JSONObject[] doInBackground(urls) {

        task1 = new GetJSONTask().execute(urls[1]);
        task2 = new GetJSONTask().execute(urls[2]);

        // block until sub-tasks are finished
        JSONObject json1 = task1.get();
        JSONObject json2 = task2.get();

        return new JSONObject[] {json1, json2};
    }

    void onPostExecute(JSONObject[] jsons) { ... }

}

Answer 2

that's how i did it, it's in easy way to do it

public class GetSetting extends AsyncTask<List<String>,Void,List<String>> {

    String urls[] =  new String[]{"http:// first url",
                              "http:// second url"};


    @Override
    protected ArrayList<String> doInBackground(List<String>... lists) {

        HttpURLConnection urlConnection;
        InputStream inputStream;
        BufferedReader bufferedReader;
        URL urlIfSup;
        ArrayList<String> result = new ArrayList<>();
        try {

            // here to connect and get a different type of data  

            for (int i = 0; i < 2; i++){ // this one for connect the url from url array in every loop 

                urlIfSup = new URL(urls[i]);
                urlConnection = (HttpURLConnection) urlIfSup.openConnection();
                inputStream = urlConnection.getInputStream();
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"utf-8"));

                String data = bufferedReader.readLine();

                while(bufferedReader.readLine() != null){

                    data += bufferedReader.readLine();
                }
                if (i==0) {

                    // do something for the first url

                }else if (i==1){

                  // do something for the second url
                   // use jSON if you want 


                  // then do this at the last url       
                    urlConnection.disconnect();
                    inputStream.close();
                    bufferedReader.close();
                }
            }

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


        return result;
    }
}

Answer 3

I suggest you to change your method to

class GetJSONTask extends AsyncTask<String, Void, JSONObject[]> {

 ...

 protected JSONObject[] doInBackground(String... urls) {
    // Creating new JSON Parser
    JSONParser jParser = new JSONParser();

    // Getting JSON from URL
    JSONObject[] jsons = new JSONObject[2];
    jsons[0] = jParser.getJSONFromUrl(url1);
    jsons[1] = jParser.getJSONFromUrl(url2);

    return jsons;
}
protected void onPostExecute(JSONObject[] jsons) {
    JSONObject json1 = jsons[0];
    JSONObject json2 = jsons[1];
    // do you work after this
}
}

hope this help!